Influence of perforation and sound-absorbing material filling on acoustic attenuation performance of three-pass perforated mufflers

Huang, Hongpu; Ji, Zhenlin; Li, Zhuoliang

doi:10.1177/1687814017748012

Cited by 8 publications

(4 citation statements)

References 14 publications

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“…Another objective of this study is to investigate the acoustic attenuation performance of three-pass perforated tube silencers in the presence of flow. This article is also a continuation of our previous work, 11 which discussed the effects of various perforation configurations on the acoustic attenuation performance of threepass perforated silencers in the absence of flow.…”

Section: Introductionmentioning

confidence: 74%

One-way fluid-to-acoustic coupling approach for acoustic attenuation predictions of perforated silencers with non-uniform flow

Huang

Chen

2019

Advances in Mechanical Engineering

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A one-way fluid-to-acoustic coupling approach which combines the computational fluid dynamics and the acoustic finite element method is employed to predict the acoustic attenuation performance of perforated silencers in the presence of non-uniform flow. This technique ensures that the convective and dissipative effects caused by fluid flow on the acoustic attenuation performance of perforated silencer can be taken into account. The comparisons between the numerical predictions and the previously published experimental measurements show the reasonably good agreements. The acoustic attenuation predictions of perforated silencers without and with flow show that (1) the effect of grazing flow on the acoustic attenuation of the straight-through perforated tube silencer is obvious at higher frequencies, while marginal in the low frequency range; (2) the bias flow enhances the acoustic attenuation performance of perforated silencers at most frequencies; (3) the grazing-bias flow reduces seriously the first resonant peak of three-pass perforated tube silencer and increases the acoustic attenuation in specific frequency range; and (4) when the grazing-bias flow in the orifices of perforated tube and bias flow in the orifices of perforated bulkheads exist simultaneously, the latter plays a leading role to the acoustic attenuation performance of three-pass perforated silencers.

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Section: Introductionmentioning

confidence: 74%

One-way fluid-to-acoustic coupling approach for acoustic attenuation predictions of perforated silencers with non-uniform flow

Huang

Chen

2019

Advances in Mechanical Engineering

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“…1,2 Due to solid bulkhead(s), it is equivalent to decrease of the neck area of the resonator and increase of the neck length, which causes resonance shifting to lower frequency. 1,2,8 The interaction of flow and sound wave leads to the decrease of acoustic resistance of the resonators. 27 Thus for the muffler with solid bulkhead(s), the low-frequency resonance peak are lowered due to the effect of the flow-acoustic coupling.…”

Section: Effect Of Mach Number For Mufflers With Various Perforated C...mentioning

confidence: 99%

“…1,2 As noise control requirements become increasingly stringent, it is important to design the mufflers with well acoustic attenuation performance. In the past few decades, several analytical and numerical methods [3][4][5][6][7][8] have been employed to predict the transmission losses of perforated hybrid mufflers. The researches only investigated the effect of geometry parameters on acoustic attenuation performance in the absence of flow.…”

Section: Introductionmentioning

confidence: 99%

Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations

Zhirong,

Zhenlin,

Yiliang

2024

Advances in Mechanical Engineering

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The three-dimensional frequency-domain linearized Navier-Stokes equations (LNSEs) with consideration of eddy viscosity are developed to evaluate the acoustic attenuation performance of perforated hybrid mufflers in the presence of non-uniform flow. The computations are performed in two steps: time averaged flow variables are acquired by using steady-state computational fluid dynamics (CFD) method and then mapped into the acoustic mesh, and the acoustic perturbation variables are obtained by solving frequency-domain LNSEs, where the sound-absorbing material is treated as an equivalent fluid with complex sound speed and density. The predictions of transmission losses of the two-pass perforated hybrid mufflers in the presence of non-uniform flow are in good consistencies with the measurements, which verifies the correctness of LNSEs. The effect of Mach numbers on acoustic attenuation performance of the mufflers with different filling densities and perforated components is investigated in detail. The transmission loss of the mufflers with various filling densities are increased by complex airflow in the lower frequency range. For the mufflers where not all components have been perforated, the flow lowers low-frequency resonance peak. The influence of complex airflow on acoustic attenuation performance of all configurations is weakened at higher frequencies.

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“…Xuan et al 31 studied the effects of cylindrical exhaust muffler TL by considering different thicknesses of the elastic wall and cavities. Hongpu et al 32 worked on a three-way exhaust using FEM method by considering the effect of absorptive material and perforations. Williams et al 33 also proposed a hybrid muffler able to provide low-frequency noise attenuation.…”

Section: Introductionmentioning

confidence: 99%

Effects of inlet-outlet positioning, muffler geometry, and baffle design on vehicle muffler performance for desired sound transmission loss

Ebrahimi-Nejad

Rahimi

Kheybari

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part D:

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A systematic comparative examination of different single-chamber and double-chamber muffler geometries, comprised of various baffle geometry and size, number of chambers, and inlet-outlet positioning was conducted to determine the most suitable geometry for size-efficient mufflers which can meet size-limitations of automotive applications, confirming enhanced transmission loss (TL). First, we considered a reference model for validation of the simulation method. Then, we objectively studied the effects of circular and rectangular baffles of different sizes on the TL of single-chamber mufflers. Next, double- and single-chamber models were compared. Consequently, to better analyze the performance of the representative benchmark double-chamber muffler, the effects of different layouts of the outlet were studied and the corresponding TL was derived, while the inlet and baffle type and size were fixed. Finally, the effect of inlet layout, considering given outlet position, baffle type, and size, was studied on the noise control performance of the muffler. Results indicate that the 75% circular baffle has a wide frequency range and high TL of 58 dB, where the 75% rectangular plate baffle has a transmission loss of 67 dB. The double-chamber muffler has a wider frequency range and a higher TL of 78 dB compared to the single-chamber muffler. Moreover, changes in the inlet-outlet of the silencer significantly affect TL. As the inlet-outlet positioning of the silencer greatly contributes to the space constraints and packaging of the vehicle components, therefore, the variations of the inlet-outlet position of the silencer in the limited space available in vehicles need to be considered as an important design parameter, considering packaging limitations and noise control performance, which can significantly affect tailpipe radiated noise.

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Influence of perforation and sound-absorbing material filling on acoustic attenuation performance of three-pass perforated mufflers

Cited by 8 publications

References 14 publications

One-way fluid-to-acoustic coupling approach for acoustic attenuation predictions of perforated silencers with non-uniform flow

One-way fluid-to-acoustic coupling approach for acoustic attenuation predictions of perforated silencers with non-uniform flow

Acoustic attenuation prediction and analysis of perforated hybrid mufflers with non-uniform flow based on frequency domain linearized Navier-Stokes equations

Effects of inlet-outlet positioning, muffler geometry, and baffle design on vehicle muffler performance for desired sound transmission loss

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