Optimal partition layout of expansion chamber muffler with offset inlet/outlet

Jang, Gang-Won; Lee, Jin Woo

doi:10.1007/s12239-015-0090-6

Cited by 14 publications

(3 citation statements)

References 24 publications

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“…In order to achieve the purpose of noise reduction, the optimized partition layout of the bias inlet/outlet muffler is systematically designed. The method is verified by experiments [32]. Lee [33] optimized the muffler through the topology optimization method and set a rigid baffle inside the muffler to improve the muffler's performance within the target frequency range and carried out experimental verification.…”

Section: Introductionmentioning

confidence: 94%

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

et al. 2022

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The exhaust tailpipe of a certain type of tractor was improved from the perspective of bionics, and bionic triangular convex texture was added to the inner surface of the exhaust tailpipe. The bionic tailpipe was proposed to improve noise reduction performance without changing the overall size parameters of the prototype tailpipe. Acoustics simulation software was used to predict the aeroacoustics noise and transmission loss of the exhaust tailpipe. Bionic exhaust tailpipes with triangular textures of different numbers of circumferential columns, height, and top angles were analyzed to study the noise reduction performance. The results showed that the proposed bionic exhaust tailpipes with triangular convex textures reduced the total sound pressure level and improved the transmission loss of the prototype exhaust tailpipe. To increase the transmission loss, a genetic algorithms (GA) optimized back-propagation neural network (BP) was used to optimize the bionic triangular convex texture parameters. By studying the aerodynamic noise reduction mechanism of bionic tailpipes, the research suggested that a secondary vortex appeared near the bionic texture and reduced aerodynamic drag and aeroacoustics noise. In addition, the sound pressure level amplitude nephogram, velocity vector nephogram, and velocity amplitude nephogram of the exhaust tailpipes were analyzed to study the vibration noise reduction mechanism of the bionic tailpipes. Then, the noise reduction performance was experimentally evaluated. The experimental results of the bionics exhaust tailpipes with triangular convex textures were analyzed and compared to that of the prototype tailpipe. The results demonstrated that the bionic exhaust tailpipes were able to attenuate noise.

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Section: Introductionmentioning

confidence: 94%

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

et al. 2022

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“…Renato Barbieri et al studied the numerical calculation of muffler transmission losses by using acoustic/passive finite element analysis of the acoustic chamber and GA (Genetic Algorithm) optimization with integer variables [8]. Jang and Lee optimized the import and export of expansion mufflers by applying acoustic and flow topology optimization methods [9].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Improved Vehicle Muffler

Wang

Gao²,

Bu³

2018

mech

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“…Furthermore, the exhaust system can be employed to reduce engine noise [1]. Numerous studies on the acoustical and flow characteristics of the chamber muffler have been conducted [2,3,4]. However, minimal research has been conducted on the perforation porosities of pipe in the chamber.…”

mentioning

confidence: 99%

Optimization of Backpressure in Exhaust Muffler for Automobile

Hamid,

Rosman,

Muslim

2021

JAMEA

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The goal of this study is to optimise the exhaust middle box muffler of an automobile by focusing on the design of the perforated pipes. Back pressure and pressure drop in the exhaust are two characteristics that contribute to the various effects of an internal combustion engine. In this study, the pressure distribution of an existing exhaust middle box muffler on the perforated pipe is evaluated using Computational Fluid Dynamic (CFD) software, and the suitable perforated pipe is identified to improve the middle box muffler performance. The simulation of fluid flow inside a passage of perforated pipe with the same diameter and length but different perforation diameters and distance between perforations was carried out in this study. The CFD analysis simulation results showed the flow pattern with pressure contours for each sample. The results also revealed that each sample had a different pressure drop. An optimised design of perforations inside the middle box muffler pipe results in less pressure drop, which improves exhaust system performance. The simulation results are plotted and a comparison of various perforation diameter and distance can be seen. Larger distance between perforations at 20 mm gives large discrepancies in the results which is 15% difference of pressure drop as compared to smaller distance between perforations that gives less than 1% difference of pressure drop for 6mm and 7mm diameter of perforated pipes. The results also shows that 5mm of perforation diameter gives even larger pressure drop as high as 44.66%.

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Optimal partition layout of expansion chamber muffler with offset inlet/outlet

Cited by 14 publications

References 24 publications

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

Structural Design and Parameter Optimization of Bionic Exhaust Tailpipe of Tractors

Performance Analysis of Improved Vehicle Muffler

Optimization of Backpressure in Exhaust Muffler for Automobile

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