关键词: 声学；有限元法；流体&mdash, 结构耦合；P/T灵敏度；悬置动刚度

Abstract:

It’s very important to calculate the sound pressure in vehicle from the powertrain torque excitation for advanced vehicle development. In this paper, a detailed full vehicle structure model and a fluid cavity model was built with FE method, and the coupled fluid-structure equations was derived. The model was validated with the method of modal assurance criterion. Based on the models，the sensitivity of sound pressure over toque, which is called P/T, was calculated. In 30-100Hz, the simulation result had a good consistency with the test result, but not in 10-30Hz. The simulation and tests of mount isolation and powertrain rigid body modes were completed and the results were analyzed. The influence of mount dynamic-stiffness characteristics on P/T was proved. Finally, when the mount dynamic stiffness value was increased, the P/T simulation and tests had a good consistency in the whole band of 0-100Hz.