A Piezoelectric Actuator Hysteresis Neural Network Compensation Method for Active Control of Helicopter Body Vibration

Abstract

The invention discloses a piezoelectric actuator hysteresis neural network compensation method for active control of helicopter body vibration, belongs to the field of helicopter vibration control, and has multi-order harmonic response vibration characteristics and piezoelectric actuator drive for helicopter body vibration In the process of actively controlling the vibration of the helicopter body, the high-order harmonic response caused by the hysteretic nonlinearity of the piezoelectric actuator leads to the deterioration of the control effect. Based on the neural network and the nonlinear autoregressive exogenous (NARX) input model, two methods are proposed. Hysteretic nonlinear neural network and nonlinear compensation neural network of piezoelectric actuator driven by order harmonic signal, and the nonlinear compensation neural network is used in active vibration control system of helicopter body driven by piezoelectric actuator. The hysteresis neural network compensation method of the piezoelectric actuator proposed by the invention can obviously improve the control effect of the active vibration control system of the helicopter body.

Description

Technical field [0001] The present invention belongs to the technical field of helicopter vibration control, and more particularly to a piezoelectric actuator hysteresis neural network compensation for helicopter body vibration active control. Background technique [0002] The high vibration level of the helicopter seriously affects the driver's work efficiency, the reliability of the airborne equipment and the comfort of the passenger. Helicopter body vibration is RN caused by rotor b Ω multi-harmonic vibration is main, where R is a harmonic order, n b For the number of rotor blades, ω is a rotor speed. Vibration Active Control is the ideal helicopter body vibration control method, the piezoelectric actuator has the advantages of light, fast response speed, large output force, etc., and is the ideal active operation of the helicopter body vibration actively controls the ideal active However, illegal nonlinearity of piezoelectric ceramic material can cause disagree between the in...

AI Technical Summary

Problems solved by technology

However, the hysteresis loop of the piezoelectric actuator is asymmetrical, and it is difficult to accurately simulate its hysteresis characteristics with commonly used symmetric models.

Moreover, helicopter vibration is a multi-harmonic vibration, and it is usually necessary to control two or more harmonics to achieve a better control effect. However, the current empirical models rarely study the hysteresis nonlinear characteristics and nonlinear characteristics of piezoelectric actuators driven by multi-harmonics. compensate

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