| Title | Spectral characteristics of wake vortex sound during roll-up |
|---|---|
| Record ID | 46048 |
| Personal Name Creator |
Zhang, Yan; Wang, Frank Y.; Hardin, J. C. |
| Source | 30p. in various pagings |
| Corporate Creator | Langley Research Center; John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. National Aeronautics and Space Administration |
| Publication Date | 20031201 |
| Language | English |
| Abstract | This report presents an analysis of the sound spectra generated by a trailing aircraft vortex during its rolling-up process. The study demonstrates that a rolling-up vortex could produce low frequency (less than 100 Hz) sound with very high intensity (60 dB above threshold of human hearing) at a distance of 200 feet from the vortex core. The spectrum then drops off rapidly thereafter. The study suggests that acoustic sensors operating at low frequency band could be profitably deployed for detecting the vortex sound during the rolling-up process. |
| Rosap ID | dot:9667 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9667 |
| TRT Terms | Vortices; Aircraft; Acoustic emission; Sensors; Fourier transforms; Wakes; Spectrum analysis |
| General Subjects | Vortex sound; Aircraft wake; Vortex noise |
| Classification | NTL - AVIATION - AVIATION; NTL - AVIATION - Air Traffic Control |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1476340 |
| Report Number | NASA/CR-2003-212673 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/46000/46000/46048/NASA-2003-cr212673_ZhangWangHardin.pdf |
| Format | |
| Database | NTL Digital Repository |