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Analysis and design of a semi-active muffler
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this work, a flow reversal resonator fitted with a short-circuit duct connecting the inlet and outlet is analysed and used as a tuneable muffler element, aimed to be used use in a semi-active muffler on an IC-engine. The work done can be divided into 3 main parts. 1), a study of what type of valve that could be used to change the acoustical properties of the short-circuit duct. 2), Design of a flow reversal resonator with a controllable valve as the short-circuit. 3), experimental validation in a flow acoustic test rig. The flow reversal resonator with a controllable valve as short-circuit is successfully validated to work as tuneable muffler element during laboratory conditions. The same valve concept is simulated in a full scale concept but not validated experimentally on a running IC-engine. The theory used to describe the acoustics of a flow duct element is also presented together with three simulation techniques and the two microphone technique used to determine the acoustic properties of the investigated flow reversal resonator.

Place, publisher, year, edition, pages
2012. , 35 p.
Trita-AVE, ISSN 1651-7660 ; 2012: 05
National Category
Fluid Mechanics and Acoustics
URN: urn:nbn:se:kth:diva-91340OAI: diva2:509618
Subject / course
Technical Acoustics
Educational program
Master of Science in Engineering - Vehicle Engineering
Available from: 2012-03-15 Created: 2012-03-13 Last updated: 2012-03-15Bibliographically approved

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Marcus Wallenberg Laboratory MWL
Fluid Mechanics and Acoustics

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