基于虚拟动态工况的三轴轮式越野车悬架构件强度分析

Strength Analysis on Suspension Components of Three-axle Off-road Wheeled Vehicle Based on Virtual Driving Conditions

三轴轮式越野车采用双横臂独立悬架的结构形式。为得到悬架构件的动态载荷特征和应力特性,进行虚拟动态工况下的车辆强度分析。建立悬架上、下摆臂有限元模型以及三种动态行驶工况路面模型,利用多体动力学分析软件建立整车刚-弹耦合动力学模型。在三种动态行驶工况下进行虚拟试验,得到悬架系统动态载荷,并定义"动载系数"进行分析;对悬架系统关重件的动态应力进行分析,确定构件高应力区。结果表明,悬架构件强度能够满足设计要求,但是接近屈服极限,须进行结构优化设计。

Double wishbone independent suspension is used on three-axle off-road wheeled vehicle. In order to obtain the dynamic loads and stress characteristic, strength analysis was developed on virtual conditions. Finite ele- ment models of upper and lower wishbones was built, besides, three road models of dynamic condition were estab- lished. Rigid-flexible coupling dynamic model of full vehicle model was constructed by dynamic software and virtual experiments were implemented. Defining ＂coefficient of dynamic load＂ to analyze dynamic load of suspension sys- tem. Dynamic stress could be got and high stress zones were determined. The result shows that the strength of sus- pension can fulfill the design demand but be close to yield limit, so the optimization design should be carried out.