Finite element modelling and optimisation of multi-material acoustic black holes

Austin, Beth and Cheer, Jordan (2023) Finite element modelling and optimisation of multi-material acoustic black holes. In Proceedings of 10th Convention of the European Acoustics Association. European Acoustics Association, EAA. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Geometric acoustic black holes (ABHs) have been proven to be effective as a lightweight passive vibration control solution. However, the thin geometries associated with the design leaves them susceptible to damage. Multi-material ABHs have been proposed as an alternative, whereby the material properties and hence the acoustic impedance of the structure varies along the direction of wave travel as opposed to the geometry. Multi-material ABHs are produced through multi-material additive manufacturing, a relatively costly process which produces final components that cannot easily be altered after production. As such, an accurate numerical model is required to design and optimise the multi-material ABH configuration. This work investigates the best practices for finite element modelling and optimisation of a multi-material ABH design in a beam termination application. Considerations are made into accuracy, computational cost, and the potential effects of the additive manufacturing process on the effective material properties.

This record has no associated files available for download.