Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances

Lee, Y.Y.; Lee, Eric Wai Ming

doi:10.1016/j.ijmecsci.2007.01.008

Cited by 60 publications

(32 citation statements)

References 16 publications

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“…The effects of various parameters such as the boundary condition, incidence angle, and curvature on absorption were studied. The predicted results for the single/double layer absorbers agreed well with the measurements [20].…”

Section: Absorption Controlsupporting

confidence: 82%

Noise control technology for generator sets in enclosures

Zhang

Yang

Ren-yuan

2008

Front. Mech. Eng. China

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Currently, noise pollution is an environmental problem all over the world. The health and life of human beings are affected by loud noise from high power generator sets. To reduce such noise, a sound-attenuated enclosure is widely used for its high performance and convenient usage. By installing equipment in an enclosure, noise is controlled and prevented from radiating. In this paper, noise control techniques for enclosures are presented. Enclosure development trends are predicted.

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Section: Absorption Controlsupporting

confidence: 82%

Noise control technology for generator sets in enclosures

Zhang

Yang

Ren-yuan

2008

Front. Mech. Eng. China

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“…11,12 Suitable choices of the MPP and air layer constituent parameters such as perforation ratio, diameter, holes interspacing, and thickness can bring these extra peaks closer together and so widen the absorption bandwidth. 13 Bravo et al 12 have shown that the magnitude and phase of the air-frame relative velocity over the MPP of a single layer absorber determines the beneficial or detrimental effect of these resonances.…”

mentioning

confidence: 99%

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

Bravo

Maury

Pinhède

2013

The Journal of the Acoustical Society of America

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Theoretical and experimental results are presented into the sound absorption and transmission properties of multi-layer structures made up of thin micro-perforated panels (ML-MPPs). The objective is to improve both the absorption and insulation performances of ML-MPPs through impedance boundary optimization. A fully coupled modal formulation is introduced that predicts the effect of the structural resonances onto the normal incidence absorption coefficient and transmission loss of ML-MPPs. This model is assessed against standing wave tube measurements and simulations based on impedance translation method for two double-layer MPP configurations of relevance in building acoustics and aeronautics. Optimal impedance relationships are proposed that ensure simultaneous maximization of both the absorption and the transmission loss under normal incidence. Exhaustive optimization of the double-layer MPPs is performed to assess the absorption and/or transmission performances with respect to the impedance criterion. It is investigated how the panel volumetric resonances modify the excess dissipation that can be achieved from non-modal optimization of ML-MPPs.

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“…Similar to other structural-acoustic problems, the aforementioned problem did not consider the structural nonlinearity and non-rigid acoustic boundary. In fact, there have been many research works about linear structural-acoustics (e.g., [2][3][4]) and non-linear structural vibrations (e.g. [5][6][7]).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Vibration Response of a Rectangular Tube with a Flexible End and Non-Rigid Acoustic Boundaries

Lee¹

2016

Preprint

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This paper addresses the analysis for the nonlinear vibration response of a rectangular tube with a flexible end and non-rigid acoustic boundaries. This is a further work of the linear structural acoustic problem in a well-known acoustic book. In fact, the acoustic boundaries of an enclosed space sometimes are non-rigid and the structural vibration responses are nonlinear. These two points are the focuses of this paper. The multi-level residue harmonic balance method is applied to this nonlinear structural acoustic problem. The results obtained from the multi-level residue harmonic balance method and numerical method are generally in good agreement. The effects of excitation magnitude, tube length, and phase shift parameter etc. are examined.

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Widening the sound absorption bandwidths of flexible micro-perforated curved absorbers using structural and acoustic resonances

Cited by 60 publications

References 16 publications

Noise control technology for generator sets in enclosures

Noise control technology for generator sets in enclosures

Enhancing sound absorption and transmission through flexible multi-layer micro-perforated structures

Nonlinear Vibration Response of a Rectangular Tube with a Flexible End and Non-Rigid Acoustic Boundaries

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