Accession Number : AD0746490

Title :   The Dynamics of a Ship Moored by a Cable System Under Sea State Excitation,

Corporate Author : CATHOLIC UNIV OF AMERICA WASHINGTON D C INST OF OCEAN SCIENCE AND ENGINEERING

Personal Author(s) : Zarnick,E. E. ; Casarella,M. J.

Report Date : JUL 1972

Pagination or Media Count : 117

Abstract : An analytic study is made of a multi-leg buoy-moored ship in deep water waves. The equation of motion for a free floating ship is combined with the catenary equations for mooring lines to model mathematically the moored-ship system. The seaway excitations consist of very large first order forces at wave frequencies and smaller second order forces or drift forces at near zero frequencies. The results of a computer study of a moored Mariner Class ship in waves show that, for a large ship, the mooring system has little influence on the motions at wave frequencies and are essentially the same as those of the unrestrained ship. (Author)

Descriptors :   (*SHIPS, MOORING), (*MOORING, DEEP WATER), MECHANICAL CABLES, EQUATIONS OF MOTION, MATHEMATICAL MODELS, DRIFT, EXCITATION, TENSILE PROPERTIES, OCEAN WAVES, DYNAMICS

Subject Categories : Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE