The Automobile Front Suspension System Modeling And Simulation

The automobile suspension system connect with the body and the wheel. It hasfunctions to cushion the impact of shock, dampe vibration and transmit torque. The researchinto it is of major significance in regard to both the handling stability and smoothness ofautomobiles. However, the automobile suspension system is a multi-body system and themotion relationship among the parts is very complicated, so it brings many difficulties tocompute the various characteristics with traditional computation methods. The Automobilesuspension kinetics and dynamic simulation has been a very important task in automobiledesign and development and it provides a rapid and effective method to design automobilesuspension.The research object of this thesis is a front suspension system of some heavy dutyautomobile and it is double wishbone suspension system.This paper points out the components and design requirements of the front suspensionsystem as well as the functions and selection criteria of assembles. Based on that, variousparameters of assembles that are needed for modeling are determined such as massparameters, Kinetic parameters, Mechanic parameters and so on. According to thecorresponding items of data, the characteristic curves of them are also established inADAMS.On this basis, this thesis sets up a three-dimensional model for double wishbonesuspension system in the use of ADAMS/car, sets various parameters of simulation andmakes Kinetic and Mechanic simulation testing of this model.According to the results of simulations, this thesis analyzed performance parameters offront suspension system in ADAMS/Postprocessor, such as camber angle, caster angle,caster offset, Kingpin inclination angle, lateral Migration offset, toe-in angle, steering angle,tread, brake pitching number, accelerating lift number, suspension tangent stiffness, rollstiffness and so on. All these parameters of suspension system, which are in the commonrange of jumper （-50～50mm）, have great impact on handling stability and smoothness of automobiles. The characteristic curves of these parameters are drew along with the variationof jumper. Conversely, these parameters are analyzed based on the characteristic curves.This simulation of double wishbone suspension and the result of it can provide reliablereference for making a rapid and right decision in the suspension simulation program.Therefore this thesis has considerably practical significance in relevant projects.