Analysis And Optimization Of Twist Beam Suspension

Suspension K&C characteristic is very significant factor in driving performance like vehicle handling and ride comfort. Especially at high speeds, the dynamic behavior of suspension system will change the wheel location parameters, and it will impact on the driving stability of vehicle. The Twist Beam suspension is widely using in class A and class AO car because it has simple structure, low cost, and a lot of advantages in the kinematical. With the development of computer simulation technology, the finite element method and the multi body system dynamics method can be used in analysing the Twist Beam suspension. Rigid-elastic coupling model of the Twist Beam suspension can meet the accuracy requirements of the vehicle dynamics analyse. Optimizing the Twist Beam suspension characteristics is an important means of developing in car chassis system. In this paper, with the A-class car platform project in zhe unit I study the Twist Beam suspension.First, the Twist Beam suspension bushing rubber material characteristics is studied and simplied by using the finite element method, and proved by experiment. The constitutive models and characteristics of rubber are introduced in this paper. In the actual operating conditions of rubber bushing, the simplified finite element modeling method of rubber bushing is deduced. The simplified modeling bushing is tested in the unit. Comparison of calculated results with test data shows the simplified model accuracy can meet the engineering need.Then, from the view of multibody dynamics, the influence of the Twist Beam suspension geometry on suspension characteristic is studied. Mode analysis and test of the twist beam assembly are compared. The precision of the twist beam assembly finite element model is verificated. Through comparing K&C analysis and K&C test of the Twist Beam suspension characteristics, the precision of the rigid-elastic coupling Twist Beam suspension dynamic model is verificated. The effect of the twist beam position on suspension characteristics is studied, and the reasons are analyzed.Finally, the method of the Twist Beam suspension characteristics multidisciplinary integrated multi-objective optimization is studied. The optimization is carried out from two aspects, one is the section size of the twist beam, another is the angle and stiffness of bushing that connects Twist Beam suspension and vechile body. Integrated3D structure design, finite element method, multi-body dynamics and optimization technique, the twist beam cross section dimensions are optimized. The bushing stiffness and angle of the Twist Beam suspension are optimized in the multi-objective optimization. The suspension performance is greatly improved. It can provide a method for vehicle chassis performance development.