Research On Vibration Control Of A Cantilever Beam Based On Fuzzy PID Control

With the rapid development of aviation and aerospace, the use of smart structures is also growing, especially in aircraft wing design whose structure is developing towards the direction of intelligent and lightweight. During to the small damping of smart structures,when they are subjected to the outside interference, they will be easy to produce resonance, which seriously affect the safety of flight. Aiming vibration problems of smart structures were studied.This paper regarded the cantilever as a model, and piezoelectric material as beam sensors and actuators. Firstly, establishing the cantilever model, analyzing the cantilever natural frequencies and mode shapes through the finite element modeling method and establishing the research model of mathematical functions based on the analysis of resulting data. According to rules and characteristics of the cantilever vibrations, respectively, learned PID control and fuzzy control of the basic theory. On the basis of these two control methods and combining both advantages of the PID controller and fuzzy controller, a fuzzy PID controller was designed to suppress the vibration of the cantilever. And proceeding numerical simulation using this control method in MATLAB software environment to verify the feasibility of the controller.Secondly, this paper built the cantilever vibration system based on the numerical simulation and Lab VIEW control experiment platform. And experimental platform was composed of the power amplifier, signal generator, exciter, charge amplifiers, data acquisition cards and other hardware configuration achieving the functions of the vibration signal data acquisition, transmission, conversion processing and so on, and inhibiting the vibration of the cantilever by the fuzzy PID controller. The results showed that: the fuzzy PID controller can effectively suppress the vibration of the cantilever, compared with PID controller and fuzzy controller, fuzzy PID controller embodying fast response and good vibration suppression effect.