A boundary element analysis of a concentric-tube resonator

Wang, Chao‐Nan; Tse, Chuan-Cheung; Chen, Yih‐Nan

doi:10.1016/0955-7997(93)90065-s

Cited by 17 publications

(2 citation statements)

References 9 publications

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“…The multi-domain BEM is also used to deal with problems with several acoustic media in Utsuno et al (1990). Another common application is the problem about thin bodies considered by Cheng et al (1991); Wang et al (1993) before using the hypersingular integral equation.…”

Section: Introductionmentioning

confidence: 99%

Horn effect of tyre/road noise: modelling and experiments of acoustic network resonators in horn-like structures

Wang

Duhamel

2018

IJVNV

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The noise generated in the contact zone can be amplified by the horns made by the surfaces of the tire and the road. Previous researches on the horn effect have only investigated smooth tires and roads. In this work we take into account the tire treads in the calculation of the horn effect. The air resonances and horn effects are studied in the same model. A model of flanged networks is established for the tire/road system, and multi-domain coupling methods are developed for the calculation of the acoustic fields around the flanged networks. With this model the reductions of the amplifications of the horn effect by the networks can be estimated. The model of the flanged networks are also proved to be effective by the experiments. Wooden pipes between a wooden cylinder and a sheet of plywood are built for the validation. A real tire on a sheet of plywood is also measured and calculated with the proposed methods.

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Section: Introductionmentioning

confidence: 99%

Horn effect of tyre/road noise: modelling and experiments of acoustic network resonators in horn-like structures

Wang

Duhamel

2018

IJVNV

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“…With the component assembly capability of the direct mixed-body BEM, there is no need to do the tedious multidomain zoning and interface matching as required by the conventional multi-domain BEM. 3,4 For packed silencers, the BEM modeling becomes even more challenging because there are at least two different acoustic media involved, air and the bulk-reacting sound absorbing material. A bulk-reacting sound absorbing material is characterized by a complex speed of sound and a complex mean density.…”

Section: Introductionmentioning

confidence: 99%

A direct mixed-body boundary element method for packed silencers

Cheng

Zhang

2002

The Journal of the Acoustical Society of America

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Bulk-reacting sound absorbing materials are often used in packed silencers to reduce broadband noise. A bulk-reacting material is characterized by a complex mean density and a complex speed of sound. These two material properties can be measured by the two-cavity method or calculated by empirical formulas. Modeling the entire silencer domain with a bulk-reacting lining will involve two different acoustic media, air and the bulk-reacting material. Traditionally, the interior silencer domain is divided into different zones and a multi-domain boundary element method (BEM) may be applied to solve the problem. However, defining different zones and matching the elements along each interface is tedious, especially when the zones are intricately connected. In this paper, a direct mixed-body boundary element method is used to model a packed silencer without subdividing it into different zones. This is achieved by summing up all the integral equations in different zones and then adding the hypersingular integral equations at interfaces. Several test cases, including a packed expansion chamber with and without an absorbing center bullet, and a parallel baffle silencer, are studied. Numerical results for the prediction of transmission loss (TL) are compared to experimental data.

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Mufflers and Silencers – Absorbent and Reactive Types

2020

Engineering Acoustics

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A boundary element analysis of a concentric-tube resonator

Cited by 17 publications

References 9 publications

Horn effect of tyre/road noise: modelling and experiments of acoustic network resonators in horn-like structures

Horn effect of tyre/road noise: modelling and experiments of acoustic network resonators in horn-like structures

A direct mixed-body boundary element method for packed silencers

Mufflers and Silencers – Absorbent and Reactive Types

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