Abstract
Theoretical equations which give attenuation characteristics are presented for many types of mufflers, which are chosen single and multiple chamber mufflers of the expansion chamber, resonators and their modified types, because these mufflers are foundamental components making up practical mufflers and have less flow resistance. Pure sound experiments have been made to investigate attenuation characteristics for these mufflers and to examine applicability of the theories. Results of the pure sound experiments indicate good agreement with these theories. Two disadvantageous characterisitics of the ordinary expansion chamber, which are the periodical pass-frequencies and larger flow resistance than other mufflers, are eliminated by development of an advanced type. The approximate equation, which represents tail pipe effect and is independent of the equations for mufflers themselves, indicates good agreement with the results of the pure sound experiment.
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