The Simulation Of Suspension Kinematics And Ride Performance Of Car

Ride comfort is one of the prime performances of modem vehicle. Now the investigation to research vehicle ride perform is attached more and more attention. Meanwhile, with the development tendency of vehicle design toward slight weight, the flexible deformations of the suspension parts can't be neglected. Therefore, it is very necessary to research the flexible elements' influence on the vehicle ride comfort.First, the paper introduces development of vehicle ride comfort and the basal theory of multi-body dynamics .Second, the article uses ADAMS software to builds a whole multi-body model of A-class car which include front suspension, rear suspension, the steering system, chassis and so on.Third, the article researches the differences of suspension's kinematics among rigid multi-body model, the rigid-flexible coupling suspension model and real model. The results show that: toe angle of rigid-flexible coupling suspension's simulation are more closed to real model than rigid multi-body model, but its kingpin-inclination angle do not more differences than rigid multi-body model's. And the kinematics analysis of McPherson independent suspension was made by Visual C++. The simulation results show that the visible interface designed for analyzing McPherson suspension was feasible and effective in practice.The simulation of vehicle ride comfort which includes pulse input and random input under different speeds is realized. The results show that rigid-flexible coupling whole vehicle model is comparing to rigid multi-body model, their have the same frequency responses; the rigid-flexible coupling whole vehicle's acceleration RMS is lower than rigid multi-body model's.The paper optimizes the suspension parameters of the rigid-flexible coupling full vehicle model by Design of Experiment (DOE) in ADAMS/Insight. The optimization improves the vehicle ride comfort.