Active control of sound in structural-acoustic coupled systems
Active control of sound in structural-acoustic coupled systems
The thesis is concerned with the active control of harmonic and random sound in structural-acoustic coupled systems. The principal application is to the active control of sound transmission into an enclosure when it is excited by a harmonic or stationary random sound field. The main objective of this thesis is to clarify the role of acoustic and structural actuators in the global active control of harmonic and random sound transmission into structural-acoustic coupled systems. The objective is tackled by way of investigations into i) the physics of structural-acoustic coupling and ii) the physical limitations and control mechanisms of the active control of harmonic and random sound. The investigations are performed by employing three concepts; the concept of impedance and mobility for the analysis of structural-acoustic coupled systems, the concept of control spillover for the active control of harmonic sound, and the constraint of causality for the active control of random sound.
A new approach using the concept of impedance-mobility is proposed to establish a profound theoretical background to the analysis of structural-acoustic coupled systems. The criterion of weak coupling is presented and discussed. In order to provide an intuitive understanding of structural-acoustic coupling, a series of analogues mechanical models representing various cases of structural-acoustic coupling are presented using lumped parameter systems.
For the active control of harmonic sound, a theoretical model using both acoustic and structural actuators is presented. In particular, the role of structural and acoustic actuators is investigated using the concept of control spillover. The hybrid use of structural and acoustic actuators is proposed as an effective configuration to control sound in the coupled system whose response is generally governed by both plate-controlled and cavity-controlled modes.
University of Southampton
Kim, Sang-Myeong
b0cee70c-c830-4294-8258-a99b3094be7d
1998
Kim, Sang-Myeong
b0cee70c-c830-4294-8258-a99b3094be7d
Kim, Sang-Myeong
(1998)
Active control of sound in structural-acoustic coupled systems.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The thesis is concerned with the active control of harmonic and random sound in structural-acoustic coupled systems. The principal application is to the active control of sound transmission into an enclosure when it is excited by a harmonic or stationary random sound field. The main objective of this thesis is to clarify the role of acoustic and structural actuators in the global active control of harmonic and random sound transmission into structural-acoustic coupled systems. The objective is tackled by way of investigations into i) the physics of structural-acoustic coupling and ii) the physical limitations and control mechanisms of the active control of harmonic and random sound. The investigations are performed by employing three concepts; the concept of impedance and mobility for the analysis of structural-acoustic coupled systems, the concept of control spillover for the active control of harmonic sound, and the constraint of causality for the active control of random sound.
A new approach using the concept of impedance-mobility is proposed to establish a profound theoretical background to the analysis of structural-acoustic coupled systems. The criterion of weak coupling is presented and discussed. In order to provide an intuitive understanding of structural-acoustic coupling, a series of analogues mechanical models representing various cases of structural-acoustic coupling are presented using lumped parameter systems.
For the active control of harmonic sound, a theoretical model using both acoustic and structural actuators is presented. In particular, the role of structural and acoustic actuators is investigated using the concept of control spillover. The hybrid use of structural and acoustic actuators is proposed as an effective configuration to control sound in the coupled system whose response is generally governed by both plate-controlled and cavity-controlled modes.
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Published date: 1998
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Local EPrints ID: 463316
URI: http://eprints.soton.ac.uk/id/eprint/463316
PURE UUID: 8fdcc99e-0360-44ac-96f5-5099fa7bbe0f
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Date deposited: 04 Jul 2022 20:49
Last modified: 04 Jul 2022 20:49
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Author:
Sang-Myeong Kim
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