Summary of Sonic Boom Rise Times Observed During FAA Community Response Studies Over a 6-Month Period in the Oklahoma City Area
Summary of Sonic Boom Rise Times Observed During FAA Community Response Studies Over a 6-Month Period in the Oklahoma City Area

Author: National Aeronautics and Space Adm Nasa

Publisher: Independently Published

Published: 2018-11-14

Total Pages: 124

ISBN-13: 9781731319920

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The sonic boom signature data acquired from about 1225 supersonic flights, over a 6-month period in 1964 in the Oklahoma City area, was enhanced with the addition of data relating to rise times and total signature duration. These later parameters, not available at the time of publication of the original report on the Oklahoma City sonic boom exposures, are listed in tabular form along with overpressure, positive impulse, positive duration, and waveform category. Airplane operating information along with the surface weather observations are also included. Sonic boom rise times include readings to the 1/2, 3/4, and maximum overpressure values. Rise time relative probabilities for various lateral locations from the ground track of 0, 5, and 10 miles are presented along with the variation of rise times with flight altitude. The tabulated signature data, along with corresponding airplane operating conditions and surface and upper level atmospheric information, are also available on electronic files to provide it in the format for more efficient and effective utilization. Maglieri, Domenic J. and Sothcott, Victor E. Unspecified Center ACOUSTIC VELOCITY; AERODYNAMIC NOISE; NOISE INTENSITY; OVERPRESSURE; SONIC BOOMS; CITIES; FLIGHT ALTITUDE; SIGNATURES; SOUND PRESSURE; SUPERSONIC FLIGHT; WAVE PROPAGATION; WEATHER...

Sonic Booms Resulting from Extremely Low-altitude Supersonic Flight: Measurements and Observations on Houses, Livestock and People
Sonic Booms Resulting from Extremely Low-altitude Supersonic Flight: Measurements and Observations on Houses, Livestock and People

Author: C. W. Nixon

Publisher:

Published: 1968

Total Pages: 36

ISBN-13:

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Sonic booms generated by F-4C aircraft flying low-level terrain- following profiles during Joint Task Force II operations near Tonopah, Nevada, were recorded under and near the flight tracks, and responses of structures, animals, and people were observed. Recorded overpressures up to 144 psf were analyzed, correlated with available aircraft operations data, and compared with data from different aircraft flying similar profiles. Observations of structures, animals, and people were correlated with the measured overpressures. Results include acquisition of near-field recordings of overpressures generated by the F-4C, the finding that some window glass fragments were propelled a short distance rather than falling directly below the window, an instance in which the measured overpressure of a sonic boom 1 mile to the side of the track far exceeded the predicted value, the finding that livestock (undetermined prior exposure to acoustic stimuli in this situation) did not respond adversely to the sonic booms, confirmation that very intense sonic booms do not harm people directly and the reaffirmation that the selection of site locations for low- level supersonic training missions will continue to pose a problem.

Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft
Some Effects of Flight Path and Atmospheric Variations on the Boom Propagated from a Supersonic Aircraft

Author: Raymond L. Barger

Publisher:

Published: 1964

Total Pages: 40

ISBN-13:

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Equations for the shock wave envelope and cusp line associated with the boom propagated from a supersonic aircraft are formulated in terms of the moving-trihedral coordinate system for flight in a uniform atmosphere and also in an atmosphere with a linear sound-speed gradient. Ray-tube theory is used to calculate the lateral distribution of boom intensity in an atmosphere with a linear sound-speed gradient and also to investigate the effect of a general wind and sound-speed gradient on the ground-track intensity. The relative effects of wind and temperature gradient are treated. The mechanism of focusing by winds and by ground structures are discussed qualitatively.