Active control of a tuned vibration absorber for use in metamaterial applications

Austin, Beth and Cheer, Jordan (2024) Active control of a tuned vibration absorber for use in metamaterial applications. International Conference on Noise and Vibration Engineering, KU Leuven, Leuven, Belgium. 09 - 11 Sep 2024. 10 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Tuned Vibration Absorbers (TVAs) are an effective method of reducing vibration in a structure at the resonance frequency of the TVA. Unfortunately, TVAs are only effective across the narrow frequency bands to which they are tuned. Recent work has broadened the effective bandwidth of control by combining arrays of TVAs with different resonance frequencies to form a metamaterial. However, the tuning frequencies of these passive metamaterials are still fixed after manufacture and, therefore, cannot effectively handle significant uncertainty or changes in operating conditions. Active control can be used to alter the tuning frequencies of the constituent TVAs and dynamically adjust the effective frequency range of control. This paper proposes a novel active TVA, which incorporates piezoceramic actuators into the absorber and thus enables tuning of the resonance frequency via modifications to the effective stiffness. The paper presents an investigation into the design of the proposed active TVA and the limitations on its tunability using different control strategies.

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