Development and Validation of Sound Transmission Loss Measurement System for Measuring Muffler Performance

Muffler is a part of the vehicle exhaust system that absorb or reflect sound waves to reduce exhaust noise. One of the most important determinants of a muffler performance is the amount of attenuation that has on its input wave; this parameter is known as sound transmission loss. Four - mic standard test is one way to determine this parameter which is used in this paper. In this study, a test device was developed to measure the level of Sound Transmission Loss. In order to validate the performance of the test apparatus and its results, sound transmission loss is calculated for real sample using GT-Power software and theoretical calculations. The sound transmission loss test machine can be used to assess mufflers used in the car and other industries. In general, the main purpose of this research is to construct the sound transmission loss test device and develop the computational code for it and validate the performance of the test system.