Study On Car Handling Stability Based On Rigid-flexible Coupling Method

The automobile suspension is an important system which influence the stabilityperformance of vehicle suspension, the research on vehicle handling and stability hastheoretical significance and practical value. This paper takes the new developed car asthe object, before physical prototype manufacturing, application of multi-bodydynamics theory and finite element method, considering the suspension of flexiblelarge elastic deformation of components, establishes the vehicle dynamic model ofrigid-flexible coupling suspension, analysis and forecast the influence of suspensionsystem on the vehicle handling and stability. Sensitivity analysis of the effect of frontsuspension hard points change on the front wheel orientation parameter, and the frontwheel alignment parameters are analyzed and optimized. In accordance with nationalstandards and criteria, this paper takes a simulation analysis and evaluation one thestability before optimization, after the handling of the vehicle.First of all, in order to make the model more close to the actual, through theanalysis of the topology of vehicle suspension structure, the suspension of flexiblelarge component transverse stability rod and the rear suspension trailing arm for finiteelement analysis, the modal neutral file has obtained. Furthermore, by using themulti-body dynamics simulation software ADAMS/CAR to establish the front andrear suspension rigid-flexible coupling dynamics model based on the finite elementanalysis, and the front suspension for beating wheeled parallel test, simulationanalysis of front wheel alignment parameters with the wheel jumping test.Establishing the rigid-flexible coupling dynamic simulation model of a vehicle inADAMS/CAR, handling stability simulation analysis according to the nationalstandard GB/T6323.6-94for the vehicle rigid-flexible coupling dynamics model,evaluating and scoring according to our country automobile industry standard QC/T480-1999, analysis of front suspension parts with hard point coordinates of the frontwheel orientation parameter changes using the ADAMS/INSIGHT sensitivity,improved through sensitivity analysis and optimization discussion on influence ofoptimization, the front suspension parts hard point coordinates of the front wheelorientation parameter changes to improve. Finally, taking a comparative analysis offront wheel alignment parameters before and after optimization of vehicle steadycircular, serpentine test, steering wheel angle step and angle pulse test, steering return-ability and handiness of steering conditions and performance.The front wheel alignment parameters is reduced with the variety of the frontwheel jumping rage. The vehicle in front wheel alignment’s optimized handlingstability is better than that before optimization, the overall score improved from90.3to91.2, it offers the analysis and prediction for latter’s prototype manufacturing andvehicle calibration.