Transmission loss prediction on a single-inlet/double-outlet cylindrical expansion-chamber muffler by using the modal meshing approach

Wu, Chengjun; Wang, X.J.; Tang, H.B.

doi:10.1016/j.apacoust.2006.06.011

Cited by 46 publications

(21 citation statements)

References 21 publications

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“…Compared with the research of Wu et al[23][24][25][26], there is considerable validity in this study.The parallel mufflers with different lengths of expansion chambers are analyzed, and shown inFig. 5.…”

mentioning

confidence: 65%

“…The modal meshing approach [23][24][25][26], which is based on the concepts of Munjal [27], was adopted by Wu et al for the performance of a cylindrical expansion-chamber muffler with singleinlet and double-outlet, but it encounters difficulty in carrying out the transmission loss of complicated mufflers. For this reason, the notion of the transfer function [28,29] is used in this study for predicting the performance of mufflers with double-outlet.…”

Section: Introductionmentioning

confidence: 99%

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Application of Fast Multipole Method for Parallel Mufflers

Wu¹,

Wang²

2012

J. mech.

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The purpose of this study is to examine the acoustic performance of parallel simple expansion mufflers by a new approach for an acceleration of computational time required. The fast multipole method separated the field points and source points into two terms by means of addition theorem. When the boundary is divided into uniform meshes, the integration of source element can be calculated fast. Therefore, the fast multipole method, when compared with the boundary element method, reduces CPU time from an order of N 2 to Nlog  N, where N is the number of unknowns and  is a constant. The numerical results have been compared with experiments and analytical approaches based on pressure and velocity continuity, as well as the modal meshing approach; the results clearly show that the agreements are good.

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mentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Application of Fast Multipole Method for Parallel Mufflers

Wu¹,

Wang²

2012

J. mech.

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“…The flow-meter adopted to regulate the mass-flow is a Brooks Smart Mass Flow 5853S. The flow-meter is connected to a home-made mufflercollector very similar to the one proposed by [19]. It is designed in a single-inlet/triple-outlet configuration, to split the main mass-flow in three equivalent flows.…”

Section: Air Supply Systemmentioning

confidence: 99%

Wall pressure fluctuations in rectangular partial enclosures

Pagliaroli

Camussi

2015

Journal of Sound and Vibration

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“…This phenomenon is used in mufflers by varying its length and diameter to obtain maximum attenuation at the desired frequency. Transmission loss is an important output parameter [4] for any muffler as it gives us the information about the sound level being attenuated. Various approaches have been developed to predict the transmission loss in the muffler [5].…”

Section: Introductionmentioning

confidence: 99%

“…Finite element method (FEM) is a three-dimensional numerical technique, which is more accurate [9] but requires more time to predict the transmission loss as compared to plane wave theory. Boundary element method (BEM) [9] and modal mesh techniques [4] are accurate methods and are used for predicting transmission loss for mufflers.…”

Section: Introductionmentioning

confidence: 99%

Effect of geometric parameters on the acoustical performance of single inlet single outlet expansion chamber muffler

Nag

Gupta

Dhar

2016

2016 International Conference on Electrical, Electronics, and Optimization Techniques (ICEEOT)

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Muffler is an important component in any machinery where sound is needed to be muffled or attenuated. Mufflers of various geometric configurations are available with main focus on getting maximum transmission loss without having undesirable impact on back pressure. This paper predicts the acoustical performance of a single inlet single outlet expansion chamber muffler. Finite element method is used to predict the transmission loss of the muffler at different geometrical parameters and then these results are compared with the results obtained from the plane wave theory. Guidelines are also suggested for better attenuation by comparing the results obtained by varying the geometry. Finite element pressure plots at some of the critical frequencies are plotted to demonstrate the wave propagation and wave inhibition phenomenon. This study is carried for the frequency range of 50 Hz to 1500 Hz.Keywords-transmission loss; finite element method; single inlet single outlet expansion chamber muffler; acoustic performance.

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Transmission loss prediction on a single-inlet/double-outlet cylindrical expansion-chamber muffler by using the modal meshing approach

Cited by 46 publications

References 21 publications

Application of Fast Multipole Method for Parallel Mufflers

Application of Fast Multipole Method for Parallel Mufflers

Wall pressure fluctuations in rectangular partial enclosures

Effect of geometric parameters on the acoustical performance of single inlet single outlet expansion chamber muffler

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