Abstract
We studied acoustical properties of a single dust expansion in an infinite circular duct. As is generally known, in the case of long duct expansion, its properties depend on interference of sound waves propagating in the axial direction, but in the case of sufficiently short duct expansion, it behaves as a resonator muffler. In this study, we considered duct expansions with short axial length in between the above two cases, and indicated the change of properties of such duct expansion according to its length by experiment and numerical calculation. The incident waves were the plane wave and the (1, 1) mode wave. The calculated results were in good agreement with the measured results. Hence the applicability of the calculation method in this study was confirmed. Form the results of this study it is shown that such duct expansion behaves as a sound attenuator which is effective in a wide frequency range.
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