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Simulation and Measurements of Insertion Loss of Passive Silencers

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Abstract:

The insertion loss of passive silencers is studied by means of a numerical simulation tool for coupled field problems. This simulation scheme is based on the Finite-Element-Method (FEM) and allows, besides other physical couplings, the precise and efficient calculation of mechanical and acoustic fields including their mutual couplings. Therewith, the interaction of the acoustic wave with the passive silencer can be studied and optimisation with respect to geometrical configuration and material parameters can be performed.

In this paper, the validity of the simulation models is first studied and verified by comparing measurements and simulations of the absorption coefficient of the passive silencer material. Next, the insertion loss of passive silencers is calculated for several configurations and also compared with measurements. For all test cases good agreement is observed. As an application, we investigate the problem of standing waves arising in measurement setups according to ISO regulations.

Document Type: Research Article

Publication date: March 1, 2002

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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