Engine Installation Effects of Four Civil Transport Airplanes: Wallops Flight Facility Study

The National Aeronautics and Space Administration (NASA), Langley Research Center (LaRC) and the Environmental Measurement and Modeling Division of the United States Department of Transportation's John A. Volpe National Transportation Systems Center (Volpe) conducted a noise measurement study at NASA's Wallops Flight Facility, Virginia, to examine the effects of engine installation on the noise of four civil transport airplanes: a Boeing 767-400, a McDonnell-Douglas DC9, a Dassault Falcon 2000, and a Beechcraft King Air. Acoustic data were collected using a twenty-microphone array configured in a "U" shaped arrangement, with ten microphones mounted on two construction cranes at heights up to 200 ft above ground level, five microphones on each crane, and ten microphones mounted on poles each at height of 24 ft above ground level. In addition to detailed acoustic data, time-space position and meteorological data were also measured. This report presents the results of the study, compares those results with the Society of Automotive Engineers' Aerospace Information Report 1751, and proposes basing new lateral attenuation models on separate engine installation effects and ground effects components.

[1]  M. Lighthill.  On sound generated aerodynamically I. General theory , 1952, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[2]  J. E. Piercy,et al.  Effective flow resistivity of ground surfaces determined by acoustical measurements , 1983 .

[3]  Kenneth D. Wright,et al.  Field-Deployable Acoustic Digital Systems for Noise Measurement , 2000 .

[4]  Michael Geyer,et al.  A Differential Global Positioning System for Determining Time Space Position Information in Support of Aircraft Noise Certification , 2001 .

[5]  C. Chessell.  Propagation of noise along a finite impedance boundary , 1977 .

[6]  W. L. Willshire.  Lateral Attenuation of High-By-Pass Ratio Engined Aircraft Noise , 1981 .

[7]  E. N. Bazley,et al.  Acoustical properties of fibrous absorbent materials , 1970 .

[8]  B. F. Berry,et al.  Modeling Lateral Attenuation of Aircraft Flight Noise , 1991 .

[9]  Christopher J Roof,et al.  Integrated Noise Model (INM) Version 7.0 Technical Manual , 1997 .

[10]  Dwight E. Bishop,et al.  Study of Lateral Excess Sound Attenuation as Determined from Far Part 36 Aircraft Noise Certification Measurements. , 1980 .

[11]  Hugh L. Dryden,et al.  THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION , 1958 .

[12]  John-Paul Clarke,et al.  Lateral attenuation of aircraft sound levels over an acoustically hard water surface : Logan Airport study , 2002 .

[13]  Charles G. Hodge.  Quiet aircraft design and operational characteristics , 1991 .

[14]  Jonathan B. Freund,et al.  Ray Traces through Unsteady Jet Turbulence , 2002 .

[15]  Uno Ingard,et al.  A Review of the Influence of Meteorological Conditions on Sound Propagation , 1953 .

[16]  J. Michael,et al.  Rotorcraft Noise Model , 1997 .

[17]  F. Yuan,et al.  SPONSORING / MONITORING AGENCY NAME(S) AND ADDRESS(ES) , 1999 .

[18]  David L. Gray,et al.  A field-deployable digital acoustic measurement system , 1991 .