Development and testing of micro slit panel mufflers

Points out the functional and structural defects of a micro perforated panel muffler and presents the sound absorption mechanism and the calculation of the sound absorption coefficient of the micro slit panel. Develops a new type of micro slit muffler by analogy-based design method with referring to the structure parameters of the micro perforated panel muffler. A comparison of test results shows that the micro slit panel muffler has better performance in sound attenuation and a much smaller size than the micro perforated panel muffler. Therefore it can be applied and promoted in engineering projects as a substitute of the micro perforated panel muffler.