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Inverse Transfer Path Analysis (ITPA), a methodology to save time in NVH assessments on electric cars Abstract:
The Inverse Transfer Path Analysis aims to assess, and determine, the contribution of the critical paths, which are transmitting car structure-borne noises and vibrations, from the vehicle’s vibration sources to the driver’s ear. The cabin noise transfer function, from the involved attachment points and directions, can be simultaneously obtained by applying an impulsive noise source inside the cabin. This approach avoids the use of other time consuming classic procedures. This methodology includes two types of tests, static condition tests in a semi-anechoic chamber and operational tests on a roller bench. The results assessment comprises the analysis of the noise contribution of each path, depending on the frequency and the vehicle speed range. The NVH method presented here is proposed to study, identify and quantify noise transfer paths in a car structure. |