Adding Bypass Ducts to Enhance Muffler Performance without Increasing Size

Zhang, Y.; Herrin, D. W.; Wu, Tao

doi:10.4271/2013-01-1882

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…Some researches demonstrated that the HQ tube could increase the transmission loss of mufflers and noise attenuators at selected frequencies. Zhang et al reported that the optimal length and cross-sectional area could be determined using the Vincent Circle as an optimization technique [6]. They stated that the attenuation at low frequencies could improve by as much as 15 dB.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown by Zhang et al that the length and cross-sectional area of the bypass duct could be optimized using a complex transformation called the Moebius transformation if the bypass duct is short. Accordingly, the complex plane can be used to find an optimal solution that provides the highest transmission loss [6]. Wang et al developed A twodimensional theoretical model to suppress sound radiation from an axial-flow fan [8].…”

Section: Introductionmentioning

confidence: 99%

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Analytical and numerical modeling, sensitivity analysis, and multi-objective optimization of the acoustic performance of the herschel-quincke tube

et al. 2021

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analytical and numerical modeling, sensitivity analysis, and multi-objective optimization of the acoustic performance of the herschel-quincke tube

et al. 2021

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Acoustic analysis of a flute-like silence

Zhao

Tan

2021

Journal of Sound and Vibration

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Assessing the Effects of Impedance Modifications Using the Moebius Transformation

Zhang

Herrin

2015

Journal of Vibration and Acoustics

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The Moebius transformation maps straight lines or circles in one complex domain into straight lines or circles in another. It has been observed that the equations relating acoustic or mechanical impedance modifications to responses under harmonic excitation are in the form of the Moebius transformation. Using the properties of the Moebius transformation, the impedance modification that will minimize the response at a particular frequency can be predicted provided that the modification is between two positions. To prove the utility of this method for acoustic and mechanical systems, it is demonstrated that the equations for calculation of transmission and insertion loss of mufflers, insertion loss of enclosures, and insertion loss of mounts are in the form of the Moebius transformation for impedance modifications. The method is demonstrated for enclosure insertion loss by adding a short duct in a partition introduced to an enclosure. In a similar manner, it is shown that the length or area of a bypass duct in a muffler can be tuned to maximize the transmission loss. In the final example, the insertion loss of an isolator system is improved at a particular frequency by adding mass to one side of the isolator.

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Adding Bypass Ducts to Enhance Muffler Performance without Increasing Size

Cited by 6 publications

References 6 publications

Analytical and numerical modeling, sensitivity analysis, and multi-objective optimization of the acoustic performance of the herschel-quincke tube

Analytical and numerical modeling, sensitivity analysis, and multi-objective optimization of the acoustic performance of the herschel-quincke tube

Acoustic analysis of a flute-like silence

Assessing the Effects of Impedance Modifications Using the Moebius Transformation

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