Inverse transfer path analysis, a different approach to shorten time in NVH assessments

Abstract

This paper presents the design and implementation of a simplified method, based on the transmissibility concept, for a noise path assessment, which allows a rapid and accurate analysis. The Inverse Transfer Path Analysis aims to assess, and determine, the contribution of the critical paths, which are transmitting 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. The proposed 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. This publication introduces a novel NVH method proposed to study and identify noise transfer paths in a car structure. The theoretical approach of the methodology, practical implementation, and obtained results, are described in this work, as well as a methodology validation, to evidence the suitability of the proposed method.