Accession Number:

AD0262696

Title:

INSTABILITY OF SHIP MOTIONS IN LONGITUDINAL WAVES RESULTING FROM NONLINEAR COUPLING

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1961-05-01

Pagination or Media Count:

1.0

Abstract:

An investigation was made of the effect of certain nonlinear coupling terms on the heave-pitchroll motions of a ship moving in longitudinal waves either head or following waves. Linear damping terms were retained in the analysis because when forced ship motions under wave excitation are studied, the damping terms are essential elements of the problem. The analysis for the heave-pitch-roll system showed the existence of a type of instability such that the responses in pitch or roll may grow without bound even when the effect of damping was taken into account because of nonlinear coupling between heave and pitch and between heave and roll. This is in contrast to the results obtained from the linear theory in which, because of the presence of damping, all the responses are finite. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE