Effect of an expansion chamber on the propagation of sound in circular ducts
Elsharkawy, A. I.
Nayfeh, Ali H.
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The present analysis reveals that the performance of an expansion chamber is greatly affected by the expansion ratio, the sound frequency and to a lesser extent the chamber length. This conclusion was verified experimentally. It is shown that plane-wave theory is valid only at low sound frequencies and small expansion ratios. It is also concluded that expansion-chamber mufflers are efficient in attenuating low-frequency sound, which make them ideal for automotive silencing applications.