Smart Materials and Structures

Cheer J., Hook K. and Daley S.

Acoustic black holes (ABHs) can be realised as tapered structural features that can be used to absorb incident waves. As a termination, an ABH’s behaviour is characterised by frequency bands of absorption, which are narrow at lower frequencies thus limiting the performance. To address this limitation, the paper investigates an active solution where a piezoelectric patch is driven to minimise the reflected wave component via a feedforward control strategy. The Active ABH termination is shown to outperform a conventional constant thickness active termination and requires less computational and electrical energy to implement.