基于多运动场耦合的转向系统多目标优化设计

考虑悬挂缸的动刚度特性及轮胎的非线性特性,将转向机构、悬挂、轮胎三运动场进行耦合处理,建立转向系统多目标优化数学模型,对400 t重型矿用自卸车转向系统进行更精确地优化设计. 应用物理规划法,构建转向系统物理规划优化设计模型,通过遗传算法进行模型求解及初步筛选,最后对车辆进行紧急双移线试验,仿真分析其操纵稳定性,实现转向系统优化解集合的最终筛选,为最优解的确定提供了一种新方法. 

Multi-Objective Optimization Design on Steering System Based on Multi-Motion-Field Coupling

In order to gain more precise optimization design of the 400 t heavy-duty mining dump truck's steering system, meanwhile considering dynamic stiffness characteristic of suspension cylinder and nonlinear characteristic of tire, this paper coupled steering mechanism, suspension and tire these three motion fields, then established the mathematical model of steering system for multi-objective optimization. With the use of physical programming method, the physical programming optimal design model of steering system was established, and the optimal solution and preliminary screening were achieved with genetic algorithm. At last, the Trucksim were used to handle stability simulations, which is the emergency double-lane change test. It ultimately selected the optimal solution for design of steering system, and provided a new method for determining the optimal solution.