Virginia Tech. Engineering Science and Mechanics DepartmentElsharkawy, A. I.Nayfeh, Ali H.2015-05-282015-05-281978-03-01Elsharkawy, A. I., & Nayfeh, A. H. (1978). Effect of an Expansion Chamber on Propagation of Sound in Circular Ducts. Journal of the Acoustical Society of America, 63(3), 667-674. doi: 10.1121/1.3817920001-4966http://hdl.handle.net/10919/52714The 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.8 pagesapplication/pdfen-USIn CopyrightAcoustical effectsSound propagationEffect of an expansion chamber on the propagation of sound in circular ductsArticle - Refereedhttp://scitation.aip.org/content/asa/journal/jasa/63/3/10.1121/1.381792Journal of the Acoustical Society of Americahttps://doi.org/10.1121/1.381792