Active control of sound transmission through a double-leaf partition by volume velocity cancellation

Pan, Xiaoyi; Sutton, T.J.; Elliott, Stephen J.

doi:10.1121/1.423899

Cited by 26 publications

(30 citation statements)

References 8 publications

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“…Much research work has been carried out on the unribbed double-panel structure [3][4][5][6][7], and little attention [2] has been given to the ribbed case. In order to fill these theoretical gaps, Ma [8] presents an analytical investigation on the physical mechanism of active control of sound transmission through a single rib stiffened double-panel system, using the cavity control approach.…”

Section: Introductionmentioning

confidence: 99%

“…As a continuous work, the model for the orthogonally two ribs stiffened case in this research is also established using the method involved in Ref. [8].Compared with the unribbed double-panel system [4][5][6][19][20][21], the physical mechanism of active control of noise transmission presents additional prominent differences for the single ribbed case. Due to the remarkable free vibration characteristic for the ribbed plate (the modes, which have the same modal index along the rib direction, can couple with each other [18]), the differences present as the following two aspects [8].…”

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confidence: 99%

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Active Control of Sound Transmission through Orthogonally Rib Stiffened Double-Panel Structure: Mechanism Analysis

Chen

2019

Applied Sciences

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Featured Application: Active double-panel sound insulation structure can be applied as potential noise control technic in aviation and navigation to actively control the low frequency sound transmission into the cabin.Abstract: Physical mechanisms of active control of sound transmission through orthogonally two ribs stiffened double-panel structure are investigated. This is the continued work of the single rib stiffened case. For the orthogonally two ribs stiffened case, four different cluster mode groups can be coupled with each other, due to the interlaced coupling effects of the horizontal and vertical ribs. One cavity mode can couple with and transmit sound energy to any type of base plate mode of the radiating ribbed plate. Consequently, the main differences of the control mechanism, when compared with the single ribbed case, lie in two aspects. One is that a novel mechanism appears. That is, suppressing and rearranging the cavity modes simultaneously achieves the suppression of the base plate modes. The other is that rearrangement of the cavity modes to rearrange the base plate modes for achieving sound radiation cancellation almost does not appear. The reason is that all types of cavity mode can couple with any one of the base plate modes due to the coupling effects of the two ribs. There is only a need to rearrange several important cavity modes to achieve suppressing the base plate mode of the radiating ribbed plate. Appl. Sci. 2019, 9, 3286 2 of 17 pay close attention to distinctly explore the elementary physical nature of active control. However, the double-layer cabin walls are usually the classical orthogonally n-ribbed plate. In order to improve the engineering relevance of the analytical research, this study further presents a more practical structure which refers to the orthogonally two ribs stiffened double-panel system. Hence, this research is continued from the work in Ref. [8]. The aim of this paper is to further explore the active control mechanisms of such a structure, which may support engineering application of this technique in the future. The orthogonal ribbed case is only concerned with one horizontal and one vertical rib. Although such a structure is not in accord with the engineering applications, it seems to be more practical. The purpose of this is to simplify the investigation. Understanding the physical nature of active control in orthogonal ribbed cases may provide better understanding of complicated mechanisms involved in an orthogonal n-ribbed case [9].Many techniques [10][11][12][13][14][15] have been proposed to accurately predict free vibration of the ribbed plate. Some other techniques [2,16] have been also applied to model complicated double-panel structures composed of rib stiffened plates. These contributions deepen the comprehending of the vibration characteristics of the rib stiffened plate and rule of sound energy transmission through these structures, which offers assistance for noise and vibration control engineering. One new modeling approach proposed recently i...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Active Control of Sound Transmission through Orthogonally Rib Stiffened Double-Panel Structure: Mechanism Analysis

Chen

2019

Applied Sciences

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“…VVC has been implemented by using three control strategies; open-loop feedforward, closed-loop proportional, and closed-loop optimal control and are compared for active noise control by Kamman and Naghshineh. 16 By using VVC, Pan et al 17 studied the control of sound transmission through a double-leaf partition. They compared the result between a single point force actuator and matched uniform force actuator.…”

Section: Introductionmentioning

confidence: 99%

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Sahu

Tuhkuri

Reddy

2015

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, active control of harmonic sound transmitted through a soft-core sandwich panel into a rectangular enclosure is studied. As it has already been shown for the low frequency region, the noise transmission through a soft-core sandwich panel mainly occurs due to the flexural and the dilatational modes. Therefore, in this study, volume velocity cancellation control strategy is used to control these modes, and achieve sound attenuation in a broad frequency range. Point force and uniformly distributed force actuators are used as the secondary actuator to cancel the volume velocity of the bottom faceplate, which opens to the cavity, of the sandwich panel. Cancelling the net volume velocity of the bottom faceplate is compared not only in terms of the reduction in sound transmission through the sandwich panel into cavity but also in terms of the faceplate velocities. Also, the effectiveness of the volume velocity cancellation strategy has been studied for different values of isotropic loss factor of the core. Sound transmission into the cavity has also been calculated by considering the effect of cavity pressure on the sandwich panel. Numerical studies indicate that the active control method controls both the flexural and the dilatational modes of the sandwich panel and therefore, attenuates significant amount of sound pressure inside the cavity irrespective of the isotropic loss factors of the viscoelastic core in a broad frequency range. Also a finite element study has been done in the commercially available COMSOL Multiphysics software to compare with the analytical results.

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“…Generally, for the double-wall structure with a shallow gap, the strong coupling of the mass-air-mass will deteriorate sound behavior at low frequencies, which leads to the rapid development of using active techniques for noise control [7][8][9][10][11][12][13][14][15]. Some typical control strategies include acoustic control using microphones and loudspeakers, vibration control using PZT actuators and PVDF sensors, and etc.…”

Section: Introductionmentioning

confidence: 99%

Noise control of an acoustic enclosure covered by a double-wall structure with shallow gap: Design of resonator-like cavities

2010

Applied Acoustics

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Active control of sound transmission through a double-leaf partition by volume velocity cancellation

Cited by 26 publications

References 8 publications

Active Control of Sound Transmission through Orthogonally Rib Stiffened Double-Panel Structure: Mechanism Analysis

Active Control of Sound Transmission through Orthogonally Rib Stiffened Double-Panel Structure: Mechanism Analysis

Active attenuation of sound transmission through a soft-core sandwich panel into an acoustic enclosure using volume velocity cancellation

Noise control of an acoustic enclosure covered by a double-wall structure with shallow gap: Design of resonator-like cavities

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