期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2016
卷号：5
期号：2
页码：1366
DOI：10.15680/IJIRSET.2016.0502027
出版社：S&S Publications
摘要：Main drawback of I.C. engines working is that it is a major source of noise pollution. That is why thereduction of exhaust noise generated from engine is in today's world an important issue. Attaching a muffler in theexhaust pipe is the good option for reducing noise. But muffler requires specific design and construction consideringvarious noise parameters produced by the engine. Since early development of mufflers, the main objective of designwas attenuation of sound in regular mufflers. Which causes a great amount of back pressure at the exhaust port thuslosing power, increasing fuel consumption and piston effort to exhale the gases out. For high performance engines thefree flow exhaust is made in which the sound level is not important but zero or less back pressure is. There is nointermediate muffler type in between both these, so semi active muffler is an step between these two, in which itattenuates sound when engine is running at low rpm , and converts in free flow when engine at higher revs.
关键词：CFR-cylinder firing ratio; EFR-engine firing ratio; Semi active muffler; Vm-volume of muffler
