The effect of fluid–structural coupling on sound waves in an enclosure—Theoretical part

Pan, Jie; Bies, David A.

doi:10.1121/1.398939

Cited by 150 publications

(100 citation statements)

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“…In practical applications, the panel structure of a coupled panel-cavity system generally has a considerable rigidity for load-carrying purposes and the fluid loading is low, and hence its fluid-structural coupling is generally weak (Pan and Bies, 1990;Cheng, 1994). This situation poses certain challenges in designing virtual sensors for acoustic sensing using structural sensors.…”

Section: Optimization Of Structural Sensor Placementmentioning

confidence: 99%

Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: Part II—Optimization of structural sensor placement

Halim

2011

The Journal of the Acoustical Society of America

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The work proposed an optimization approach for structural sensor placement to improve the performance of vibro-acoustic virtual sensor for active noise control applications. The vibroacoustic virtual sensor was designed to estimate the interior sound pressure of an acousticstructural coupled enclosure using structural sensors. A spectral-spatial performance metric was proposed, which was used to quantify the averaged structural sensor output energy of a vibroacoustic system excited by a spatially varying point source. It was shown that (i) the overall virtual sensing error energy was contributed additively by the modal virtual sensing error and the measurement noise energy; (ii) each of the modal virtual sensing error system was contributed by both the modal observability levels for the structural sensing and the target acoustic virtual sensing; and further (iii) the strength of each modal observability level was influenced by the modal coupling and resonance frequencies of the associated uncoupled structural/cavity modes. An optimal design of structural sensor placement was proposed to achieve sufficiently high modal observability levels for certain important panel-and cavity-controlled modes. Numerical analysis on a panel-cavity system demonstrated the importance of structural sensor placement on virtual sensing and active noise control performance, particularly for cavitycontrolled modes.

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Section: Optimization Of Structural Sensor Placementmentioning

confidence: 99%

Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: Part II—Optimization of structural sensor placement

Halim

2011

The Journal of the Acoustical Society of America

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“…First, the interior acoustic responses can only be sensed structurally in terms of the fluid-structural coupling. Such a coupling is usually weak due to the relatively high stiffness of the panel and the low density of air (Pan and Bies, 1990;Cheng, 1994). This concern is articulated when an acoustic excitation is considered because the system responses are dominated by acoustic modes that need to be detected accurately using structural sensors.…”

Section: Introductionmentioning

confidence: 99%

Virtual sensors for active noise control in acoustic–structural coupled enclosures using structural sensing: Robust virtual sensor design

Halim

2011

The Journal of the Acoustical Society of America

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The work was aimed to develop a robust virtual sensing design methodology for sensing and active control applications of vibro-acoustic systems. The proposed virtual sensor was designed to estimate a broadband acoustic interior sound pressure using structural sensors, with robustness against certain dynamic uncertainties occurring in an acoustic-structural coupled enclosure. A convex combination of Kalman sub-filters was used during the design, accommodating different sets of perturbed dynamic model of the vibro-acoustic enclosure. A minimax optimization problem was set up to determine an optimal convex combination of Kalman sub-filters, ensuring an optimal worst-case virtual sensing performance. The virtual sensing and active noise control performance was numerically investigated on a rectangular panel-cavity system. It was demonstrated that the proposed virtual sensor could accurately estimate the interior sound pressure, particularly the one dominated by cavitycontrolled modes, by using a structural sensor. With such a virtual sensing technique, effective active noise control performance was also obtained even for the worst-case dynamics.

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“…The two sets of modes are then combined together, via spatial coupling coefficients, to find the response of the coupled system. However, as pointed out by Pan et al [7,8], there are two main limitations with the modal coupling theory. One is that such an approach is only suitable for weak coupling and will be inadequate in dealing with strong coupling conditions as in the cases where a very thin plate, a shallow cavity depth or a heavy medium is involved.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Analysis of Enclosed Sound Space as well as Its Coupling with Flexible Boundary Structure

Du¹,

Liu²,

Liu³

2018

Computational and Experimental Studies of Acoustic Waves

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Combustion instability is often encountered in various power systems, a good understanding on the sound field in acoustic cavity as well as its coupling with boundary flexible structure will be of great help for the reliability design of such combustion system. An improved Fourier series method is presented for the acoustic/vibro-acoustic modelling of acoustic cavity as well as the panel-cavity coupling system. The structuralacoustic coupling system is described in a unified pattern using the energy principle. With the aim to construct the admissible functions sufficiently smooth for the enclosed sound space as well as the flexible boundary structure, the boundary-smoothed auxiliary functions are introduced to the standard multi-dimensional Fourier series. All the unknown coefficients and higher order variables are determined in conjunction with Rayleigh-Ritz procedure and differential operation term by term. Numerical examples are then presented to show the correctness and effectiveness of the current model. The model is verified through the comparison with those from analytic solution and other approaches. Based on the model established, the influence of boundary conditions on the acoustic and/or vibro-acoustic characteristics of the structural-acoustic coupling system is addressed and investigated.

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The effect of fluid–structural coupling on sound waves in an enclosure—Theoretical part

Cited by 150 publications

References 0 publications

Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: Part II—Optimization of structural sensor placement

Virtual sensors for active noise control in acoustic-structural coupled enclosures using structural sensing: Part II—Optimization of structural sensor placement

Virtual sensors for active noise control in acoustic–structural coupled enclosures using structural sensing: Robust virtual sensor design

Acoustic Analysis of Enclosed Sound Space as well as Its Coupling with Flexible Boundary Structure

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