Control of vibration using surface mounted acoustic black holes

Tan, Joe and Cheer, Jordan (2023) Control of vibration using surface mounted acoustic black holes. Forum Acusticum, , Torino, Italy. 11 - 15 Sep 2023. 5 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Acoustic Black Holes (ABHs) are tapered features that can either be surface mounted or embedded into structures to provide effective broadband structural damping. Generally, structures with embedded ABHs require material to be removed from the structure to create the required geometric features. However, for thin plates, it is not straightforward to embed ABHs, since the removal of the material in this case will significantly impact the strength of the structure. Therefore, this paper presents an numerical model based investigation into how surface mounted ABHs can be used to control the vibration of a thin beam over a broad frequency range. The numerical investigation compares the performance of the proposed surface mounted ABHs with a beam treated using conventional passive measures via evaluation of the total kinetic energy of the primary structure. The results presented in this paper show that the surface mounted ABHs achieve greater total kinetic energy attenuation compared to the conventionally treated beam over the presented bandwidth due to the ABH effect. The proposed surface mounted ABHs could be used as an effective broadband vibration control solution for thin structures, where it is not straightforward to design effective embedded ABHs.

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