Ground effects in FAA's integrated noise model

Fleming, Gregg G.; Burstein, Joseph; Rapoza, Amanda; Senzig, David A.; Gulding, John

doi:10.3397/1.2827979

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…In reality, the snow cover can vary a great deal having, for example, effective flow resistivities ranging from 10 to 50 cgs Rayls or more 21 . In order to account for a more complex set of ground effects, it may be more appropriate to implement a ground effects database such as is proposed by Fleming et al 29 .…”

Section: Discussionmentioning

confidence: 99%

“…For acoustically soft ground, this interference pattern results in a reduction in the source level. Although an advanced database has been developed for a research version of INM to account for ground effects under a wide range of ground-cover conditions 29 , the database has not yet been implemented into the mainstream model, and in particular the version of the model that computes Audibility. At present, INM models acoustically soft ground effects with an empirical curve based on field grass (150 cgs Rayls 6) ) which does not sufficiently represent the highly absorptive ground effects associated with modeling propagation over granular snow (40 cgs Rayls).…”

Section: Fig 4-sample One-third Octave Band Noise Spectra (L Amax Atmentioning

confidence: 99%

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Development of a tool for modeling snowmobile and snowcoach noise in Yellowstone and Grand Teton National Parks

Hastings¹

2010

ncej

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The National Park Service (NPS) develops winter use plans for Yellowstone and Grand Teton National Parks to help manage the use of Over-Snow Vehicles (OSVs), such as snowmobiles and snowcoaches. The use and management of OSVs in the parks is an issue because of potential environmental impacts and because of actions by environmental, recreational, and commercial groups. The U.S. Department of Transportation, Research and Innovative Technology Administration, John A. Volpe National Transportation Systems Center (the Volpe Center) supported the NPS by modeling the acoustical environment in the parks associated with potential modeling alternatives as well as current and historical conditions. The modeling considered a number of alternatives for inclusion in the NPS's winter use plans. These alternatives affect the type and number of OSVs that are allowed to operate in the parks and where they are allowed to travel. The acoustical modeling was performed by using the Federal Aviation Administration's (FAA) Integrated Noise Model (INM), adapted for use with OSVs. INM adaptation included the development of an over-ground sound propagation model to account for propagation over snow-covered terrain. The Volpe Center also developed a new OSV noise database, which defined OSV noise as a function of speed and source-to-receiver distance, based on previously published OSV acoustical studies and winter 2005-2006 measurements. Vehicle types modeled included two-and four-stroke snowmobiles as well as two-and four-track snowcoaches.

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Section: Discussionmentioning

confidence: 99%

Section: Fig 4-sample One-third Octave Band Noise Spectra (L Amax Atmentioning

confidence: 99%

Development of a tool for modeling snowmobile and snowcoach noise in Yellowstone and Grand Teton National Parks

Hastings¹

2010

ncej

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“…These ground effects regressions are detailed extensively in Ref. 9. Also, because ground effects for propagation over an acoustically hard surface are more predicable than for propagation over an acoustically soft surface, engine installation effects could be more easily quantified.…”

Section: B Objectivesmentioning

confidence: 99%

Lateral attenuation of aircraft sound levels over an acoustically hard water surface: Logan airport study

Fleming¹,

Senzig²,

Clarke³

2002

Noise Control Eng. J.

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A noise measurement study was conducted at Logan International Airport in Boston, Massachusetts, during the summer of 1999 to examine the applicability of currently available mathematical models of lateral sound attenuation. Analysis of the data collected revealed that lateral attenuation is a function of the location of the engines on the aircraft, i.e., tail-mounted versus wing-mounted. Attenuation for aircraft with tail-mounted engines was found to agree with the published literature, as well as that included in existing aircraft noise models. Attenuation for aircraft with wing-mounted engines was found to be less than that documented in the literature. This lower lateral attenuation for aircraft with wing-mounted engines results in a general under-prediction of side-line noise by the existing noise models. © 2002 Institute of Noise Control Engineering.

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Aircraft noise prediction

Filippone

2014

Progress in Aerospace Sciences

131

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Ground effects in FAA's integrated noise model

Cited by 5 publications

References 9 publications

Development of a tool for modeling snowmobile and snowcoach noise in Yellowstone and Grand Teton National Parks

Development of a tool for modeling snowmobile and snowcoach noise in Yellowstone and Grand Teton National Parks

Lateral attenuation of aircraft sound levels over an acoustically hard water surface: Logan airport study

Aircraft noise prediction

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