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Sound propagation over uneven ground and irregular topography (Document No: 19880017527)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Zhou, Ji-Xun Pierce, Allan D. Kearns, James A. Berthelot, Yves H. |
| Copyright Year | 1988 |
| Description | Theoretical, computational, and experimental techniques were developed for predicting the effects of irregular topography on long range sound propagation in the atmosphere. Irregular topography is understood to imply a ground surface that: (1) is not idealizable as being perfectly flat, or (2) that is not idealizable as having a constant specific acoustic impedance. The focus is on circumstances where the propagation is similar to what might be expected for noise from low altitude air vehicles flying over suburban or rural terrain, such that rays from the source arrive at angles close to grazing incidence. |
| File Size | 1051217 |
| Page Count | 56 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19880017527 |
| Archival Resource Key | ark:/13960/t0wq4vp5b |
| Language | English |
| Publisher Date | 1988-08-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Noise Propagation Wave Diffraction Diffraction Paths Terrain Aircraft Noise Grazing Incidence Acoustic Propagation Surface Properties Acoustic Impedance Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
