Join the Institute of Sound and Vibration for an exciting demo on Acoustic black holes (ABHs).

ABHs have been studied for many years as a passive method of controlling structural vibration. Whilst their design is relatively simple, they are theoretically capable of slowing the speed of wave propagation in structures to zero. This allows for structural damping methods to be applied efficiently to the structure, achieving surprisingly high levels of passive vibration control.

In this demo, damped beam-type ABHs will be demonstrated and compared to damped and undamped beams. When struck, the damped ABHs exhibit a surprisingly short acoustic 'ringing' compared to damped beams/plates, despite appearing to only be slightly different in shape.

The aim is to highlight the surprising levels of passive vibration control that can be achieved through simple yet intelligent modifications to structures.

Discussion around the demo can include possible applications of such systems, basic understanding of the system including basic discussion of structural vibration and modes, and limitations of such systems.