Advanced fuzzy PID composite control for stabilized platform system

摘要

The Stabilized platform is used for isolating the vibration and disturbance of carrier and ensuring the stability of the line of sight (LOS). Proportional-integral-derivative (PID) control provides an efficient solution to control problems and make good performance in static precision. The fuzzy controller has good robust and is effective for the nonlinear time-varying system. Based on Advanced Scale Factor and Smooth Handover, this paper presents an Advanced Fuzzy PID Composite controller (A-FPID) to achieve high performance in static precision and dynamic characteristic for stabilized platform. Through the study on the A-FPID, the Scale Factor of defuzzification is adjusted by self-adaptive parameters to improve the control effects of fuzzy rules. A fuzzy switch is proposed when controller switches between fuzzy and PID to reduce non-smooth and jitter problems. The simulation results indicate that the A-FPID can obviously improve the system's dynamical performance and enhance its static precision for stabilized platform.