关键词: 声学, 路面不平度, 发动机激励, 声学贡献分析, 阻尼降噪

Abstract: Based on the theory of multi-body system dynamics and the analytical method of finite element and boundary element, the finite element model of vehicle body, the rigid-flexible coupled model of vehicle and the acoustic boundary element model of carriage were established by applying a variety of simulation softwares. Road roughness and engine vibration were simulated and the SPL of field points in carriage under these excitations were computed at the frequency range of 20-150Hz. Considering the size and the positive /negative nature of panels’ acoustic contribution at SPL peak of field points, damping treatments were taken on different combinations of panels to decrease multiple field points’ SPL peak and the optimal treatment was finally confirmed. The results show that the amplitude and frequency distribution of the field point SPL peak are related to the frequency distribution of the exciting force’s energy and structural modal. The frequency distribution of SPL will be changed by adhesiveing damping materials, which can reduce noise at the same time. The noise reduction measures can generally decrease the SPL peak around the Crew.