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Sound propagation over uneven ground and irregular topography
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Pierce, Allan D. Main, Geoffrey L. Kearns, James A. Berthelot, Yves H. |
| Copyright Year | 1987 |
| Description | The goal of this research is to develop theoretical, computational, and experimental techniques for predicting the effects of irregular topography on long range sound propagation in the atmosphere. Irregular topography here is understood to imply a ground surface that is not idealizable as being perfectly flat or that is not idealizable as having a constant specific acoustic impedance. The interest of this study focuses on circumstances where the propagation is similar to what might be expected for noise from low-attitude air vehicles flying over suburban or rural terrain, such that rays from the source arrive at angles close to grazing incidence. The activities and developments that have resulted during the period, August 1986 through February 1987, are discussed. |
| File Size | 1646954 |
| Page Count | 41 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870018047 |
| Archival Resource Key | ark:/13960/t75t8hx8r |
| Language | English |
| Publisher Date | 1987-02-01 |
| Access Restriction | Open |
| Subject Keyword | Acoustics Fourier Transformation Sound Propagation Topography Pressure Distribution Signal Processing Surface Roughness Prediction Analysis Techniques Microphones 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 |
