Piezoelectric actuator hysteresis neural network compensation method for helicopter body vibration active control

Abstract

The invention discloses a piezoelectric actuator hysteresis neural network compensation method for helicopter body vibration active control, and belongs to the field of helicopter vibration control. Aiming at the problems that the helicopter body vibration has the vibration characteristic of multi-order harmonic response, and the control effect becomes poor due to higher harmonic response caused by hysteresis nonlinearity of a piezoelectric actuator in the active control process of helicopter body vibration driven by the piezoelectric actuator, based on a neural network and a nonlinear autoregressive exogenous (NARX) input model, a piezoelectric actuator hysteresis nonlinear neural network and a nonlinear compensation neural network under the driving of two-order harmonic signals are provided, and the nonlinear compensation neural network is used in a helicopter body vibration active control system driven by a piezoelectric actuator. The piezoelectric actuator hysteresis neural networkcompensation method provided by the invention can obviously improve the control effect of the helicopter body vibration active control system.

Description

technical field [0001] The invention belongs to the technical field of helicopter vibration control, in particular to a hysteresis neural network compensation method for a piezoelectric actuator used for active control of helicopter body vibration. Background technique [0002] The high vibration level of the helicopter seriously affects the work efficiency of the pilot, the reliability of the airborne equipment and the comfort of the crew. The vibration of the helicopter body is rN at the frequency caused by the rotor b The multi-harmonic vibration of Ω is dominant, where r is the harmonic order, N b is the number of rotor blades, Ω is the rotor speed. Active vibration control is an ideal vibration control method for the helicopter body. Piezoelectric actuators have the advantages of light weight, fast response, large output force, and wide operating frequency band. They are ideal actuators for active control of helicopter body vibration. However, the hysteretic nonlinea...

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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