| Title | An examination of the spectral class low frequency limit for helicopters |
|---|---|
| Record ID | 51025 |
| Personal Name Creator |
Schulz, Noah E.; Boeker, Eric |
| Source | 59p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Corporate Contributor |
United States. Department of Transportation. Federal Aviation Administration. Office of Environment and Energy |
| Publisher | John A. Volpe National Transportation Systems Center (U.S.) |
| Publication Date | 20110100 |
| Language | English |
| Abstract | Currently, INM and AEDT do not use spectral data below 50 Hz in their noise computations. However, helicopter rotor rotational noise is dominant below 50Hz, with a fundamental frequency at the blade-pass frequency (BPF) and harmonics at integer multiples of BPF. Noise data for several helicopters have been measured for inclusion in the INM/AEDT database with expanded spectral data down to 12.5 Hz. The purpose of this effort is to determine what effects, if any, inclusion of low frequency data will have on resulting noise modeling. The results of which would determine if and how an expanded-spectra capability should be included in AEDT. |
| Rosap ID | dot:12003 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/12003 |
| TRT Terms | Helicopters; Aircraft noise; Sound level; Measurement of electromagnetic phenomena; Noise sources |
| General Subjects | Noise prediction; Noise model; Helicopter noise; Integrated Noise Model; Helicopter noise data; Noise metrics; Low frequency noise |
| Classification | NTL - ENERGY AND ENVIRONMENT - Aviation Energy and Environment; NTL - ENERGY AND ENVIRONMENT - ENERGY AND ENVIRONMENT; NTL - AVIATION - Aviation Energy and Environment |
| Geographical Coverage |
United States |
| TRIS Online Accession No |
1506238 |
| Report Number | DOT-VNTSC-FAA-14-03 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/51000/51000/51025/Helicopter_LowFrequency_final.pdf |
| Format | |
| Database | NTL Digital Repository |