@inproceedings{WirthReumannKuechleretal., author = {Wirth, Isabell and Reumann, Andreas and K{\"u}chler, Andreas and Zink, Markus H. and Berger, Frank and Langens, Achim and Schnitzler, Tim and Heil, B.}, title = {Measurement and simulation of transient field stresses and impacts on advanced insulation design and new test procedures for HVDC components}, series = {Cigre-Konferenz, Paris}, booktitle = {Cigre-Konferenz, Paris}, language = {en} } @article{ZinkKlipfelBergeretal., author = {Zink, Markus H. and Klipfel, V. and Berger, Frank and K{\"u}chler, Andreas and Voll, S.}, title = {Der Einfluss von Temperatur und Streukapazit{\"a}t auf diagnostische Kapazit{\"a}ts- und Verlustfaktormessungen von 400 kV-Hochspannungstransformatordurchf{\"u}hrungen}, series = {ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel"}, journal = {ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel"}, address = {Fulda}, language = {de} } @inproceedings{WirthHessdoerferKuechleretal., author = {Wirth, Isabell and Heßd{\"o}rfer, Nadja and K{\"u}chler, Andreas and Zink, Markus H. and Langens, Achim and Berger, Frank}, title = {Measurements and calculations of critical thermal and electrical stress conditions for HVDC bushings}, series = {20th International Symposium on High Voltage Engineering, Buenos Aires, 2017}, booktitle = {20th International Symposium on High Voltage Engineering, Buenos Aires, 2017}, language = {en} } @inproceedings{HopfWirthSturmetal., author = {Hopf, K. and Wirth, Isabell and Sturm, Sebastian and K{\"u}chler, Andreas and Zink, Markus H. and Langens, Achim}, title = {Temperature-dependent and anisotropic electrical conductivity of resin-impregnated paper}, series = {Power and Energy Student Summit, N{\"u}rnberg, 2017}, booktitle = {Power and Energy Student Summit, N{\"u}rnberg, 2017}, language = {en} } @inproceedings{WirthKuechlerZinketal., author = {Wirth, Isabell and K{\"u}chler, Andreas and Zink, Markus H. and Berger, Frank and Langens, Achim}, title = {Elektrische Feldverteilung und Polarisationsstr{\"o}me in HG{\"U} Durchf{\"u}hrungen}, series = {Fachtagung Polymere Isolierstoffe und ihre Grenzfl{\"a}chen, Zittau, 2018}, booktitle = {Fachtagung Polymere Isolierstoffe und ihre Grenzfl{\"a}chen, Zittau, 2018}, language = {de} } @article{WehnertOchsSchmittetal., author = {Wehnert, Kira-Kristin and Ochs, Dennis and Schmitt, Jan and Hartmann, J{\"u}rgen and Schiffler, Andreas}, title = {Reducing Lifecycle Costs due to Profile Scanning of the Powder Bed in Metal Printing}, series = {Procedia CIRP 98}, volume = {98}, journal = {Procedia CIRP 98}, publisher = {Elsevir}, pages = {684 -- 689}, abstract = {First time right is one major goal in powder based 3D metal printing. Reaching this goal is driven by reducing life cycle costs for quality measures, to minimize scrap rate and to increase productivity under optimal resource efficiency. Therefore, monitoring the state of the powder bed for each printed layer is state of the art in selective laser melting. In the most modern approaches the quality monitoring is done by computer vision systems working with an interference on trained neural networks with images taken after exposure and after recoating. There are two drawbacks of this monitoring method: First, the sensor signals - the image of the powder bed - give no direct height information. Second, the application of this method needs to be trained and labeled with reference images for several cases. The novel approach presented in this paper uses a laser line scanner attached to the recoating machine. With this new concept, a direct threshold measure can be applied during the recoating process to detect deviations in height level without prior knowledge. The evaluation can be done online during recoating and feedback to the controller to monitor each individual layer. Hence, in case of deviations the location in the printing plane is an inherent measurement and will be used to decide which severity of error is reported. The signal is used to control the process, either by starting the recoating process again or stopping the printing process. With this approach, the sources of error for each layer can be evaluated with deep information to evaluate the cause of the error. This allows a reduction of failure in the future, which saves material costs, reduces running time of the machine life cycle phase in serial production and results in less rework for manufactured parts. Also a shorter throughput time per print job results, which means that the employee can spent more time to other print jobs and making efficient use of the employee's work force. In summary, this novel approach will not only reduce material costs but also operating costs and thus optimize the entire life cycle cost structure. The paper presents a first feasibility and application of the described approach for test workpieces in comparison to conventional monitoring systems on an EOS M290 machine.}, language = {en} } @article{HayBeaumontLambengetal., author = {Hay, Bruno and Beaumont, Oliver and Lambeng, Nora and Cataldi, Michel and Lorrette, Christophe and Knopp, Kevin and Hartmann, J{\"u}rgen and Beckstein, Fabia and Stobitzer, Dorothea and Milošević, Nenad and Stepanic, Nenad and Wu, Jiyu and Mildeova, Petra}, title = {Inter‑laboratory Comparison on Thermal Diffusivity Measurements by the Laser Flash Method at Ultra‑high Temperature}, series = {International Journal of Thermophysics}, volume = {2023}, journal = {International Journal of Thermophysics}, pages = {44 -- 48}, abstract = {thermal diffusivity measurements by the laser flash method in the temperature range from 23 °C to 3000 °C. The main objective was to assess the variability and coherency of thermal diffusivity measurements performed at ultra-high temperatures at the European level. Three refractory materials (molybdenum, tungsten and isotropic graphite IG210) were selected for this inter-laboratory comparison, due to their high melting point. The disk-shaped specimens needed were machined from the same blocks of materials in order to reduce any potential scattering of results between participants due to inhomogeneity effects. The homogeneity of the sets of specimens was studied by the pilot laboratory (LNE) before launching the comparison process. Thermal diffusivity measurements were then carried out by the seven participants on the three materials during two successive thermal cycles up to the maximum temperatures that can be reached by the devices used. The analysis of results showed a good agreement between the participants for temperatures above 400 °C, with relative deviations within the uncertainties of measurement and lower than ± 4 \% for molybdenum, ± 5 \% for isotropic graphite and ± 9 \% for tungsten.}, language = {en} } @article{AckvaDresselEndres, author = {Ackva, Ansgar and Dreßel, Bernd and Endres, Julian}, title = {Umrichter in Hybridstruktur als Entwicklungswerkzeug und Pr{\"u}fsystem f{\"u}r elektrische Antriebe}, series = {FHWS Science Journal}, volume = {1}, journal = {FHWS Science Journal}, number = {2}, address = {W{\"u}rzburg}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-484}, pages = {25 -- 36}, abstract = {Die Entwicklung, Applikation und der Test von Wechselrichtern, insbesondere f{\"u}r Traktionsantriebe, ist mit einem hohen Aufwand f{\"u}r die Bereitstellung einer passenden Testumgebung verbunden. F{\"u}r gew{\"o}hnlich werden diese Tests in der Entwicklung als auch in der Fertigung mit Hilfe von Motor-Generator Pr{\"u}fst{\"a}nden durchgef{\"u}hrt, die wiederum f{\"u}r unterschiedliche Leistungsklassen vorgehalten werden m{\"u}ssen. In diesem Beitrag wird eine neuartige hochdynamische Umrichtertopologie vorgestellt, die als universelles Entwicklungs-, Applikations- und Pr{\"u}fsystem f{\"u}r Umrichter eingesetzt werden kann. Derzeit wird dieser Umrichter in Hybridstruktur im Rahmen eines Forschungsprojektes an der FHWS realisiert.}, language = {de} } @article{DastagerWeith2014, author = {Dastager, Lida and Weith, J{\"u}rgen}, title = {A correlation based method for measuring and monitoring the impulse response of analog LTI systems with low realization cost}, series = {FHWS Science Journal}, volume = {2 (2014)}, journal = {FHWS Science Journal}, number = {1}, organization = {Hochschule f{\"u}r angewandte Wissenschaften W{\"u}rzburg-Schweinfurt}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-996}, pages = {22 -- 38}, year = {2014}, abstract = {This article deals with the problem of measuring the impulse response of a linear time invariant (LTI) analog network. At the beginning three known measurement principles are discussed and compared with respect to their advantages and disadvantages. It is shown that good results can only be attained at the cost of measurement expense. Subsequently a new correlation based method is presented where low complexity and high quality results have not to be a contradiction. The measurement circuit basically consists of two m-sequence generators and an analog low pass filter. The characteristics of the proposed measurement circuit are examined and explained by two examples.}, language = {en} } @article{DastagerWeith2014, author = {Dastager, Lida and Weith, J{\"u}rgen}, title = {Ein Verfahren zur automatischen Abstimmung von Einseitenband-Empf{\"a}ngern}, series = {FHWS Science Journal}, volume = {2 (2014)}, journal = {FHWS Science Journal}, number = {1}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-1046}, pages = {16 -- 21}, year = {2014}, abstract = {Es wird ein Verfahren beschrieben, mit dessen Hilfe eine Korrektur der Demodulation von Einseitenband-Signalen (ESB-Signalen) vorgenommen werden kann. Eine solche Korrektur ist dann oft notwendig, wenn sich die Frequenzen, die zur Modulation und zur Demodulation verwendet worden sind, unterscheiden. Typischerweise tritt ein solcher Frequenzunterschied bei der {\"U}bertragung von prachsignalen auf, wenn kein festes Kanalraster zugrunde liegt. Das Korrekturverfahren basiert auf einer Analyse stimmhafter Sprachabschnitte mit dem MUSIC-Verfahren.}, language = {de} } @article{RimacDrljeVlaovićMioković, author = {Rimac-Drlje, Snježana and Vlaović, Jelena and Mioković, Željka}, title = {Gender Issues in Engineering Education}, series = {Papers of 33rd International Scientific Conference "Science in Practice"}, journal = {Papers of 33rd International Scientific Conference "Science in Practice"}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:863-opus-2724}, pages = {17 -- 21}, abstract = {Female students are a minority in most technical universities in the EU, and some efforts have been made in an attempt to increase the participation of women in engineering. The growing need for IT professionals is one of the main reasons of social interest in attracting more girls to this field. This article provides a comparison of gender-related differences, as well as approaches for improving male-to-female ratio and resolving gender-related problems in engineering education. The article also presents some results of the project "Strengthening women's position in the labor market", funded by the EU and implemented by the Faculty of Electrical Engineering in Osijek. The main objective of the project is to increase the employability of women in the Osijek-Baranja County by motivating more female students to enroll in some of the technical studies.}, language = {en} } @article{ZhongAmrehnRavikumaretal., author = {Zhong, Xia and Amrehn, Mario and Ravikumar, Nishant and Chen, Shuqing and Strobel, Norbert and Birkhold, Annette and Kowarschik, Markus and Fahrig, Rebecca and Maier, Andreas}, title = {Deep action learning enables robust 3D segmentation of body organs in various CT and MRI images}, series = {Scientific Reports}, volume = {11}, journal = {Scientific Reports}, number = {1}, doi = {10.1038/s41598-021-82370-6}, language = {en} } @incollection{KuechlerSchoberHarreretal., author = {K{\"u}chler, Andreas and Schober, F. and Harrer, S. and Krause, Ch. and Berger, Frank}, title = {Einfluss von Temperatur und Ligningehalt auf die elektrische Leitf{\"a}higkeit von Pressspan als HG{\"U}-Isolierwerkstoff}, series = {6. RCC-Fachtagung „Werkstoffe zur Anwendung in der el. Energietechnik unter den besonderen Anforderungen der HG{\"U}"}, booktitle = {6. RCC-Fachtagung „Werkstoffe zur Anwendung in der el. Energietechnik unter den besonderen Anforderungen der HG{\"U}"}, address = {Berlin}, pages = {268 -- 273}, language = {de} } @incollection{KuechlerSchoberHarreretal., author = {K{\"u}chler, Andreas and Schober, F. and Harrer, S. and Wolfinger, T. and Krause, Ch. and Exner, W. and Berger, Frank}, title = {Leitf{\"a}higkeit von Pressspan als diagnostische Kenngr{\"o}ße f{\"u}r HG{\"U}-Betriebsmittel}, series = {ETG-Fachbericht 144}, booktitle = {ETG-Fachbericht 144}, publisher = {VDE}, address = {Berlin}, language = {de} } @book{Eckert, author = {Eckert, Ludwig}, title = {Ein Beitrag zur Implementierung autonomer, intelligenter und feldbusgest{\"u}tzter Sensor-/Aktorsysteme im Feldbereich (CASE/SA)}, publisher = {VDI}, isbn = {3183571102}, language = {de} } @incollection{Kuechler, author = {K{\"u}chler, Andreas}, title = {Ausbildung und Steuerung elektrischer Felder bei Gleichspannungsbeanspruchung}, series = {6. RCC-Fachtagung „Werkstoffe zur Anwendung in der el. Energietechnik unter den besonderen Anforderungen der HG{\"U}"}, booktitle = {6. RCC-Fachtagung „Werkstoffe zur Anwendung in der el. Energietechnik unter den besonderen Anforderungen der HG{\"U}"}, address = {Berlin}, pages = {12 -- 50}, language = {de} } @incollection{KuechlerReumannWirthetal., author = {K{\"u}chler, Andreas and Reumann, Andreas and Wirth, Isabell and Langens, Achim and Berger, Frank}, title = {Erfassung transienter elektrischer Potentialverteilungen in thermisch hoch belasteten Gleichspannungsdurchf{\"u}hrungen}, series = {ETG-Fachbericht 144}, booktitle = {ETG-Fachbericht 144}, publisher = {VDE}, address = {Berlin}, abstract = {Mit Hilfe kapazitiver Steuerung k{\"o}nnen Durchf{\"u}hrungen hochspannungsf{\"u}hrende Leiter durch geerdete W{\"a}nde in Geb{\"a}uden oder Ger{\"a}ten f{\"u}hren. Bei zeitver{\"a}nderlichen Belastungen (Stoß-, Wechselspannungen) wird die gew{\"u}nschte Potentialaufteilung durch die Kapazit{\"a}ten zwischen den leitf{\"a}higen Steuerbel{\"a}gen erzwungen. Bei Gleichspannung ergibt sich eine resistive Steuerung, die bei homogener Leitf{\"a}higkeit des Isolierk{\"o}rpers eine prinzipiell gleichartige Potentialaufteilung ergibt. Durchf{\"u}hrungen sind jedoch thermisch hoch belastete Betriebsmittel, in denen starke Temperaturgradienten und in ihrer Folge starke Leitf{\"a}higkeitsgradienten entstehen, die zu einer erheblichen Verschiebung der Potentialverteilung f{\"u}hren k{\"o}nnen [1]. F{\"u}r Design und Diagnose ist das Verst{\"a}ndnis dieser bisher nur theoretisch erfassbaren Vorg{\"a}nge von großer Bedeutung. Deshalb wurden f{\"u}r experimentelle Untersuchungen zwei identische Durchf{\"u}hrungsk{\"o}rper hergestellt, die mit Temperaturf{\"u}hlern f{\"u}r thermische Messungen bzw. mit Anzapfungen f{\"u}r die Erfassung von elektrischen Potentialen ausger{\"u}stet wurden. Die identische Beheizung beider Leiterrohre erlaubt es, eine Korrelation gemessener thermischer und elektrischer Profile und Transienten herzustellen. F{\"u}r r{\"u}ckwirkungsfreie Messung der Gleichspannungspotentiale wurde ein Rotationsvoltmeter benutzt. Die Untersuchungen best{\"a}tigen das theoretisch erwartete thermisch-elektrische Verhalten und sie zeigen, dass erhebliche transiente und station{\"a}re elektrische Belastungen auftreten k{\"o}nnen, die im Zusammenhang mit thermischen Transienten und Belastungen gesehen werden m{\"u}ssen. Sie sind beim Design in Rechnung zu stellen und sie zeigen, dass die bei dielektrischen Diagnosemessungen erfassten Materialkenngr{\"o}ßen wichtige Aussagen {\"u}ber den elektrischen Belastungszustand der Durchf{\"u}hrung liefern k{\"o}nnen.}, language = {de} } @incollection{KuechlerHuellmandelAppoldetal., author = {K{\"u}chler, Andreas and H{\"u}llmandel, F. and Appold, M. and Liebschner, M. and Krump, R. and Titze, J.}, title = {Diagnose von Hochspannungsdurchf{\"u}hrungen durch PDC-Analyse}, series = {ETG-Fachbericht 104}, booktitle = {ETG-Fachbericht 104}, publisher = {VDE}, address = {Kassel}, language = {de} } @incollection{KuechlerHuellmandelBoehmetal., author = {K{\"u}chler, Andreas and H{\"u}llmandel, F. and B{\"o}hm, K. and Koch, N.}, title = {Einfluss {\"a}ußerer Grenzfl{\"a}chen auf die dielektrische Diagnose betriebsgealterter Hochspannungsdurchf{\"u}hrungen}, series = {ETG-Fachbericht 99}, booktitle = {ETG-Fachbericht 99}, publisher = {VDE}, address = {Hanau}, language = {de} } @incollection{KuechlerZinkBerger, author = {K{\"u}chler, Andreas and Zink, M. and Berger, Frank}, title = {Kompensation des Temperatureinflusses auf dielektrische Messungen im Zeitbereich zur Beschreibung von Isolierwerkstoffen}, series = {ETG-Fachbericht 140}, booktitle = {ETG-Fachbericht 140}, publisher = {VDE}, address = {Dresden}, language = {de} } @incollection{KuechlerHuellmandelBoehmetal., author = {K{\"u}chler, Andreas and H{\"u}llmandel, F. and B{\"o}hm, K. and Liebschner, M. and Appold, M. and Krump, R. and Titze, J.}, title = {Dielectric Diagnosis and Monitoring of High Voltage Bushings}, series = {51. IWK Int. Wissenschaft}, booktitle = {51. IWK Int. Wissenschaft}, publisher = {Technische Universit{\"a}t Ilmenau}, address = {Ilmenau}, language = {en} }