Control of flexural waves on a beam using multiple vibration neutralizers

Gao, Y. and Brennan, M.J. (2010) Control of flexural waves on a beam using multiple vibration neutralizers. Brennan, M.J., Kovacic, Ivana, Lopes, V., Murphy, K., Petersson, B., Rizzi, S. and Yang, T. (eds.) In Recent Advances Structural Dynamics: Proceedings of the X International Conference. University of Southampton. 12pp .

Abstract

This paper is concerned with the use of multiple vibration neutralisers to control the transmission of flexural waves on a beam. A simple design of a beam-like vibration neutraliser is of particular interest to exert a force and an uncoupled force-moment to the beam. The multiple neutralisers consist of several vibration neutralisers in an array attached over a certain length on the beam. General expressions for wave transmission and reflection metrics are derived. Based on the transmission efficiency, the characteristics of the multiple vibration neutralises are investigated in terms of the minimum transmission efficiency, the turned frequency bandwidth and the shape factor, allowing optimisation of their performance.

Analytical results show that the bandstop property of the multiple vibration neutralisers depends on various factors, including the neutraliser damping, mass, separation distance in the array and the moment arm. Moreover, it is found that the particular attachment configuration of the uncoupled force-moment neutraliser can be used to improve the overall performance. The theoretical work offers a scope for flexural wave suppression using multiple vibration neutralisers at the design stage.

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