关键词: 扭转梁式后悬架, 运动学, 遗传算法, 多目标优化

Abstract:

Through the derivation of torsion beam shear center, a twist beam rear suspension equivalent kinematics model was established under the conditions of roll case, and then the changing relationship among toe angle, wheel track and roll center with the wheel travel in rolling motion could be easily obtained based on this model. Taking the location of beam and center of bushing as design variables, using multi-objective genetic algorithm, an optimization was applied to the variation of toe angle, tire side slip and static roll center height during suspension bouncing, then all the non dominated solutions could be worked out at one time. The suitable suspension roll kinematics characteristics could be chosen from the obtained Pareto solution of the boundary according to the demands, which can be used to guide the design of torsion beam suspension and greatly improve the torsion beam suspension design efficiency.

Key words: torsion beam suspension, kinematics, genetic algorithm, multi-objective optimization