@phdthesis{Scheffler2019, author = {Scheffler, Thomas}, title = {Werkstoffeinfl{\"u}sse auf den Spritzgussprozess von hochgef{\"u}llten Phenol-Formaldehydharz­ Formmassen}, school = {Technische Hochschule Rosenheim}, year = {2019}, abstract = {Im Rahmen der vorliegenden Arbeit wurden verschiedene duroplastische Formmassen laboranalytisch hinsichtlich der rheologischen und thermischen Eigenschaften untersucht. Es wurde u.a. gezielt die absolute Materialfeuchte gesteigert, um den Einfluss dieser auf das Fließ­ H{\"a}rtungsverhalten zu charakterisieren. Anschließend wurden die Materialien auf einer hochinstrumentierten Spritzgussmaschine mit einem Fließspiralenwerkzeug untersucht. Dabei konnte ein direkter Zusammenhang zwischen dem R{\"u}ckfluss und dem Plastifizierdrehmoment in Abh{\"a}ngigkeit der Materialfeuchte und der Prozessparameter detektiert werden . Des Weiteren wurden {\"u}ber die Differenzdruckmessung im Fließspiralenwerkzeug die scheinbaren Viskosit{\"a}ten {\"u}ber den Fließweg ermittelt. Hierbei konnten unterschiedliche Aufschmelzeffekte {\"u}ber die Fließwegl{\"a}nge in Abh{\"a}ngigke it der duroplastischen Formmasse, der absoluten Materialfeuchte und der Prozessparameter detektiert werden . Durch Schererw{\"a}rmung konnte die Formmassentemperatur teilweise die Werkzeugtemperatur {\"u}bersteigen. Hinsichtlich der mechanischen Eigenschaften (Schlagz{\"a}higkeit, Biegefestigkeit) konnten keine signifikanten Einflussgr{\"o}ßen detektiert werden. Hinsichtlich des Tg konnten systematischen Unterschiede detektiert und begr{\"u}ndet werden. Die beste M{\"o}glichkeit zur Ermittlung des Tg lieferte die TMA. Die thermischen Glas{\"u}berg{\"a}nge korrelieren mit den in der DSC ermittelten Aush{\"a}rtegraden , wobei mit steigender Materialfeuchte ein geringer Aush{\"a}rtegrad detektiert wird.}, language = {de} } @article{HartmannBarthKarlingeretal.2016, author = {Hartmann, M. and Barth, S. and Karlinger, Peter and Schemme, Markus and Michanickl, Andreas}, title = {Zusammen maßnehmen}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {7/2016}, year = {2016}, language = {de} } @article{ZillmerKarlingerZentgrafetal.2016, author = {Zillmer, M. and Karlinger, Peter and Zentgraf, Peter and W{\"u}rtele, M. and Grimm, G. and Wolf, W.}, title = {Vorausschauende Zylindertemperierung}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {10/2016}, year = {2016}, language = {de} } @inproceedings{RagaiSchwabenbauerEseretal.2018, author = {Ragai, and Schwabenbauer, and Eser, and M{\"u}ller,}, title = {Effect of Process Parameters on the Electrically-Assisted Sintered Iron-Copper Powder Metals}, series = {ASME 2018 International Mechanical Engineering Congress and Exposition}, booktitle = {ASME 2018 International Mechanical Engineering Congress and Exposition}, editor = {ASME,}, isbn = {978-0-7918-5201-9}, doi = {10.1115/IMECE2018-86891}, pages = {5}, year = {2018}, abstract = {Electric-current-assisted sintering (ECAS) is a novel process that can potentially replace the conventional sintering method. It is hypothesized that the process can reduce the sintering time and can be used in situ; thus, can be more cost effective. The purpose of this research is to investigate the effect of direct current on the sintered properties of iron-copper powder metal. Experiments were conducted at various conditions to determine the optimal process parameters for this particular powder metal. The parameters investigated were electric current levels and energizing time. Experiments also included sintering the powder using a conventional furnace. Samples from both types of experiments were compared to determine the metallurgical differences due to the sintering process. Mechanical and microstructure examination were conducted to aid in determining the feasibility of ECAS.}, language = {en} } @inproceedings{WohlschlaegerVersen2019, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin}, title = {Bestimmung einer Quanteneffizienz f{\"u}r das automatisierte Sortieren von Kunststoffen durch Fluoreszenz}, series = {AALE 2019 - Autonome und intelligente Systeme in der Automatisierungstechnik 16. Fachkonferenz}, booktitle = {AALE 2019 - Autonome und intelligente Systeme in der Automatisierungstechnik 16. Fachkonferenz}, editor = {Bauer, Benedict and Wittenberg, Carsten}, publisher = {VDE Verlag}, address = {Berlin}, isbn = {978-3-8007-4860-0}, pages = {179 -- 187}, year = {2019}, language = {de} } @inproceedings{KneisslVersen2019, author = {Kneißl, M. and Versen, Martin}, title = {Erh{\"o}hung der Bandbreite eines Stromregelkreises durch Hadamard-Modulation}, series = {AALE 2019 - Autonome und intelligente Systeme in der Automatisierungstechnik 16. Fachkonferenz}, booktitle = {AALE 2019 - Autonome und intelligente Systeme in der Automatisierungstechnik 16. Fachkonferenz}, editor = {Bauer, Benedict and Wittenberg, Carsten}, publisher = {VDE Verlag}, address = {Berlin}, isbn = {978-3-8007-4860-0}, pages = {277 -- 285}, year = {2019}, language = {de} } @inproceedings{WohlschlaegerVersen2019, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin}, title = {Detektion von Kunststoffen in Wasser mithilfe von Fluoreszenz}, series = {20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019}, booktitle = {20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019}, publisher = {AMA Service GmbH}, address = {Wunstorf}, isbn = {978-3-9819376-0-2}, pages = {687 -- 694}, year = {2019}, abstract = {Die wohl gr{\"o}ßte aktuelle Umweltverschmutzung mit Kunststoffen findet in Ozeanen, Seen und Fl{\"u}ssen statt. Bis jetzt gibt es kein etabliertes Verfahren, mit dem Kunststoffe in Umwelt- bzw. Wassermatrizen detektiert werden k{\"o}nnen. Deshalb wird mit einem Verfahren, welches auf dem Prinzip der Fluoreszenz basiert, untersucht, ob unter Laborbedingungen Kunststoffe in Wasser detektiert und identifiziert werden k{\"o}nnen. Anhand eines mathematischen Modells, einer Simulation und mit Hilfe von optischen Experimenten wird gezeigt, dass der Nachweis und auch eine Identifikation von Kunststoffen in Abh{\"a}ngigkeit der Wassertiefe, mit diesem Verfahren m{\"o}glich ist.}, language = {de} } @incollection{Versen2019, author = {Versen, Martin}, title = {DRAM Failure Analysis and Defect Localization Techniques}, series = {Microelectronics Failure Analysis, Desk Reference}, booktitle = {Microelectronics Failure Analysis, Desk Reference}, editor = {Gandhi, Tejinder}, edition = {Seventh Edition}, publisher = {ASM International}, address = {Ohio}, isbn = {978-1-62708-247-1}, publisher = {Technische Hochschule Rosenheim}, pages = {499 -- 505}, year = {2019}, language = {en} } @article{HummelSchemmeKarlinger2019, author = {Hummel, Sabine and Schemme, Micheal and Karlinger, Peter}, title = {GmbH - Glasfaserhybride mit bester Haftung: Variotherme Temperierung f{\"u}r Organobleche}, series = {Plastverarbeiter}, volume = {07/2019}, journal = {Plastverarbeiter}, number = {07}, publisher = {H{\"u}thig GmbH}, address = {Heidelberg}, pages = {2}, year = {2019}, abstract = {Durch Integrieren der Variothermie k{\"o}nnen Organobleche wirtschaftlich und technisch verbessert zu Hybridbauteilen verarbeitet werden. Somit steigert sich der Wettbewerbsvorteil gegen{\"u}ber konventionellen Werkstoffen weiter. An einer Technische Hochschule wird seit mehr als zehn Jahren intensiv an der Thematik der Verbindungstechnologien sowie den Haftungsmechanismen zwischen endlosfaserverst{\"a}rkten Thermoplasten, den sogenannten Organoblechen, und angespritzten Funktionsstrukturen geforscht. Im Fokus stehen prozesstechnische Einfl{\"u}sse, die die Verbundhaftung der Hybridleichtbaustrukturen erh{\"o}hen.}, language = {de} } @inproceedings{SchemmeDittmarKarlingeretal.2019, author = {Schemme, Michael and Dittmar, Harri and Karlinger, Peter and Hummel, Sabine}, title = {Closed-Loop-Recycling - Strategien f{\"u}r endlosfaserverst{\"a}rkte thermoplastische Hybridstrukturen (Vortrag)}, series = {FOREL Kolloquium}, booktitle = {FOREL Kolloquium}, year = {2019}, language = {de} } @inproceedings{WohlschlaegerVersenLanghals2019, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin and Langhals, H.}, title = {A method for sorting of plastics with an apparatus specific quantum efficiency approach}, series = {2019 IEEE Sensors Applications Symposium (SAS)}, booktitle = {2019 IEEE Sensors Applications Symposium (SAS)}, year = {2019}, abstract = {Today, the automatic separation of polymers from each other in an industrial scale is an unsolved problem. In laboratory environments, two methods are known whereby plastic is sorted either by color or by fluorescence decay time measurements that require fast synchronization and thus expensive equipment. A simple and pragmatic process is proposed to separate plastics from each other: all fluorescent photons are counted in relation to the absorbed photons. A theoretical model and an experimental setup are built in order to determine an apparatus specific quantum efficiency.}, language = {en} } @phdthesis{Stubenrauch2019, author = {Stubenrauch, Franz J.}, title = {Halbleiter großer Bandl{\"u}ckenenergie in Stromrichtern mit Spannungszwischenkreis zur Ansteuerung dynamischer Servoantriebe}, school = {Technische Hochschule Rosenheim}, pages = {219}, year = {2019}, abstract = {Die vorliegende Arbeit untersucht den Einsatz von Halbleitern großer Bandl{\"u}ckenenergie, wie Siliziumkarbid und Galliumnitrid, in Stromrichtern der Antriebstechnik. Diese Halbleiter weisen im Vergleich zu bipolaren IGBTs geringere Schaltverluste auf, wodurch die Schaltfrequenz deutlich erh{\"o}ht werden kann. Das erm{\"o}glicht den Einsatz von Motorfiltern kompakter Bauform und geringen Kosten. Als Ergebnis erh{\"a}lt man einen Stromrichter mit hoher Stromreglerbandbreite und nahezu ideal sinusf{\"o}rmigen Ausgangsspannungen mit geringen Signalverzerrungen.}, language = {de} } @phdthesis{Wittmann2019, author = {Wittmann, Josef}, title = {Beschleunigungsregelung von Servoantrieben basierend auf Positionsmesswerten}, school = {Technische Hochschule Rosenheim}, pages = {231}, year = {2019}, abstract = {In der vorliegenden Arbeit wird der Einfluss einer Beschleunigungsregelung auf das Regelverhalten von Servoantrieben untersucht. Auf einen Beschleunigungssensor wird verzichtet. Die Istbeschleunigung wird aus dem Positionsmesswert berechnet. Anhand eines verifizierten Modells f{\"u}r Positionsmessfehler wird der Einfluss der Positionsaufl{\"o}sung und der Messsignalqualit{\"a}t auf die berechnete Beschleunigung dargestellt. Basierend auf diesen Ergebnissen wird das Konzept einer kombinierten Strom- und Beschleunigungsregelung entwickelt und dessen Funktionalit{\"a}t nachgewiesen.}, language = {de} } @techreport{Karlinger2014, author = {Karlinger, Peter}, title = {Prozessoptimierung und Energieeffizienz: Forschung an Reinr{\"a}umen in der Kunststoffproduktion}, year = {2014}, language = {de} } @inproceedings{Karlinger2014, author = {Karlinger, Peter}, title = {Kunststoffe f{\"u}r Produkte in Reinraumanwendungen}, series = {17. Expertentage - Innovationen}, booktitle = {17. Expertentage - Innovationen}, year = {2014}, language = {de} } @inproceedings{KarlingerDittelBuerkle2015, author = {Karlinger, Peter and Dittel, G. and B{\"u}rkle, E.}, title = {Benedigtbeuerer Reinraumtage}, series = {Benedigtbeuerer Reinraumtage, Tagungshandb{\"u}cher, 2002 - 2015.}, booktitle = {Benedigtbeuerer Reinraumtage, Tagungshandb{\"u}cher, 2002 - 2015.}, year = {2015}, language = {de} } @incollection{Karlinger2006, author = {Karlinger, Peter}, title = {Werkzeugkonstruktion}, series = {: Werkzeugbau in der Kunststoffverarbeitung}, booktitle = {: Werkzeugbau in der Kunststoffverarbeitung}, publisher = {Carl Hanser Verlag}, address = {M{\"u}nchen}, publisher = {Technische Hochschule Rosenheim}, year = {2006}, language = {de} } @misc{Karlinger2008, author = {Karlinger, Peter}, title = {Spritzgießmaschinen und Spritzgießen}, editor = {Karlinger, Peter}, year = {2008}, language = {de} } @inproceedings{Karlinger2013, author = {Karlinger, Peter}, title = {Kunststoff-Fertigung unter quasi Reinraumbedingungen, eine Produktionsumgebung f{\"u}r aktuelle und neue Technologien Bitte partikelfrei!}, series = {Technische Sauberkeit in der Kunststoff-Fertigung}, booktitle = {Technische Sauberkeit in der Kunststoff-Fertigung}, year = {2013}, language = {de} } @inproceedings{EbenKarlingerGehde2013, author = {Eben, J. and Karlinger, Peter and Gehde, M.}, title = {"Bitte nicht St{\"o}ren" - Analyse des St{\"o}rgr{\"o}ßeneinflusses auf Prozess und Qualit{\"a}t}, series = {23. Fachtagung TECHNOMER 2013 14./15. November 2013}, booktitle = {23. Fachtagung TECHNOMER 2013 14./15. November 2013}, year = {2013}, language = {de} } @techreport{Karlinger2014, type = {Working Paper}, author = {Karlinger, Peter}, title = {Kunststoff-Fertigung unter quasi Reinraumbedingungen Vortrag zum Clustertreffen Medizintechnik.}, series = {Clustertreffen Medizintechnik}, journal = {Clustertreffen Medizintechnik}, year = {2014}, language = {de} } @inproceedings{SpaethKarlinger2017, author = {Sp{\"a}th, Michael and Karlinger, Peter}, title = {Optimierungspotenziale beim Spritzgießen durch Prozess{\"u}berwachung und moderne Regelmethoden}, series = {Spritzgießertagung Baden-Baden}, booktitle = {Spritzgießertagung Baden-Baden}, year = {2017}, language = {de} } @article{Karlinger2014, author = {Karlinger, Peter}, title = {R{\"u}ckblick auf die Benediktbeurer Reinraumtage 2014 Schriftliches Interview}, series = {Cleanroom Magazin}, journal = {Cleanroom Magazin}, number = {2/2014}, year = {2014}, language = {de} } @inproceedings{Karlinger2014, author = {Karlinger, Peter}, title = {Einfluss der Verarbeitung auf die Bauteilqualit{\"a}t}, series = {4. VDI-Fachkonferenz Kunststoffe in optischen Systemen}, booktitle = {4. VDI-Fachkonferenz Kunststoffe in optischen Systemen}, year = {2014}, language = {de} } @article{HartmannKarlingerWuertele2015, author = {Hartmann, Markus and Karlinger, Peter and W{\"u}rtele, Martin}, title = {Optimieren durch Simulieren}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {11/2015}, publisher = {Carl Hanser Verlag}, year = {2015}, language = {de} } @book{KarlingerBuerkleWobbe2013, author = {Karlinger, Peter and B{\"u}rkle, and Wobbe,}, title = {Reinraumtechnik in der Kunststoffverarbeitung}, publisher = {Carl Hanser Verlag}, address = {M{\"u}nchen}, isbn = {ISBN 978-3-446-43,428-8}, publisher = {Technische Hochschule Rosenheim}, year = {2013}, language = {de} } @techreport{SchemmeMichanicklKarlinger2017, author = {Schemme, M. and Michanickl, A. and Karlinger, Peter}, title = {Kompetenz-Zentrum Holz-Kunststoff, Partnering-Veranstaltung f{\"u}r Holz- und biobasierte Werkstoffe und Verbundwerkstoffe}, year = {2017}, language = {de} } @inproceedings{SchefflerGehdeSpaethetal.2017, author = {Scheffler, T. and Gehde, M. and Sp{\"a}th, M. and Karlinger, Peter}, title = {Determination of the flow and curing behavior of highly filled phenolic injection molding compounds by means of spiral mold}, series = {PPS Chemnitz}, booktitle = {PPS Chemnitz}, year = {2017}, language = {en} } @article{KarlingerSchwachulla2017, author = {Karlinger, Peter and Schwachulla, T.}, title = {Multifunktionale Naturfaser-Kunststoff-Composites}, series = {Firmenzeitschrift Motan}, journal = {Firmenzeitschrift Motan}, number = {4.Quartal 2017}, year = {2017}, language = {de} } @inproceedings{SpaethZillmerKarlingeretal.2017, author = {Sp{\"a}th, Michael and Zillmer, Markus and Karlinger, Peter and Schemme, Michael and Gehde, Michael}, title = {Einfluss des zeitabh{\"a}ngigen Materialzustands beim Spritzgießen von rieself{\"a}higen, duromeren Formmassen auf den Prozess und die Bauteileigenschaften}, series = {Technomer Chemnitz}, booktitle = {Technomer Chemnitz}, year = {2017}, language = {de} } @article{KarlingerSchadhauserMartinetal.2017, author = {Karlinger, Peter and Schadhauser, M. and Martin, J. and W{\"u}rtele, M. and Modler, N.}, title = {Homogenit{\"a}t ist der Schl{\"u}ssel}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {9/2017}, year = {2017}, language = {de} } @techreport{KarlingerMercadoColmeneroRubioParamioetal.2017, author = {Karlinger, Peter and Mercado-Colmenero, Jorge Manuel and Rubio-Paramio, Miguel Angel and Martin-Do{\~n}ate, Cristina}, title = {A new procedure for calculating cycle time in injection molding based on plastic part geometry recognition}, year = {2017}, language = {en} } @inproceedings{SchemmeMichanicklKarlinger2015, author = {Schemme, Markus and Michanickl, Andreas and Karlinger, Peter}, title = {Neue Naturfaser - Kunststoffverfahren und - werkstoffe f{\"u}r den Fahrzeug-, Holz- und M{\"o}belbau}, series = {2. Kooperationsforum „Holz als neuer Werkstoff" Regensburg}, booktitle = {2. Kooperationsforum „Holz als neuer Werkstoff" Regensburg}, year = {2015}, language = {de} } @inproceedings{Karlinger2016, author = {Karlinger, Peter}, title = {Internationales Kunststoffsymposium S{\~a}o Paulo MODERA{\c{C}}{\~A}O}, series = {Vis{\~a}o Geral - 4.0 Aktueller Stand und Entwicklung}, booktitle = {Vis{\~a}o Geral - 4.0 Aktueller Stand und Entwicklung}, year = {2016}, language = {de} } @article{KarlingerHartmannBarthetal.2016, author = {Karlinger, Peter and Hartmann, Markus and Barth, Simon and Schemme, Michael and Michanickl, Andreas}, title = {Holzoberfl{\"a}chen an Kunststoffteilen}, series = {Zeitschrift Kunststoffe}, journal = {Zeitschrift Kunststoffe}, year = {2016}, language = {de} } @article{KarlingerZillmerZentgrafetal.2016, author = {Karlinger, Peter and Zillmer, Markus and Zentgraf, Peter and W{\"u}rtele, Martin and Grimm, G{\"u}nther}, title = {Neue Regler f{\"u}r Plastizfierungen an Spritzgießmaschinen}, series = {Zeitschrift Kunststoffe}, journal = {Zeitschrift Kunststoffe}, year = {2016}, language = {de} } @article{KarlingerBarthHartmannetal.2016, author = {Karlinger, Peter and Barth, Simon and Hartmann, Markus and Michanickl, Andreas and Schemme, Michael}, title = {Einen Bund eingehen}, series = {Bauen mit Holz}, journal = {Bauen mit Holz}, year = {2016}, language = {de} } @inproceedings{VersenKipfelsberger2014, author = {Versen, Martin and Kipfelsberger, S.}, title = {Introduction to microcomputer technology with the MSP430 Launch Pad in remote labs}, series = {Global Engineering Education Conference (EDUCON), 2014 IEEE}, booktitle = {Global Engineering Education Conference (EDUCON), 2014 IEEE}, year = {2014}, abstract = {Texas Instruments' MSP430 Launch Pad is used as a key component for remote labs that complement an introduction course to microcomputer technology in the bachelor program Mechatronic at the University of Applied Sciences in Rosenheim. The remote labs use breakout boards and include a timer experiment with generation of pulse width modulation signals, I2C communication and analog to digital conversion.}, language = {en} } @inproceedings{VersenBernhardtHeigletal.2012, author = {Versen, Martin and Bernhardt, and Heigl, M. and Viehhauser, P. and Zentgraf, P.}, title = {System for real-time data acquisition and processing on a hail-fighter aeroplane}, series = {Proceedings of the 5th European DSP Education and Research Conference}, booktitle = {Proceedings of the 5th European DSP Education and Research Conference}, year = {2012}, abstract = {The System HAILsens implements a device for Real-Time sensor data processing, running on a Texas Instruments Concerto M3 core. An I2C interface is used for sensor communications. Ethernet with UDP on a custom developed three layered frame organisation of sensor data serves as a link to the main system on board of an aeroplane. For backing up the acquired data, all frames are locally stored on an SD Card. To have the possibility of easily checking the current system status, an LCD module and a push-button provide a minimal user interface.}, language = {en} } @incollection{Versen2011, author = {Versen, Martin}, title = {DRAM Failure Analysis and Defect Localization Techniques, Microelectronics Failure Analysis}, series = {Desk Reference Sixth Edition}, booktitle = {Desk Reference Sixth Edition}, publisher = {ASM International}, address = {Ohio}, publisher = {Technische Hochschule Rosenheim}, year = {2011}, abstract = {Comprehensive guide to the process and test methods used for electronic device failure analysis. Contains dozens of articles—contributed by industry experts—covering a wide range of topics involving the failure analysis of microelectronics. It places the most important and up-to-date information on this subject at your fingertips.  Topic coverage includes:  Failure Analysis Process Flow Failure Verification  Failure Modes and Failure Classification  Special Devices (MEMS, Optoelectronics, Passives)  Fault Localization Techniques: Package Level (NDT)  Die Level (Depackaging, Photon Emission, Microthermography, Laser-Based Methods, Particle Beam Methods)  Deprocessing \& Imaging Techniques: Deprocessing  General Imaging Techniques  Local Deprocessing \& Imaging  Circuit Edit and Design Modification  Material Analysis Techniques  Reference Information: Important Topics for Semiconductor Devices  Failure Analysis Techniques Roadmap  Failure Analysis Operations and Management  Appendices: Failure Analysis Terms, Definitions, and Acronyms  Industry Standards}, language = {en} } @inproceedings{VersenShankarEnimidisettyetal.2011, author = {Versen, Martin and Shankar, S. and Enimidisetty, S. and Bernhardt, A. and Srinivasan, B.}, title = {Setup for Locating PV-Cell Surface Defects Through ISC Measurements}, series = {Proceedings of the 37th ISTFA 2011}, booktitle = {Proceedings of the 37th ISTFA 2011}, year = {2011}, language = {en} } @inproceedings{Versen2011, author = {Versen, Martin}, title = {Worst Case Test Conditions for Defect Localization in DRAM Devices}, series = {Microelectronics Seminar of the ISTFA 2011}, booktitle = {Microelectronics Seminar of the ISTFA 2011}, year = {2011}, language = {en} } @inproceedings{WittmannHagl2016, author = {Wittmann, Josef and Hagl, Rainer}, title = {Gleichlaufschwankungen in Servoantrieben}, series = {Fortschritte in der Antriebs- und Automatisierungstechnik (FAA), Stuttgart}, booktitle = {Fortschritte in der Antriebs- und Automatisierungstechnik (FAA), Stuttgart}, year = {2016}, language = {de} } @inproceedings{WittmannHaglKennel2016, author = {Wittmann, Josef and Hagl, Rainer and Kennel, Ralph}, title = {Influence of Position Measuring Errors on Speed Ripple in Servo Drives}, series = {2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM, Capri, Italy}, booktitle = {2016 International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM, Capri, Italy}, year = {2016}, abstract = {Position measuring devices with sinusoidal measuring signals are widely used in position-controlled servo drives in industrial automation, e.g., for machine tools or semiconductor production machines. Usually, the feedback signal for the speed or velocity controller is calculated from the measured position. Therefore, position measuring errors affect these control loops. This study presents an analytic error model that considers non-ideal sinusoidal measuring signals with basic deviations (amplitude differences, offset errors, and phase shift) as well as signal harmonics. The model was used to systematically investigate the influence of signal quality and the number of signal periods from position measuring devices on speed ripple, across a wide range of speeds. A test stand with a high-resolution reference angle measuring device was used to confirm the results.}, language = {en} } @inproceedings{WittmannHaglKennel2017, author = {Wittmann, Josef and Hagl, Rainer and Kennel, Ralph}, title = {Hybrid Current and Acceleration Control of Servo Drives}, series = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, booktitle = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, year = {2017}, abstract = {A hybrid current and acceleration control is presented and shown to improve the load disturbance behavior of servo drives significantly without additional sensor effort. The feedback signal of the acceleration control loop is calculated from the position data of the motor encoder. Hence, position measuring errors influence this control loop and lead to speed ripple. Therefore, the presented design of the acceleration control loop considers both load sensitivity and position measuring errors.}, language = {en} } @inproceedings{HoellthalerHagl2017, author = {H{\"o}llthaler, Julia and Hagl, Rainer}, title = {Plattformunabh{\"a}ngige modellbasierte Entwicklung von hochdynamischen Antriebsregelungen}, series = {MATLAB EXPO 2017 Deutschland, M{\"u}nchen, 27. Juni 2017}, booktitle = {MATLAB EXPO 2017 Deutschland, M{\"u}nchen, 27. Juni 2017}, year = {2017}, language = {de} } @inproceedings{StubenrauchWittmannKiermayeretal.2017, author = {Stubenrauch, Franz and Wittmann, Josef and Kiermayer, Alexander and Seliger, Norbert and Hagl, Rainer and Schmitt-Landsiedel, Doris and Kennel, Ralph}, title = {FPGA-based High Dynamic Servo Drive Control with a 200kHz Gallium Nitride Inverter}, series = {2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe), Warsaw, Poland}, booktitle = {2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe), Warsaw, Poland}, year = {2017}, abstract = {Increased productivity in industrial processes can be achieved by dynamic and accurate positioning of servo drives. Therefore, improvement of servo drive dynamics using latest technologies in the key components such as inverter, control system and position measuring device are investigated. Using Gallium Nitride (GaN) or Silicon Carbide (SiC) semiconductors for motor inverters enables energy efficient operation up to pulse width modulation (PWM) frequencies of 500 kHz. This allows motor filters with small component sizes. As a result, high motor efficiency, low torque ripple, high control bandwidth and almost ideal sinusoidal output voltages are achieved. Experiments on a 200 kHz Gallium Nitride inverter with sine wave motor filter show a current control loop bandwidth of 3.2 kHz and almost ideal sinusoidal phase voltages. The achieved bandwidths of the speed and position control loops are 318 Hz and 106 Hz, respectively.}, language = {en} } @inproceedings{VersenTreichlKalteneckeretal.2018, author = {Versen, Martin and Treichl, R. and Kaltenecker, M. and El Shahawy, H. and Thomas, T. T.}, title = {Differentielle LVDS Schnittstelle f{\"u}r modellbasierte Entw{\"u}rfe mit MathWorks HDL Coder}, series = {15. AALE Konferenz zu Cyberphysischen Produktionssystemen, 2018}, booktitle = {15. AALE Konferenz zu Cyberphysischen Produktionssystemen, 2018}, publisher = {VDE-Verlag}, address = {Berlin}, isbn = {978-3-8007-4522-7}, year = {2018}, language = {de} } @article{VersenErnstGulati2017, author = {Versen, Martin and Ernst, W. and Gulati, P.}, title = {A row hammer pattern analysis of DDR2 SDRAM}, series = {Microelectronics Reliability}, volume = {76-77}, journal = {Microelectronics Reliability}, pages = {64 -- 67}, year = {2017}, abstract = {A DDR2 SDRAM test setup implemented on the Griffin III ATE test system from HILEVEL Technologies is used to analyse the row hammer bug. Row hammer pattern experiments are compared to standard retention tests. The analysis confirms that the row hammer effect is caused by a charge excitation process depending on the number of stress activation cycles. The stress has to occur in the local neighborhood of the cells under test. Shallow impurity levels support the responsible charge carrier transport process in the used DDR2 SDRAM technology}, language = {en} } @inproceedings{VersenKipfelsbergerSoekmen2016, author = {Versen, Martin and Kipfelsberger, F. and Soekmen, F.}, title = {Model-Based Reference Design Projects with MathWorks' HDL Workflow Advisor for Custom-Specific Electronics with the Zedboard}, series = {ANALOG 2016; 15. ITG/GMM-Symposium, Bremen, Germany}, booktitle = {ANALOG 2016; 15. ITG/GMM-Symposium, Bremen, Germany}, year = {2016}, abstract = {Reference design projects are implemented to the Xilinx Zynq on the Zedboard which is extended by user defined electronic hardware connected through the Zedboard's FMC (FPGA Mezzanine Card) connector. The implementation method with HDL Workflow Advisor includes constraint definitions for modified reference design projects for use with digital input and outputs and Zynq's XADC (Analog-Digital converter) which is characterized and compared to its data sheet. The bandwidth of the Zynq's internal AXI (Advanced eXtensible Interface) bus connected to the Simulink host PC is determined.}, language = {en} } @article{VersenErnstGulatietal.2015, author = {Versen, Martin and Ernst, W. and Gulati, P. and Singh, G.}, title = {Test setup for reliability studies of DDR2 SDRAM}, series = {Microelectronics Reliability}, journal = {Microelectronics Reliability}, year = {2015}, abstract = {A DDR2 DRAM test setup is developed and implemented on the Griffin III ATE test system from HILEVEL Technologies. The test system provides a raw platform for performing various mixed signal and digital tests. In order to configure patterns easily in a vector format, a software platform is developed to manage test patterns according to the user's analysis needs. As examples, retention test patterns with disabled self-refresh are applied to 2 Gbit DDR2 SDRAM of two different DRAM vendors. The devices are characterized in respect to their intrinsic leakage and data retention behavior under the influence of stress conditions such as temperature or access algorithm. The tests are automated and test data is logged for an off-line data analysis. Data is recorded before and after solder simulation steps in order to observe a retention time degradation.}, language = {en} } @inproceedings{VersenHayn2014, author = {Versen, Martin and Hayn, M.}, title = {Introduction to Verification and Test Using a 4-Bit Arithmetic Logic Unit Including a Failure Module in a Xilinx XC9572XL CPLD}, series = {Proceedings of the 40th ISTFA 2014}, booktitle = {Proceedings of the 40th ISTFA 2014}, year = {2014}, language = {en} } @article{WittmannHagl2016, author = {Wittmann, Josef and Hagl, Rainer}, title = {Positionsmessfehler in Servoantrieben}, series = {Antriebstechnik}, volume = {2016}, journal = {Antriebstechnik}, number = {1-2}, year = {2016}, language = {de} } @phdthesis{Rabold2010, author = {Rabold, Andreas}, title = {Anwendung der Finite Element Methode auf die Trittschallberechnung}, school = {Technische Hochschule Rosenheim}, year = {2010}, abstract = {Die Forschung und Entwicklung im Bereich der Bauakustik erfolgt bislang schwerpunktm{\"a}ßig durch aufw{\"a}ndige messtechnische Parameterstudien. Eine wesentliche Reduzierung dieses Aufwands kann dadurch erreicht werden, dass die Bauteil-Parameterstudien nicht mehr ausschließlich durch Messungen erfolgen, sondern auch anhand von geeigneten Berechnungsmodellen durchgef{\"u}hrt werden. Dazu wurde ein umfassendes Berechnungsmodell erarbeitet und anhand von Messergebnissen validiert. Wesentliche Grundlage f{\"u}r die volumenorientierte akustische Simulation ist dabei die p-Version der Methode der Finiten Elemente. Auf Basis der numerischen Berechnungen wurden die Wechselwirkungen der Deckenkomponenten untersucht und optimierte Konstruktionen erarbeitet. Nach deren messtechnischen {\"U}berpr{\"u}fung konnten die Ergebnisse in Form von Konstruktionshilfen f{\"u}r optimierte Aufbauten zusammengestellt werden.}, language = {de} } @article{HummelKnorrKarlingeretal.2017, author = {Hummel, Sabine and Knorr, Ludwig and Karlinger, Peter and Schemme, Michael}, title = {Eine Frage der Haftung}, series = {Kunststoffe}, journal = {Kunststoffe}, number = {07/2017}, publisher = {Carl Hanser Verlag GmbH \& Co. KG}, address = {M{\"u}nchen}, year = {2017}, abstract = {Dieser Artikel gibt ein Einblick in Hinblick auf die Verarbeitung von endlosverst{\"a}rkten Faserhalbzeuge, sogenannten Organobleche, in Kombination mit dem Spritzgießverfahren. Ein Schwerpunkt stellt die Verbundhaftung zwischen den beiden Komponenten dar. Neue Ergebnisse sollen die Gestaltungsrichtlinien der angespritzten Funktionselementen f{\"u}r derartige Bauteile f{\"u}hren. Die Verbundfestigkeit h{\"a}ngt von vielen Einflussfaktoren ab.}, language = {de} } @inproceedings{HummelSchemmeKarlinger2017, author = {Hummel, Sabine and Schemme, Michael and Karlinger, Peter}, title = {Haftungsuntersuchungen f{\"u}r Leichtbauanwendungen}, series = {Technomer 2017 - 25. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren}, booktitle = {Technomer 2017 - 25. Fachtagung {\"u}ber Verarbeitung und Anwendung von Polymeren}, year = {2017}, abstract = {Die Verst{\"a}rkung von Spritzgussteilen mit Faserhalbzeugen gewinnt immer mehr an Bedeutung. F{\"u}r die Einsatztauglichkeit derartiger Bauteile ist die Verbundhaftung zwischen den angespritzten Strukturen und den Faserhalbzeugen essentiell. Der Vortrag befasst sich mit den {\"a}ußeren und prozesstechnischen Einfl{\"u}ssen zu Erh{\"o}hung der Verbundhaftung auf Faserhalbzeugen. Zudem wird ein Einblick in die Pr{\"u}f-und Anlagentechnik in diesem Bereich gegeben.}, language = {de} } @article{SchittenhelmFischer1998, author = {Schittenhelm, Wolfgang and Fischer, K.}, title = {SEPP: ein studentisches Projekt der Elektrotechnik}, series = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, volume = {1998}, journal = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, organization = {Fachhochschule Rosenheim}, year = {1998}, language = {de} } @article{SchittenhelmKoenig2000, author = {Schittenhelm, Wolfgang and K{\"o}nig, Andreas}, title = {Studentische Projektarbeit im Labor Automatisierungstechnik}, series = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, volume = {2000}, journal = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, organization = {Fachhochschule Rosenheim}, year = {2000}, language = {de} } @article{SchittenhelmBerndt2000, author = {Schittenhelm, Wolfgang and Berndt, T.}, title = {OPC - die Schnittstelle des PC f{\"u}r die Automatisierungstechnik}, series = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, volume = {2000}, journal = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, organization = {Fachhochschule Rosenheim}, year = {2000}, language = {de} } @article{Schittenhelm2001, author = {Schittenhelm, Wolfgang}, title = {WEBROB - Ein Roboter im Internet}, series = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, volume = {2001}, journal = {Rosenheimer Hochschulhefte 1981 - 2007 (Zeitschrift der Fachhochschule Rosenheim)}, organization = {Fachhochschule Rosenheim}, year = {2001}, language = {de} } @article{PiepenbrinkSchittenhelm2003, author = {Piepenbrink, A. and Schittenhelm, Wolfgang}, title = {Pneumatiksystem im Selbstbau}, series = {Zeitschrift fluid}, journal = {Zeitschrift fluid}, number = {Nr. 9 + 10/2003}, publisher = {Verlag moderne Industrie}, address = {Landsberg am Lech}, year = {2003}, language = {de} } @inproceedings{SchittenhelmKarlingerOberauer2013, author = {Schittenhelm, Wolfgang and Karlinger, Peter and Oberauer, Josef}, title = {Energieeffiziente Regelung der L{\"u}ftung und Klimatisierung eines Reinraumes f{\"u}r die Kunststoffproduktion}, series = {Tagungsband AALE (Angewandte Automatisierungstechnik in Lehre und Entwicklung), 10. Fachkonferenz, 28. Februar - 1. M{\"a}rz 2013, Stralsund.}, booktitle = {Tagungsband AALE (Angewandte Automatisierungstechnik in Lehre und Entwicklung), 10. Fachkonferenz, 28. Februar - 1. M{\"a}rz 2013, Stralsund.}, publisher = {Deutscher Industrieverlag}, address = {M{\"u}nchen}, isbn = {978-3-8356-3364-3}, pages = {143 -- 153}, year = {2013}, language = {de} } @inproceedings{Zentgraf2017, author = {Zentgraf, Peter}, title = {ANALYTICAL ATTITUDE DETERMINATION FROM A SPECIFIC RATE PROFILE}, series = {40th ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE, Breckenridge, Colorado, USA}, booktitle = {40th ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE, Breckenridge, Colorado, USA}, year = {2017}, abstract = {The problem dealt with in this paper is the analytical determination of the attitude of a rigid body which undergoes a given rate profile. Usually the attitude is determined by solving the kinematic differential equation numerically. For long lasting movements the outcome can cost computation time plus encountered losses in accuracy, which can be disturbing especially in optimization problems. This contribution solves the kinematic differential equation for certain rate profiles exactly and compares the results in accuracy and computation time with the standard procedures.}, language = {en} } @inproceedings{ZentgrafBergeChassetetal.2010, author = {Zentgraf, Peter and Berge, S. and Chasset, C. and Filippi, H. and Gottzein, E. and Guti{\´e}rrez-Ca{\~n}as, I. and Hartrampf, M. and Krauss, P. A. and Kuehl, C. and L{\"u}bke- Ossenbeck, B. and Mittnacht, M. and Montenbruck, O. and M{\"u}ller, C. and Rueda Boldo, P. and Truffi, A.}, title = {PREPARING THE GPS-EXPERIMENT FOR THE SMALL GEO MISSION}, series = {33rd ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE}, booktitle = {33rd ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE}, editor = {American Astronautical Society,}, year = {2010}, abstract = {This paper deals with the preparation of the Small GEO mission and the accommodation of a GPS receiver as an experiment. The expected benefits of using the GPS receiver for Small GEO are explained. The feasibility of using GPS for position determination is investigated by simulation using a MosaicGNSS receiver, which was stimulated by a Spirent RF signal generator. A procedure, how to evaluate flight data on ground is outlined. Success criteria of the experiment and the minimal size of the downlink stream required and reserved for the receiver TM are presented.}, language = {en} } @misc{ZentgrafErb2009, author = {Zentgraf, Peter and Erb, S.}, title = {IMPACT OF ELECTRIC PROPULSION UNCERTAINTY ON ORBIT PREDICTION}, editor = {Zentgraf, Peter}, year = {2009}, abstract = {This paper analyses the achievable performance of the orbit prediction for a geostationary satellite using clusters of electrical propulsion (EP) thrusters for station-keeping and a star tracker based attitude control system. The challenge in the orbit prediction is that the real electrical propulsion thrust is known with limited accuracy only. In combination with thrust pointing errors, these inaccuracies can accumulate to large orbit position errors during long low thrust burn arcs. The discrepancy between real and predicted satellite position is determined in terms of probability and as a worst case scenario.}, language = {en} } @inproceedings{ZentgrafReggio2009, author = {Zentgraf, Peter and Reggio, D.}, title = {MAGNETIC RATE DAMPING FOR SATELLITES IN LEO}, series = {32nd ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE}, booktitle = {32nd ANNUAL AAS GUIDANCE AND CONTROL CONFERENCE}, year = {2009}, abstract = {This article deals with the topic of damping the rates of a satellite after separation from the launcher by sensing the rates with magnetometers or gyroscopes and actually damping it with torquerods or thrusters. In literature problems of this kind are treated by linearization which is not adequate here due to the high nonlinearity of the problem caused by the high gyroscopic torque. This paper addresses the observability and controllability of the rate dynamics for symmetric satellite bodies. Furthermore, robust stability of any bodies is investigated by means of the Krasovskii-LaSalle principle which is a variant of Ljapunov's Second Method. It is found that - apart from one exception - the system is robustly stable for certain conditions depending only on the gain matrix and not depending on the orbit, moments of inertia or initial conditions. The exception is that of the intuitive case of an equator type orbit, in which the satellite rotates around the magnetic field lines, in this case the satellite's rate cannot be damped. Several design configurations are analysed with respect to their performance and cost: Rate damping with magnetometers or gyroscopes as sensors, and torquerods and thrusters as actuators. The results are evaluated with respect to the time to reach the desired rate, the propellant and the power equivalent battery mass used. The goal is to use the results to allow an AOCS equipment and architecture trade-off at an early project phase. The design of the rate damping control of the SWARM project is presented as an example and demonstrated with simulations.}, language = {en} } @article{LazarJarre2016, author = {Lazar, Markus and Jarre, F.}, title = {Calibration by Optimization Without Using Derivatives}, series = {Optimization and Engineering}, volume = {2016}, journal = {Optimization and Engineering}, number = {17/4}, publisher = {Springer}, pages = {833 -- 860}, year = {2016}, abstract = {Applications in engineering frequently require the adjustment of certain parameters. While the mathematical laws that determine these parameters often are well understood, due to time limitations in every day industrial life, it is typically not feasible to derive an explicit computational procedure for adjusting the parameters based on some given measurement data. This paper aims at showing that in such situations, direct optimization offers a very simple approach that can be of great help. More precisely, we present a numerical implementation for the local minimization of a smooth function f:Rn→R subject to upper and lower bounds without relying on the knowledge of the derivative of f. In contrast to other direct optimization approaches the algorithm assumes that the function evaluations are fairly cheap and that the rounding errors associated with the function evaluations are small. As an illustration, this algorithm is applied to approximate the solution of a calibration problem arising from an engineering application. The algorithm uses a Quasi-Newton trust region approach adjusting the trust region radius with a line search. The line search is based on a spline function which minimizes a weighted least squares sum of the jumps in its third derivative. The approximate gradients used in the Quasi-Newton approach are computed by central finite differences. A new randomized basis approach is considered to generate finite difference approximations of the gradient which also allow for a curvature correction of the Hessian in addition to the Quasi-Newton update. These concepts are combined with an active set strategy. The implementation is public domain; numerical experiments indicate that the algorithm is well suitable for the calibration problem of measuring instruments that prompted this research. Further preliminary numerical results suggest that an approximate local minimizer of a smooth non-convex function f depending on n≤300 variables can be computed with a number of iterations that grows moderately with n.}, language = {en} } @inproceedings{StubenrauchSeligerSchmittLandsiedel2017, author = {Stubenrauch, Franz and Seliger, Norbert and Schmitt-Landsiedel, Doris}, title = {Design and Performance of a 200 kHz GaN Motor Inverter with Sine Wave Filter}, series = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, booktitle = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, pages = {9}, year = {2017}, abstract = {Gallium Nitride (GaN) semiconductor devices are promised to be a good alternative to Silicon (Si) semiconductors in future motor inverters for variable frequency drives (VFDs). They combine low on state resistance and low switching losses with a high blocking voltage capability. Compared to actual inverters based on insulated gate bipolar transistors (IGBTs) the pulse width modulation (PWM) frequency for efficient operation can be increased by a factor of 5 to 10, extending the PWM frequency range up to 500 kHz. This allows the use of motor filters with small component size. As a result, high motor efficiency, low torque ripple, high control bandwidth and nearly ideal sinusoidal output voltages are achieved. Therefore this inverters can be used for high speed spindle motors and dynamic servo drives. This paper focus on the design of a hybrid sine wave filter consisting of an analog and a digital part. The filter is optimized to achieve low power loss and high current control bandwidth. A 3-phase GaN motor inverter operating at 200 kHz PWM frequency at 400 V DC-link voltage verifies the system design.}, language = {en} } @inproceedings{HoellthalerHaglKennel2019, author = {H{\"o}llthaler, Julia and Hagl, Rainer and Kennel, Ralph}, title = {Bandwidth Improvements of Linear Direct Drives with a 100 kHz PWM-Frequency}, series = {2019 12th International Symposium on Linear Drives for Industry Applications (LDIA), Neuchatel, Switzerland}, booktitle = {2019 12th International Symposium on Linear Drives for Industry Applications (LDIA), Neuchatel, Switzerland}, year = {2019}, abstract = {A calculation method for a robust servo controller design depending on the sampling time and the processing dead time was developed for mechanically stiff drives. With a test stand for high dynamic and high positioning accuracy, the theoretical calculations for the high bandwidth improvements are verified. The test stand includes a voice coil motor and a power electronic with Gallium Nitride (GaN) power semiconductors for switching frequencies of more than 100kHz.}, language = {en} } @inproceedings{HoellthalerHaglKennel2019, author = {H{\"o}llthaler, Julia and Hagl, Rainer and Kennel, Ralph}, title = {Bandwidth Improvements for Current Control Loops with a 100 kHz PWM Frequency and GaN Power Semiconductors}, series = {2019 58th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE), Hiroshima, Japan}, booktitle = {2019 58th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE), Hiroshima, Japan}, year = {2019}, abstract = {A discrete-time design method for a robust current controller of a servo drive has been developed. It takes the sampling time, the processing dead time and the dynamic behavior of the A/D converter into account. The theoretical calculations are verified using a test stand for high dynamics. The test stand includes a voice coil motor and power electronics with Gallium Nitride (GaN) power semiconductors for switching frequencies of more than 100 kHz. The bandwidth of the current control loop can be improved from typically 1 kHz to 1.5 kHz with insulated-gate bipolar transistor (IGBT) power semiconductors in state-of-the-art motion control systems to 10 kHz and more.}, language = {en} } @inproceedings{HoellthalerHaglKennel2020, author = {H{\"o}llthaler, Julia and Hagl, Rainer and Kennel, Ralph}, title = {Influence of the PWM Frequency on Dynamic and Position Stability of Servo Drives}, series = {25th International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Virtual Meeting}, booktitle = {25th International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Virtual Meeting}, year = {2020}, abstract = {The dynamic behavior and position stability of servo drives are influenced by many parameters. One major influencing parameter is the pulse width modulation (PWM) frequency. With inverters based on wide bandgap semiconductors, the PWM frequency can be increased. This enables a substantial increase in the current control bandwidth. The paper focuses on the influence of the PWM frequency on the dynamics of control loops and position stability, which are derived from theoretical correlations. The theory is verified using a test bench for high dynamic and position stability. The test bench is equipped with a voice coil motor and power electronic with gallium nitride (GaN) power semiconductors for switching frequencies of 100kHz and over. The achieved position stability, measured with a laser-based comparator at the tool center point, is lower than "+-1nm" with a standard deviation of "0.16nm" at a PWM frequency of "f_PWM=100kHz".}, language = {en} } @inproceedings{DechantSeligerKennel2019, author = {Dechant, Eduard and Seliger, Norbert and Kennel, Ralph}, title = {Performance of a GaN Half Bridge Switching Cell with Substrate Integrated Chips}, series = {PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, booktitle = {PCIM Europe 2019 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, pages = {7}, year = {2019}, abstract = {Wide-bandgap semiconductors such as Silicon Carbide (SiC) or Gallium Nitride (GaN) enable fast switching and high switching frequencies of power electronics. However, this potential can not be exploited due to limitations caused by parasitic elements of packaging and interconnections. This paper shows a possibility to minimize parasitic elements of a half-bridge switching cell with 650 V GaN dies integrated into a printed circuit substrate. A sub-nH commutation loop of 0.5 nH inductance gives superior switching characteristics compared to circuits with packaged dies. Simulation and experimental results of an inverse double pulse test confirm our expectations. This study further reveals additional benefits of the proposed technology in terms of mechanical stability and thermal interfacing to heat sinks compared to circuits with packaged dies.}, language = {en} } @inproceedings{DechantSeligerKennel2019, author = {Dechant, Eduard and Seliger, Norbert and Kennel, Ralph}, title = {A study of dielectric breakdown of a half-bridge switching cell with substrate integrated 650V GaN dies}, series = {2019 IEEE International Workshop on Integrated Power Packaging (IWIPP), Toulouse, France}, booktitle = {2019 IEEE International Workshop on Integrated Power Packaging (IWIPP), Toulouse, France}, year = {2019}, abstract = {This paper proposes an ultra-low inductance half-bridge switching cell with substrate integrated 650V GaN bare dies. A vertical parallel-plate waveguide structure with 100 μm layer thickness results in a commutation loop inductance of 0.5 nH resulting in a negligible drain-source voltage overshoot in the inductive load standard pulse test. On the other hand reliable circuit operation requires an assessment of the isolation strength of the thin dielectric layer in the main commutation loop, because critical high local electric fields might occur between the pads. Measurements of the dielectric breakdown voltage followed by a statistical failure analysis provide a characteristic life of 14.7 kV and a 10\% quantile of 13.5kV in the Weibull fitted data. This characteristic life depends strongly on the ambient temperature and drops to 4.1kV at 125°C. Additionally, ageing tests show an increasing in dielectric breakdown voltage after 500h, 1000h and 2000h at 125°C high-temperature storage due to resin densification processes.}, language = {en} } @article{DechantSeligerKennel2019, author = {Dechant, Eduard and Seliger, Norbert and Kennel, Ralph}, title = {Power cycling and temperature endurance test of a GaN switching cell with substrate integrated chips}, series = {Microelectronics Reliability}, volume = {100-101}, journal = {Microelectronics Reliability}, pages = {113372}, year = {2019}, abstract = {We present a reliability study of a half-bridge switching cell with substrate integrated 650 V GaN HEMTs. Power Cycling Testing with a ΔTj of 100 K has revealed thermo-mechanically induced failures of contact vias after more than 220 kcycles. The via failure mode of contact opening is confirmed by reverse-bias pulsed IV-measurements to be primarily triggered by a ΔTj imposed thermal gradient and not by a high Tj. The chip electrical characteristics, however, remained unaffected during Power Cycling. Furthermore, a High Temperature Storage test at 125 °C for 5000 h has shown no changes in the electrical performance of substrate integrated GaN HEMTs.}, language = {en} } @inproceedings{SeligerDechantBrendeletal.2020, author = {Seliger, Norbert and Dechant, Eduard and Brendel, Christian and Kennel, Ralph}, title = {Reduction of Common Mode EMI noise in microstrip line based commutation paths designed for sub-nH loop inductance}, series = {CIPS 2020 - 11th International Conference on Integrated Power Electronics Systems, Berlin - Virtual Meeting}, booktitle = {CIPS 2020 - 11th International Conference on Integrated Power Electronics Systems, Berlin - Virtual Meeting}, pages = {6}, year = {2020}, abstract = {We present a numerical and experimental design study for reducing conducted common mode noise for frequencies below 10MHz generated in switching cells comprising sub-nH commutation loops. Compared to conventional methods of adding external gate resistors our approach does not degrade efficiency. A parallel plate loop design (characterized by a minimum loop inductance and small board area usage) is found suboptimal in terms of conducted EMI compared to a micro-strip line loop geometry. The net ground impedance rather than the net ground inductance is found to mainly contribute to the observed EMI noise.}, language = {en} } @inproceedings{HilverkusHaglKennel2020, author = {Hilverkus, Johannes and Hagl, Rainer and Kennel, Ralph}, title = {Structural Mechanical Limitations of Dynamics of Servo Drives}, series = {25th International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Virtual Meeting}, booktitle = {25th International Symposium on Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), Virtual Meeting}, pages = {11 -- 16}, year = {2020}, language = {en} } @inproceedings{StubenrauchSeligerSchusteketal.2015, author = {Stubenrauch, Franz and Seliger, Norbert and Schustek, Maximilian and Lebedev, Alexey and Schmitt-Landsiedel, Doris}, title = {A 13.56MHz class e power amplifier for inductively coupled DC supply with 95\% power added efficiency (PAE)}, series = {2015 International EURASIP Workshop on RFID Technology (EURFID), Rosenheim}, booktitle = {2015 International EURASIP Workshop on RFID Technology (EURFID), Rosenheim}, pages = {87 -- 93}, year = {2015}, abstract = {Recent development of GaN power transistors with blocking voltages up to 650V enables novel power electronics applications with outstanding performance in high-frequency operation. This paper demonstrates a class E power amplifier with 13.56MHz switching frequency for inductively coupled DC power supplies. Continuous wave output power up to 200W is achieved with 95\% Power Added Efficiency (PAE).}, language = {en} } @inproceedings{SeligerStubenrauchSchmittLandsiedel2016, author = {Seliger, Norbert and Stubenrauch, Franz and Schmitt-Landsiedel, Doris}, title = {A Parametric Layout Study of Radiated Emission from High-Frequency Half-Bridge Switching Cells}, series = {CIPS 2016 - 9th International Conference on Integrated Power Electronics Systems, N{\"u}rnberg}, booktitle = {CIPS 2016 - 9th International Conference on Integrated Power Electronics Systems, N{\"u}rnberg}, pages = {6}, year = {2016}, abstract = {We present a numerical modeling study of radiated emission from half-bridge switching cells based on the method of moments (MoM). A low loop inductance cell design enables high-speed switching of power semiconductors which is demonstrated on a prototype circuit. The layout is further optimized for low radiated emission by variation of the heat sink placement. This is achieved by the heat sink attached to the phase terminal. The performance of the structure in terms of loop impedance, electric field radiation and sensitivity to cable attachments are numerically studied. Emission peaks arising from loop resonances can be reduced by over 20 dB with damping elements in the switching cell. The improved EMI performance of the proposed structure is attributed to decoupling of the loop current from the heat sink structure.}, language = {en} } @inproceedings{StubenrauchSeligerSchmittLandsiedel2016, author = {Stubenrauch, Franz and Seliger, Norbert and Schmitt-Landsiedel, Doris}, title = {A Simplified SPICE Model for Fast Parametric Optimization of High Voltage Power Electronic Circuits in the Megahertz Range}, series = {CIPS 2016; 9th International Conference on Integrated Power Electronics Systems, N{\"u}rnberg}, booktitle = {CIPS 2016; 9th International Conference on Integrated Power Electronics Systems, N{\"u}rnberg}, pages = {6}, year = {2016}, abstract = {An accurate SPICE model is proposed in this paper to calculate the power losses of high voltage converter systems. This supports power circuit optimization in the very first design stage. The parasitic package inductances and the nonlinear voltage dependent semiconductor capacitances are taken into account. In addition the high frequency behavior of the power inductor is investigated. A detailed loss breakdown is done to analyze the main sources of power loss and their physical reasons. The simulation results of the converter waveforms and of its efficiency match very well to the experimental results. The prototype boost converter shows a top efficiency greater than 98.3 \% at a switching frequency of 1 MHz and an output voltage of 400 V at the maximum output power of 1 kW.}, language = {en} } @inproceedings{StubenrauchSeligerSchmittLandsiedel2016, author = {Stubenrauch, Franz and Seliger, Norbert and Schmitt-Landsiedel, Doris}, title = {A Low Impedance Drive Circuit to Suppress the Spurious Turn-On in High Speed Wide Band-Gap Semiconductor Halfbridges}, series = {PCIM Europe 2016; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, booktitle = {PCIM Europe 2016; International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, N{\"u}rnberg}, pages = {8}, year = {2016}, abstract = {A gate drive circuit for gallium nitride (GaN) enhancement mode (e-mode) transistors is presented, which avoids parasitic turn-on of the power devices in the halfbridge configuration. New e-mode GaN devices turn on at very low threshold voltages between 1V and 2V. This makes the transistors highly sensitive to spurious turn-on and thus reduces the required safety margin of the gate drive signals. To avoid this parasitic turn-on, a very low gate loop impedance is required. This prevents the halfbridge against bridge shorts during the switching events and guarantees stable gate drive control with increased switching efficiency. The new gate drive circuit is developed in a SPICE simulation environment and verified in a prototype setup by a double pulse test. The simulation matches very well with the experimental result and demonstrates the suppression of parasitic semiconductor turn-on with the proposed gate drive. Furthermore the dissipated switching energy is reduced, compared to a standard gate drive circuit. High DCDC converter efficiency of 98.67\% at 1kW output power is achieved by using the driving circuit for a buck converter prototype with 200kHz switching frequency.}, language = {en} } @inproceedings{SeligerStubenrauchBrendeletal.2017, author = {Seliger, Norbert and Stubenrauch, Franz and Brendel, Christian and Schmitt-Landsiedel, Doris}, title = {Impact of Circuit Carrier Technologies on MHz-switching of GaN Half-Bridge Circuits}, series = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy, N{\"u}rnberg}, booktitle = {PCIM Europe 2017 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy, N{\"u}rnberg}, pages = {1407 -- 1415}, year = {2017}, abstract = {Increasing the switching frequency has been one of the most beneficial advancements in modern power electronics. This trend has been enabled by progress in power semiconductors resulting in increased power densities, efficiencies and control dynamics. The aim of this study is to analyze the influence of three different circuit carrier technologies on switching power loss of 650 V hardswitching GaN devices. Limitations and solutions for half-bridge circuits operating at MHz-switching are investigated by modeling and experiments on a prototype.}, language = {en} } @inproceedings{VersenKipfelsbergerBernhardt2020, author = {Versen, Martin and Kipfelsberger, Stefan and Bernhardt, Andreas}, title = {Einf{\"u}hrung in die Aufbau- und Verbindungstechnik durch eine interaktive und praxisnahe Qualifizierung in der Leiterplattentechnik}, series = {Tagungsband 2. Symposium Elektronik und Systemintegration ESI 2020: "Intelligente Systeme und ihre Komponenten: Forschung und industrielle Anwendung"}, booktitle = {Tagungsband 2. Symposium Elektronik und Systemintegration ESI 2020: "Intelligente Systeme und ihre Komponenten: Forschung und industrielle Anwendung"}, address = {Landshut}, isbn = {978-3-9818439-4-1}, pages = {54 -- 62}, year = {2020}, abstract = {F{\"u}r eine Einf{\"u}hrung in die fertigungstechnischen Grundlagen der Aufbau- und Verbindungstechnik sind im Wahlfach „Leiterplattentechnik Praktikum" an der Technischen Hochschule (TH) Rosenheim Inhalte der Prozesstechnik und des Leiterplattendesigns miteinander kombiniert. Zu Beginn der Veranstaltung zeichnen die Praktikumsteilnehmer ein Layout f{\"u}r eine Leiterbahn-Teststruktur, welche anschließend im Haus gefertigt wird. Nach der Fertigung folgt eine elektrische und optische Charakterisierung zur Kontrolle der Prozessqualit{\"a}t. Die praxisnahe Erstellung eines einlagigen Layouts f{\"u}r eine LED-Taschenlampe auf Basis eines vorgegebenen Schaltplans und innerhalb einer begrenzten Platinenfl{\"a}che sowie dessen Fertigung bef{\"a}higen die Kursteilnehmer sp{\"a}ter, eigene Layouts f{\"u}r elektronische Schaltungen selbstst{\"a}ndig zu entwickeln. Die anspruchsvolle, teilautomatische Best{\"u}ckung einer zweilagigen, vorgegebenen SMT(Surface Mount Technology)-Leiterplatte, die ein FM-Radio mit Capacitive Touch-Steuerung bildet, rundet die erfolgreiche Qualifizierung in der Leiterplattentechnik ab.}, language = {de} } @inproceedings{WohlschlaegerHolstVersen2020, author = {Wohlschl{\"a}ger, Maximilian and Holst, Gerhard and Versen, Martin}, title = {Automatische Erkennung von Kunststoffen durch bildgebende Fluoreszenzabklingzeitmessung}, series = {Tagungsband: AALE 2020 - Automatisierung und Mensch-Technik-Interaktion 17. Fachkonferenz}, booktitle = {Tagungsband: AALE 2020 - Automatisierung und Mensch-Technik-Interaktion 17. Fachkonferenz}, publisher = {VDE Verlag Berlin}, isbn = {978-3-8007-5180-8}, pages = {223 -- 231}, year = {2020}, language = {de} } @inproceedings{HeitauerVersen2020, author = {Heitauer, Mathias and Versen, Martin}, title = {Co-Simulation eines zweistufigen Operationsverst{\"a}rkers mit MATLAB/Simulink und Cadence ADE}, series = {Tagungsband: AALE 2020 - Automatisierung und Mensch-Technik-Interaktion 17. Fachkonferenz}, booktitle = {Tagungsband: AALE 2020 - Automatisierung und Mensch-Technik-Interaktion 17. Fachkonferenz}, publisher = {VDE Verlag Berlin}, address = {Berlin}, isbn = {978-3-8007-5180-8}, pages = {287 -- 291}, year = {2020}, abstract = {Ein zweistufiger Operationsverst{\"a}rker wird parallel in einer 180nm CMOS Technologie in der Entwicklungsumgebung von Cadence ADE und in MATLAB/Simulink in einem modellbasierten Ansatz entworfen und simuliert. F{\"u}r den Entwurf in MATLAB/Simulink wird das Kleinsignalersatzschaltbild der physikalischen Schaltung verwendet. Mit Hilfe der Co-Simulation zwischen Cadence und MATLAB/Simulink wird das Verhalten simuliert und ausgewertet. Die Ergebnisse aus beiden Modellen stimmen {\"u}berein, wodurch festgestellt werden kann, dass die Co-Simulation erfolgreich war.}, language = {de} } @inproceedings{WohlschlaegerHolstVersen2020, author = {Wohlschl{\"a}ger, Maximilian and Holst, G. and Versen, Martin}, title = {A novel approach to optically distinguish plastics based on fluorescence lifetime measurements}, series = {2020 IEEE Sensors Applications Symposium (SAS), Kuala Lumpur, Malaysia}, booktitle = {2020 IEEE Sensors Applications Symposium (SAS), Kuala Lumpur, Malaysia}, pages = {1 -- 6}, year = {2020}, language = {en} } @article{ObermeierSchumacherBarthetal.2021, author = {Obermeier, Frederik and Schumacher, Mara and Barth, Simon and Karlinger, Peter and Schemme, Michael and Altst{\"a}dt, Volker}, title = {Verst{\"a}rkung von Polypropylen mit Holzfasern durch Direkt-Compoundierung}, series = {Zeitschrift Kunststofftechnik}, volume = {2021}, journal = {Zeitschrift Kunststofftechnik}, number = {2}, publisher = {Carl Hanser Verlag}, address = {M{\"u}nchen}, pages = {87 -- 111}, year = {2021}, abstract = {Erg{\"a}nzend zum bisherigen Stand der Wissenschaft und Technik wurden in dieser Ver{\"o}ffentlichung Fichtefasern aus einem thermo-mechanischen Aufschlussprozess {\"u}ber einen Spritzgusscompounder mit Polypropylen und Haftvermittler direkt compoundiert. Bei der direkten einstufigen Verarbeitung wurde ein steigender Holzfaseranteil bis 30 Gew.-\% untersucht. Die Charakterisierung der Materialkombinationen erfolgte durch Zugversuche, Melt-Flow-Rate Messungen, Dichtebestimmung, Mikroskopie und Kerbschlagbiegeversuche. Bei steigendem Holzfaseranteil wird eine Steigerung der Zugeigenschaften, der Viskosit{\"a}t und der Dichte festgestellt. Die Kerbschlagz{\"a}higkeit bleibt bei steigendem Holzfaseranteil im Rahmen der Standardabweichung konstant, ist jedoch im Vergleich zum unver{\"a}nderten Grundpolymer geringer.}, language = {de} } @article{WohlschlaegerVersen2020, author = {Wohlschl{\"a}ger, Maximilian and Versen, Martin}, title = {Detection of plastics in water based on their fluorescence behavior}, series = {Journal of Sensors and Sensor Systems}, volume = {9}, journal = {Journal of Sensors and Sensor Systems}, number = {2}, pages = {337 -- 343}, year = {2020}, abstract = {Plastic waste is one of the biggest growing factors contributing to environmental pollution. So far there has been no established method to detect and identify plastics in environmental matrices. Thus, a method based on their characteristic fluorescence behavior is used to investigate whether plastics can be detected and identified in tap water under laboratory conditions. The experiments show that the identification of plastics as a function of water depth is possible. As the identification becomes more difficult with higher water depths, investigations with a highly sensitive imaging method were carried out to obtain an areal integration of the fluorescent light and thus better results.}, language = {en} } @article{VersenErnst2020, author = {Versen, Martin and Ernst, W.}, title = {Row hammer avoidance analysis of DDR3 SDRAM}, series = {Microelectronics Reliability}, journal = {Microelectronics Reliability}, pages = {113744}, year = {2020}, abstract = {A DDR3 SDRAM test setup implemented on the Griffin III test system from HILEVEL Technologies is used to analyse the row hammer bug. Row hammer pattern experiments are compared to standard retention tests for different manufacturing technologies. The row hammer effect is depending on the number of stress activation cycles. The analysis is extended to an avoidance scheme with refreshes similar to the Target Row Refresh scheme for the DDR4 SDRAM technology.}, language = {en} } @inproceedings{LeiterWohlschlaegerAueretal.2021, author = {Leiter, Nina and Wohlschl{\"a}ger, Maximilian and Auer, Veronika and Versen, Martin and Laforsch, Christian}, title = {A Novel Approach to Identify Wood Species Optically using Fluorescence Lifetime Imaging Microscopy}, series = {SMSI 2021 Conference - Sensor and Measurement Science International}, booktitle = {SMSI 2021 Conference - Sensor and Measurement Science International}, pages = {169 -- 170}, year = {2021}, abstract = {This contribution presents the results obtained with fluorescence lifetime imaging microscopy (FLIM)within the optical identification and differentiation of the four wood species walnut, beech, spruce, and maple. The experimental setup as well as the evaluation algorithm, with which the experiments were carried out, is explained briefly.}, language = {en} } @article{ObermeierKarlingerSchemmeetal.2022, author = {Obermeier, Frederik and Karlinger, Peter and Schemme, Michael and Altst{\"a}dt, Volker}, title = {Thermoplastic Hybrid Composites with Wood Fibers: Bond Strength of Back-Injected Structures}, series = {Materials}, volume = {15}, journal = {Materials}, number = {7}, pages = {2473}, year = {2022}, abstract = {Due to their lightweight potential and good eco-balance, thermoplastic hybrid composites with natural fiber reinforcement have long been used in the automotive industry. A good alternative to natural fibers is wood fibers, which have similar properties but are also a single-material solution using domestic raw materials. However, there has been hardly any research into wood fibers in thermoplastic back-injected hybrid composites. This article compares the bond strength of an injection molded rib from polypropylene (PP) and wood fibers to different non-wovens. The non-wovens consisted of wood fibers (spruce) or alternatively natural fibers (kenaf, hemp), both with a polypropylene matrix. Pull-off and instrumented puncture impact tests show that, given similar parameters, the natural and wood-fiber-hybrid composites exhibit very similar trends in bond strength. Further tests using viscosity measurements, microscopy, and computed tomography confirm the results. Wood-fiber-reinforced thermoplastic hybrid composites can thus compete with the natural fiber composites in terms of their mechanical behavior and therefore present a good alternative in technical semi-structural applications.}, language = {en} } @inproceedings{Seliger2021, author = {Seliger, Norbert}, title = {Design of a Half-Bridge Converter for Self-Adapting Capacitive Wireless Power Transfer}, series = {IEEE 2021 CENCON conference}, booktitle = {IEEE 2021 CENCON conference}, publisher = {IEEE}, pages = {6}, year = {2021}, abstract = {We present the design of a half-bridge converter for a capacitively coupled wireless power transfer system. The load signal acts as a positive feedback signal for a self-oscillation circuit which generates the driving gate signals for the converter. Our research reveals a robust wireless operation for a large range of load resistors and coupling capacitors. Based on an electric network analysis we obtain design criteria for self-oscillation and for the power transfer. The theoretical predictions are confirmed by circuit simulation and measurement results on a converter prototype with GaN-HEMTs. We report on a transfer efficiency of 92\% for a power greater than 50W at a switching frequency of 300kHz and 200V DC link voltage.}, language = {en} } @inproceedings{Seliger2021, author = {Seliger, Norbert}, title = {A Free Oscillating Half-Bridge Converter for Capacitively Coupled Wireless Power Transfer}, series = {IEEE 6th International Forum on Research and Technology for Society and Industry (RTSI)}, booktitle = {IEEE 6th International Forum on Research and Technology for Society and Industry (RTSI)}, publisher = {IEEE}, pages = {6}, year = {2021}, abstract = {In this research we present a short distance capacitively coupled wireless power transfer (WPT) system with a self-oscillating half-bridge converter, which uses a positive feedback signal from the WPT system. By this novel implementation we find additional features of the system compared to linear amplifier based systems. With the DC bias voltage supplying the power converter, we achieve a controllable output power, tunable self-oscillation frequency and extension of the self-oscillation range. We present the analytical expressions for the converter waveforms. The theoretical analysis is confirmed by circuit simulation results and measurements on a prototype featuring a half-bridge converter with Gallium-Nitide (GaN) HEMTs. We achieve a system efficiency of 93\% at a load power of 83W and 150kHz switching frequency.}, language = {en} } @phdthesis{Uhl2018, author = {Uhl, Cornelius}, title = {Untersuchungen zur Eignung von Pferdemist als Biomassebrennstoff}, school = {Technische Hochschule Rosenheim}, year = {2018}, abstract = {Pferdemist stellt eine große ungenutzte Ressource zur Erzeugung regenerativer Energie dar. Jedoch ist eine thermische Umsetzung durch hohe St{\"o}rstoffanteile sowie den physikalischen und mechanischen Eigenschaften des Rohmists sehr anspruchsvoll. Die vorliegende Arbeit bildet eine systematische empirische Datengrundlage f{\"u}r die Beurteilung von Pferdemist als Biomassebrennstoff und zeigt M{\"o}glichkeiten zur positiven Beeinflussung der Brennstoffeigenschaften auf.}, language = {de} } @phdthesis{Eben2015, author = {Eben, Johannes}, title = {Identifikation und Reduzierung realer Schwankungen durch praxistaugliche Prozessf{\"u}hrungsmethoden beim Spritzgießen}, school = {Technische Hochschule Rosenheim}, year = {2015}, abstract = {Eine stetig gleichbleibende hohe Qualit{\"a}t zu fertigen, ist erkl{\"a}rtes Ziel des Spritzgießgewer-bes. Aus technischen oder wirtschaftlichen Gr{\"u}nden ist es jedoch nicht m{\"o}glich, f{\"u}r konstan-te Produktionsrahmenbedingungen zu sorgen. Die effizienteste Methode ist , die Schwan-kungen {\"u}ber die Wahl der richtigen Prozessf{\"u}hrungsmethode auszugleichen. Im ersten Teil der Arbeit konnte herausgefunden werden, welche praxisrelevanten St{\"o}rgr{\"o}-ßen einen Einfluss auf den Spritzgießprozess haben und wie sie sich auswirken. Bei den Materialparametern sind {\"A}nderungen der Viskosit{\"a}t (15 \%) und der Einfriertemperatur des Materials (4 °C) am Einzug festzustellen. Zus{\"a}tzlich ver{\"a}nderte sich das Messverhalten der Drucksensoren, wodurch ein Drift von 5 bar entstand. St{\"o}rgr{\"o}ßenbedingt {\"a}nderten sich auch die Prozesstemperaturen um 1 °C. Im zweiten Teil der Arbeit werden diverse, w{\"a}hrend der Arbeit entwickelte, Prozessf{\"u}h-rungsmethoden miteinander verglichen. Aufgabe war es, die im ersten Teil gefundenen rea-len st{\"o}rgr{\"o}ßenbedingten Einfl{\"u}sse zu kompensieren. Es stellte sich heraus, dass sich ledig-lich die materialbedingten Schwankungen nicht ausgleichen lassen. Zumindest k{\"o}nnen de-ren Auswirkungen durch eine Regelung der werkstoffnahen Parameter abschw{\"a}cht werden.}, language = {de} } @inproceedings{ObermeierKarlingerSchemmeetal.2021, author = {Obermeier, Frederik and Karlinger, Peter and Schemme, Michael and Altst{\"a}dt, Volker}, title = {Verbundhaftung von thermoplastischen Hybridverbunden mit Natur-und Holzfaserverst{\"a}rkung}, series = {Technomer 2021}, booktitle = {Technomer 2021}, publisher = {Technische Universit{\"a}t Chemnitz}, address = {Chemnitz}, isbn = {978-3-939382-15-7}, pages = {1 -- 12}, year = {2021}, abstract = {Leichtbau, ressourcenschonende Herstellungstechnologien und die Verwendung nachwachsender Rohstoffe sind zentrale Themen des 21. Jahrhunderts. Thermoplastische Hybridverbunde mit Naturfaserverst{\"a}rkung sind seit langem Stand der Technik und werden vor allem in der Automobilindustrie verwendet. Holzfasern sind in diesem Bereich jedoch noch nicht umfassend untersucht. Der Vortrag befasst sich mit dem Potenzial von Holzfasern (Fichte) f{\"u}r thermoplastische Hybridverbunde im Vergleich zu Naturfasern (Kenaf, Hanf). Dabei werden mechanische Untersuchungen (Kopf-Zug-Versuch und instrumentierter Durchstoßversuch) von zwei hybriden Bauteilen gezeigt. Die Verbundhaftung wird bei unterschiedlichen Sch{\"a}digungsmechanismen in Abh{\"a}ngigkeit ausgew{\"a}hlter Parameter dargestellt. Die relevanten Effekte werden erg{\"a}nzend durch Mikroskopie und Computertomographie beschrieben. Es zeigt sich, dass thermoplastische Hybridverbunde mit Holzfasern mit dem Benchmark aus Naturfasern mechanisch konkurrieren k{\"o}nnen. Zudem zeigen Holzfasern andere Vorteile wie geringe Rohstoffrisiken.}, language = {de} } @inproceedings{WiedlKarlingerSchemmeetal.2021, author = {Wiedl, Sebastian and Karlinger, Peter and Schemme, Michael and List, Manuela}, title = {Vergleich von unterschiedlichen Aufschmelzverfahren und die daraus resultierenden Eigenschaften f{\"u}r WPC-Spritzgussteile}, series = {Technomer 2021}, booktitle = {Technomer 2021}, publisher = {Technische Universit{\"a}t Chemnitz}, address = {Chemnitz}, isbn = {978-3-939382-15-7}, pages = {1 -- 13}, year = {2021}, abstract = {Leichtbau und ressourcenschonende Herstellungstechnologien sind zentrale Themen des 21. Jahrhunderts. Im Zuge dessen werden vermehrt Naturprodukte in der Kunststoffverarbeitung eingesetzt. Eine Sparte dabei bilden Holz-Polymer Werkstoffe (WPC), welche seit 2014 eine Verdoppelung in der Produktionsmenge erfahren haben. Dabei werden meist Holzpartikel statt Fasern als F{\"u}ll- und Verst{\"a}rkungsstoff eingesetzt. Der Vortrag befasst sich mit dem Vergleich von verschiedenen Aufbereitungsm{\"o}glichkeiten von WPCs mit Holzfaserverst{\"a}rkung hinsichtlich Mechanik und thermischer Sch{\"a}digung des temperaturempfindlichen Holzes. Teil der Untersuchung ist die einstufige Verarbeitung mittels eines Injection-Moulding-Compounders sowie die zweistufige Verarbeitung mittels Compounder und Heiz-K{\"u}hl-Mischer mit anschließendem Urformen an der Spritzgussmaschine.}, language = {de} } @inproceedings{WeidnerKasparSeliger2011, author = {Weidner, Karl and Kaspar, Michael and Seliger, Norbert}, title = {Innovative Leistungsmodule}, series = {Produktion von Leiterplatten und Systemen (PLUS)}, booktitle = {Produktion von Leiterplatten und Systemen (PLUS)}, pages = {1408 -- 1412}, year = {2011}, language = {de} } @inproceedings{WeidnerKasparSeliger2012, author = {Weidner, Karl and Kaspar, Michael and Seliger, Norbert}, title = {Planar Interconnect Technology for Power Module System Integration}, series = {7th International Conference on Integrated Power Electronics Systems (CIPS)}, booktitle = {7th International Conference on Integrated Power Electronics Systems (CIPS)}, publisher = {VDE-VERLAG GMBH}, pages = {13.1}, year = {2012}, abstract = {The recent developments in power semiconductor devices and increasing demands on reliability as well as on operation performance require innovative package technologies. Such a novel package technique based on a Planar Interconnect Technology (SiPLIT®) for power modules is introduced in this work. This package features thick Cu interconnects on a high-reliable insulating film for power semiconductor chip top contacts. Due to the conductor structure and contact technology, on-resistance and stray inductances are very low compared to state-of-the-art Al wire bonds. In addition, large area contacting improves the power cycling capability and surge current robustness significantly. These remark-able properties have been verified on several prototype modules where the manufacturing process has also been optimised in terms of cost-effectiveness, system integration and maturity for series production.}, language = {en} } @inproceedings{Seliger2012, author = {Seliger, Norbert}, title = {Zuverl{\"a}ssigkeit mechatronischer Systeme: Bewertung der Lebensdauer der Leistungselektronik}, series = {Internationales Forum Mechatronik}, booktitle = {Internationales Forum Mechatronik}, pages = {11}, year = {2012}, language = {de} } @inproceedings{Seliger2014, author = {Seliger, Norbert}, title = {Probabilistic model based analysis of electrolytic capacitor ageing and failures in a single-phase power factor correction circuit}, series = {8th International Conference on Integrated Power Electronics Systems (CIPS)}, booktitle = {8th International Conference on Integrated Power Electronics Systems (CIPS)}, publisher = {VDE-VERLAG GMBH}, pages = {6}, year = {2014}, abstract = {Wear-out failures of electrolytic capacitors in single phase power factor correction circuits are investigated in this study. A probabilistic model based approach for temperature driven capacitor degradation is chosen to analyse the probability of failure of the output capacitor bank. Different design strategies are proposed and evaluated in terms of reliability. Parametric variation of capacitor bank designs provides influential effects on system volume, cost and reliability which is modeled for a sample size of 1000 power supply units.}, language = {en} }