Application of Micro-Perforated Panels to Attenuate Noise in a Duct

Liu, J.; Herrin, D. W.; Seybert, A. F.

doi:10.4271/2007-01-2196

Cited by 12 publications

(2 citation statements)

References 2 publications

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“…While silencers can reduce sound emissions, they often lead to additional pressure loss and high drag coefficients, which limits their use in ventilation systems. Beside that, space consumption and hygienic regulations might also play a role (e.g., foams are resctricted due to possible accumulation of bacteria [19] etc.). Researchers have explored solutions such as micro-perforated sound absorbers and mode filters [20,21] to overcome these issues.…”

Section: Introductionmentioning

confidence: 99%

Design of low drag reactive silencers based on the bound states in the continuum

Hruka,

Krpenský,

Bednařík

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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The phenomenon of bound states in the continuum and leaky resonances is employed to design a reactive silencer. It is targeted to prevent a significant spectral line from propagating in a flow-duct while maintaining low pressure drop and installation space (without any lateral extensions). The quasi bound states are achieved by tuning the geometrical parameters of thin plates embedded in a waveguide with dimensions and flow velocities typical for ventilation systems. In general, the procedure works for waveguides with plane wave propagation in the low Mach number regime. An optimization by evolution strategies used for this purpose is described and illustrated on two specific examples.

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Section: Introductionmentioning

confidence: 99%

Design of low drag reactive silencers based on the bound states in the continuum

Hruka,

Krpenský,

Bednařík

et al. 2024

Proceedings of the 10th Convention of the European Acoustics Association Forum Acusticum 2023

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show abstract

“…7-9. Recently, there has also been interest in using microperforated lining materials in flow-duct noise control applications. [10][11][12][13][14][15][16] Further, microperforated materials may be incorporated into multi-layer systems to enhance particular aspects of the system performance. 17,18 The theory of microperforated panels has also been extended to allow for the effect of panel flexibility.…”

Section: Introductionmentioning

confidence: 99%

Transfer impedance of microperforated materials with tapered holes

Herdtle

Bolton²,

Kim³

et al. 2013

The Journal of the Acoustical Society of America

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It has been previously shown that relatively simple computational fluid dynamics (CFD) models can be used to calculate the transfer impedances, including the associated end corrections, of microperforated panels. The impedance is estimated by first calculating the pressure difference across a single hole when a transient input velocity is imposed, and then Fourier transforming the result to obtain the impedance as a function of frequency. Since the size of the hole and the dimensions of the inlet and outlet channels are very small compared to a wavelength, the flow through the hole can be modeled as incompressible. By using those procedures, Bolton and Kim extended Maa's classical theory to include a resistive end correction for sharp-edged cylindrical holes which differs from those previously proposed by the inclusion of a static component. Here it is shown that CFD models can also be used to compute end corrections for tapered holes. Since practical experimental characterization of perforated materials often involves measurement of the static flow resistance, a closed form empirical equation for that quantity has been developed. Finally, it is shown that configurations having equivalent static flow resistances can yield different acoustic absorptions.

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Sound Package

2018

Noise and Vibration Control in Automotive Bodies

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Application of Micro-Perforated Panels to Attenuate Noise in a Duct

Cited by 12 publications

References 2 publications

Design of low drag reactive silencers based on the bound states in the continuum

Design of low drag reactive silencers based on the bound states in the continuum

Transfer impedance of microperforated materials with tapered holes

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