| Title | A sensitivity analysis comparing two procedures for adjusting as-measured spectra to reference conditions |
|---|---|
| Record ID | 34899 |
| Personal Name Creator |
Roof, C. J.; Fleming, Gregg G.; Rickley, Edward J.; Reherman, Clay N |
| Source | 75p. in various pagings |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.) |
| Publisher | United States. Department of Transportation. Federal Aviation Administration |
| Publication Date | 20020400 |
| Language | English |
| Abstract | The Society of Automotive Engineers’ (SAE) Aerospace Recommended Practice (ARP) No. 866A (866A), and a procedure utilizing pure-tone absorption equations developed in support of the International Organization for Standardization’s (ISO) 9613-1 and the American National Standards Institute’s (ANSI) S1.26-1995, are compared and a sensitivity analysis undertaken. The ISO and ANSI equations are identical to each other. Thirteen takeoff and two approach spectra for aircraft were utilized in the analysis, as well as one takeoff, two approach, and three flyover spectra for helicopters. As-measured spectra were processed at 10 standard distances between 200 ft. and 25,000 ft., and at five different temperature/ relative humidity (RH) combinations, to generate adjusted spectra and associated LASmx values. The focus of the study is a refined version of the ISO/ANSI adjustment procedure developed specifically for application to one-third octave-level data. |
| Rosap ID | dot:8907 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/8907 |
| TRT Terms | Aircraft noise; Helicopters; Measurement; Atmospheric phenomena; Sensitivity analysis; Sound level; Standards; Alternatives analysis |
| General Subjects | Society of Automotive Engineers (SAE); International Organization for Standardization; Noise levels; dBA; Atmospheric absorption; One-thhird octive noise spectra |
| Classification | NTL - AVIATION - AVIATION; NTL - AVIATION - Aviation Energy and Environment |
| Geographical Coverage |
United States |
| Contract Number | FA-53/BS232 |
| Report Number | DOT-VNTSC-FAA-05-09 |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Tech Report |
| URL | https://ntlrepository.blob.core.windows.net/lib/34000/34800/34899/DOT-VNTSC-FAA-05-09.pdf |
| Format | |
| Database | NTL Digital Repository |