An Investigation of Acoustic Attenuation Performance of Silencers with Mean Flow Based on Three-Dimensional Numerical Simulation

Fan, Wei; Guo, Li‐Xin

doi:10.1155/2016/6797593

Cited by 13 publications

(6 citation statements)

References 26 publications

(41 reference statements)

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“…In previous studies [22][23][24], most of the research studies on the transmission loss characteristics of mufflers used simulation and experimental methods (references are cited here). Some phenomena can be found, but the internal mechanism is difficult to reveal accurately.…”

Section: Influence Of the Outlet Position On The Transmission Loss Of The Mufflermentioning

confidence: 99%

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

Zhang

Shi

Zeng

et al. 2020

Shock and Vibration

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Vibration and noise reduction methods are important research directions in many industries. Mufflers are widely used in pipelines to reduce noise and vibration transmission. A theoretical analysis is conducted to determine the noise reduction mechanism of a muffler with a side outlet, and the results are verified with experiments. The quadrupole parameters of the muffler are obtained using transfer matrix analysis, and sensitivity analysis of the quadrupole parameters is conducted. The influence of the side outlet location on the transmission loss of the muffler is investigated experimentally using an impedance tube. The key factors affecting the transmission loss are analyzed. The theoretical calculation results of the transmission loss of the side outlet muffler are in good agreement with the experimental results.

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Section: Influence Of the Outlet Position On The Transmission Loss Of The Mufflermentioning

confidence: 99%

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

Zhang

Shi

Zeng

et al. 2020

Shock and Vibration

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“…Patne et al studied in [16] the TL of a reactive muffler using COMSOL software, employing FEM. Fan and Guo [17] investigated the TL of a silencer using 3D-FEM coupled with CFD. Puthuparampil, in his master's thesis [18], studied the acoustic optimization of mufflers using single-objective and multi-objective optimization based on TMM and FEM.…”

Section: Introductionmentioning

confidence: 99%

Recent Developments in Using a Modified Transfer Matrix Method for an Automotive Exhaust Muffler Design Based on Computation Fluid Dynamics in 3D

Bugaru,

Vasile

2024

Computation

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The present work aims to investigate the newly modified transfer matrix method (MTMM) to predict an automotive exhaust muffler’s transmission loss (AEMTL). The MTMM is a mixed method between a 3D-CFD (Computation Fluid Dynamics in 3D), namely AVL FIRETM M Engine (process-safe 3D-CFD Simulations of Internal Combustions Engines), and the classic TMM for the exhaust muffler. For all the continuous and discontinuous sections of the exhaust muffler, the Mach number of the cross-section, the temperature, and the type of discontinuity of the exhaust gas flow were taken into consideration to evaluate the specific elements of the acoustic quadrupole that define the MTMM coupled with AVL FIRETM M Engine for one given muffler exhaust. Also, the perforations of intermediary ducts were considered in the new MTMM (AVL FIRETM M Engine linked with TMM) to predict the TL (transmission loss) of an automotive exhaust muffler with three expansion chambers. The results obtained for the TL in the frequency range 0.1-4 kHz agree with the experimental results published in the literature. The TMM was improved by adding the AVL FIRETM M Engine as a valuable tool in designing the automotive exhaust muffler (AEM).

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“…In recent years, experimental and FEM studies have been used to develop efficient muffler acoustic models especially for the application of absorptive materials in noise level reduction. 17–20 For example, Munt 21 performed a transfer matrix modeling of a cylindrical exhaust muffler consisting of membrane and hard porous media to study sound propagation at low frequencies (between 63 and 500 Hz). Lee 22 investigated the acoustic performance of the exhaust at frequencies below 3000 Hz using FEM.…”

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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An Investigation of Acoustic Attenuation Performance of Silencers with Mean Flow Based on Three-Dimensional Numerical Simulation

Cited by 13 publications

References 26 publications

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

Theoretical and Experimental Study on the Transmission Loss of a Side Outlet Muffler

Recent Developments in Using a Modified Transfer Matrix Method for an Automotive Exhaust Muffler Design Based on Computation Fluid Dynamics in 3D

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

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