TY - GEN A1 - Hoever, Carsten A1 - Kropp, W. A1 - Petersson, B.A.T. T1 - Active structural control of impacts with a view towards noise control T2 - NAG/DAGA 2009 - International Conference on Acoustics CY - Rotterdam, The Netherlands DA - 2009-03-23 KW - Acoustics KW - Noise control KW - Impacts KW - Active control PY - 2009 SN - 978-3-9808659-6-8 IS - Active noise control 2 SP - 1216 EP - 1219 AN - OPUS4-20466 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Buchholz, Uwe A1 - Jaunich, Matthias A1 - Stark, Wolfgang A1 - Habel, Wolfgang A1 - Petersson, B.A.T. T1 - Acoustic data of cross linked polyethylene (XLPE) and cured liquid silicone rubber (LSR) by means of ultrasonic and low frequency DMTA N2 - Partial discharges may cause damage to electrical insulation of high voltage equipment. They initiate elastic waves in the insulating material, e.g. in the stress cone of an outdoor termination. Localisation of the origin of such elastic waves can help to predict serious damaging processes in the electrical insulation. In order to measure and evaluate the wave propagation effects in typical multilayered elastomeric structures, knowledge of the material properties is required. The propagating velocity and the attenuation of longitudinal waves are important parameters. Values for these quantities found in the literature were not appropriate. Therefore, for cross-linked polyethylene (XLPE) and cured liquid silicone rubber (LSR), the longitudinal wave velocity and the attenuation were evaluated in the temperature interval from -20°C to 50°C and in the frequency range from 200 kHz to 600 kHz using a two-sample ultrasound technique. The loss factor was determined from these measured quantities. Additionally, low frequency Dynamic Mechanical Thermal Analysis (DMTA) was applied to investigate LSR and XLPE in a temperature interval between -100 and 50°C and to check qualitatively the ultrasound data. KW - Acoustic propagation KW - Cross linked polyethylene insulation KW - Mechanical variables measurement KW - Silicone rubber PY - 2012 U6 - https://doi.org/10.1109/TDEI.2012.6180250 SN - 1070-9878 SN - 0018-9367 SN - 1558-4135 VL - 19 IS - 2 SP - 558 EP - 566 PB - Institute of Electrical and Electronics Engineers CY - New York, NY AN - OPUS4-26106 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Prager, Jens A1 - Petersson, B.A.T. T1 - Improving the statistical wave field description using the Waterhouse correction N2 - The diffuse field assumption employed in basic statistical energy analysis (SEA) and in statistical room acoustics is violated for source and receiver positions close to boundaries or discontinuities. A simple approach is proposed to include the correction initially suggested by Waterhouse based on spherical Bessel functions in SEA predictions for rectangular rooms. With this modification the SEA results will be augmented by a position dependence and an additional frequency dependence. The approach is applied and demonstrated also for plate-like structures with different boundary conditions. An analytical solution is shown for the corner position on a simply supported plate and for edge positions on plates with more complex boundary conditions. The validity of the approach is confirmed by means of comparisons with modal analysis and finite element calculations. KW - Acoustic wave propagation KW - Acoustic wave scattering KW - Architectural acoustics KW - Bessel functions KW - Statistical analysis PY - 2010 U6 - https://doi.org/10.1121/1.3397453 SN - 0001-4966 SN - 1520-8524 VL - 128 IS - 1 SP - 20 EP - 27 PB - American Institute of Physics CY - Melville, NY AN - OPUS4-21946 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Buchholz, Uwe A1 - Petersson, B.A.T. ED - Marinus M. Boone, T1 - Investigation of the sound transmission of a partial discharge through a solid dielectric multilayered device N2 - Acoustic emission (AE) sources caused by partial discharges in solid dielectric devices like transition joints or outdoor terminations are investigated. Together with a prepared high voltage cable end this device forms a multilayer structure. The hypothesis is that due to the high damping of polymeric insulation materials no AE signal can be detected on the surface of the prescribed structures. An analytical technique is used to determine the transmission for a typical multilayer insulation. For quantitative computations it is necessary to know the material properties such as complex Young´s modulus, density and the Poisson´s ratio. Since the properties found in the literature were not fully satisfactory, measurements had to be done. The experimental setup and the results are shortly presented. Finally it will be shown that the transmission path plays not the significant role as was assumed in the beginning. T2 - International Conference on Acoustics - NAG/DAGA 2009 CY - Rotterdam, The Netherlands DA - 2009-03-23 PY - 2009 SN - 978-3-9808659-6-8 SP - 844 EP - 846 AN - OPUS4-19519 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Prager, Jens A1 - Petersson, B.A.T. ED - Mace, Brian R. ED - Ferguson, Neil S. ED - Rustighi, Emiliano T1 - Improvements on the statistical sound field description using waterhouse correction N2 - The diffuse field assumption employed in Statistical Energy Analysis (SEA) and in statistical room acoustics is violated for source and receiver positions close to boundaries or discontinuities. An approach is suggested to include the correction made by Waterhouse based on spherical Bessel functions in SEA predictions. With this modification the SEA results will be augmented by a position dependence and an additional frequency dependence. The approach is extended and demonstrated for plate-like structures with different boundary conditions. The validity of the approach is confirmed by means of comparisons with modal analysis and finite element calculations. T2 - NOVEM 2009 - Noise and Vibration: Emerging Methods CY - Oxford, UK DA - 2009-04-05 KW - SEA PY - 2009 IS - Contributed Papers / Chapt. 5 SP - 042-1 - 042-8 AN - OPUS4-20586 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Buchholz, Uwe A1 - Petersson, B.A.T. T1 - Computation of the surface velocity of a cylindrical layered dielectric device caused by partial discharges T2 - DAGA 2010 - 36. Jahrestagung für Akustik CY - Berlin, Deutschland DA - 2010-03-15 PY - 2010 SN - 978-3-9808659-8-2 SP - 153 EP - 154 CY - Berlin AN - OPUS4-21354 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -