TY - CHAP A1 - Bleiholder, Stefan A1 - Spiertz, Martin A1 - Kettler, Frank T1 - Third-Party Listening Test as an Alternative to Conversational Tests in a Complex Automotive Hands-free Scenario – A Critical Consideration T2 - Fortschritte der Akustik DAGA 25 N2 - A comprehensive conversational test (CT) was carried out in a complex in-vehicle hands-free (HFT) environment, using an HFT development board installed in an interactive driving simulator and configured with typical hands- free impairments. A cordless phone was connected to a VoIP network on the other side of the connection. 18 test subjects, expert and naïve participants, evaluated various aspects of conversational quality, including listening quality, listening effort, double talk impairment, echo interference, interactivity and overall quality (as outlined in DAGA 2024). In the same scenario, two artificial head and torso simulators (HATS) were used to play back and record so-called pre-recorded conversations (PRC). The PRC included single talk sequences in both directions, as well as speech parts where both voices interact and are talking at the same time. The binaural recordings at both ends (HFT user, cordless phone user) were then assessed and rated by 32 naïve test subjects in a third-party listening test (TPLT) using the same quality aspects as in the CT. The great advantage of a TPLT compared to a CT is the much lower effort to set up and control the conditions. The auditory results of both test designs are presented, discussed and compared in terms of each quality dimension Y1 - 2025 ER - TY - CHAP A1 - Hochbrückner, Benedikt A1 - Langer, Felix A1 - Winkelmann, Erik A1 - Spiertz, Martin A1 - Zink, Markus A1 - Steiner, Thomas A1 - Krätzschmar, Karsten T1 - Application of a Cluster-Algorithm for Partial Discharge Analysis at DC Voltage Under Practical Conditions Y1 - 2021 U6 - https://doi.org/10.1049/icp.2022.0037 ER - TY - CHAP A1 - Hochbrückner, Benedikt A1 - Spiertz, Martin A1 - Küchler, Andreas A1 - Zink, Markus A1 - Steiner, Thomas A1 - Winkelmann, Erik A1 - Krätzschmar, Karsten T1 - Digital Filtering Methods for Interferences on Partial Discharges Under DC Voltage Y1 - 2020 SN - 978-3-030-31675-4 U6 - https://doi.org/10.1007/978-3-030-31676-1_53 SP - 560 EP - 571 ER - TY - CHAP A1 - Hochbrückner, Benedikt A1 - Küchler, Andreas A1 - Spiertz, Martin A1 - Krätzschmar, Karsten A1 - Zink, Markus T1 - Comparison of Algorithms for Clustering of Partial Discharge Signals under DC Voltage Y1 - 2019 U6 - https://doi.org/10.1109/ICHVEPS47643.2019.9011062 ER - TY - CHAP A1 - Spiertz, Martin T1 - Jupyter Notebooks in der Lehre T2 - Fortschritte der Akustik DAGA ’24 Y1 - 2024 ER - TY - CHAP A1 - Hariharan, Sai Gokul A1 - Kaethner, Christian A1 - Strobel, Norbert A1 - Kowarschik, Markus A1 - Albarqouni, Shadi A1 - Fahrig, Rebecca A1 - Navab, Nassir T1 - Learning-based X-ray image denoising utilizing model-based image simulations T2 - International Conference on Medical Image Computing and Computer-Assisted Intervention - MICCAI 2019, 22nd International Conference Shenzhen, China, October 13-17, 2019 Proceedings, Part VI Y1 - 2019 U6 - https://doi.org/10.1007/978-3-030-32226-7_61 SP - 549 EP - 557 PB - Springer International Publishing CY - Cham ER - TY - CHAP A1 - Hariharan, Sai Gokul A1 - Kaethner, Christian A1 - Strobel, Norbert A1 - Kowarschik, Markus A1 - DiNitto, Julie A1 - Fahrig, Rebecca A1 - Navab, Nassir T1 - Model-based motion artifact correction in digital subtraction angiography using optical-flow T2 - Bildverarbeitung für die Medizin 2019: Algorithmen - Systeme - Anwendungen. Proceedings des Workshops vom 17. bis 19. März 2019 in Lübeck Y1 - 2019 U6 - https://doi.org/10.1007/978-3-658-25326-4_31 SP - 146 EP - 151 PB - Springer Fachmedien CY - Wiesbaden ER - TY - JOUR A1 - Maximilian, Rosilius A1 - Spiertz, Martin A1 - Wirsing, Benedikt A1 - Geuen, Manuel A1 - Bräutigam, Volker A1 - Ludwig, Bernd T1 - Impact of Industrial Noise on Speech Interaction Performance and User Acceptance when Using the MS HoloLens 2 JF - Multimodal Technologies and Interaction Y1 - 2024 U6 - https://doi.org/10.3390/mti8020008 VL - 8 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Machin, Graham A1 - Bloembergen, P. A1 - Anhalt, Klaus A1 - Sadli, M. A1 - Saunders, P. A1 - Woolliams, E. A1 - Yamada, Y. A1 - Yoon, H. T1 - Practical implementation of the mise-en-pratique for the definition of the Kelvin above the silver point JF - International Journal of Thermophysics Y1 - 2010 UR - http://permalink.bibkatalog.de/BV013298193 IS - 31 SP - 1779 EP - 1788 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Khlevnoy, B. A1 - Rougie, B. A1 - Gibson, C. A1 - Yoon, H. A1 - Gaertner, A. A1 - Taubert, Dieter Richard T1 - CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm JF - Metrologia Y1 - 2009 UR - http://permalink.bibkatalog.de/BV012573233 IS - 46 SP - 174 EP - 180 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Krenek, S. A1 - Anhalt, Klaus A1 - Lindemann, A. A1 - Hollandt, Jörg T1 - A study on the feasibility of measuring the emissivity with the laser-flash method JF - International Journal of Thermophysics Y1 - 2010 UR - http://permalink.bibkatalog.de/BV013298193 IS - 31 SP - 998 EP - 1010 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Lindner, D. A1 - Krüger, U. T1 - Camera based investigation of high-temperature fixed-points for radiometric application JF - Metrologia Y1 - 2009 UR - http://permalink.bibkatalog.de/BV012573233 IS - 46 SP - 260 EP - 265 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Ojanen, M. A1 - Anhalt, Klaus A1 - Schiller, S. A1 - Weckström, T. A1 - Kärhä, P. A1 - Heinonen, M. A1 - Ikonen, E. T1 - Comparison of the radiation temperature scales between MIKES and PTB JF - Measurement Y1 - 2010 IS - 43 SP - 183 EP - 189 ER - TY - JOUR A1 - Höfflin, Dennis A1 - Sauer, Christian A1 - Schiffler, Andreas A1 - Hartmann, Jürgen T1 - Process Monitoring Using Synchronized Path Infrared Thermography in PBF-LB/M JF - Sensors N2 - Additive manufacturing processes, particularly Laser-Based Powder Bed Fusion of Metals (PBF-LB/M), enable the development of new application possibilities due to their manufacturing-specific freedom of design. These new fields of application require a high degree of component quality, especially in safety-relevant areas. This is currently ensured primarily via a considerable amount of downstream quality control. Suitable process monitoring systems promise to reduce this effort drastically. This paper introduces a novel monitoring method in order to gain process-specific thermal information during the manufacturing process. The Synchronized Path Infrared Thermography (SPIT) method is based on two synchronized galvanometer scanners allowing high-speed and high-resolution observations of the melt pool in the SWIR range. One scanner is used to steer the laser over the building platform, while the second scanner guides the field of view of an IR camera. With this setup, the melting process is observed at different laser powers, scan speeds and at different locations with respect to the laser position, in order to demonstrate the positioning accuracy of the system and to initially gain thermal process data of the melt pool and the heat-affected zone. Therefore, the SPIT system shows a speed independent overall accuracy of ±2 Pixel within the evaluated range. The system further allows detailed thermal observation of the melt pool and the surrounding heat-affected zone. KW - SPIT KW - PBF-LB/M KW - additive manufacturing KW - process monitoring KW - SWIR KW - melt pool KW - galvanometer scanner Y1 - 2022 U6 - https://doi.org/10.3390/s22165943 VL - 22 IS - 16 PB - MDPI ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Hollandt, Jörg A1 - Sakuma, F. A1 - Khlevnoy, B. A1 - Morozova, S. ED - Zhang, Z.M. ED - Tsai, B.K. ED - Machin, Graham T1 - Blackbody and other Calibration Sources, in Radiometric Temperature Measurements Part I Fundamentals T2 - Experimental Methods in the Physical Sciences Y1 - 2009 UR - http://permalink.bibkatalog.de/BV010604537 SN - 978-0-12-374021-2 VL - 42 SP - 241 EP - 295 PB - Elsevier Academic Press CY - Amsterdam ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Werner, L. A1 - Fischer, J. A1 - Johannsen, U. T1 - Accurate determination of the spectral responsivity of silicon trap detectors between 238 nm and 1015 nm using a laser-based cryogenic radiometer JF - Metrologia Y1 - 2000 UR - http://permalink.bibkatalog.de/BV012573233 IS - 37 SP - 279 EP - 284 ER - TY - CHAP A1 - Küchler, Andreas A1 - Reumann, Andreas A1 - Zink, M. A1 - Voll, S. A1 - Berger, Frank A1 - Langens, Achim A1 - Titze, J. T1 - Der Einfluss von Temperatur, Feldstärke und Atmosphäre auf die Alterung von OIP Hochspannungstransformatordurchführungen BT - ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel“ T2 - ETG-Fachbericht 134 Y1 - 2012 PB - VDE CY - Fulda ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. T1 - Measuring local thermal conductivity in polycrystalline diamond with a high resolution photothermal microscope JF - J. Appl. Phys. Y1 - 1997 UR - http://permalink.bibkatalog.de/BV013637659 IS - 81 SP - 2966 EP - 2977 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Fischer, J. A1 - Seidel, J. T1 - A non-contact technique providing improved accuracy in area measurements of radiometric apertures JF - Metrologia Y1 - 2000 UR - http://permalink.bibkatalog.de/BV012573233 IS - 37 SP - 637 EP - 640 ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Zink, M. A1 - Liebschner, M. A1 - Krause, Ch. T1 - Diagnosis of HVDC Insulation Systems by use of Oil-conductivity Measuring Methods T2 - 2012 IEEE International Conference on Condition Monitoring and Diagnosis CMD Y1 - 2012 SP - 23 EP - 27 CY - Bali, Indonesia ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Calibration and interpolation of the spectral responsivity of silicon photodiode based detectors JF - Sensors & Actuators A: Physical Y1 - 2009 UR - http://permalink.bibkatalog.de/BV013197638 IS - 156 SP - 185 EP - 190 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Klotzbücher, T. A1 - Reichling, M. T1 - Local variation of room temperature thermal conductivity in high quality polycrystalline diamond JF - Appl. Phys. Lett. Y1 - 1998 IS - 73 SP - 756 EP - 758 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Costello, M. A1 - Reichling, M. T1 - The influence of thermal barriers on heat flow in high quality chemical vapour deposited diamond JF - Phys. Rev. Lett. Y1 - 1998 IS - 80 SP - 117 EP - 120 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Bernhard, Frank ED - Bernhard, Frank T1 - Strahlungsthermometrie T2 - Technische Temperaturmessung Y1 - 2014 SN - ISBN 978-3-642-24505-3 PB - Springer ET - 2 ER - TY - CHAP A1 - Küchler, Andreas A1 - Zink, M. A1 - Voll, S. A1 - Berger, Frank A1 - Klipfel, V. T1 - Der Einfluss von Temperatur und Streukapazität auf diagnostische Kapazitäts- und Verlustfaktormessungen von 400 kV-Hochspannungstransformatordurchführungen BT - ETG-Fachtagung „Diagnostik elektrischer Betriebsmittel“ T2 - ETG-Fachbericht 134 Y1 - 2012 PB - VDE CY - Fulda ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Verhoeven, H. A1 - Reichling, M. A1 - Müller-Sebert, W. A1 - Zachai, R. T1 - Structural limitations to local thermal diffusivity of diamond films JF - Diamond and Related Materials Y1 - 1996 UR - http://permalink.bibkatalog.de/BV013364452 IS - 5 SP - 1012 EP - 1016 ER - TY - CHAP A1 - Küchler, Andreas A1 - Zink, M. A1 - Berger, Frank A1 - Klipfel, V. T1 - Electrical Simulation as a Tool for Ageing-condition Assessment of Generator Transformer Bushings T2 - 2012 IEEE International Conference on Condition Monitoring and Diagnosis CMD Y1 - 2012 SP - 23 EP - 27 CY - Bali, Indonesia ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Maznev, A.A. A1 - Reichling, M. T1 - Thermal wave propagation in thin films on substrates JF - J. Appl. Phys Y1 - 1995 UR - http://permalink.bibkatalog.de/BV013637659 IS - 78 SP - 5266 EP - 5269 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Langer, G. A1 - Reichling, M. T1 - Thermal conductivity of thin metallic films measured with the photothermal profile analysis JF - Rev. Sci. Instr. Y1 - 1997 IS - 68 SP - 1510 EP - 1513 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Reichling, M. A1 - Voigt, P. T1 - Quantitative thermal imaging of current densities and heat flow in electronic microstructures JF - Prog. in Nat. Sci. Y1 - 1996 IS - 6 SP - 519 EP - 523 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Reichling, M. A1 - Matthias, E. T1 - Thermoreflectance measurements of single thermal barriers in CVD-diamond JF - Prog. in Nat. Sci. Y1 - 1996 IS - 6 SP - 297 EP - 300 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. A1 - Matthias, E. T1 - Photothermal measurement of thermal anisotropy in pyrolytic graphite JF - Appl. Phys. B Y1 - 1996 IS - 62 SP - 493 EP - 497 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. T1 - Thermal wave imaging of electrically heated microstructures JF - J. Appl. Phys. Y1 - 1996 IS - 80 SP - 2013 EP - 2018 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Zipf, Matthias A1 - Stark, Thomas A1 - Arduini, Mariacarla A1 - Ebert, Hans-Peter A1 - Tutschke, Andreas A1 - Hallam, Andrew A1 - Hanspal, Jagdevinder A1 - Langley, Mark A1 - Hodge, D. T1 - Development of Long Wavelength Infrared Radiation Thermometry for Measurements in Gas Turbines BT - Key Note Lecture MSE 2016 Y1 - 2016 CY - Darmstadt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Machin, Graham A1 - Bloembergen, P. A1 - Anhalt, Klaus A1 - Sadli, M. A1 - Saunders, P. A1 - Woolliams, E. A1 - Yamada, Y. A1 - Yoon, H. T1 - Practical implementation of the mise-en-prtique for the definition of the Kelvin above the silver point BT - Tempmeko 2010 Y1 - 2010 CY - Portroz (Slowenien) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Zänglein, Marc A1 - Manara, Jochen A1 - Stark, Thomas A1 - Zipf, Matthias A1 - Arduini, Mariacarla A1 - Schreiber, Ekkehard A1 - Krüger, U. A1 - Schmidt, Franz A1 - Brunner, Martin T1 - Sensor systems for additive manufacturing Y1 - 2018 PB - Key Note Lecture MSE 2018 CY - Darmstadt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. ED - Nazaré, H. ED - Neves, A.J. T1 - Thermal characterization of diamond materials T2 - Properties and growth of diamond Y1 - 2001 UR - https://books.google.de/books?id=jtC1mUFZfQcC&printsec=frontcover PB - Institution of Electrical Engineers CY - London ER - TY - CHAP A1 - Zink, Markus H. A1 - Dotterweich, C. A1 - Hartmann, Jürgen A1 - Harrer, S. A1 - Hemberger, F. A1 - Ebert, Hans-Peter A1 - Schnitzler, Tim T1 - Phase Change Materials for Use in Thermally and Electrically Stressed Insulation for High Voltage Applications T2 - IEEE Electrical Insulation Conference Y1 - 2016 VL - 2016 SP - 605 EP - 608 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Hollandt, Jörg A1 - Taubert, Dieter Richard A1 - Werner, L. T1 - Optische Hochtemperaturmesstechnik für die Thermometrie, Radiometrie und Photometrie BT - Sensoren und Messsysteme 2010 Y1 - 2010 CY - Nürnberg ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Nilsson, O. A1 - Fricke, J. T1 - Thermal diffusivity measurements on two-layered systems with the laser-flash method JF - High Temp. - High Press Y1 - 1993 IS - 25 SP - 403 EP - 410 ER - TY - JOUR A1 - Ochs, Dennis A1 - Wehnert, Kira-Kristin A1 - Hartmann, Jürgen A1 - Schiffler, Andreas A1 - Schmitt, Jan T1 - Sustainable Aspects of a Metal Printing Process Chain with Laser Powder Bed Fusion (LPBF) JF - Procedia CIRP N2 - Production companies are getting more and more aware of the relevancy of energy costs and the environmental impact of their manufactured products. Hence, the knowledge about the energy intensity of new process technologies as metal printing becomes increasingly crucial. Therefore, data about the energy intensity of entire process chains allow a detailed assessment of the life cycle costs and environmental impact of metal printed parts. As metal printing with Laser Powder Bed Fusion (LPBF) is applied from rapid prototyping to serial manufacturing processes more and more, sustainability data are useful to support a valid scale-up scenario and energetic improvements of the 3D-printing machinery as well as peripheral aggregates used in the process chain. The contribution aims to increase the transparency of the LPBF process chain in terms of its energy consumption. Therefore a generalized model to assess sustainability aspects of metal printed parts is derived. For this purpose, the LPBF process chain with the essential pre-, main- and post-processes is evaluated regarding its energy intensity. Here, the sub-processes, for example wet and dry cleaning of the printer, sieving of the metal powder or sand-blasting of the part are analyzed as well as the main printing process. Based on the derived experimental data from an installed, industry-like process chain, a model is created, which tends to generalize the experimental findings to evaluate other metal printed parts and process chain variants in terms of their energy intensity. Y1 - 2021 UR - 10.1016/j.procir.2021.01.163 VL - 98 SP - 613 EP - 618 PB - Elsevir ER - TY - JOUR A1 - Arndt, Bernhard A1 - Popov, Artem A1 - Sayenko, Yuriy T1 - Investigation of voltage transformers operating modes in networks with insulated neutral terminal at non-symmetric modes JF - FHWS science journal N2 - Ferroresonance and processes at one-phase grounding inside networks with insulated neutral terminal are investigated. It is shown that the mode with unidirectional arc, at which direct current passed in high voltage windings is the most difficult operating mode for the transformer. The influence of the secondary voltage transformer load upon the stability of ferroresonance oscillations has been also investigated. KW - Ferroresonance KW - Magnetization curve KW - One-phase arc grounding KW - voltage transormer KW - zero-sequence capacity Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-964 VL - 2 (2014) IS - 1 SP - 8 EP - 15 ER - TY - JOUR A1 - Kranz, Philipp A1 - Schirmer, Fabian A1 - Kaupp, Tobias A1 - Daun, Marian T1 - Generative AI Copilot to Support Safety Analyses of Human–Robot Collaborations: Hazard Operability Analysis and GPT-4 JF - IEEE Software Y1 - 2024 U6 - https://doi.org/10.1109/MS.2024.3414445 SN - 0740-7459 VL - 41 IS - 6 SP - 65 EP - 72 PB - Institute of Electrical and Electronics Engineers (IEEE) ER - TY - CHAP A1 - Haggy, Abdelrhman A1 - Philip, Abel A1 - Jacob, Sneha A1 - Schneider, Juliane A1 - Anchukandan, Mohammed A1 - Kranz, Philipp A1 - Daun, Marian T1 - Safety Assessment of Human-Robot Collaborations Using Failure Mode and Effects Analysis and Bow-Tie Analysis T2 - Proceedings of the 21st International Conference on Informatics in Control, Automation and Robotics Y1 - 2024 U6 - https://doi.org/10.5220/0013017500003822 SP - 432 EP - 439 PB - SCITEPRESS - Science and Technology Publications ER - TY - JOUR A1 - Küchler, Andreas A1 - Bellm, H. A1 - Herold, J. A1 - Schwab, A. T1 - Rogowski-Spulen und Magnetfeldsensoren zur Messung transienter Ströme im Nanosekundenbereich BT - Teil 1 JF - Archiv für Elektrotechnik Y1 - 1985 UR - http://permalink.bibkatalog.de/BV013241178 VL - 68 SP - 63 EP - 68 ER - TY - JOUR A1 - Küchler, Andreas A1 - Bellm, H. A1 - Herold, J. A1 - Schwab, A. T1 - Rogowski-Spulen und Magnetfeldsensoren zur Messung transienter Ströme im Nanosekundenbereich BT - Teil 2 JF - Archiv für Elektrotechnik Y1 - 1985 UR - http://permalink.bibkatalog.de/BV013241178 VL - 68 SP - 69 EP - 74 ER - TY - CHAP A1 - Küchler, Andreas A1 - Leibfried, T. A1 - Kachler, A.J. A1 - Zängl, W.S. A1 - Der Houhanessian, V. A1 - Breitenbauch, B. T1 - Ageing and Moisture Analysis of Power Transformer Insulation Systems BT - CIGRÉ 2002 T2 - International Council on Large Electric Systems Y1 - 2002 SP - 12 EP - 101 CY - Paris ER - TY - JOUR A1 - Küchler, Andreas A1 - Dams, J. A1 - Dunz, Th. A1 - Schwab, A. T1 - Kapazitive Sensoren zur Messung transienter elektrischer Felder und Spannungen JF - Archiv für Elektrotechnik Y1 - 1985 UR - http://permalink.bibkatalog.de/BV013241178 VL - 68 IS - 1985 SP - 335 EP - 344 ER - TY - JOUR A1 - Küchler, Andreas A1 - Epping, W. A1 - Schwab, A. T1 - Elektrische Feldstärkemessung mit doppelbrechenden und optisch aktiven Kristallen JF - Archiv für Elektrotechnik Y1 - 1984 UR - http://permalink.bibkatalog.de/BV013241178 VL - 67 SP - 329 EP - 339 ER - TY - CHAP A1 - Küchler, Andreas A1 - Dams, J. A1 - Dunz, Th. A1 - Epping, W. A1 - Kunz, H. A1 - Schwab, A. T1 - Kerr-Effect Measurements of Pulsed Electric Fields in Water T2 - 5th IEEE Pulse Power Conf. Y1 - 1985 CY - Arlington VA, USA ER - TY - CHAP A1 - Küchler, Andreas A1 - Dams, J. A1 - Dunz, Th. A1 - Schwab, A. T1 - Design and Operation of a Tera-Watt Pulse-Power Generator T2 - 5th ISH Int. Symp. on High Voltage Engineering Y1 - 1987 SP - 02 EP - 61 CY - Braunschweig ER - TY - THES A1 - Schmitt, Maximilian A1 - Petzoldt, Jürgen A1 - Ackva, Ansgar A1 - Stadler, Alexander T1 - Aktive Dämpfung von Gleichtaktstörungen in elektrischen Antriebssystemen N2 - Die vorliegende Arbeit beschäftigt sich mit der Entstehung und Wirkung von Gleichtaktstörungen in elektrischen Antriebssystemen. Parasitäre Gleichtaktimpedanzen bilden zusammen mit Gegentaktimpedanzen des Antriebssystems parasitäre Resonanzschwingkreise aus, welche von den Schalthandlungen der eingesetzten Umrichter im Antriebssystem zum Schwingen angeregt werden. Einer der beiden Schwerpunkte befasst sich mit der Entwicklung einer analytischen Berechnungsmethode, um die vorhandenen parasitären Gleichtaktpfade sowie deren Resonanzfrequenzen zu ermitteln. Der zweite Schwerpunkt behandelt die Möglichkeit der aktiven Dämpfung von Gleichtaktstörungen. Hierzu analysiert ein Algorithmus jede einzelne Schaltflanke im Umrichter auf deren Wirkung im Gleichtaktsystem. Anschließend kann diese zeitlich derart verschoben werden, dass die Schaltflanke eine bestmögliche Dämpfung im Gleichtaktsystem erzielt. Einleitend werden die notwendigen Grundlagen zur Umrichtertechnik sowie der Ausbildung und Anregung von Resonanzschwingkreisen am Beispiel eines RLC-Reihenschwingkreises erklärt, der stellvertretend für das stark reduzierte Gleichtaktmodell eines modernen Antriebssystems steht. Die Literaturrecherche gibt einen detaillierten Einblick über aktuelle Methoden der Reduktion von Gleichtaktstörungen wieder. Viele wissenschaftliche Veröffentlichungen behandeln modifizierte Ansteuerverfahren für die eingesetzten Umrichter, welche gezielt die Gleichtaktspannungen eines jeden Spannungsraumzeigers ausnutzen. Die Theorie und Funktionsweise des neuen Steuerverfahrens HCad, wird mathematisch hergeleitet und anhand eines idealen Simulationsmodells untersucht. Die Auswertung der Simulationsergebnisse ermöglicht es bereits, die dämpfende Wirkung unter idealen Bedingungen zu quantifizieren. Die Umsetzung eines praxisnahen Laborprüfstands dient der Verifikation und dem Vergleich realer Messungen mit den in der Simulation gewonnen Erkenntnissen. Die durchgeführten Messreihen bestätigen die Möglichkeit, Gleichtaktstörungen mithilfe einer zeitlichen Flankenverschiebung im Umrichter zu bekämpfen. Des Weiteren ist gezeigt, dass die Anwendung der aktiven Gleichtaktdämpfung neben der eigentlichen Aufgabe eines Steuerverfahrens in vollem Umfang und über den kompletten Modulationsbereich eines Umrichters möglich ist. KW - Elektroantrieb KW - Aktive Schwingungsdämpfung KW - Gleichtaktstörung KW - Antrieb (Technik) KW - Dämpfung KW - Umrichter KW - Gleichtaktspannung KW - Impedanz Y1 - 2020 UR - https://www.db-thueringen.de/receive/dbt_mods_00042672 PB - TU Ilmenau CY - Ilmenau ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Zipf, Mathias A1 - Stark, Thomas A1 - Knopp, Kevin A1 - Zänglein, Marc A1 - Lenski, Philipp A1 - Schreiber, Ekkehard A1 - Schmidt, Franz A1 - Brunner, Martin A1 - Müller, Michael T1 - Thermophysical property measurements at high-temperatures for power engineering and additive manufacturing processes BT - QIRT 2018, 25 - 29 June 2018, Berlin, Germany N2 - To address the needs for increasing efficiency in power conversion, stratified structures like thermal barrier coatings, are used to increase operation temperature. Also advanced material processing like 3D laser printing of metals and ceramics are based on a layer-to-layer process at high temperatures, resulting in non-homogeneous components. Both systems require more and more detailed investigation methods to characterise the material properties of the resulting structures and to optimize the relevant processes. To address the required needs in advanced material characterisation recently an attempt was started to develop a unique measurement set-up for advanced material characterisation. This method is based on the well know laser flash principle, which was improved by adding supplementary heating sources and additional detection channels. Combining different heating mechanism and heating times with the two-dimensional measuring of the thermal flow across the sample enables the determination of different opto-thermal parameters and other material properties, e.g. mechanical contact, electrical conductivity or optical data, which also depend on or affect the flow of heat. In this paper we describe the implementation of the different optical methods to measure the thermal heat flow by point-like and two-dimensional temperature measurement and present first results on several samples. KW - thermophysical property measurement KW - additive manufacturing process Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-17678 SN - 978-3-940283-94-8 CY - Berlin ER - TY - JOUR A1 - Jürgen, Hartmann A1 - Arduini, Mariacarla A1 - Manara, Jochen A1 - Stark, Thomas A1 - Ebert, Hans-Peter T1 - Development and Evaluation of an Improved Apparatus for Measuring the Emissivity at High Temperatures JF - Sensors N2 - An improved apparatus for measuring the spectral directional emissivity in the wavelength range between 1 µm and 20 µm at temperatures up to 2400 K is presented in this paper. As a heating unit an inductor is used to warm up the specimen, as well as the blackbody reference to the specified temperatures. The heating unit is placed in a double-walled vacuum vessel. A defined temperature, as well as a homogenous temperature distribution of the whole surrounding is ensured by a heat transfer fluid flowing through the gap of the double-walled vessel. Additionally, the surrounding is coated with a high-emitting paint and serves as blackbody-like surrounding to ensure defined boundary conditions. For measuring the spectral directional emissivity at different emission angles, a movable mirror is installed in front of the specimen, which can be adjusted by a rotatable arrangement guiding the emitted radiation into the attached FTIR-spectrometer. The setup of the emissivity measurement apparatus (EMMA) and the measurement procedure are introduced, and the derived measurement results are presented. For evaluating the apparatus, measurements were performed on different materials. The determined emissivities agree well with values published in literature within the derived relative uncertainties below 4% for most wavelengths. KW - emissivity KW - reflectivity KW - infrared radiation KW - high temperature KW - Temperatur KW - Emissivität Y1 - 2021 UR - https://www.mdpi.com/1424-8220/21/18/6252 U6 - https://doi.org/10.3390/s21186252 SN - 1424-8220 VL - 21 IS - 18 ER - TY - CHAP A1 - Küchler, Andreas A1 - Schober, F. A1 - Krieg, A. A1 - Liebschner, M. A1 - Berger, Frank T1 - Parameter influences on HVDC transformer insulation and its link to conduction processes T2 - 32nd International Conference “Science in Practice” Y1 - 2014 CY - Osijek, Croatia ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Litorja, M. A1 - Fowler, J. A1 - Fox, N. A1 - Stock, M. A1 - Razet, A. A1 - Khlevnoy, B. A1 - Ikonen, E. A1 - Machacs, M. A1 - Doytchinov, K. T1 - Final report on the CCPR-S2 supplementary comparison of area measurements of apertures for radiometry JF - Metrologia Y1 - 2007 UR - http://permalink.bibkatalog.de/BV012573233 VL - 44 IS - 02002 ER -