Transmission Loss Characteristics of Expansion : Chamber Silencers with Tapered Connectors

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This paper describes the transmission loss characteristics and acoustical overall performance of expansion-chamber silencers with tapered connectors at either end or both ends of the chambers which are widly used in ventilation systems. The transmission-loss equations for these silencers were derived by using plane wave and conical horn theory. The calculated results agreed fairly well with those of the experiments made at room temperature and without a flow. The values of the transmission-loss shift toward the lower frequency and diminish as the length of the tapered connectors is increased, but its maximum values in the low frequency range are similar to those of the ordinary type of expansion-chamber silencers.
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