Impedance Matrix Synthesis for Multiply Connected Exhaust Network Systems Using the Direct Mixed-Body Bem

Lou, Guangyuan; Wu, Tao; Cheng, C.Y.R.

doi:10.1006/jsvi.2000.3012

Cited by 10 publications

(1 citation statement)

References 12 publications

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“…These include the conventional four-pole transfer matrix method, 3,4 the three-point method, 1,11 the improved four-pole method, 2 and the impedance matrix method. 12 The method used in this paper is the impedance matrix method.…”

Section: Complete Integral Equationsmentioning

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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Section: Complete Integral Equationsmentioning

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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Transmission loss estimation of splitter silencer using multi-domain BEM

Lee

Park

2007

J Mech Sci Technol

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This paper suggests a practical method, based on multi-domain BEM, to calculate the transmission loss of 3-dimensional silencers of subdomains comprised of different geometric and material characteristics with looped and/or cascaded connections. We previously proposed an efficient method to compute the transmission loss for 3-dimensional silencers using multi-domain BEM but its application is much difficult to those having looped subdomains [l]. Here, we adopt a method summing the impedance matrices of the subdomains with various types of connection represented by system graph. The algebraic overall condensed acoustic equations having only particle velocities on the subdomain interface boundaries as unknowns are formulated. A splitter silencer of cascaded, looped and symmetric connections as a sample problem is dealt with for the explanation and verificationof the proposed method. An experimental work with the splitter silencer is performed to back lip the suggested method.

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Acoustic attenuation analysis of network systems by using impedance matrix method

Yang

2016

Applied Acoustics

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Impedance Matrix Synthesis for Multiply Connected Exhaust Network Systems Using the Direct Mixed-Body Bem

Cited by 10 publications

References 12 publications

A direct mixed-body boundary element method for packed silencers

A direct mixed-body boundary element method for packed silencers

Transmission loss estimation of splitter silencer using multi-domain BEM

Acoustic attenuation analysis of network systems by using impedance matrix method

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