Model-free tracking control method for piezoelectric ceramic actuators and medium

Abstract

The invention discloses a model-free tracking control method for piezoelectric ceramic actuators and a medium, relates to a robust regression prediction, PI control and self-adaptive inverse-based combined tracking control method, and belongs to the technical field of follow-up control. According to the method, the sine and cosine functions of main orders in micro vibration are taken as primary functions, robust regression is utilized to regress a reference control signal, and a regression value is utilized to predict a practical control signal so as to realize advanced control; the inner ringadopts PI control so as to realize preliminary smooth tracking, for the advanced control signal, of a piezoelectric ceramic; through calculating cross-correlation functions of the response of the piezoelectric ceramic and the reference control signal, an advanced quantity, for the reference control signal, of the response is estimated to adjust the delayed beat number of the pure lag links in a controller, thereby realizing the synchronization of the response of the piezoelectric ceramic and the reference control signal; and through calculating a linear relationship, for the reference controlsignal, of the response, the gain and zero offset of the controller are corrected by utilizing a correction coefficient, so that the amplitude tracking, for the reference control signal, of the response is realized.

Description

technical field [0001] The invention relates to a model-free tracking control method and medium of a piezoelectric ceramic actuator, belonging to the technical field of servo control. Background technique [0002] During the rotation of the flywheel or the rotor in the control moment gyroscope, it will produce wide-band micro-amplitude vibration, which will become one of the main vibration sources of the spacecraft, affecting the ultra-static and ultra-stable performance of the spacecraft, and also to a certain extent. Accuracy The attitude measurement accuracy of precision instruments such as star sensors and the imaging quality of high-resolution cameras. The vibration reduction based on the structure has little effect, and the vibration isolation on the vibration transmission path can receive a relatively ideal effect, including passive vibration isolation and active vibration isolation, and active and passive integrated vibration isolation. Among them, passive vibration...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is: the present invention aims at the performance of piezoelectric ceramic actuators caused by nonlinear characteristics such as hysteresis and creep, slow time-varying characteristics and individual differences, and long-term in-orbit harsh environments. Degradation characteristics and limited resources such as the computing power of controllers in aerospace products, and require aerospace products to operate with high precision and stability under long-term unsupervised conditions, but existing technologies are difficult to effectively overcome the above problems at the same time Fast and accurate tracking of actuators to highly dynamic reference control signals

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