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Sound propagation over uneven ground and irregular topography (Document No: 19870002142)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pierce, A. D. Main, G. L. Kearns, J. A. |
| Copyright Year | 1986 |
| Description | Theoretical, computational, and experimental techniques for predicting the effects of irregular topography on long range sound propagation in the atmosphere was developed. Irregular topography here is understood to imply a ground surface that is not idealized as being perfectly flat or that is not idealized as having a constant specific acoustic impedance. The interest focuses 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 | 783910 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870002142 |
| Archival Resource Key | ark:/13960/t8vb31g8w |
| Language | English |
| Publisher Date | 1986-10-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Fourier Transformation Sound Propagation Topography Grazing Incidence Spectrum Analysis Atmospheric Attenuation Surface Roughness Computer Programs Sound Pressure 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 |
