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A Parametric Model for Predicting Submarine Dynamic Stability in Early Stage Design
Minnick, Lisa Marie
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The goal of this thesis is to develop a dynamic stability and control module that can be used in the concept exploration phase of design. The purpose of the module is to determine the hydrodynamic coefficients/derivatives and stability characteristics of a given design. Two tools, GEORGE and CEBAXI and LA_57, were used to model a submarine, calculate its hydrodynamic coefficients, and determine its stability in the horizontal and vertical plane. GEORGE was developed and used heavily at Naval Coastal Systems Laboratory (NSWCPC) in Panama City, FL and the CEBAXI and LA_57 program was developed partially at University of California State at Long Beach and at the Carderock Division of the Naval Surface Warfare Center (NSWCCD) and is in use at NSWCCD in Bethesda, MD. Both programs require the hull offsets and geometry of the control surfaces as input. The hull offsets were determined by assuming an idealistic teardrop shape and a method for sizing control surfaces was developed by using previous designs to determine sizing trends. ModelCenter software was used to integrate the methods to determine the offsets and control surface geometry with the stability programs. A design of experiments was performed to determine the influence of various input variables on the stability indices and response surface models were created. The response surfaces were implemented into a Total Ship Systems Engineering optimization process used in the senior ship design course at Virginia Tech.
- Masters Theses