Active structural acoustic control of a flat plate using an experimentally identified radiation resistance matrix

Abstract

Active Structural Acoustic Control (ASAC) is a widely used active noise control technique, which provides global control of structurally radiated noise by controlling structural vibrations. Many current ASAC systems rely upon the availability of an accurate, real-time measure of the radiated sound field. This often requires positioning of acoustic error sensors in the radiated sound field, which for many practical setups may not always be possible. Previous research has investigated the implementation of ASAC using structural measurements that can be related to the radiated noise. One such method employs the use of the radiation resistance matrix to estimate the radiated sound power from structural measurements. However, estimation of the radiation resistance matrix has generally relied upon precise modelling of the radiating structure which, for practical structures, can lead to limitations in the accuracy of the estimate. To overcome this problem, this paper presents an ASAC system that utilises an experimentally identified radiation resistance matrix. It is shown via real-time implementation of the proposed strategy for a flat plate, that the proposed ASAC system is effective at controlling structurally radiated noise and out performs an Active Vibration Control (AVC) system using identical hardware. At the first three radiating modes, the proposed method achieves 9, 9 and 23 dB more attenuation in the radiated sound power than AVC.

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Identifiers

ORCID for Jordan Cheer: orcid.org/0000-0002-0552-5506

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