Hydrodynamic analysis of mooring lines based on optical tracking experiments

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Title: Hydrodynamic analysis of mooring lines based on optical tracking experiments
Author: Yang, Woo Seuk
Abstract: Due to the complexity of body -shape , the investigation of hydrodynamic forces on mooring lines , especially those comprised of chain segments , has not been conducted to a sufficient degree to properly characterize the hydrodynamic damping effect of mooring lines on the global motions of a moored offshore platform . In the present study , an experimental investigation of the hydrodynamic characteristics of various mooring elements is implemented through free and forced oscillation tests . Since no direct measurement capability for distributed hydrodynamic forces acting on mooring line segments such as chain and wire rope is available yet , an indirect measurement technique is introduced . The technique is based on the fact that hydrodynamic forces acting on a body oscillating in still water and on a stationary body in an oscillatory flow are equivalent except for the additional inertia force , the so -called Froude -Krylov force , present in the latter condition . The time -dependent displacement of a slender body moving in calm water is acquired through optical tracking with a high speed camera . The distributed hydrodynamic measurements are then used to obtain the force by solving the equation of motion with the boundary condition provided from tension measurements . Morison ?s equation is employed along with Fourier analysis to separate the inertia and drag components out of the total fluid force . Given the experimentally -derived information on hydrodynamic behavior , the resistance provided by a mooring line to a floating structure is briefly studied in terms of damping and restoring force in a coupled dynamic system .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3273
Date: 2009-05-15

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Hydrodynamic analysis of mooring lines based on optical tracking experiments. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -3273 .

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