On the attached length of orifices

Komkin, A. I.; Mironov, M. A.; Yudin, S. I.

doi:10.1134/s1063771012050090

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…Similar investigations but for cylindrical cavity were described in [12]. The accuracy of determining the resonant frequency at 2 % was obtained in this article.…”

Section: Discussionsupporting

confidence: 78%

Research of the Resonance Properties of Helmholtz Resonators

et al. 2020

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The object of research. Process of oscillation of the Helmholtz resonators. Investigated problem. Differences between some formulas for the calculation of the resonant frequency of the Helmholtz resonator and the most accurate of them were established. The effect of acoustic design on the Helmholtz resonator frequency value and influence of the attached air mass between the neck of the Helmholtz resonator and free field were investigated. The main scientific results. As a result of a numerical experiment, analytical ratios were obtained that allow obtaining the most accurate results. One of them is the most optimal for calculating the resonator resonant frequency in a free field, and in this case, less than 1 % inaccuracy level can be achieved, given that r/R<0.25. Other one allows to achieve the same low inaccuracy level for a resonator located in an acoustically rigid shield, given that r/R<0.25. Research has shown that the location of the resonator in an acoustically rigid shield leads to significant changes in natural resonance frequency value. The area of practical use of the research results. The detailed research of previously unexplored properties of resonators will make it possible to improve the algorithms for the development of metamaterials, to discover additional parameters with which it is possible to control the characteristics of the metamaterial. Scope of the innovative technological product. Such resonators are used as the basic elements in metamaterials, as structural elements of the sound-absorbing panels, in acoustic mufflers.

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“…Similar investigations but for cylindrical cavity were described in [12]. The accuracy of determining the resonant frequency at 2 % was obtained in this article.…”

Section: Discussionsupporting

confidence: 78%

Research of the Resonance Properties of Helmholtz Resonators

et al. 2020

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“…The results obtained, for circular geometries, by Kergomard et al 1989 [14] (see section 6. An analytical inversion of the sigmoid function leading to the smallest mean square deviation with data from Komkin et al [27] (mean values obtained for ξ = 0.100, ξ = 0.125 and ξ = 0.200) is obtained with: c = 0.13 and d = 1.2. ε 0 (h)/r, with parameters reported above, as a function of h/r (with a logarithmic scale) is plotted in figure 9.…”

Section: Influence Of the Thicknessmentioning

confidence: 75%

Length Correction of 2D Discontinuities or Perforations at Large Wavelengths and for Linear Acoustics

Jaouen¹,

Chevillotte²

2018

Acta Acustica united with Acustica

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This work focuses on the length correction due to radiation effect of a duct discontinuity or at the surface of a perforated plate in the linear acoustic domain and at large wavelengths. Two results are obtained from the comparison of models used in the literature for different geometries of duct discontinuities or perforations. First, the mode-coupling at the discontinuity between two ducts or a perforated plate and air is negligible for low frequencies. Second, all consistent models of the length correction proposed so far, for any geometries except slit-like, are similar when plotted as a function of the square root of the perforation rate (the ratio of the duct cross-section areas for ducts). These two results imply the effect of the thickness of the ducts or the perforated plate can be accounted for in the length correction expression independently from other geometric variables. A single approximate formulation for all geometries of perforations or duct discontinuities, except slit-like geometries, is proposed for practical uses.

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“…Helmholtz resonators (HRs) have also been used in literature [8,9] as acoustic absorbers, but only provide a good absorption coefficient in a small frequency band, thus limiting their application for broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

On the assembly of Archimedean spiral cavities for sound absorption applications: Design, optimization and experimental validation

Sousa

Deckers

Claeys

et al. 2021

Mechanical Systems and Signal Processing

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This work presents the design, optimization and combination of fully parameterized Archimedean spiral cavities (ASCs) as acoustic resonators, in order to achieve perfect absorption at frequencies below 1000 Hz while using a completely modular design. The assembly of two ASCs in the same system is also presented. An optimization is performed and results are verified through Finite Element Analysis (FEA) and validated experimentally for almost perfect absorption peaks at 700 Hz and 800 Hz. A good agreement is achieved between theory, simulation and experiments.

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On the attached length of orifices

Cited by 14 publications

References 12 publications

Research of the Resonance Properties of Helmholtz Resonators

Research of the Resonance Properties of Helmholtz Resonators

Length Correction of 2D Discontinuities or Perforations at Large Wavelengths and for Linear Acoustics

On the assembly of Archimedean spiral cavities for sound absorption applications: Design, optimization and experimental validation

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