A time-domain finite volume method for the prediction of water muffler transmission loss considering elastic walls

Xuan, Liang; Liu, Yan; Gong, Junbo; Ming, Pingjian; Ruan, Zhu-Qing

doi:10.1177/1687814017690068

Cited by 6 publications

(6 citation statements)

References 19 publications

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“…For the water muffler, the TL calculation is based on the attenuation of acoustic waves considering effects of flexible test pipes. It is different from the cases in literature, 9–11 where the test pipe is not considered or considered with the rigid wall.…”

Section: Basic Theorymentioning

confidence: 86%

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Numerical analysis of the transmission loss of water muffler according to the two-load method

Gong

Jiang

Xuan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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A numerical method for the transmission loss prediction of the water muffler has been provided according to the measuring process of the two-load method. The commonly used acoustic loads can be applied in the proposed method. The accuracy of the proposed method has been proved by comparing the calculated transmission loss with that from the traditional direct predicting method. And then the proposed method is used to discuss effects of test bench on transmission loss measurement. The predicted transmission loss curves are consistent reasonably based on different test models. The location of monitors relative to the muffler inlet and outlet has little influence on the result. But the distance between the two monitors upstream or downstream should be controlled within a certain range based on the concerning frequency band and the main pipe diameter. It is found that modes of the coupled system consisting of the test pipes and the water cause extra peaks on the transmission loss curve. The influence can be reduced by arranging appropriate fixed points. The proposed method can be used to to explain the reasonability and validity of the test bench design.

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Section: Basic Theorymentioning

confidence: 86%

“…8 It is mainly caused by the ignorance of the interaction between the water and the structure. Therefore, considering the acoustic–structure interaction in the simulation process 2,9–11 may improve the accuracy of the predicted result.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the transmission loss of water muffler according to the two-load method

Gong

Jiang

Xuan

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

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“…Elsayed et al 30 investigated the effects of perforations, and baffle location and distribution, on cylindrical exhaust performance. 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.…”

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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“…[1,2] The vibration and noise in a piping system can affect the precision of the system control and the normal work functions of downstream equipment. [3] Fortunately, this noise can be sufficiently reduced to a level of the noise from other automotive sources, or even lower, by means of a well-designed muffler (also called a silencer). [4] However, a limitation exists in conventional mufflers, namely, their ability to attenuate lowfrequency noise.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, sound transmission loss (STL) of an HR in a fluid-filled piping system has been investigated. [3,10] However, for wide frequency band noise control, there is more work that needs to be done. It is a challenge to obtain a low-frequency and broadband gap with a small sized HR in the fluid-filled piping system.…”

Section: Introductionmentioning

confidence: 99%

Propagation of acoustic waves in a fluid-filled pipe with periodic elastic Helmholtz resonators

Shen

Liu

et al. 2018

Chinese Phys. B

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Helmholtz resonators are widely used to reduce noise in a fluid-filled pipe system. It is a challenge to obtain lowfrequency and broadband attenuation with a small sized cavity. In this paper, the propagation of acoustic waves in a fluid-filled pipe system with periodic elastic Helmholtz resonators is studied theoretically. The resonance frequency and sound transmission loss of one unit are analyzed to validate the correctness of simplified acoustic impedance. The band structure of infinite periodic cells and sound transmission loss of finite periodic cells are calculated by the transfer matrix method and finite element software. The effects of several parameters on band gap and sound transmission loss are probed. Further, the negative bulk modulus of periodic cells with elastic Helmholtz resonators is analyzed. Numerical results show that the acoustic propagation properties in the periodic pipe, such as low frequency, broadband sound transmission, can be improved.

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A time-domain finite volume method for the prediction of water muffler transmission loss considering elastic walls

Cited by 6 publications

References 19 publications

Numerical analysis of the transmission loss of water muffler according to the two-load method

Numerical analysis of the transmission loss of water muffler according to the two-load method

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

Propagation of acoustic waves in a fluid-filled pipe with periodic elastic Helmholtz resonators

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