Exhaust and Intake Noise and Acoustical Design of Mufflers

A muffler or silencer is a device used in a flow duct to prevent sound from reaching the openings of the duct and radiating as far-field sound. Reactive silencers do this by reflecting sound back towards the source while absorptive silencers attenuate sound using absorbing material. They are necessa...

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Bibliographic Details
Published inHandbook of Noise and Vibration Control p. 1034
Main Authors Glav, Ragnar, Bodén, Hans
Format Book Chapter
LanguageEnglish
Published 2008
Subjects
Online AccessGet full text
ISBN0471395994
9780471395997
DOI10.1002/9780470209707.ch85

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Summary:A muffler or silencer is a device used in a flow duct to prevent sound from reaching the openings of the duct and radiating as far-field sound. Reactive silencers do this by reflecting sound back towards the source while absorptive silencers attenuate sound using absorbing material. They are necessary components in the design of any exhaust or intake system for internal combustion (IC) engines. No car or truck can pass the standard noise tests required by legislation or compete on the market without them. There are three basic requirements for a modern exhaust systems; compact outer geometry, sufficient attenuation and low pressure drop.   The aim of this chapter is to discuss acoustical design and analysis of IC-engine exhaust and intake systems. The specific problems of modern intake systems made from plastic material with non-rigid walls are not discussed because not much has been published on this subject. The theory and techniques presented can be used also for other applications such as compressors and pumps and to some extent also for air-conditioning and ventilation systems.
ISBN:0471395994
9780471395997
DOI:10.1002/9780470209707.ch85