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Higher order mode propagation in nonuniform circular ducts
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Cho, Y. C. Ingard, K. U. |
| Copyright Year | 1980 |
| Description | Higher order mode propagation in a nonuniform circular duct without mean flow was investigated. An approximate wave equation is derived on the assumptions that the duct cross section varies slowly and that mode conversion is negligible. Exact closed form solutions are obtained for a particular class of converging-diverging circular duct which referred to as 'circular cosh duct.' Numerical results are presented in terms of the transmission loss for the various duct shapes and frequencies. The results are applicable to multimodal propagation, single mode propagation, and sound radiation from certain types of contoured inlet ducts, or of sound propagation in a converging-diverging duct of somewhat different shape from a cosh duct. |
| File Size | 737828 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19800014612 |
| Archival Resource Key | ark:/13960/t6vx55j0n |
| Language | English |
| Publisher Date | 1980-01-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Numerical Analysis Ducts Acoustic Attenuation Acoustic Propagation Wave Equations Propagation Modes Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
