Accession Number : AD0433793


Title :   APPLICATION OF LINEAR SUPERPOSITION TECHNIQUES TO THE ROLL RESPONSE OF A SHIP MODEL IN IRREGULAR BEAM SEAS,


Corporate Author : STEVENS INST OF TECH HOBOKEN N J DAVIDSON LAB


Personal Author(s) : Lalangas,Petros A


Report Date : Mar 1964


Pagination or Media Count : 38


Abstract : This report presents experimental results on the roll response of a Series-60, 0.60 block coefficient ship model in long-crested irregular beam waves with significant heights of 1.3 to 4.3% of the model length. Model speed was varied from zero to that corresponding to a Froude number of 0.158. Roll transfer functions derived from the measured roll and wave spectra as determined by linear superposition techniques are compared, to study the linearity of roll response. Measurements of the roll-damping in calm water, for the same speed range, are presented. The effect of speed on the magnitude and linearity of roll-damping is also examined. It is concluded that the principle of linear superposition can be used with reasonable engineering confidence in studying the roll response of fast cargo ships under way in moderate to severe seas. (Author)


Descriptors :   *MERCHANT VESSELS , ROLL , WATER WAVES , STATISTICAL ANALYSIS , OSCILLATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE