Simulation of automotive exhaust muffler for tail pipe noise reduction

Abstract

Automotive muffler is a component used to reduce the noise of high pressure exhaust gases that are produced from the internal combustion engine. The main objective of this study is to analyse the effect of the muffler parameter to the sound pressure level (SPL) at the tail pipe noise using GT-Power simulation software. The muffler runs with a Proton Iriz engine model at engine speed from 1000 RPM to 6000 RPM at full load condition. The parameter of each muffler model was compared to determine the most suitable model to reduce the noise at tail pipe with lower backpressure difference. The results obtained were compared with those from previous research as a mean of benchmarking. The muffler model should not produce a backpressure difference of more than 5% from the benchmark systems. It is found that the most suitable model in reducing the tail pipe noises is Model B, which manage to reduce the noise by 3.07% (average) of the sound pressure level with backpressure difference of 0.35% only by only reducing the perforates number and shorten the perforates length.