ACTIVE VIBRATION CONTROL OF THE CANTILEVER STRUCTURE USING SHAPE MEMORY ALLOY - A NUMERICAL APPROACH

摘要

In this paper, a numerical study of the active vibration control of cantilever structure using SMA wires is presented. Finite element model of the beam was established and mathematic expression for the dynamic transient response of the beam during the active control was deduced. The simulation shows that the vibration frequency drifts when the beam is under the vibration control, which was subsequently confirmed by experiment. Also found was that the vibration decay envelope is not exponential but close to parabolic. Consequently, the Least Square CompJex Exponential (LSCE) method was used to calculate the damping efficiency. The results obtained on the controlled cantilever beam have a good agreement with the experimental results published previously. Using this model, the effects of various parameters on damping factor of the beam, when its vibration is under control, using SMA actuators were studied.