Adaptive control of radiated sound power based on time-domain estimates of acoustic radiation modes

Md Nor, Khairul Affendy and Mace, Brian R. and Hioka, Yusuke (2017) Adaptive control of radiated sound power based on time-domain estimates of acoustic radiation modes. In: 24th International Congress on Sound and Vibration, ICSV 2017 2017, 23rd-27th July 2017, London; United Kingdom.

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Abstract

In active structural acoustic control, broadband control of the radiated sound power from a structure can be achieved by minimizing the amplitudes of the acoustic radiation modes (ARMs). The shape of these ARMs is frequency dependent and only a few might radiate significant power in a given frequency range. In this paper a method is described by which the ARMs are estimated in real-time from a number of point response measurements taken on a vibrating structure. These estimates can be used to calculate the radiated power or, here, in a feedforward adaptive control system. Estimates of the ARM amplitudes in the time domain are produced by digitally filtering the outputs of an array of sensors mounted on the radiator. These filters are designed by FIR filters in the frequency domain based on the frequency-dependent ARMs and implemented in the time domain. These estimates are then used as the cost function in a feedforward, adaptive, filtered-X LMS controller. The theory is described with reference to a 2-dimensional vibrating structure. Finally numerical results of real-time simulations are presented.

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	8874/72804
Uncontrolled Keywords:	Acoustic radiation modes, real-time control, FxLMS controller
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA365 Acoustics in engineering. Acoustical engineering
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Suhani Saarani
Date Deposited:	08 Jul 2019 16:38
Last Modified:	08 Jul 2019 16:38
URI:	http://irep.iium.edu.my/id/eprint/72804

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