Abstract

A new adaptive dynamic vibration absorber (DVA) is proposed for vibration isolation to change in amplitude of vibration in the primary system i.e., simply supported beam under harmonic excitation. Traditional means of vibration control have involved the use of passive methods. This study is different by involving an adaptive component in the design of vibration absorber. The cantilever absorber with a tip mass is designed. The vibration amplitude in primary system is suppressed by changing the natural frequency of the absorber. This is achieved by moving the mass automatically along the effective length of the cantilever rod. Finite element analysis and Euler-Bernoulli beam theory is are used for evaluation of the performance of vibration isolation of the proposed absorber mounted to a primary system. Study of two different types of arrangement of the cantilevered mass absorber is carried out. It is proved theoretically that the absorber can isolate the vibration of the primary system when it subjected to a change in vibration amplitude under harmonic excitation. Both numerical and finite element analyseis of the combined system using MATLAB and ANSYS respectively, have also been carried out for verification of the theoretical prediction of vibration isolation in a beam vibration.

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