Accession Number : ADA331440

Title :   Nonlinear Analysis of Coupled Roll/Sway/Yaw Stability Characteristics of Submersible Vehicles

Descriptive Note : Master's thesis

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Tsamilis, Sotirios E.

PDF Url : ADA331440

Report Date : MAR 1997

Pagination or Media Count : 84

Abstract : The problem of coupled roll, sway, and yaw stability analysis of submersible vehicles is analyzed, with particular emphasis on nonlinear studies. Previous results had indicated that a primary loss of stability is through the development of limit cycles. This loss of stability is due to the coupling of roll into sway and yaw and cannot be predicted by considering the uncoupled dynamics. In this study, it is shown that the mechanism of loss of stability is through bifurcations to periodic solutions. These are characterized as either subcritical or supercritical, depending on the sign of a certain nonlinear coefficient. Implications of these results to vehicle performance and operations are discussed.

Descriptors :   *SHIP MOTION, *DIFFERENTIAL EQUATIONS, *HYDRODYNAMICS, *SUBMERSIBLES, COMPUTER PROGRAMS, COMPUTERIZED SIMULATION, ROLL, PITCH(MOTION), YAW, EQUATIONS OF MOTION, HYDRODYNAMIC CHARACTERISTICS, THESES, BIFURCATION(MATHEMATICS).

Subject Categories : Submarine Engineering
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE