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Virginia Tech

1. Jung, Se Yong. Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves.

Degree: PhD, Aerospace Engineering, 2020, Virginia Tech

A unified maneuvering and seakeeping model for a submerged vessel maneuvering near waves describes mathematically the relationship between input values to the dynamical system, such as thrust from the propulsors, and output values from the system, such as the position and orientation of the vessel. This unified model has a wide range of applications, ranging from vessel hull form optimization in the early design phase to motion controller tuning after the vessel has been constructed. In order for a unified model to make accurate predictions, for instance, for a submerged vessel making a rapid turn near large waves, nonlinear effects have to be included in the model formulation. To that end, a nonlinear motion model for a marine craft affected by a free surface has been developed using Lagrangian mechanics. This dissertation describes an approach for determining the parameters of the nonlinear motion model using a potential flow panel code, which is originally designed to determine flow velocity of the fluid and pressure distribution over marine vessels. The nonlinear motion model is reformulated and the software implementation is modified to support parameter computations. In addition, the methods are numerically validated by comparing computations using the model against solutions output by the panel code. Compared to traditional parameter estimation approaches, the proposed methods allow for a more accurate and efficient determination of parameters of the nonlinear potential flow model for a submerged vessel operating near waves. The resulting Lagrangian nonlinear maneuvering and seakeeping (LNMS) model with determined parameters is able to capture critical nonlinear effects and has applications such as nonlinear control design, rapid design optimization and training simulator development. Advisors/Committee Members: Woolsey, Craig A. (committeechair), Brizzolara, Stefano (committeechair), Valentinis, Francis (committee member), Paterson, Eric G. (committee member).

Subjects/Keywords: submerged vessel dynamics; hydrodynamic force; Lagrangian mechanics; free surface; maneuvering and seakeeping

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jung, S. Y. (2020). Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/97332

Chicago Manual of Style (16th Edition):

Jung, Se Yong. “Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves.” 2020. Doctoral Dissertation, Virginia Tech. Accessed April 01, 2020. http://hdl.handle.net/10919/97332.

MLA Handbook (7th Edition):

Jung, Se Yong. “Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves.” 2020. Web. 01 Apr 2020.

Vancouver:

Jung SY. Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves. [Internet] [Doctoral dissertation]. Virginia Tech; 2020. [cited 2020 Apr 01]. Available from: http://hdl.handle.net/10919/97332.

Council of Science Editors:

Jung SY. Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves. [Doctoral Dissertation]. Virginia Tech; 2020. Available from: http://hdl.handle.net/10919/97332

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