A three-dimensional finite element approach for predicting the transmission loss in mufflers and silencers with no mean flow

Mehdizadeh, Omid Z.; Paraschivoiu, Marius

doi:10.1016/j.apacoust.2004.11.008

Cited by 67 publications

(31 citation statements)

References 29 publications

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“…When no mean flow is present, the BEM has been applied successfully to complicated silencers geometries [16][17][18]. Similarly, the FEM has also been used to study dissipative silencers without flow [16,19], and Mehdizadeh and Paraschivoiu [20] report a comprehensive three-dimensional approach. Clearly, using a fully three-dimensional model is very computationally expensive and the number of degrees of freedom used by Mehdizadeh and Paraschivoiu [20] appears to be excessive, at least for a uniform circular silencer.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, the FEM has also been used to study dissipative silencers without flow [16,19], and Mehdizadeh and Paraschivoiu [20] report a comprehensive three-dimensional approach. Clearly, using a fully three-dimensional model is very computationally expensive and the number of degrees of freedom used by Mehdizadeh and Paraschivoiu [20] appears to be excessive, at least for a uniform circular silencer. It is noticeable, however, that the boundary element models do not combine the effects of both mean flow and a perforated pipe, and only Peat and Rathi [21] have successfully added mean flow to a finite element model of a bulk reacting dissipative silencer.…”

Section: Introductionmentioning

confidence: 99%

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A comparison between analytic and numerical methods for modelling automotive dissipative silencers with mean flow

Kirby

2009

Journal of Sound and Vibration

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Identifying an appropriate method for modelling automotive dissipative silencers normally requires one to choose between analytic and numerical methods. It is common in the literature to justify the choice of an analytic method based on the assumption that equivalent numerical techniques are more computationally expensive. The validity of this assumption is investigated here, and the relative speed and accuracy of two analytic methods are compared to two numerical methods for a uniform dissipative silencer that contains a bulk reacting porous material separated from a mean gas flow by a perforated pipe. The numerical methods are developed here with a view to speeding up transmission loss computation, and are based on a mode matching scheme and a hybrid finite element method. The results presented demonstrate excellent agreement between the analytic and numerical models provided a sufficient number of propagating acoustic modes are retained. However, the numerical mode matching method is shown to be the fastest method, significantly outperforming an equivalent analytic technique. Moreover, the hybrid finite element method is demonstrated to be as fast as the analytic technique. Accordingly, both numerical techniques deliver fast and accurate predictions and are capable of outperforming equivalent analytic methods for automotive dissipative silencers.4

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A comparison between analytic and numerical methods for modelling automotive dissipative silencers with mean flow

Kirby

2009

Journal of Sound and Vibration

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“…3 Accurate prediction of the transmission loss (TL) is important for a well-designed muffler. For the air muffler, there are many mature theories for the prediction of TL with satisfied accuracy, such as the transfer matrix method, 4 the analytical method, 5 the finite element method (FEM), 6 and the boundary element method (BEM). 5,7 In contrast, few references have discussed the acoustic performance of the water muffler.…”

Section: Introductionmentioning

confidence: 99%

“…Combining with the frequency domain method, the FEM, 6 the BEM, 7 and the finite volume method (FVM) 10 have been applied to analyze the acoustic performance of the muffler. The FEM and the BEM are much more popular than the FVM in frequency domain, due to the wide application of some commercial codes in design.…”

Section: Introductionmentioning

confidence: 99%

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

Xuan

Liu

Gong

et al. 2017

Advances in Mechanical Engineering

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This work extends the application of the finite volume method to predict the acoustic performance of the water muffler with the consideration of elastic walls. The three-dimensional time-domain finite volume method and the improved time-domain impulse method are employed to predict the acoustic attenuation characteristics of mufflers. The present results agree well with analytical solutions and numerical results obtained by finite element method with commercial codes. The effects of different thicknesses of elastic end cavity wall, elastic tube, and cavity walls on acoustic characteristics of a water-filled Helmholtz resonator are investigated. An attempt to simplify the present method with the effective sound speed has been implemented and discussed.

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“…The same condition is used, for example, in Mehdizadeh and Paraschivoiu. 5 There are several different empirical formulas available for the impedance (e.g., see Lee 22 ), but the one by Sullivan and Crocker 21 is sufficient for our purposes. Let us denote a perforated wall in the muffler by R and assume that it separates the muffler into two distinct parts X B,1 and X B,2 .…”

mentioning

confidence: 99%

Multiobjective muffler shape optimization with hybrid acoustics modeling

Airaksinen

Heikkola

2011

The Journal of the Acoustical Society of America

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This paper considers the combined use of a hybrid numerical method for the modeling of acoustic mufflers and a genetic algorithm for multiobjective optimization. The hybrid numerical method provides accurate modeling of sound propagation in uniform waveguides with non-uniform obstructions. It is based on coupling a wave based modal solution in the uniform sections of the waveguide to a finite element solution in the non-uniform component. Finite element method provides flexible modeling of complicated geometries, varying material parameters, and boundary conditions, while the wave based solution leads to accurate treatment of non-reflecting boundaries and straightforward computation of the transmission loss (TL) of the muffler. The goal of optimization is to maximize TL at multiple frequency ranges simultaneously by adjusting chosen shape parameters of the muffler. This task is formulated as a multiobjective optimization problem with the objectives depending on the solution of the simulation model. NSGA-II genetic algorithm is used for solving the multiobjective optimization problem. Genetic algorithms can be easily combined with different simulation methods, and they are not sensitive to the smoothness properties of the objective functions. Numerical experiments demonstrate the accuracy and feasibility of the model-based optimization method in muffler design.

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A three-dimensional finite element approach for predicting the transmission loss in mufflers and silencers with no mean flow

Cited by 67 publications

References 29 publications

A comparison between analytic and numerical methods for modelling automotive dissipative silencers with mean flow

A comparison between analytic and numerical methods for modelling automotive dissipative silencers with mean flow

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

Multiobjective muffler shape optimization with hybrid acoustics modeling

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