A network approach for analysis of silencers with/without absorbent material

Wang, Chao‐Nan; Wu, Chia-Hsin; Wu, Tzann-Dwo

doi:10.1016/j.apacoust.2007.12.006

Cited by 30 publications

(4 citation statements)

References 10 publications

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“…The Helmholtz resonator theory can be used to determine the minimum volume of the damper and to determine the natural frequency of the damper, however, for the correct analysis of acoustic phenomena such as standing waves, a more advanced model is needed, taking into account the long transmission line effect. Therefore, models with distributed parameters (continuous system approach) should be used [2,21,22]. This approach is based on the plane wave equation in one dimension.…”

Section: Analytical Modelmentioning

confidence: 99%

Influence of Boundary Conditions on the Accuracy of Pulsation Dampers Characteristics in Analytical Models

Warzyńska

Siwulski

2021

TJFP

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A pressure pulsation phenomenon in positive displacement machinery and resulting from that noise and vibration problems are well-known and still unsolved issues. The article concerns modeling pressure pulsation dampers used for fluid machinery, in particular in gas systems. The currently used mathematical models based on the plane wave theory are verified in the special laboratory conditions with no flow and no wave reflections at the system outlet. The use of a compressor as an excitation source significantly influences the characteristics of a damper installed in a system. In this study, a measurement of common type dampers transmission loss characteristics with the use of pressure transducers is proposed. The article discusses the influence of boundary conditions in analytical models based on the plane wave theory on the accuracy of dampers characteristics. Basing on the measurements results some improvements in the analytical model are proposed.

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Section: Analytical Modelmentioning

confidence: 99%

Influence of Boundary Conditions on the Accuracy of Pulsation Dampers Characteristics in Analytical Models

Warzyńska

Siwulski

2021

TJFP

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“…Other works analyzed more complex perforated tube mufflers [9][10][11][12][13], while others [14][15][16] considered the temperature gradient effects on a muffler's performance. Additional works discussed exactly how sound absorbent material influences the noise reduction of a silencer [17][18]. Although most of the accuracy of the analyses is satisfactory when compared with the experimental measurements, for most of the above works, their theoretical approaches did not include flow velocity.…”

Section: Introductionmentioning

confidence: 96%

Flow Induced Aerodynamic Noise Analysis of Perforated Tube Mufflers

Wang¹,

Tse²,

Chen³

2012

J. mech.

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Despite the analysis of muffler performance for many years, most works focus mainly on reducing inlet sound and fail to consider the flow effect. Most of their results correlate well with the experimental measurements. Subsequent works have considered the mean flow effect. Owing to Doppler's effect, transmission loss curve of the muffler will shift in its corresponding frequency. However, the correlation is worse than the experimental results since the flow induced noise does not include in the analysis. This work elucidates how flow induced noise affects muffler performance by analyzing a uniform flow that passes through perforated mufflers. The flow field is calculated with the CFD method, followed by evaluation of the aerodynamic noise based on the simulation results. Additionally, the procedure is simplified by computing and comparing only the total sound power induced by the flow in the muffler interior. Two muffler types, Helmholtz resonator and plug perforated tube muffler, are analyzed and discussed.

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“…Over the past few decades, a considerable number of studies have been carried out on the performance of single-inlet and -outlet mufflers via different numerical analyses, such as the finite element method (FEM) [1][2][3], the boundary element method (BEM) [4][5][6][7][8] and plane wave theory [9][10][11][12]. The two schemes, FEM and BEM, are widely adopted for acoustic attenuation over the frequency range of interest, including higher-order mode effects.…”

Section: Introductionmentioning

confidence: 99%

“…The transfer matrix method [5][6][7][8][9][10][11][12] is a widely used technique for predicting the performance of mufflers; however, this technique is limited in studying mufflers with single-inlet and -outlet. 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.…”

Section: Introductionmentioning

confidence: 99%

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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A network approach for analysis of silencers with/without absorbent material

Cited by 30 publications

References 10 publications

Influence of Boundary Conditions on the Accuracy of Pulsation Dampers Characteristics in Analytical Models

Influence of Boundary Conditions on the Accuracy of Pulsation Dampers Characteristics in Analytical Models

Flow Induced Aerodynamic Noise Analysis of Perforated Tube Mufflers

Application of Fast Multipole Method for Parallel Mufflers

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