Abstract
Abstract : The characteristics of phase and group velocity and propagation loss are investigated for low-order modes with phase velocities less then the maximum sound speed separating the ducts. Cross-duct and in-duct propagation are evaluated for the source and receiver in different and identical duct(s), respectively. Detailed numerical examples are presented concerning the characteristics of the band about each critical frequency displayed. The phase- integral method of ray theory provides good first-order approximations to the mode eigenvalues, the critical frequencies, and group velocity. (jhd)
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