Evaluations of acoustic damping performances of double-layer in-duct perforated plates at low Mach and Helmholtz number

Guan, Di; Zhao, Dan; Li, Junwei; Li, J

doi:10.1121/1.5134063

Cited by 19 publications

(8 citation statements)

References 46 publications

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“…For double-layer in-duct perforated plates, acoustic damping performances are studied at low Mach and Helmholtz number to evaluate the effects of Mach, the porosities of the front and back plates, and the axial distance between these two plates in (Guan et al ., 2019b). It is found that sound absorption coefficient is periodically changed over the interested range of Helmholtz number, when Mach = 0.…”

Section: Simulation Of the Sound Absorption Performancementioning

confidence: 99%

Sound absorption performance of composite structures from a kind of lightweight ceramic foam with perforated plate

Liu,

Song,

Sun

2023

MMMS

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PurposeThe purpose of this paper is mainly to know: (1) the sound absorption coefficient of porous composite structures constituted by a new kind of lightweight ceramic foam and perforated plate; (2) the availability of an equivalent porous material model, recently proposed by the present author, to these composite structures in sound absorption.Design/methodology/approachA kind of lightweight ceramic foam with bulk density of 0.38–0.56 g·cm-3 was produced by means of molding, drying and sintering. The effect of stainless steel perforated plate on sound absorption performance of the ceramic foam was investigated by means of JTZB absorption tester.FindingsThe results indicate that the sound absorption performance could be obviously changed by adding the stainless steel perforated plate in front of the porous samples and the air gap in back of the porous samples. Adding the perforated plate to the porous sample with a relatively large pore size, the sound absorption performance could be evidently improved for the composite structure. When the air gap is added to the composite structure, the first absorption peak shifts to the lower frequency, and the sound absorption coefficient could increase in the low frequency range.Originality/valueBased on the equivalent porous material model and the “perforated plate with air gap” model, the sound absorption performance of the composite structures can be simulated conveniently to a great extent by using Johnson-Champoux-Allard model.

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Section: Simulation Of the Sound Absorption Performancementioning

confidence: 99%

Sound absorption performance of composite structures from a kind of lightweight ceramic foam with perforated plate

Liu,

Song,

Sun

2023

MMMS

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“…The noise damping performance of a tested sample/material is characterized by using sound absorption coefficient Δ a ( ω ), which is defined as 22 where x 1 and x 2 are the axial locations sensor 1 and sensor 2 in the wave tube, and H(ω) is the transfer function between the two sensors. The sound absorption coefficient indicates the ratio of the incident waves acoustical energy that is absorbed by the tested materials.…”

Section: Experiments Proceduresmentioning

confidence: 99%

Improved low-frequency sound absorption of porous silicone rubber resonance sheet with periodic cavities

Peng

Zhao

Cheng

et al. 2022

Journal of Low Frequency Noise, Vibration and Active Control

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Since the development of advanced sound absorption material is highly critical in noise control applications, anechoic coatings, and acoustic metamaterials, both fabrication technology and structure design are significant in the achievement of broadband and strong absorption performance in the low sound frequency range. In this work, the silicone rubber resonance absorption sheet with periodic cavities is prepared via inserting cylindrical steel strips with different diameters into the non-vulcanized colloid. Effects of size and arrangement of cavities on the sound absorption properties, as well as the corresponding mechanical properties, are investigated and discussed. Results indicate that periodic pattern designs could further improve the low-frequency sound absorption performance of silicone rubber foams, and increasing the cavity diameter could significantly improve the sound absorption efficiency of the prepared samples in the middle- and low-frequency range from 125 to 2000 Hz. Particularly, increasing the number of the layered cavities could also improve the sound absorption efficiency. The consumption of sound energy in the prepared silicone rubber resonance sheet is discussed, which could be attributed to the synergistic effect in different spatial scales.

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“…Maintaining Helmholtz resonators' peak damping performance with operating conditions being changed could be achieved by applying a feedback control strategy. Zhao et al 10 demonstrated how to actively passive control of thermoacoustic instabilities 14 by actively optimizing the damping peaks of multiple Helmholtz resonators. The optimum frequency at which they produce the maximum damping is varied by altering their geometry such as varying the area of the Helmholtz resonator neck.…”

Section: Introductionmentioning

confidence: 99%

Numerical optimizing noise damping performances of Helmholtz resonators with a rigid baffle implemented at neck in presence of a grazing flow

Guan

2022

Journal of Low Frequency Noise, Vibration and Active Control

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As an applicable noise attenuator, Helmholtz resonator is mainly used to dampen acoustic noise at low- and medium-frequency ranges. It is typically implemented in combustion-engines and gas turbines to dampen thermoacoustic instabilities. However, it has a narrow effective frequency range and does not work effectively at off-design conditions. In this work, we consider a modified structured Helmholtz resonator (HR) at its neck by applying a rigid baffle in order to maximize its’ noise damping effect and to broaden its frequency bands. The resonator is attached to a cylindrical duct/pipe in presence of a mean flow (grazing flow), aiming to simulate the practical engines flow configuration. For this, a two-dimensional frequency domain numerical model is developed by using COMSOL V5.3. The numerical simulations are carried out by solving the linearized Navier–Stokes equation in frequency domain with low computational cost and time. In order to obtain an optimum design in terms of the maximum noise damping performances, 10 new different configurations/designs are proposed. The effects of 1) the single baffle attached to the upstream or downstream sidewall of the neck ends, that is, Design A, B, C, and D or double baffles, that is, Design E, F, G, and H), 2) the baffle implementation location, 3) the length of the rigid baffle, and 4) the grazing flow low Mach number are evaluated and compared. It is found that Design C is associated with improved TL by 50% and decreased resonant frequency by 20% comparing with the conventional HR. The present preliminary study shows that Design C is the better design. Further experimental and optimization researches are needed to sheds light on the optimum design of a Helmholtz resonator with neck structure being modified, as there is a low Mach number grazing flow.

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Evaluations of acoustic damping performances of double-layer in-duct perforated plates at low Mach and Helmholtz number

Cited by 19 publications

References 46 publications

Sound absorption performance of composite structures from a kind of lightweight ceramic foam with perforated plate

Sound absorption performance of composite structures from a kind of lightweight ceramic foam with perforated plate

Improved low-frequency sound absorption of porous silicone rubber resonance sheet with periodic cavities

Numerical optimizing noise damping performances of Helmholtz resonators with a rigid baffle implemented at neck in presence of a grazing flow

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