The Research Of Vehicle Ride Based On Rigid-flex Coupled Dynamics System

As the vehicle speed increase and traffic environment become more and more busy, passengers are beginning to pay greater attention to the comfortableness and control stability of vehicle. Suspension system is one of an indispensable assembly of vehicle, which transfers all the loads between road and vehicle body and relieves the shock and vibration brought about by the road surface roughness. Therefore, the ride and control stability are determined directly by the suspension performance. Nowadays vehicle consumers’great demand on the vehicle’s excellent performance and the need to update new vehicle product given the market competition have put the traditional design method of vehicle into a bottleneck state. The development of computer technology and multi-body dynamics theory boost the birth and extensive application of some universal commercial multi-body dynamics software. This new research method has shortened the research process and period of new product, which also reduces the cost effectively and improve the new product performance so as to dominate the market share more easily.At present, most vehicle in the market of China are of joint venture, while our self-owned brand still proceed with great difficulty. Based on multi-body dynamics theory and multi-body dynamics software ADSAMS and finite element method software ANSYS, this paper has made structure design and performance analysis about typical suspension with the final goal of analysis and optimization of vehicle ride.To assure the control stability and ride of vehicle, this paper has made structure design of Macpherson and double wishbone independent suspension and theory calculation for elastic characteristic、damping characteristic、trim characteristic and rolling characteristic according to the suspension design procedure.This paper has remodeled the lower control arm of suspension and made FEM model in ANSYS used to replace the original rigid model. A test has been assigned to verify and compare the suspension and ride performance of the rigid model and rigid-flexible model.Several working condition in ride simulation have been selected to make a topological optimization for the suspension lower control arm. And tests to check the structural intensity and ride performance has been implemented. With the test factors of stiffness and damping of both Macpherson and double wishbone suspension and test function of chassis vertical acceleration, this paper has schemed a series of orthogonal test and sifted an optimal combination from all test factors group.