Simulation to design car interior trims based on NVH performance

The simulation method to design car interior trims based on NVH performance is introduced in this paper. An SEA (statistical energy analysis) model with all the parameters was built based on a domestic car. The inputs of interior noise were got by the combination method of roads testing and other simulations. The sound pressure levels in the engine bay and at driver¿s ear in some running conditions were measured. And the inputs to auto-body from engine mounts were also measured. The aerodynamic pressure and suspensions inputs to panels in high speed were simulated. The accuracy of this model was validated by the results of software. Then, the simulation expressed that the interior high noise of a car can be reduced by adding the sound insulation and absorption in interior trims design. The research of this paper covered all the effects of aerodynamics, engine inputs and the suspensions inputs together. The interior trims design is very significant to improve the NVH (noise vibration & harshness) performance using SEA simulation. And the research of this paper can be used to direct the application of trims materials in car interior trims design.