Optimization Of A BEV Body Structure And Improvement Of NVH Performance Based On HyperWorks

The vehicle’s power source part,power transmission part,and the vibration of wheels is the main source of noise in the car.The vibration and noise generated by these parts pass into the cab through the body,which will directly affect the comfort of the ride.Since the beginning of the 21 st century,with the continuous enhancement of China’s national strength and the continuous improvement of people’s living standards,family cars are no longer a traditional means of transportation.Consumers pay more attention to the comfort and safety of vehicles,and the stability of handling.The evaluation index of automobile comfort is the NVH performance of the car.The stronger the NVH performance of the car,the better the comfort.At present,the competition of China’s major automobile manufacturers is continuously intensified.In order to improve the competitiveness of brands,major manufacturers are constantly increasing their research and development on comfort.This paper focuses on the problem that when a certain OEM develops an electric vehicle,its NVH performance does not reach the expected target and puts forward some solutions to meet the market requirements for new electric vehicles.This article is based on the powerful simulation and post-processing functions of Hyper Works software to model and simulate a newly developed electric vehicle.In the first few chapters of the paper,the basic situation of the Hyper Works software is introduced in turn.Hyper Mesh,solver Opti Struct,and postprocessing software Hyper View are briefly introduced,and the basic theory of finite element and NVH are described in detail.In this paper,before solving engineering problems,first use Hyper Mesh to mesh and model the body-in-white and interior bodywork,then analyze the structural characteristics of the body-in-white,including modal analysis and stiffness analysis,and then analyze the body-in-white and powertrain Perform dynamic stiffness analysis with the main connection part of the suspension.After analyzing the structural characteristics of the body-in-white,the acoustic-solid coupled finite element model of the interior body was established.The acoustic-solid coupled finite element model of the interior body and its structural model were one-to-one corresponded by means of node mapping.The sound pressure value of the driver’s right ear was analyzed,and the acoustic cavity modal of the interior body was analyzed.Combined with the modal of the interior body,the body parts that contributed a lot to the interior noise were analyzed through the noise transfer function.The structure of these parts was optimized to improve the NVH performance of the body.This paper takes a new electric vehicle developed by a main engine factory as the research object.For the purpose of improving the NVH performance of the vehicle,the finite element model of the body-in-white and interior was built with Hyper Works software,the solution was solved with Opti Struct solver,and the solution results were visualized with Hyper View.Through the analysis of the whole vehicle mode,stiffness and acoustic cavity mode,the body parts that have a greater impact on the performance of the vehicle NVH are analyzed,and then the optimization design is carried out to improve the sound quality of the vehicle.