Nonlinear acoustic propagation in rectangular ductsThe method of multiple scales is used to obtain a second-order uniformly valid expansion for nonlinear acoustic wave propagation in a rectangular duct whose walls are treated with a nonlinear acoustic material. The wave propagation in the duct is characterized by the unsteady nonlinear Euler equations. The results show that nonlinear materials attenuate sound more than linear materials except at high acoustic frequencies. The nonlinear materials produce higher and combination tones which have higher attenuation rates than the fundamentals. Moreover, the attenuation rates of the fundamentals increase with increasing amplitude.
Document ID
19740051610
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Nayfeh, A. H.
Tsai, M.-S. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1974
Subject Category
Physics, General
Meeting Information
Meeting: Symposium on Finite-amplitude wave effects in fluids