Lightweight Research Of A BEV Based On FEA Body NVH Performance Control

With the improvement of people's living standard and the increasing demand for automobiles,automobile lightweight has become one of the key technologies of major main engine factories in the process of automobile research and development.Automobile lightweight not only saves costs,but also contributes to the increasingly serious environmental problems.At the same time,in order to make passengers have a comfortable and comfortable driving environment,how to effectively reduce the quality of the whole vehicle to achieve light weight? Quantification and reduction of vehicle interior vibration and noise has become an urgent problem for major automobile manufacturersTo quantify and reduce vibration and noise of the car,has become the major automobile manufacturers urgent problems.Dynamic stiffness,TB body based on transfer function analysis of transfer path,according to vehicle performance objectives to implement lightweight purposes,and finally put forward more reasonable measures to reduce vibration and noise.The main contents of this paper are as follows:1.This paper introduces the analysis of NVH and its theory,and establishes a finite element model of BIW(body in white)for a new energy vehicle.Based on this model,the finite element analysis is carried out.2.The modal and torsional stiffness of the initial BIW are analyzed,the modal distribution of the BIW is analyzed,and the torsional stiffness of the body is optimized.3.Modal,bending and torsion stiffness analysis and optimization are carried out for TB body,which points out the direction for improving the overall performance of the body.4.The dynamic stiffness of the main attachment points between the initial BIW and the chassis is analyzed,and the dynamic stiffness performance of the key points is studied.Based on the dynamic stiffness values of the key points,optimization suggestions are put forward to provide reference for the results of the subsequent body transfer function.5.Vibration and noise transfer functions of the initial interior body are analyzed,and the NTF(noise transfer function)and VTF(vibration transfer function)are optimized by the analysis results,which verifies the rationality of the NVH performance of the vehicle.6.The sensitivity of the bending stiffness and torsional stiffness of the body-in-white is analyzed by using the thickness of the body panel structure,and the lightweight target is initially established.In this paper,aiming at controlling the NVH performance of the whole vehicle and lightening the sheet metal thickness of the body,a new energy vehicle is taken as the research object.The research is carried out from the following aspects: the finite element model of the whole vehicle,the modal,the structural stiffness of the whole vehicle,the dynamic stiffness of the key attachment points,the calculation of the contribution of each transfer path,and the lightening of the whole vehicle structure based on the NVH performance.It can provide reference basis for the development and design stage of the source vehicle,for the subsequent test adjustment,and has important practical guiding value for saving cost and development time as well as vibration control in the vehicle.