Accession Number : AD0427841


Title :   ANALYTICAL STUDY OF FORCED SHIP MOTIONS.


Descriptive Note : Final rept., 1 Oct 62-30 Sep 63.


Corporate Author : CONTROL DATA CORP MELVILLE N Y TRG DIV


Report Date : 20 Sep 1963


Pagination or Media Count : 39


Abstract : Various results in the theory of ship motions are described. The Kramers-Kronig relations were extended to the case of forward speed and crosscoupling, in the absence of negative damping. Some initial steps were taken in the direction of calculating Hi-Fi damping coefficients for heaving ellipsoids. The behaviour of damping coefficients at low frequency, for asymmetric motions, was investigated in its own right and in connection with the Hi-Fi method. It was shown that, with zero speed, the cross-coupling coefficients can be found from the wave amplitudes in the forced motion problems. Finally, some thought was given to a new kind of slender body theory for ship motions. (Author)


Descriptors :   MOTION , VELOCITY , DAMPING , ELLIPSOIDS , WATER WAVES , SLENDER BODIES , OSCILLATORS , HARMONIC GENERATORS , ROLL , YAW , GRAVITY , OSCILLATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE