Abstract
Active structural acoustic control (ASAC) is a widely used active noise control technique that provides control of structurally radiated noise through actuation of the radiating structure. Typically, ASAC drives structural actuators to minimise a real-time measurement of the radiated sound field. However, it is often not practical to position error microphones in the radiated sound field. To overcome this limitation, a number of methods have previously been proposed. One such method utilises the radiation resistance matrix to map structural response measurements to the acoustic response and, thus, enable an estimate of the structurally radiated sound power from structural measurements alone. This has previously relied upon precise modelling of the radiating structure which, for practical structures, can lead to limitations in the accuracy of the estimate. In this paper, an ASAC strategy that utilises an experimentally identified radiation resistance matrix is presented. The robustness of both the sound power estimation and the ASAC controller to system uncertainties is investigated, and it has been shown that the proposed ASAC strategy is able to achieve effective control of the radiated sound power.
Highlights
Active structural acoustic control (ASAC) is an effective and lightweight solution for structure-borne sound radiation and transmission problems
ASAC aims to minimise the sound pressure measured at an array of error sensors located in the radiated sound field by controlling structural vibrations using a distribution of structural actuators
This paper investigates how the radiation resistance matrix identified according to the experimental method proposed in Ref. 12 can be utilised in an ASAC system to estimate and control the radiated sound power
Summary
Active structural acoustic control (ASAC) is an effective and lightweight solution for structure-borne sound radiation and transmission problems. Berkhoff proposed a method that uses the responses measured between a number of structural forces and distributions of both structural velocity and acoustic pressure measurements to estimate the radiation resistance matrix.6 This method has been shown to be effective experimentally. An alternative inverse problem–based method has been proposed that identifies the radiation resistance matrix experimentally using the responses measured between a distribution of structural forces and an array of structural velocity and near-field acoustic pressure and particle velocity measurements.12 This method has been shown to accurately estimate both the sound power level and resonance frequencies of the radiating modes when using at least eight forces and both structural and acoustic sensors per acoustic wavelength.
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