Optimized Design And Performance Analysis For Twist Beam Rear Suspension Of Electric Car

In recent years,with people’s attention to environmental issues,countries around the world are advocating green travel.Electric vehicle because of its green environmental protection,low pollution characteristics has become the best choice to replace the traditional fuel vehicles.Most electric cars are developed on the basis of traditional fuel vehicles.And the structural characteristics of the electric car itself makes the quality of the non spring load change,which directly affects the performance of the disk.Suspension is an important part of the automobile chassis system,which has a very important influence on the ride comfort and handling stability of the vehicle.In view of this change,in this paper,a domestic independent electric vehicle project based on the rear torsion beam suspension system most commonly used for performance analysis and optimization.Based on the mufti-body system dynamics,the whole vehicle model is built,and the process of the performance analysis and optimization of the rear suspension torsion beam is studied in detail.Finally meet the structural performance requirements under the premise of achieving weight loss 2.01 kg,weight loss rate of 21.8%,the optimization effect is significant.In this paper,the performance analysis and development of key components of automobile chassis are studied by the method of modal and strength stiffness and fatigue life simulation analysis.Provide reference for automobile chassis design,and provide technical basis for the design and development of automobile chassis.The contents of this paper are as follows:Firstly,the multi-body dynamics model of the torsion beam suspension and the whole vehicle is established.According to the virtual prototype model of the vehicle,the load of torsion beam suspension and wheel center,body,spiral spring and vibration damper connecting four typical working conditions are extracted.According to the mechanics principle,the load on the connecting point of the suspension is calculated under differentworking conditions,and the method is innovative,which is more close to the actual driving conditions.Then,according to the design parameters and the finite element theory,the finite element model of torsion beam suspension is established.By comparing the results of the modal analysis and the modal test results,the precision of the finite element model of the torsion beam suspension is verified.On the basis of this,the strength and stiffness and fatigue life of the torsion beam are analyzed.By using the uniform test method and response surface method,the optimization of the rear suspension torsion beam is improved,and the design parameters are avoided.Finally,the structure and performance of the torsion beam were compared and analyzed.The results show that the performance of the torsion beam suspension can meet the requirements of the structural optimization.