线控独立转向-悬架导向机构的设计与分析

Design and Analysis of Suspension Guiding Mechanism of Independent Steer by wire System

摘要:

为了消除车轮跳动过程中悬架导向机构与转向杆系的干涉，实现精确独立转向，提高系统集成度，使无驱动半轴传动的全轮线控独立转向电动汽车前后轮采用相同的独立悬架 转向轮模块化结构，提出了一种一体化线控独立转向 悬架导向机构.根据空间机构学理论推导出该导向机构运动分析公式，利用MATLAB分析了单一变量对悬架动力学参数的灵敏度，确定优化设计变量.运用ADAMS/Car建立该导向机构的虚拟样机模型，在ADAMS/Insight模块中对其进行运动学灵敏度分析，找出关键优化设计变量并对其优化，改善悬架运动性能.

关键词:线控独立转向机构; 双横臂悬架; 灵敏度分析; 动力学参数; 优化设计

Abstract:

In order to eliminate the interference between steering linkage and suspension guiding mechanism and to achieve accurate independent steering motion as well as to improve system integrated level and use the same independent suspension / in wheel motor module on both front and rear wheels of four wheels steering electric vehicles without axle shafts, an integrated system of the independent steer by wire system and the suspension guiding mechanism is presented. The formulas for the kinematic analysis of the suspension are derived based on the theory of spatial mechanism, and a sensitivity analysis of the single variables to the suspension kinematic parameters is done by using MATLAB. The virtual prototype model of the suspension guiding mechanism is established by using ADAMS/Car. The optimization variables are selected out according to the analysis results on MATLAB. A sensitivity analysis of the suspension guiding mechanism is made in the ADAMS/Insight, then the critical optimization design variables are found out. The suspension guiding mechanism is optimized according to the analysis results above. The kinematic performance of the suspension is improved.

Key words:independent steer by wire mechanism; double wishbone suspension; sensitivity analysis; kinematic parameters; optimization design