A Fuzzy Logic Control Based Vibration Control System for Renewable Application

Abstract

The main purpose of this thesis is to propose an active vibration control system to minimize the vibration of the structure. Vibration control is still the challenging problem in the field of control engineering. In this thesis, two electromagnetic actuators are used to minimize the vibration of the structure. Fuzzy logic control techniques are adopted here as the control system. Two electromagnets are placed at the midpoint of the beam, one above the structure and one below the structure. The beam model is first deriving analytically according to the Euler–Bernoulli beam theory. A noncontact displacement sensor is used to measure the displacement of the mid-span of the beam. The fuzzy logic control technique is used as controller to decide the output direct current (D.C.) passing through the coils of the electromagnet based on velocity and displacement of midpoint of the beam. When any external disturbance load is applied at midpoint of the beam, then beam starts to oscillate in upward and downward directions from static equilibrium position. During the upward displacement of the beam from the static equilibrium position, the bottom electromagnet actuator is switched on and electromagnet will give a magnetic force in the opposite direction of motion of the beam. Similarly, during the downward movement of the beam below the static equilibrium position, the top electromagnetic actuator is switched on and electromagnet will give a magnetic force in the opposite downward motion of the beam. In this thesis, it is shown that the proposed damper successfully minimizes the amplitude of vibration of the beam due to the action of step excitation and chirp signal excitation.