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Sound propagation over uneven ground and irregular topography (Document No: 19870018049)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chen, Pei-Tai Zhou, Ji-Xun Pierce, Allan D. Chisholm, Nathaniel Main, Geoffrey L. Kearns, James A. Berthelot, Yves H. |
| Copyright Year | 1987 |
| Description | The acoustic impedance of the surface coverings used in the laboratory experiments on sound diffraction by topographical ridges was determined. The model, which was developed, takes into account full wave effects and the possibility of surface waves and predicts the sound pressure level at the receiver location relative to what would be expected if the flat surface were not present. The sound pressure level can be regarded as a function of frequency, sound speed in air, heights of source and receiver, and horizontal distance from source to receiver, as well as the real and imaginary parts of the surface impedance. |
| File Size | 292666 |
| Page Count | 9 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870018049 |
| Archival Resource Key | ark:/13960/t9w13zg4m |
| Language | English |
| Publisher Date | 1987-07-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Sound Waves Fourier Transformation Wave Propagation Algorithms Topography Mathematical Models Surface Roughness Impedance Sound Pressure 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 |
