Sub-chamber optimization for silencer design

Yu, Xiang; Tong, Yuhui; Li, Cheng

doi:10.1016/j.jsv.2015.04.022

Cited by 34 publications

(14 citation statements)

References 26 publications

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“…The overall TL may be slightly lower than the sub-chamber TLs below 180 Hz because of their strong mutual coupling in the low frequency range, as explained in Ref. 8. This numerical analysis correlates with the measured noise spectrum at 10 m away from the truck, facing directly to the muffler outlet, as shown in Fig.…”

Section: Analysis On the Existing Mufflersupporting

confidence: 83%

“…Certainly, more rigorous optimization can be carried out by prescribing the objective function and selecting an optimization algorithm. An example has been demonstrated in our previous theoretical studies 8 . In Fig.…”

Section: Retrofitted Muffler Designmentioning

confidence: 67%

“…Recently, a sub-chamber method for silencer design was proposed 8 , which theoretically pointed out that a broadband TL design can be achieved by cascading a number of sub-chambers, each with optimized TL for different frequency regions. The fact that the previous study was only verified numerically gives us the motivation of the present paper, that is, to demonstrate the effectiveness of the proposed method through a real-life case study on a retrofitted truck muffler.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the retrofitted design of a truck muffler with cascaded sub-chambers

Yu¹,

Tong²,

Pan³

et al. 2016

noise cont engng j

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Mufflers are widely used in engine exhaust systems for providing sound attenuation in a specific frequency range. In this case study, an engineering problem on reducing the noise radiation from a truck is investigated. The original muffler used by the truck consists of four reactive sub-chambers with similar geometries. Both experiments and numerical simulations revealed the narrow band transmission loss (TL) characteristics of the muffler which limit its attenuation performance, resulting in noise leakage at some particular frequencies. With an aim to broadening the attenuation bandwidth, a recently proposed sub-chamber design method is implemented to retrofit the muffler. The inner structure of the muffler is modified under the guidance of numerical simulations, in order to create extra acoustic stop-bands for an overall broadband performance. The retrofitted muffler is experimentally verified with a better TL response in the design frequency of interest. Analyses demonstrate the effectiveness of using the proposed simulationbased design method, which also show potentials to a wide range of muffler design applications. © 2016 Institute of Noise Control Engineering.

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Section: Analysis On the Existing Mufflersupporting

confidence: 83%

Section: Retrofitted Muffler Designmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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On the retrofitted design of a truck muffler with cascaded sub-chambers

Yu¹,

Tong²,

Pan³

et al. 2016

noise cont engng j

Self Cite

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show abstract

“…In addition to finding the optimal geometries of a single-layer silencer, the optimized layers can be further cascaded into a multi-layer silencer for improved acoustic performance, similar to the sub-chamber optimization technique [38]. The great extensibility of the modular origami makes it possible to employ a modularization concept to program the constituent layers to meet specific sound attenuation requirements.…”

Section: Programmability Based On Combined Effect Of Cascading Multipmentioning

confidence: 99%

Reconfigurable origami silencers for tunable and programmable sound attenuation

Fang

2018

Smart Mater. Struct.

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Recent research has discovered that origami-inspired structures possess great versatility in properties and functionalities. In this research, through an integration of origami geometry and duct acoustics, we reveal that the folding-induced shape reconfiguration of a modular origami silencer could yield great tunability and programmability in sound attenuation. This has been made possible through exploring the kinematics of the folding and the extensibility of the modular origami. Numerical and experimental results indicate that by reconfiguring the silencer via a single degree-of-freedom folding mechanism, the sound attenuation bandwidth can be effectively tuned. Meanwhile, based on a comprehensive understanding on the correlations between the origami geometries and the acoustic characteristics, we exemplify that, by incorporating multiple origami layers in a silencer and by programming their geometries, ondemand sound control can be achieved, e.g., attenuation in the prescribed frequency bands, improved attenuation levels, and broadband attenuations. This proof-of-concept study shows that the proposed folding-based mechanism, along with the modularization design concept, would provide a new way to reconfigure the silencer for acoustic adaptability and inspire new innovation in designing acoustic devices.

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“…al. [9][10][11][12] presented a theoretical description of the overall TL for cascade-connected multiple sub-chambers to achieved desired attenuation performance. V. Ovidiu [10] considered two special cases of reactive silencer investigated acoustic performance using numerical and experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

Effect of Change in Diameter on Muffler Transmission loss using COMSOL

Bhadke¹

2017

IOSR JMCE

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Sub-chamber optimization for silencer design

Cited by 34 publications

References 26 publications

On the retrofitted design of a truck muffler with cascaded sub-chambers

On the retrofitted design of a truck muffler with cascaded sub-chambers

Reconfigurable origami silencers for tunable and programmable sound attenuation

Effect of Change in Diameter on Muffler Transmission loss using COMSOL

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