United States Department of Transportation
i
Ground effects in FAA's Integrated Noise Model
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2000-01-01
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[PDF-83.70 KB]
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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.
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