Dynamics Modeling, Verification And Optimization Of Full Vehicle Based On Suspension System Performance

With the popularity of cars, people have paid more and more attention on theirperformance, which makes the handling and stability of vehicle are becoming moreimportant. The designers are seeking the relationship between parameters and vehicleperformance in different ways to make a car perform better.To establish the connection between the hard points, the rubber bushing stiffness,the spring stiffness and other design parameters and the vehicle handling performance,the following two steps are conducted. Firstly, the movement and stress condition ofthe tire affected by suspension are analyzed. Based on which, the full vehicle dynamicmodel verified by the experimental data of Steady Static Cornering Test and OnCenter Handling Test is set up through the establishment of variables and functions onADAMS/View. Secondly, a concrete structure multi-link suspension is built onADAMS/Car which can reflect the connection between parameters and suspensioncharacteristics.Optimizations to decrease the toe change gradient and increase the longitudinaldeformation are done. The results show that the Z coordinate of tie rod cut-off pointgreatly impact toe angle gradient and the rubber bushing stiffness in the Z direction ofthe both low suspension arms are the main factors to the longitudinal deformation.Finally, take the optimization of under steer gradient to explain the method whichdeposes the vehicle performance to the suspension parameters, the out coming provesthat lateral force compliance steer and aligning torque compliance steer make greatinfluence on under steer gradient and the rubber bushing stiffness in the Y direction ofthe both low suspension arms have great impact on lateral force compliance steer.