中文摘要：

针对交叉变轮距车辆底盘,基于阿克曼转向原理,提出一种机械式可变特性转向系统;应用UG建立底盘转向系统模型,分析车辆变轮距条件下的转向需求,建立转向单元的可变特性;并进行转向稳定性仿真分析,验证转向系统与交叉变轮距底盘的协调性。分析表明：在该型转向系统操纵下转向轮滑移率符合设计标准的要求,转向机构设计思路正确,为转向系统结构参数优化提供了保证。

英文摘要：

A steering system with mechanical variable characteristics is proposed for crossing variable wheel track chassis,based on the Ackerman steering principle.The model of chassis and steering system is built using UG,and the variable characteristic of turning unit is established under the condition of variable wheel track.Combined with the tools of simulation module of UG,the steering system simulation model is set up and the simulation analysis for steering stability is conducted,to verify the coordination between the steering system and cross wheelbase chassis.Analysis results show that,the slip rate of steering wheel conforms to the design standards,the design ideas of steering mechanism and the implementation method are correct,and it provides a premise to optimization of the structure parameters of steering system.