Vibration Suppression Analysis Based on “Bridge” Damping Acoustic Black Hole Structure

doi:10.3901/JME.2024.07.134

Abstract

Abstract: In the engineering, structural vibration suppression is usually achieved by pasting damping material over the host structure. However, the large usage of damping material leads to an increase of the structural weight. And the vibration suppression efficiency is not high. As a new type of lightweight damping, Acoustic black holes (ABHs) achieve high-efficiency wave energy focusing and dissipation through structural thickness tailoring. It has received widespread attention in recent years. A structural design of bridge-ABH (B-ABH) is proposed, which embeds the ABH feather in the damping material to improve the vibration energy dissipation efficiency of the structure with less amount of damping material. The numerical model of B-ABH structure is established by finite element method. The wave propagation characteristics in B-ABHs in damping materials with high loss characteristics are studied. And the mechanical energy flow analysis and damping characteristics of the B-ABH damping structures are analysed. The vibration suppression mechanism of B-ABH damping structure is revealed. In addition, the use of additional mass further improves the low-frequency vibration effect of the structure. The results show that compared with the uniform damping layer, the additional mass B-ABH damping structure is reduced by 30%. And the structural vibration suppression is reduced by an average of 4.6 dB in the frequency range of 10～1 000 Hz.

Key words: acoustic black hole, high damping, energy gathering, mechanical energy flow

CLC Number:

TH113

WANG Heng, HUANG Wei, JI Hongli, QIU Jinhao. Vibration Suppression Analysis Based on “Bridge” Damping Acoustic Black Hole Structure[J]. Journal of Mechanical Engineering, 2024, 60(7): 134-143.

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