轨迹生成四杆机构优化及仿真研究

Optimization and Simulation Study of Path Generating Four-bar Mechanisms

由于轨迹生成四杆机构存在横向及纵向误差较大,精度较低等问题,因此其不能很好满足四杆机构运动轨迹的要求。对此,文章分析了四杆机构几何参数,采用修正误差函数法,构造优化目标函数。通过具体实例对四杆机构运动的相关尺寸进行优化,借助MATLAB软件计算得出四杆机构最佳几何尺寸值。将优化结果进行仿真,并且与传统方法进行对比。仿真结果显示,四杆机构横向及纵向误差较小,效果较好。采用修正误差函数法对轨迹生成四杆机构优化,优化后四杆机构运动轨迹精确度较高,能够满足多种四杆机构输出运动的要求。

Because horizontal and vertical error is considerably large of path generating four-bar mechanisms,precision is relatively low,which can＇t well meet the requirements of four-bar mechanisms trajectory.To this,the geometrical parameters of four-bar mechanisms are analyzed in this paper. Take correction method of error function,the objective function of optimization is constructed. Relevant dimensions of four-bar mechanisms motion is optimized through specific examples,best of four-bar mechanisms geometry size values were calculated with the help of MATLAB software. The results of the optimization is simulated,and compared with the traditional method. The simulation results showthat the horizontal and vertical error of four-bar mechanisms is smaller,effect is good. Optimization of path generating four-bar mechanisms by the method of correction error function,after optimization of four-bar linkage trajectory track accuracy is higher,which can meet the requirements of a variety of output motion of four-bar mechanisms.