Penetration of sonic boom energy into the ocean PDF Download
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Author: John F. Waters
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Category :
Languages : en
Pages :
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Author: John F. Waters
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Category :
Languages : en
Pages :
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Author: H. K. Cheng
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Category :
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 181
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Sonic boom noise from overwater supersonic aircraft operations penetrates into the water. The present work developed an algorithm to simulate this penetrating sonic boom noise for realistically shaped sonic booms, predictions previously unavailable. The new algorithm assumes that the water surface is fairly flat and that the water is deep enough so that bottom reflections can be ignored. The algorithm was used to model the underwater sonic boom noise for the cases of incident sonic boom waves distorted by atmospheric effects and by common aircraft maneuvers. It was found that certain aircraft maneuvers and atmospheric effects can increase the penetration of the sonic boom noise, while others decrease it.
Author: Daniel G. Baize
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ISBN:
Category : High-speed aeronautics
Languages : en
Pages : 434
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Author: Robert J Urick
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Category : Airplanes
Languages : en
Pages : 32
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Sonic booms laid down by Navy fighter aircraft flying at Mach 1.1-1.2 have been observed below the surface of the sea by means of a string of hydrophones 195 feet long dangling from a surface ship. The underwater booms were found to decay about as the -3/2 power of the depth below the surface, to have the same spectral content as the boom in air, and to travel down the string with the velocity of sound in water. These findings contradict the theory of an 'inhomogeneous' wave incident beyond the critical angle, as originally stated by Rayleigh and as recently extended to sonic booms by Sawyers and Cook. They suggest, instead, that the underwater sonic boom is a wave scattered by the rough sea surface into the sea below. Its decay with depth is so rapid that it is not likely to be perceptible against the ambient noise background at depths greater than one or two thousand feet in the deep sea. (Author).
Author: Harvey H. Hubbard
Publisher:
ISBN:
Category : Sonic boom
Languages : en
Pages : 52
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Author:
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Category : Aeronautics
Languages : en
Pages : 260
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Author: David A. McCurdy
Publisher:
ISBN:
Category : High-speed aeronautics
Languages : en
Pages : 236
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Author:
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ISBN:
Category :
Languages : en
Pages : 28
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A laboratory experiment was designed and performed to ascertain the difference in underwater response to sonic boom laboratory between flat and wavy surface models and their depth-dependent rule overpressure attenuation. Waveforms of overpressure were recorded in a water-filled tank, fitted with a surface-wave maker, during over-flight of the supersonic projectiles. Sawyers' (1968) theory for the flat interface has been validated to a depth of at least four signature lengths. The theory of Cheng and Lee (2000) for a wavy surface has been confirmed in several respects. Firstly, the predicted overpressure attenuation with depth to the one-half power has been found to be correct over depths up to four signature lengths. Secondly, the predicted frequencies and the fore-to-aft frequency shift have been confirmed by these laboratory-scale experiments.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 88
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