Prediction and Control of Structure-borne Noise for Fuel Cell Vehicle Based on FEM/BEM

Abstract:

In this study,the FCV (fuel cell vehicle) structure-borne noise reduction by the control of body vibration based on FEM/BEM is studied.As to acoustic analysis,in order to get the dynamic behavior of the auto-body structure,a frequency response of body structure is calculated by using FEM.And then,the pressure response of the interior acoustic domain is solved by boundary element method(BEM).Test results show good agreement with simulation results and the error analysis between those is made.As to body panel noise contribution analysis (PNCA),the thoughts and principles of PNCA are set forth and analyzed.Then,the governing principle of selected frequency is determined.Based on the above analysis,PNCA is carried out to point out the direction for body panel improvement.At last,constrained damping treatments are adopted to control body panel vibration.Based on PNCA results,the panel modifications are developed and validated virtually by the above-mentioned method.The simulation results show that the amplitude of low-frequency interior noise reduces and the control of rear seat and front floor improves in FCV structure-borne noise reduction.