麦弗逊转向悬架的运动学及其二系螺旋研究

发布时间：2018-01-06 23:30

本文关键词：麦弗逊转向悬架的运动学及其二系螺旋研究　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：悬架系统是汽车底盘的重要组成部件,其性能的好坏直接影响到汽车的操纵稳定性和行驶平顺性,因此对悬架系统进行运动学研究具有重要的学术意义和工程实用价值。本文以麦弗逊转向悬架为研究对象,对其进行运动学分析,并综合考虑转向和轮跳自由度,基于螺旋理论对其二系螺旋特性进行研究,从而提出一种分析其瞬时运动学指标的方法。主要工作如下:(1)建立麦弗逊转向悬架的运动学分析模型,计算了悬架的自由度。根据麦弗逊悬架的结构特点,建立悬架的空间位置约束方程,计算出车轮某一转向跳动位置下的悬架位置和车轮位姿。(2)根据悬架位置和车轮位姿矩阵,定义了车轮某一转向跳动位置下的悬架运动学参数。利用MATLAB编程计算,绘制出悬架运动学参数随车轮转向、跳动的变化,并进行分析和评价,揭示了车轮转向、跳动对悬架运动学的影响。(3)基于螺旋理论,分析了与悬架转向和轮跳两自由度运动对应的二系螺旋,并计算了其和螺旋在主坐标系下的方向、位置和节距,给出了表示其空间方位的拟圆柱面和节距分布,揭示了麦弗逊转向悬架的二系螺旋特性。(4)根据悬架的二系螺旋特性,对车轮不同位置下悬架的瞬时运动进行分析,揭示了其运动的螺旋轴线方向、位置和节距随车轮转向速度对跳动速度的相对大小的分布及变化情况。根据车体坐标系下的悬架运动螺旋,定义并计算了悬架运动学参数的瞬时变化。区别于传统将转向和轮跳特性分开单独进行研究的方法,本文基于螺旋理论,应用二系螺旋概念,同时考虑转向和轮跳两个自由度,深刻揭示了转向悬架的运动特点和性能特点,为悬架运动学的研究提供了一种新的思路和方法。
[Abstract]:Suspension system is an important component of automobile chassis, its performance directly affects the handling stability and ride comfort of the vehicle. Therefore, the kinematics of suspension system has important academic significance and practical engineering value. This paper takes the Macpherson steering suspension as the research object, carries on the kinematics analysis to it. Considering the degree of freedom of steering and wheel jumping, the helical characteristics of the second system are studied based on the helical theory. A method of analyzing its instantaneous kinematics index is presented. The main work is as follows: 1) the kinematics analysis model of Macpherson steering suspension is established. The degree of freedom of suspension is calculated. According to the structural characteristics of Macpherson suspension, the space position constraint equation of suspension is established. Calculate the suspension position and wheel position under a certain steering position) according to suspension position and wheel position matrix. The kinematics parameters of suspension at a certain steering position are defined, and the kinematics parameters of suspension with wheel steering and runout are plotted by MATLAB programming, and analyzed and evaluated. The effect of wheel steering and runout on suspension kinematics is revealed. Based on the helical theory, the two-system helix corresponding to suspension steering and wheel jump motion is analyzed. The direction, position and pitch of the helix in the main coordinate system are calculated, and the quasi-cylindrical surface and pitch distribution of the helix are given. The second system helical characteristic of Macpherson steering suspension is revealed. According to the second system helical characteristic of suspension, the instantaneous motion of suspension under different position of wheel is analyzed, and the direction of helical axis of suspension motion is revealed. Distribution and variation of the relative position and pitch with the wheel steering speed to the runout speed. According to the suspension motion spiral in the car-body coordinate system. The instantaneous variation of kinematics parameters of suspension is defined and calculated, which is different from the traditional method of studying the steering and wheel-jump characteristics separately. Based on the helical theory, the concept of two-system helix is applied in this paper. At the same time, considering the two degrees of freedom of steering and wheel jumping, the kinematic and performance characteristics of steering suspension are deeply revealed, which provides a new way of thinking and method for the research of suspension kinematics.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U463.33

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