Optimisation of a modified acoustic black hole profile for the reduction of dynamic stress

Keys, Archie and Cheer, Jordan (2024) Optimisation of a modified acoustic black hole profile for the reduction of dynamic stress. In Proceedings of ISMA2024. 10 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Acoustic Black Holes (ABHs) make use of structural modifications to effectively reduce the wave speed of vibration in a structure. This increases the effectiveness of damping material applied to the ABH and results in more effective vibration control. The most common realisation of an ABH is to gradually taper the thickness of a structure, resulting in a very thin tip when realised as a structural termination. The ABH effect causes an increase in energy density as structural thickness decreases, resulting in a large amount of energy being focused within the thin section of the ABH. This raises concerns around high levels of dynamic stress in the structure. This paper presents a modified ABH taper profile that aims to reduce the level of dynamic stress in the structure while maintaining ABH performance. The parameters defining the modified ABH profile are optimised to reduce dynamic stress in the taper while maintaining ABH performance, and the optimised profile is compared to the conventional ABH for both performance measures.

This record has no associated files available for download.