Design Optimization Of Double-Arm Independent Suspension System And Vehicle Riding Comfort Simulation

The vehicle riding comfort is one of the important indicators that reflect the vehicle’s performance. Vehicle vibration is the fundamental element that affects vehicle’s irregularity. It may lead to crew fatigue and goods damage, and it would make vehicle parts and components premature wear and fatigue damage. In addition, the vibration of the vehicle is one of the main sources of noise. The performance of vehicles influences each other, so riding comfort also affects other properties. Strong vibration of vehicle would make the wheel jump off the ground, and it also affects vehicle’s dynamics, braking ability and handing stability. In this paper, a double-arm independent suspension system is researched based on the principle of multi-body dynamics, optimize the parameters of suspension by means of ADAMS, and further study on impact of vehicle driving comfort from the suspension system by use of the perspective of virtual prototype, and optimal design of ride comfort and so on.This article set out a more detailed traffic concept of comfort, evaluation index and evaluation methods and the current status of the research in this field. It also introduces the main modules of ADAMS software and the basis of multi-body dynamics theory, which lay the foundation for follow-up research on the virtual prototype modeling and simulation analysis.The article establishes a double-arm suspension model by use of ADAMS/View module. The suspension has been analyzed by use of ADMAS/Insight module. Also set up a complete virtual prototype model of the vehicle which contains optimized front suspension and rear suspension, rack and pinion steering system, tire model and simplified body model.A spectrum of B-class road was constructed by use of harmonic superposition method. And it coincides with the actual road condition. Make a simulation of straight-line driving on B-class road, and get the acceleration of X, Y, Z directions. Process the result of the simulation test according to the evaluation criteria GB/T4970-1996by using post-processing module of ADAMS. Then get the ride comfort evaluation of the vehicle model in the speed of60km/h. The evaluation shows that the suspension stiffness and damping match poorly, and riding comfort is bad.In order to improve riding comfort, the article optimizes the whole vehicle, analyzes the sensitivity of front and rear suspension stiffness and damping, then gets the main design variables of the suspension that impact the driving comfort, and makes an optimized program. The result of the optimization showed that the optimized vehicle model runs more comfortably than before.