| Title | Updated Lateral Attenuation in FAA’s Integrated Noise Model |
|---|---|
| Record ID | 47762 |
| Personal Name Creator |
Fleming, G. G.; Burstein, J.; Rapoza, A S; Senzig, D. A.; Gulding, J.M.; Connor, T.L. |
| Source | 29th International Congress and Exhibition on Noise Control Engineering, 27-30 August 2000, Nice, France |
| Corporate Creator | John A. Volpe National Transportation Systems Center (U.S.). Acoustics Facility; 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 | 20000827 |
| Language | English |
| Abstract | The lateral attenuation algorithm in the Federal Aviation Administration's (FAA) Integrated Noise Model (INM) has historically been based on the two regression equations described in the Society of Automotive Engineers' (SAE) Aerospace Information Report (AIR) 1751. These equations, which together represent a single relationship developed from measured data for 1960s and 1970s aircraft with low-bypass ratio jet engines, are applied equally in INM to the entire aircraft fleet. Further, these equations cannot take into account the effects of propagation over acoustically hard terrain, such as water. Consequently, in 1997 the INM development team initiated the task of revising the lateral attenuation algorithm within the model. The primary component of the revised algorithm is an entirely new methodology for taking into account ground effects. The methodology, which is based upon a newly-compiled spectral data base, along with the physical acoustics model of Embleton, Piercy and Daigle, will exist in INM as a library of regression equations. As such, this approach will offer the accuracy and flexibility of a pure physical acoustics model, coupled with relatively modest computer runtimes. This paper documents the scientifically-founded and experimentally-validated approach to computing ground effects, which is slated for inclusion in the INM. |
| Rosap ID | dot:9995 |
| Rosap URL | https://rosap.ntl.bts.gov/view/dot/9995 |
| TRT Terms | Sound attenuation; Sound absorption; Water areas; Algorithms; Regression analysis; Ground effect |
| General Subjects | Aircraft noise; Integrated Noise Model; Lateral attenuation; Excess ground attenuation |
| Classification | NTL - AVIATION - Aviation Energy and Environment; NTL - ENERGY AND ENVIRONMENT - Environment Impacts; NTL - ENERGY AND ENVIRONMENT - Aviation Energy and Environment |
| Geographical Coverage |
United States |
| Availability | Volpe National Transportation Systems Center, Technical Reference Center |
| Resource type | Proceedings |
| URL | https://ntlrepository.blob.core.windows.net/lib/47000/47700/47762/dts-34-00_6.pdf |
| Format | |
| Database | NTL Digital Repository |