Accession Number : ADA271544

Title :   Out of Plane Solutions of Submarines in Free Positive Buoyancy Ascent.

Descriptive Note : Master's thesis Sep 92-Jun 93,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Aydin, Ibrahim

Report Date : JUN 1993

Pagination or Media Count : 143

Abstract : This thesis analyzes the problem of motion stability of submarines in free positive buoyancy ascent under casualty conditions such as control surface jam and loss of propulsion system response. We employ fully nonlinear, coupled six degree of freedom equations of motion and we allow response to occur in combined vertical and horizontal planes. Continuation and homotopy theory techniques are utilized to trace all possible steady state solutions in six degrees of freedom, while local perturbation reveals their stability properties. Vehicle geometric properties and control surface deflections are used as primary bifurcation parameters. Regions in parameter spaces are identified where extreme sensitivity of solutions to geometric properties and hydrodynamic modeling is present. Submarine stability, Continuation, Bifurcation, Pitchfork, Hysteresis, Cusp.

Descriptors :   *BUOYANCY, *SUBMARINES, ALGEBRAIC TOPOLOGY, CASUALTIES, CONTROL, CONTROL SURFACES, DEFLECTION, DEGREES OF FREEDOM, EQUATIONS, EQUATIONS OF MOTION, HYDRODYNAMICS, HYSTERESIS, MOTION, PARAMETERS, PERTURBATIONS, PROPULSION SYSTEMS, REGIONS, RESPONSE, SENSITIVITY, STABILITY, STEADY STATE, SURFACES, THEORY, THESES, VEHICLES, GEOMETRY, DYNAMIC RESPONSE.

Subject Categories : Submarine Engineering
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE