An Experimental Study of Sonic Boom Penetration Under a Wavy Air-Water Interface PDF Download
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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 : 28
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Book Description
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:
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ISBN:
Category : Fluid mechanics
Languages : en
Pages : 510
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Author: Acoustical Society of America
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Category : Acoustical engineering
Languages : en
Pages : 1596
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Author: Judith L. Rochat
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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: Ira R. Schwartz
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ISBN:
Category : Sonic boom
Languages : en
Pages : 472
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Book Description
Prediction methods for sonic boom generation and propagation with overpressure minimization in supersonic transport design and operation.
Author: American Institute of Aeronautics and Astronautics
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1152
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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
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ISBN:
Category : Sonic boom
Languages : en
Pages : 52
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Author: John F. Waters
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Category :
Languages : en
Pages :
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