Sound transmission through a flexible panel into an enclosure: structural–acoustics model

Al-Bassyiouni, Moustafa; Balachandran, Balakumar

doi:10.1016/j.jsv.2004.06.040

Cited by 39 publications

(33 citation statements)

References 15 publications

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“…It is assumed that the sound is transmitted through the flexible panel which is attached with clamped boundary conditions to the enclosure. For this purpose the modal analysis of such an enclosure is performed and the results are compared with analytical and experimental results obtained in related study [3]. The error analysis of the obtained resonant frequencies will help to verify our developed model.…”

Section: Introductionmentioning

confidence: 93%

“…Many of these applications can be modeled by a 3-D cavity with a flexible boundary condition on one of its side. An approach to this modeling is to consider an enclosure with rigid boundary conditions [1,2] and extends to the case where one of its boundaries is considered as a flexible [3,4]. Excitation of flexible plate by sound source will cause vibrations on the plate and generate noise inside the cavity.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of sound-structure interaction in a rectangular enclosure using finite element method

Mohamady

Montazeri

Kamil

2009

2009 IEEE Symposium on Industrial Electronics &Amp; Applications

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In this paper the effect of periodic noise traveling into a rectangular enclosure is simulated using finite element technique using COMSOL Multiphysics software. The acoustic wave which is generated by a point source outside an enclosure propagates through the enclosure wall and excites the flexible panel which is mounted on the enclosure. The behavior of transmission of sound into the cavity is investigated by computing the modal characteristics of the cavity. Base on the model proposed, simulation part is conducted to examine the natural frequency response of system as well as to compute the distortion effect of the structure response and the acoustic pressure observed within the enclosure. The simulation results were compared with previous experimental and analytical works for validation and a good match between them were obtained.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Modeling of sound-structure interaction in a rectangular enclosure using finite element method

Mohamady

Montazeri

Kamil

2009

2009 IEEE Symposium on Industrial Electronics &Amp; Applications

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“…They concluded that it is possible to actively suppress radiated sound in an acoustic cavity subject to a broadband disturbance through flexible structure using structural sensing and feedback control. Al-Bassyiouni and Balachandran (2005) investigated the active control of sound transmission through a flexible panel into an enclosure subject to an incident spherical wave using piezoelectric actuators bonded on the panel. They highlighted the general model description using a spherical wave incidence instead of a plane wave incidence.…”

Section: Active Controlmentioning

confidence: 99%

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

Kim

2009

The Journal of the Acoustical Society of America

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The aim of this thesis is to investigate the structural-acoustic coupling effects on the dynamic behaviour of a vibro-acoustic system under passive/active control. The simplest model of a vibro-acoustic system one can consider is a one-dimensional acoustic cavity driven by a single-degree-of-freedom (SDOF) structure. This simple model is used to demonstrate the physical characteristics of the coupling phenomenon. This simple analytical model can provide various degrees of structural-acoustic coupling, which are dependent upon (i) the structural-acoustic stiffness ratio, (ii) structural-acoustic natural frequency ratio, (iii) structural damping, and (iv) acoustic damping. In this case, although the geometric coupling factor is not included because the SDOF structure has a single mode, 80 percent of the factors that determine the degree of coupling can be accounted for by the simple analytical model. The coupling mechanism, in the simple vibro-acoustic system, is investigated using the mobilityimpedance approach. In order to provide the threshold of the degree of coupling, a coupling factor is calculated in terms of non-dimensional structural-acoustic parameters. Vibroacoustic responses are represented by the acoustic potential energy in the cavity and the kinetic energy of the structure coupled to the acoustic cavity.The vibro-acoustic responses are investigated for various coupled cases. The principles are demonstrated by controlling the acoustic potential energy in the one-dimensional finite acoustic tube driven by the SDOF structure. Three control strategies are applied; passive control, active feedforward control and decentralised velocity feedback control. Passive control is investigated to achieve physical insight into the relative benefits of passive control i treatments. In the more strongly coupled case, acoustical modifications were preferable for the reduction of the acoustic potential energy. On the other hand, in the more weakly coupled case, structural modifications were more effective. For harmonic disturbance, an active feedforward control strategy is considered for the control of the acoustic potential energy in the cavity driven by the structure under external harmonic excitation. For the active feedforward control systems, this study uses the concept of optimal impedance, which is defined as the ratio of the control force to the velocity of a secondary source when the acoustic potential energy is minimised. In the more strongly coupled case, all the acoustic modes were effectively suppressed at the resonance frequencies. On the other hand, in the more weakly coupled case, all the acoustic modes were controllable as in the more strongly coupled case. However, the structural mode was generally uncontrollable. For broadband disturbance, decentralised velocity feedback control is formulated to investigate the relative control effectiveness of structural and acoustic actuators for the control of the acoustic potential energy. In the more strongly coupled case, the control configuration of using the ...

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“…The structural-acoustic coupling mechanism between a flexible structure and a cavity of semi-infinite size was studied by Kim and Kim [13] using the wave-based approach. A combination of analytical and numerical techniques was employed by Bassyiouni and Balachandran [14] to predict the sound pressure inside a plate-cavity system. Alternate supplementary techniques including Green's function, integro-modal and impedance-mobility approaches have also been addressed in the literature [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Vibro-acoustic analysis of a coach platform under random excitation

Sadri

Younesian

2015

Thin-Walled Structures

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Sound transmission through a flexible panel into an enclosure: structural–acoustics model

Cited by 39 publications

References 15 publications

Modeling of sound-structure interaction in a rectangular enclosure using finite element method

Modeling of sound-structure interaction in a rectangular enclosure using finite element method

The influence of structural-acoustic coupling on the dynamic behaviour of a one- dimensional vibro-acoustic system

Vibro-acoustic analysis of a coach platform under random excitation

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