SAE International Vibration Transmission Analysis of Automotive Body for Reduction of Booming Noise 2011-01-1691

This paper presents progressive techniques based on the previous SAE papers [ 1 ], [ 2 ] for vibration transmission analysis (VTA) on finite element (FE) model using Transfer Path Analysis (TPA). The techniques are: 1) a contribution calculation technique for structure with manifold and continuous transfer paths: 2) a visualization technique of the influence degree for efficient derivation of measures for response reduction. In VTA, influence degree of each DOF is calculated based on TPA. In order to understand characteristics of vibration transmission (VT) easily and visually by engineers, magnitude of influence degree is expressed by replacement to magnitude of displacement in the diagram of FE vibration shape. This visualization technique is applied to an automotive body structure. The proposed techniques are applied to automotive body structure consisting of members and panels. The members are such as pillars, cross members and side members, which are the main VT paths. The panels are such as windshield and roof panel, where vibration is considered as propagating among the members. This application validates the effectiveness and usefulness of the proposed approach.