Abstract
The noise nuisance caused by cars has recently attracted the mention of many peoples as one of the social problems arising alone with a sudden increase of car traffics in cities. To reduce the noises, “reactance mufflers” in which the acoustic energy is reserved, are the most useful to internal combustion engines because of a good durability on heats and contaminations by combustion. Until now, various kinds of “reactance mufflers” have been designed, but it is unfortunate that these methods seem to be ineffective in the systematic design.
In this study, an expansion chamber muffler, one of the simplest reactance mufflers, is systematically designed by using the fluid network theory which we have already presented.
The advantages of this design method are as follows;
1) The calculation is relatively easy.
2) The effects of the internal resistance of engine and the outlet load resistance of muffler can be considered.
3) The attenuation poles can be made at desirable frequencies.
