Research On The Handling And Stability For Vehicle Based On The Characteristic Of A Certain Car Front Suspension

This research carries out kinematic simulation and analysis for the front McPherson suspension, based on dynamic theory and vehicle handling and stability, and applies Adams/Insight module in researching and optimizing its structure parameters; meanwhile, the research develops the template of rear twist beam suspension, which enriches the template library of suspension in Adams/Car. Furthermore, the research establishes a virtual prototype model of vehicle and carries out a test simulation of vehicle handling and stability so as to compare the vehicle handling and stability performance before and after the optimal front suspension.Firstly, in this research, the researcher applied Catia software in establishing a three-dimensional model of the front McPherson suspension, and used Adams/Car to establish its parameterized model. The researcher also used Solidworks to establish the twist beam and imports the beam into the finite element analysis software for meshing according to the principle of flexible body modeling; then, the beam was imported into Adams/Car through Mode Neutral File; thus, the template of twist beam of rear suspension was obtained. On the basis of these achievements, the researcher set up the virtual prototype models of the rear suspension, steering system, the front lateral stability rod and wheel sub-system, and finally built the kinematic simulation system model of the front suspension and the rear suspension.Secondly, in the paper, the author carried out the kinematic simulation analysis for the front suspension, and verified the correctness of the model from the kinematic point of view. The author also identified the factors that have impacts on the vehicle handling and stability according to the simulation results of the front suspension, and then applied Adams/Insight in studying the key hinge point coordinates of the front suspension. Thus, the extent and trends of these hinge point coordinates for the wheel alignment parameters were obtained. Test simulation was used to derive the optimal structural parameters and optimize the kinematics of the suspension by a multi-objective and multi-variable optimization.Finally, the researcher (also the author) used Adams/Car to build the virtual prototype model of power, body, brake and other subsystems, which were assembled with the simulation system model of the front and rear suspension to obtain the virtual prototype model of vehicle; then, made a total of six items simulations of vehicle handling and stability, which included steady-state rotation, steering wheel angle pulse, steering wheel angle step, snake, steering portability and turned back. The test results were processed by the corresponding evaluation methods in national standard. The handling and stability of the car were evaluated by scoring in accordance with the national standard, which showed that the car with the optimized front suspension has better handling and stability than the one before optimizing.This paper dwells on the degree of influence and trends of the hard-point coordinates of the front suspension for wheel alignment parameters from the view of vehicle handling and stability. And this paper is of certain reference value concerning how to adjust the parameters of McPherson suspension hard points, choose the parameters as design variables and optimize McPherson suspension kinematic characteristics so as to improve vehicle handling and stability in the future.