Transmission loss prediction on SIDO and DISO expansion-chamber mufflers with rectangular section by using the collocation approach

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

doi:10.1016/j.ijmecsci.2006.11.007

Cited by 20 publications

(7 citation statements)

References 18 publications

(31 reference statements)

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“…Wu et al. 14 proposed a numerical method for the acoustic performance prediction on single-inlet/double-outlet and double-inlet/single-outlet expansion-chamber mufflers with rectangular sections. Wu et al.…”

Section: Introductionmentioning

confidence: 99%

“…Pujari et al 13 studied acoustical and engine performance of silencers which was predicted using FEM/BEM and computational fluid dynamics (CFD) techniques; the results were validated by experimental studies. Wu et al 14 proposed a numerical method for the acoustic performance prediction on single-inlet/ double-outlet and double-inlet/single-outlet expansion-chamber mufflers with rectangular sections. Wu et al 15 proposed a formulation for the acoustic performance prediction on a single-inlet and double-outlet cylindrical expansion-chamber muffler by using the modal meshing approach and the plane wave theory.…”

Section: Introductionmentioning

confidence: 99%

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A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design

Seçgin

Arslan

Birgören

2020

Journal of Low Frequency Noise, Vibration and Active Control

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This study aims to optimize the acoustic performance of a silencer with baffles having extension tubes. It considers the position, the number and the extension geometry of the baffles as design variables and sound transmission loss as the response variable to be optimized. The finite element analysis software ABAQUS is used to compute the response values for different combinations of design variables. The statistical design of the experiments provides a mathematical framework for such computer design optimization studies with multiple design variables. Yet, it has not been used for design optimization of silencers in the literature. In this study, simplex centroid mixture designs, a type of response surface method, are used in the statistical design of experiments. They can provide faster convergence on the optimization problem. The design involves one, two and three baffles with different positions and extension tube lengths. The outcome of this study indicates that obtaining ABAQUS software solutions at design points for each baffle number allows constructing nonlinear regression equations expressing the response variable as a function of the design variables. The equations obtained are then used to compute optimal values. Further evaluation of these equations indicates that better sound transmission loss values are obtained when the baffle number is increased, and the lengths of the extension tubes are set at high values. Moreover, it is possible to use the statistical experimental design approach implemented in this study for other types of silencers with different baffle geometries and design variables.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design

Seçgin

Arslan

Birgören

2020

Journal of Low Frequency Noise, Vibration and Active Control

View full text Add to dashboard Cite

show abstract

“…C.J. Wu et al [4] made the performance prediction of single-inlet/double-outlet and double-inlet/single outlet expansion chamber mufflers Another researcher Ying-li Shao [5] studied a new type of muffler using both counter phase -counteract and split-gas rushing. The exhaust gas is introduced into the chamber by means of a U-shaped bypass pipe.…”

Section: Introductionmentioning

confidence: 99%

Effects of Parameters of Helmholtz Resonator on Transmission Loss of Hybrid Muffler

Zaw¹,

Abu²,

Fawazi³

et al. 2018

IJET

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Expansion chamber and Helmholtz resonators are widely used in noise control. In this paper, they are combined to use as a hybrid muffler. The analysis is done to investigate the influence of the parameters of Helmholtz resonator on transmission loss. The transfer matrix method is used in the analysis. The result of transmission loss from the transfer matrix method is validated with the result from experimental two-load method using four microphones impedance tube. After had the transmission loss of the hybrid muffler been validated, the study was proceeded to investigate the effects of parameters of Helmholtz resonator on the transmission loss. The root mean square value of transmission loss were also calculated to compare the transmission losses clearly. In this paper, we investigated the effect of length of the neck of Helmholtz resonator, the effect of diameter of the neck of Helmholtz resonator, the effect of the length of the Helmholtz resonator cavity and the effect of the diameter of the Helmholtz resonator cavity for stationary medium. It is found that the transmission loss is increased when the diameter of the neck of Helmholtz resonator is increased. When the length of the neck is reduced, the transmission loss is increased. The transmission loss can also be increased by reducing the diameter of resonator cavity. It is better to increase the transmission loss at low frequencies by increasing the length of the resonator cavity.

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“…However, this method suits only one dimensional systems and the higher-order mode effects in wave propagation are neglected. The higher-order modes can significantly affect the performance of expansion chamber mufflers [7], [8] . Kirby [9] also added that, plane wave approach is inaccurate when perforated pipes of low porosity are present.…”

Section: Introductionmentioning

confidence: 99%

“…Mehdizadeh [10] stated that a multi-dimensional approach is required for the accurate prediction of acoustic attenuation performance of a muffler; and the FEM is suitable to predict the acoustic performance of reactive muffler with any given geometry. Wu et al [7] mentioned that a finite element method (FEM) has also been involved in the study fields of higher-order modes which are also based on three-dimensional acoustical analysis.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Simulation of Acoustic Attenuation Performance of Elliptical Muffler Chambers

Badya

Dhaiban

Hassanien

et al. 2011

JES. Journal of Engineering Sciences

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A three-dimensional finite element analysis has been implemented to predict the transmission loss of an elliptic expansion chamber muffler for a given frequency range. Finite element models have been established by ANSYS 12.0.1. Results obtained from the model were compared with both experimental data obtained from previous work of Gerges et al. [1] . Comparison showed an excellent agreement between modeling results and experimental data. Six muffler configurations of different major/minor axis ratios of elliptic expansion chamber (a/b), with equal chamber volume have been modeled. Results demonstrated the ability of FEM to represent the acoustic attenuation performance of acoustical muffler. It also showed the effect of (a/b) ratio on the cut-off frequency due to multidimensional modes propagation. The FEM results were interpreted in various muffler configurations to determine the relationship between the number of domes in transmission loss characteristic curve and (a/b) ratio.

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Transmission loss prediction on SIDO and DISO expansion-chamber mufflers with rectangular section by using the collocation approach

Cited by 20 publications

References 18 publications

A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design

A statistical design optimization study of a multi-chamber reactive type silencer using simplex centroid mixture design

Effects of Parameters of Helmholtz Resonator on Transmission Loss of Hybrid Muffler

Finite Element Simulation of Acoustic Attenuation Performance of Elliptical Muffler Chambers

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