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There are two noises emitted by mufflers: Tail pipe noise and shell noise. Several design methods are available for tailpipe noise reduction however limited work is done on muffler shell noise reduction and quantification. In case of higher capacity engines, larger mufflers and HVAC ducts, the shell noise becomes significant contributor in total noise which may also affect pass by legislation requirements. The objective of this paper is to develop methodology to evaluate muffler shell noise and to identify the parameters influencing it.Total muffler emitted noise is quantified terms of transmission loss, it is function of axial and transverse Transmission Loss(TL).Transverse TL is evaluation parameter of shell noise. During the test input sound power is measured making use of two microphone technique. To calculate shell radiated noise the sound power of the muffler is evaluated using Sound Intensity method in hemi anechoic chamber. Difference in incident and radiated power gives Transverse TL.Further influence of various parameters like muffler geometry, shell thickness and end plate thickness are evaluated in the test. The geometry shape and shell thickness are found to be the most influencing parameters. Lastly guidelines for shell noise reduction are formulated.
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