A Nonlinear PID Controller with a Tracking Differentiator in the High Precision Servo System

Abstract:

Classical linear PID controllers have such disadvantages as the derivative signal unable to be used owing to the noise amplification effect, and the contradiction between the more swiftness and less overshoot. We develop a practical nonlinear PID controller based on a tracking differentiator (TD) in the high precision servo system of the three-axis flight simulator, which could eliminate above disadvantages. The nonlinear PID controller adopts the tracking differentiator to arrange the response process and produce the ideal derivative signal of the reference signal. We use a nonlinear combination function of the error proportional, integral and derivative item in the PID controller. The simulation results in Matlab Simulink demonstrate that the nonlinear PID controller makes the flight simulator servo system with the friction disturbance realize the higher position tracking precision and velocity tracking precision. The nonlinear PID controller with the TD is superior to the classical PID one in control performance.

• Periodical: Applied Mechanics and Materials (Volumes 670-671)
• Pages: 1378-1384
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.670-671.1378
• Online since: October 2014
• Authors: Tao Zhou*, Ling Li, Lei Lei Jia
• Keywords: Nonlinear, PID Controller, Servo System, Simulation Test, Tracking Differentiator

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