活塞车直线伺服刀架系统对于幅值变化的周期性扰动抑制的研究

在中凸变椭圆活塞车削的过程中,系统的扰动抑制是一个关键问题.文章针对直线伺服刀架系统对变化负载的扰动抑制进行了分析,指出切削力的干扰是按变椭圆规律周期变化的,对重复控制器在周期参考输入信号的情况下,分别对幅值不变和幅值变化的周期性负载扰动抑制的效果进行了研究,指出重复控制器对于幅值变化的周期性扰动信号没有对于幅值不变的周期性扰动信号抑制的效果好.为解决此问题提出了一种PID反馈补偿控制策略,仿真结果表明该控制方法可以达到较好的控制效果,增加了系统的抗扰性,为提高中凸变椭圆活塞加工精度提供了一条途径.

Research on restraint for varied amplitude periodical disturbance to linear servo carriage system used for piston machining

Disturbance restraint is a key problem in the process of middle-convex and varying ellipse piston machining. The disturbance restraint for varying load to linear servo carriage system is analyzed in the paper and the disturbance of cutting force varying periodically according to varying ellipse law is pointed out. The effect of load disturbance restraint for unvaried amplitude and varied amplitude periodical command is researched respectively on repetitive controller when input is periodical reference command. The effect of disturbance restraint for varied amplitude periodical command is not better than unvaried amplitude periodical command. A PID feedback compensation control strategy is presented to solve this problem. The simulation results show this method can reach better effect and disturbance restraint for the system is increased. An approach for improving middle-convex and varying ellipse piston machining precision is presented.