The present study concerns the application of Transmissibility method to automotive NVH source path contribution problems, specially focusing on the air-borne applications. Continuing the previous study, the present one addresses the validation of the method on the data measured on a real car equipped with Engine Noise Simulator. A brief theoretical introduction to the method is done where the method is compared with Matrix Inversion method which is well-known for NVH engineers. It is shown that the quality of the results from the Transmissibility method is very much depend on a matrix defining FRFs between sources and indicators, and therefore, the calculated contributions are very much influenced by the position of indicator sensors. It is also shown why the sum of contributions calculated by the method is always in a good agreement with the measured noise at the receiver position. It is also shown that if the indicator sensors are placed very close to the expected sources, the method can produce good results, both from source separation view point and overall source strength view point. This was demonstrated for two sets of target operating measurements and two calculation domains.
Application of transmissibility matrix method to NVH source contribution analysis
2009
10 Seiten, 6 Bilder, 13 Quellen
Conference paper
English
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