Control of enclosed sound fields using zero spillover schemes

In this article, a combined analytical and experimental study conducted on the feasibility of implementing a zero spillover scheme for active structural acoustic control is presented. The aim of this effort is to actively control sound fields inside a three-dimensional rectangular enclosure into which noise is transmitted through a flexible boundary. Piezoceramic patches, which are mounted on the flexible boundary, are used as actuators, and microphones, which are placed inside and outside the enclosure, are used as sensors. In the experiments, an attenuation ranging up to 18.1 dB is obtained for narrowband disturbances and an attenuation of 8.3 dB is obtained for broadband excitation in the frequency range of 40 Hz⩽f⩽230 Hz. The role of inherent acoustic feedback in designing the control scheme is also examined and discussed.