The Suspension Multi-body Dynamic Analysis And Steering Transient Response Research Of Vehicle Based On ADAMS

The steering transient response is one of the most important performances in vehicle's handling convenience,while the suspension is the main mechanism of transient characteristic,has the extremely important influence on the safety of vehicles.The traditional research needs in the physical prototype test,time consuming and high cost.But due to some test potentially dangerous and difficult to implement.The development of virtual prototype technology and its application in automobile industry provides method to solve these problems.The front McPherson suspension independent Suspension dynamics simulation model of some car has been in ADAMS/Car,based on the relative motion relationship of the suspension assembly and their parameters,kinematics simulation analysis has been carried out,variation regularity of the suspension parameters has been analyzed with parallel wheel travel.According to the results,when the wheel travel changes from-50 mm to 50 mm,kingpin inclination,camber Angle,the change of the wheel track quantity is 2.23°,1.10°,23.19 mm respectively.Kinematics sensitivity analysis of the built-up model has been done in ADAMS/Insight,and optimum structure has been done by Genetic Algorithm.The parallel wheel travel was done on the optimized suspension,the results shows that the kingpin inclination,camber Angle,the change of the wheel track quantity respectively 2.04°,1.02°,22.82 mm.The optimized suspension have better steering portable and stability,effectively reduce the tire wear.The method provides a reference for the optimization of suspension design.The optimized McPherson suspension was used to set up the vehicle simulation model,The steering system model,the tires model,car body model,and the double wishbone rear suspension model is established,and assembly into the vehicle model in ADAMS/Car.According to GB/T6323-1994 requirements,the steering wheel Angle step input simulation test is done on the model.The yawing angular velocity response simulation results compared with the test results,verify the rationality of the model of the vehicle.According to QC/T480-1999 the evaluation method of scoring criteria stipulated in the evaluation of the steering stability of the model,the results show that the model manipulation stability is good and has a certain degree of understeering.The transient response characteristics in different speed,height of mass center,centroid position,front suspension roll Angle stiffness,load of were studied.With the increase of speed,increase height of mass center,centroid position back,increase the front suspension roll Angle stiffness,decrease the load,the transient response characteristics become worse.To improve the performance of the vehicle's steering response so that to ensure the vehicle steering stability,in the process of design,The engineer should as far as possible to reduce vehicle mass center height,appropriate to forward centroid position,the appropriate increase the front suspension roll Angle stiffness.The results provides reference for improving vehicle's steering transient response performance as the goal of the vehicle parameters design.