Abstract
Noise attenuation characteristics of a simple expansion chamber with a side inlet and an end outlet are studied. A theoretical method is derived to investigate the influences caused by higher-order modes, using a three-dimensional analysis in which the chamber is considered as a piston-driven circular cylinder. Also, quantitative estimation for the transmission loss can be performed, using the derived four-pole parameters. Accordingly, the characteristics of the chamber, as a result of the interactions between the plane wave and the transverse waves, can be investigated easily with respect to the relative locations of the inlet/outlet and chamber length. Experiments are performed for the verification of the theory. In the case of the chamber with a concentric end outlet, plane-wave theory agrees with the theoretical and experimental results below the rather high frequency range, but not for the case of the chamber with an offset end outlet. Experimental results are in good agreement with the theoretical results obtained.
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