Research On Interior Noise Prediction And Improvement Of Battery Electric Vehicle Based On Road Excitation

With the promotion and popularization of battery electric vehicles,more and more consumers begin to accept battery electric vehicles,and put forward new requirements on the comfort of battery electric vehicles.Due to the lack of masking effect of engine noise,battery electric vehicles show unique noise characteristics,such as road noise,wind noise and electric drive system noise.Among them,the road noise of battery electric vehicle is the key factor to reduce the ride comfort.Therefore,how to reduce the in-vehicle noise caused by road excitation becomes the key to the development of vehicle NVH performance.In this paper,the interior noise of pure electric vehicle under the action of road excitation force is analyzed and optimized.Firstly,the mechanism of road noise and the multiple correlation analysis method are expounded.The multiple coherence analysis method is used to decompose the interior noise,and the difference between the interior noise of pure electric vehicles and traditional fuel vehicles is analyzed.The main working conditions of road noise evaluation of pure electric vehicles are proposed.Secondly,the principle of principal component analysis(PCA)and inverse matrix method is expounded.Before analyzing the road noise transfer path,PCA is used to decouple the partially correlated road excitation into irrelevant single excitation path input.Inverse matrix method is used to transfer path analysis of decorative body,and the fitting results compared with the actual road test verification,verify the validity of the model,and finally to extract the road excitation load,test will be collected road exciting force loading to verify after the analysis on the simulation model,predict the actual pavement response under the interior noise of forces.Based on the acoustic-solid coupling model of trimmed body,this paper analyzes the reasons of the predicted noise problems by means of the noise transfer function,the analysis results of the coupled point dynamic stiffness and the engineering experience indexes,the optimization scheme is verified and proved to be effective and feasible.Using the validated simulation model to forecast analysis,can ensure the precision of calculation result is credible,thereby reducing development cycle time and the performance of road noise can avoid the late and produce the high cost of calibration optimization larger risk problem,through the study of technology for the development of road noise provides a complete technology development route.