Research On Active Vibration Control Based On Fuzzy PID Control Theory

In the design of aircraft wing structure, the structure of lightweight has always been one of the main goals of design. Lightweight design can reduce the weight of structure and improve the efficiency of aircraft. But lightweight design using lightweight flexible materials tends to have smaller damping that will cause a long time and large amplitude vibration under external excitation which will affect the ability of the wing structure and shorten the useful life. So the research on active vibration control of wing structure has very important theoretical meaning and practical value.PID controller is the most widely used and mature controller in the control field with advantages of simple structure, easy implementation and strong robustness etc. At the same time, fuzzy control, as an important branch of intelligent control, can provide not only objective information of systems, but also human’s subjective experience and intuition into the control system in order to provide powerful means to solve difficult or unable to modeling complex system control problems. It can improve the effect and performance of the active vibration control by combining intelligent fuzzy control and classical PID control in different ways to make use of their advantages.In this thesis, a closed-loop experimental system consisting of cantilever beam as the controlled object, LaRC-MFC as the actuator and laser displacement sensor is established to study on active vibration control. Active vibration control approaches based on PID control, fuzzy control, combined fuzzy-PID control and fuzzy adaptive PID control are designed; The above control methods is used for numerical simulation on the MATLAB simulation platform and analyzed for their performances; An active vibration control experimental system based on the Lab VIEW software development platform is built to realize the above control algorithm and the performance of each control algorithm is evaluated and compared. Experimental results show that the designed combined fuzzy-PID control and fuzzy adaptive PID control can overcome the deficiency in the PID or fuzzy control, reduce the vibration of the cantilever beam structure which in a low frequency resonance state in a shorter period of time and improve the effect of vibration reduction.