Non-linear acoustic transfer impedance of micro-perforated plates with circular orifices

Temiz, Muttalip Aşkın; Tournadre, Jonathan; Arteaga, Inés López; Hirschberg, Avraham

doi:10.1016/j.jsv.2015.12.022

Cited by 64 publications

(39 citation statements)

References 23 publications

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“…7, with a growing deviation from its value in the linear regime f H;lin toward higher frequencies for increasing SPLs. This shift occurs due to a decrease of the reactance for increasing excitation amplitudes, which is related to a reduction of the effective length by vortex shedding [15]. Since the neck geometric length is smaller in this case than for the first resonator configuration investigated, this effect is much more visible here.…”

Section: A Resonator Impedance In Nonlinear Regimementioning

confidence: 79%

“…(15). For the compressible simulations, in the case of the full resonator configuration, the inlet boundary condition is A f given by Eq.…”

Section: Setting Excitation Amplitudesmentioning

confidence: 99%

“…The present cases correspond to high Strouhal numbers Sh ≫ 1, with Sh ∈ 25-60, where Sh d o ωρ∕4μ p is the ratio of the Stokes layer thickness to the orifice diameter. The physical interpretation of the nonlinear impedance at such high Shear number values was shown [15] to be more complicated than at smaller Sh, due to complex vortex shedding effects, and requires further investigation. The resistance overprediction from the numerical methods seems to be still present in this case, even if significantly less pronounced.…”

Section: A Resonator Impedance In Nonlinear Regimementioning

confidence: 99%

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Determination of Acoustic Impedance for Helmholtz Resonators Through Incompressible Unsteady Flow Simulations

Tournadre

Martinez-Lera

Polifke

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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The present work proposes and assesses a methodology based on incompressible computational fluid dynamics simulations to study the acoustic behavior of Helmholtz resonators under a large range of excitation amplitudes. It constitutes an alternative approach to the more widespread one based on compressible flow simulations to analyze the nonlinear regime of Helmholtz resonators. In the present methodology, the resonator is decomposed into its two main components: an assumed incompressible orifice neck and a compressible backing volume. The transfer impedance of the single orifice is obtained by means of an incompressible solver of the flow equations without turbulence modeling, whereas an analytical model accounts for the compliance of the gas in the backing cavity. The proposed methodology is compared for validation purposes to both numerical results of the full compressible equations and experimental data for the complete resonator at different sound pressure levels. A good agreement between the results of the two numerical approaches could be achieved. Numerical results match also fairly well with experimental data, but a systematic overprediction of the resistance by simulations is observed. Accounting for the presence of microrounded edges, presumably present due to manufacturing processes, allows a better agreement between numerical and experimental results.

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Section: A Resonator Impedance In Nonlinear Regimementioning

confidence: 79%

“…(15). For the compressible simulations, in the case of the full resonator configuration, the inlet boundary condition is A f given by Eq.…”

Section: Setting Excitation Amplitudesmentioning

confidence: 99%

Section: A Resonator Impedance In Nonlinear Regimementioning

confidence: 99%

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Determination of Acoustic Impedance for Helmholtz Resonators Through Incompressible Unsteady Flow Simulations

Tournadre

Martinez-Lera

Polifke

et al. 2016

22nd AIAA/CEAS Aeroacoustics Conference

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“…However, when applied to apertures with sub-millimetre diameter, the resistive end-correction shows a minimum at values of Sh = O (1), which Postprint of the paper: F. Auriemma, "Acoustic performance of micro-grooved elements", Applied Acoustics 122 (2017) limits the applicability of these formulas to apertures with over-millimetre diameter. By assuming that the cross section geometry of the apertures has a minor influence on the resistive end corrections, the expression of α T given by Temiz in [21] for apertures with chamfered edges is here proposed in a modified version by using the experimental data of MGEs :…”

Section: External Partmentioning

confidence: 99%

“…where c 1 = 5.08, c 2 = −1.45 for apertures with millimetre apertures (as stated in [21]) and c 1 = 4.05, c 2 = −0.90 for sub-millimetre apertures, as in case of MGEs. In Eq.…”

Section: External Partmentioning

confidence: 99%

Acoustic performance of micro-grooved elements

Auriemma

2017

Applied Acoustics

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The acoustic performance of a new type of fibre-less sound absorber, the Micro-Grooved Element (MGE), is studied in this paper. The transfer impedance and the absorption coefficient of micro-grooved and Micro-Perforated Elements (MPEs) are measured, modelled and compared.A MGE is a double layer element that involves inlet/outlet slots and facing micro-channels engraved onto the mating surface of the layers. The main advantage of these elements is that, by means of a simple technological process, thin micro-channels with depth of less then 100µm can be easily engraved. This allows the MGEs exhibiting higher absorption coefficients compared to traditional MPEs with 300−700µm diameter of perforations. Moreover, due to the presence of surfaces surrounding the micro-channels, the MGEs show reduced resistance when exposed to high level of sound excitation. In this perspective, the performance of a MGE is more stable than the one of a MPE provided with the same porosity.A number of different MGEs with varied internal geometries has been tested at different excitation levels. The acoustics of the micro-channels is treated in details, the impedance end corrections are determined and the non-linear effects are accounted for. The linear behaviour of MGEs is described by adapting the models for slit-shaped perforated elements (SSEs). The quasi-and non-linear behaviours are expressed as a function of the Shear number and Strouhal number by curve fitting the experimental results.

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Absorption and Transmission of Boundary Layer Noise through Micro-Perforated Structures: Measurements and Modellings

Maury

Bravo

Mazzoni

2021

Flinovia—Flow Induced Noise and Vibration Issues and Aspects-Iii

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Non-linear acoustic transfer impedance of micro-perforated plates with circular orifices

Abstract: Non-linear acoustic transfer impedance of micro-perforated plates with circular orifices

Cited by 64 publications

References 23 publications

Determination of Acoustic Impedance for Helmholtz Resonators Through Incompressible Unsteady Flow Simulations

Determination of Acoustic Impedance for Helmholtz Resonators Through Incompressible Unsteady Flow Simulations

Acoustic performance of micro-grooved elements

Absorption and Transmission of Boundary Layer Noise through Micro-Perforated Structures: Measurements and Modellings

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