Accession Number : ADP003827

Title :   A Transient Wave Generation Technique and Some Engineering Applications,

Corporate Author : NAVAL ACADEMY ANNAPOLIS MD

Personal Author(s) : Salsich,J. O. ; Johnson,B. ; Holton,C.

Report Date : AUG 1983

Pagination or Media Count : 20

Abstract : Another method has been developed for generating transient waves using the dispersion relationship of water waves. This technique consists of generating a drive signal which combines decreasing frequency with an exponentially increasing amplitude of specified form. The resulting wave energy which is focused at some point downstream of the wavemaker can result in some nonlinear, asymmetric, and/or breaking waves occuring repeatably at the same location in the tank. Location of the breaking wave relative to the predicted convergence point is discussed and the derivation and computation of the drive signal as generated ona Tektronix 4051 microcomputer is described. Some specific examples of the model testing and research applications of this wave generation technique are also described. These include controlled extreme environment testing, capsizing of small vessels in breaking waves, ship responses to 'episodic' waves, and a continuation of deck wetness experiments.

Descriptors :   *Water waves, Generators, Model basins, Computer applications, Amplitude, Frequency, Convergence, Wavefronts, Ship models, Ship hulls, Response, Model tests, Asymmetry, Transients, Drives, Boats, Microcomputers, Control systems

Distribution Statement : APPROVED FOR PUBLIC RELEASE