Impact Analysis Of Multi-link Suspension Structure Parameters On Vehicle Handling And Stability

A good handling and stability of vehicle is required in modern vehicle design. The design of suspension structure parameters play an important role on suspension kinematics characteristic and handling and stability. In this paper, models of suspension assembly and whole vehicle considering the flexibility of linkage mechanism of suspension relying on a certain SUV are established with Adams/Car and Hypermesh software to analyze the influence of multi-link suspension structure parameters to suspension kinematics characteristic and handling and stability.First, the McPherson suspension and multi-link suspension structure are introduced and the evaluation indexes of suspension kinematics characteristics are combed. The front and rear suspension models are established with Adams/Car and the difference between pure rigid body and flexible body is made clear.Then, suspension models are used to analyze the suspension kinematics performance, K&C test is used to verify the presented model. The influences of multi-link suspension hardpoints and bushing stiffness on toe angle, camber angle, wheelbase and wheel track changes are analyzed, and the conclusion that coordinate Z of cross arms’internal and external points have great influences on above parameters is very small.Then, steady turning and aking test are used to verify the entire vehicle model. The handling and stability performance is evaluated according to simulation and the conclusion that multi-link suspension bushing stiffness have little impact on body roll angle with conditions of steady turning and aking is carried out.Finally, the yaw problem of a certain SUV exposed to pothole at high speed is analyzed. Simulation on the dynamic response of the vehicle exposed to pothole is carried out. The influences of wheel alignment parameters, suspension hardpoints, spring stiffness, shock absorber damping and bushing stiffness on the yaw response of the vehicle are analyzed, and some conclusions on yaw suppression of the vehicle is presented.