Nonlinear analysis of coupled roll/sway/yaw stability characteristics of submersible vehicles
By: by Sotirios E. Tsamilis
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1997
Place of publication: Monterey, Calif
Language: eng
Number of pages: 75
Subjects: Stability; Mathematical models; Submersibles; Hydrodynamics; Simulation methods
Description: 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.
Notes: Thesis (master's)--Naval Postgraduate School, 1997.