随机参数连杆机构的静动态运动精度可靠性分析

Reliability Analysis of Static and Dynamic Kinematics Accuracy for Flat Four-bar Mechanism with Random Parameters

将平面连杆机构的杆长、截面尺寸、铰链间隙、质量密度、弹性模量等几何、物理参数均视为随机变量,对机构输出运动进行了静态和动态误差分析。应用微小位移的线性叠加原理分别对静态、动态误差进行综合分析,建立了机构输出运动精度可靠性分析模型。通过算例,考察了机构中各个随机参数对输出运动精度可靠度的影响,获得了一些有意义的结论。

This paper deals with the static and dynamic output kinematics accuracy of a group of high speed flat four-bar mechanism with the same design parameters by taking the bar length, joint-gaps, mass density, such geometric and physical parameters as stochastic variables. According to the principle of linear superposition of small displacement, the static and dynamic output kinematic accuracy are comprehensively analyzed, and the reliability model of high speed fiat four-bar mechanism kinematic accuracy is built. Through an example, the influences of the stochastic variables on the reliability of kinematics accuracy of the mechanism are discussed, and some useful conclusions are drawn.