Control of structure-borne noise for a vehicle body by using power flow analysis and acoustic path participation method

Abstract

This paper is aimed to analyze and control the structure-borne noise of a vehicle body by using the power flow and acoustic path participation method. The modal test is conducted to calibrate the simulation model, and the sound pressure frequency response analysis is carried out to obtain the critical frequencies. The power flow through the interface of the powertrain and vehicle body is analyzed. Then the main paths are identified. Before carrying out an acoustic path participation analysis, the coupled energy of the vibration transfer path was evaluated. For a decoupled vibration system, the sound pressure synthesis method of the multi-path vibration transmission is proposed. The relative errors between the synthetized sound pressure and the finite element calculated sound pressure are small. The interaction mechanisms between the power flow of a path, the acoustic participation of a path and the control characteristics are investigated. The results indicate that, the positive power flow is reduced by pertinently optimizing the stiffness parameters of the engine mounts. The acoustic participation of the corresponding path decreases and the structure-borne noise gets controlled.