活塞加工中的周期性参考与干扰信号的鲁棒二自由度控制

Robust 2DOF Control for Periodic Reference Signal and Disturbance Signal in Piston Machining

在中凸变椭圆活塞车削过程中,系统的快速跟踪性能和抗扰性能是两个关键问题。由于系统的参考信号和干扰信号都具有按椭圆规律周期变化的特点,针对直线伺服驱动系统研究了对参考信号的跟踪和对变化负载扰动的抑制,提出零相位误差跟踪控制(ZPETC)和改进型重复控制相结合的二自由度鲁棒跟踪控制策略,以解决跟踪控制性能和抗扰性能之间的矛盾。从而既提高快速跟踪能力,又减小负载扰动对刀具定位的影响,仿真结果验证了此方案的有效性。

In the turning process of the convexity variable ellipse piston, the fast tracking and disturbance resisting are two key problems. Because both the reference signal and disturbance signal of the system have the characteristic according to ellipse periodic change law, for the linear servo drive system, the tracking to the reference signal and the resistance to the load variation are studied, a two-degrees of freedom （2DOF） robust tracking control combining zero phase errort tracking control with modified repetitive control is proposed, to solve the conflict problem between fasr tracking and disturbance resisting. Thus the fast tracking capability of the system is enhanced, the influence of the tool location to load disturbance is diminished. The simulation results show that the scheme is effective.