Smart material (sma)-based actively tuned dynamic vibration absorber for vibration control in real time applications

Abstract

Dynamic Vibration Absorber (DVA) can be used as an effective vibration control device. A (DVA) is essentially a secondary mass, attached to an original system via spring and damper. The natural frequency of the DVA is tuned such that it coincides with the frequency of unwanted vibration in the original system. This result in absorbing the inertial energy transferred from the primary structure. This current study aims at developing an actively tuned dynamic vibration absorber with the help of shape memory alloy (SMA) springs in order to attenuate the vibration for a range of excitation frequencies. In this study, the unique property of SMAs temperature-dependent Young's modulus has been used to change the stiffness of the spring actively to control the vibration. Experiments were carried out with SMA-based dynamic vibration absorber to study the effect of reduction in amplitude of vibration of a cantilever structure. A micro controller-based proportionate control system has been developed for timely actuation of SMA and to supply optimum current to the SMA springs, which are connected in parallel. The experimental results show that the SMA-based dynamic vibration absorber is more effective in reducing the amplitude of vibration for a wider frequency range. The effectiveness of the developed SMA-based DVA was checked in real time-piping application, and the results demonstrate that the SMA springs has good potential to be used as vibration control device.