车辆主动悬架与电动助力转向系统协同优化

Collaborative optimization of vehicle active suspension and electric power steering system

将主动悬架和电动助力转向系统的集成设计问题纳入多学科设计优化框架,实现多目标协同优化。建立了带有LQG控制器的主动悬架模型和电动助力转向模型,充分挖掘其耦合关系,对相关系统参数进行集成化处理并构建协同优化计算模型。基于多学科设计优化的思想,将复杂的集成设计问题转化为一个两级优化问题,让子系统分别承担各自学科的优化任务,同时通过系统级约束来协调子系统间的不一致性。优化结果表明,集成系统性能指标均有所提高,不仅行驶平顺性指标得到较好改善,而且低速转向更轻便,主动悬架作动器作用力也显著降低。

The integrated design of active suspension and electric power steering system is incorporated into the multidisciplinary design optimization framework to achieve multi-objective collaborative optimization.By establishing the active suspension model and the electric power steering model controlled by linearquadratic-Gaussian(LQG),the coupling relationship is fully considered,the relevant system parameters are integrated and the computational model based on cooperation is established. Based on the idea of multidisciplinary design optimization,the complex problems are transformed into a two-level optimization problem,where the subsystems undertake the optimization tasks of their respective disciplines,and coordinate the inconsistencies between subsystems by system-level constraints. The optimization results show that the integrated system performance indicators are improved,not only the ride comfort index is better, but also the low speed steering is lighter, and the active suspension actuator force is also significantly reduced.