Accession Number : AD0017823


Title :   A LINEAR THEORY OF SHIP MOTION IN IRREGULAR WAVES


Corporate Author : CALIFORNIA UNIV BERKELEY WAVE RESEARCH LAB


Personal Author(s) : FUCHS, R A ; MACCAMY, R C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/017823.pdf


Report Date : Jul 1953


Pagination or Media Count : 33


Abstract : An analysis was made of the heaving and pitching motions of unpropelled ship models in irregular bow and stern seas. A knowledge of the water- surface history at 1 station along the model and a Fourier integral analysis were used to obtain time histories of the motions in terms of convolution-type integrals of the motion and a kernel function. The latter was the Fourier transform of the response to a sinusoidal forcing function. The Froude-Kriloff hypothesis was used to compute kernels for oscillations of a rectangular block. The kernel for a model of ship form was determined from experiments with sinusoidal and irregular waves. Predicted and recorded time histories showed good agreement.


Descriptors :   *FOURIER ANALYSIS , *FOURIER TRANSFORMATION , TIME , RECTANGULAR BODIES , SHIP STERNS , OCEANS , SHIP MODELS , OSCILLATION , KERNEL FUNCTIONS , PITCH(MOTION) , HISTORY


Subject Categories : Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE