Smith Predictor Based Robust Rapid Tracking Controller

1 Introduction PID close loop control is usually usedinthe control of noncircular machining,at the sameti me ,feedforwardcontrol is appliedto di minishthe response delay of linear feedstructure .Inthis method,poor robustness of con-ventional PIDandinaccurate model identification make the machining precision hard to be i mproved. Design ofthe controller which can get high precision and si mply to achieve is i mportant toi mprove the machining perfor-mance.In the paper ,the model of piezoelect…

Smith Predictor Based Robust Rapid Tracking Controller

Precise model is hard to get in real application,a Smith predictor based robust rapid tracking controller for inaccurate model is proposed. Zero phase error feedforward controller which increases system closed-loop dynamics and disturbance observer based Smith feedback control which diminishes model hysteresis and improves stability are integrated. This method is applied in the noncircular machining with piezoelectric ceramic driver. The simulation and experiment show that the performance robustness and stability are well balanced in bandwidth about 200 Hz. The controller can decrease system hysteresis and get good tracking performance for predefined square-wave input signal.