THE STATIC CONFIGURATION OF A TRI-MOORED, SUBSURFACE, BUOY-CABLE ARRAY ACTED ON BY CURRENT-INDUCED FORCES.
NAVAL RESEARCH LAB WASHINGTON D C
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A rapid and accurate method is developed for determining the static configuration of and tensions in a buoy-cable array that consists of a subsurface float anchored to the bottom by three cable legs. The array is acted on by weight and buoyancy forces and by current-induced forces that depend on the position and orientation of the cables in the water. A lumped parameter representation of the structure is assumed, and the analysis is performed by using the method of imaginary reactions to determine the equilibrium configuration of the array under constant applied forces and the method of successive approximations to iterate on the position-dependent current forces. Expressions are derived for the hydrodynamic forces, and both normal and tangential drags are included. The analysis allows for the possibility that a variety of discrete-element measuring and flotation devices are attached to the cable legs. A computer program for implementing the analysis is included, and a sample calculation is given to demonstrate the use of the program and to show the rapid convergence of the analytic method. Author
- Machinery and Tools
- Marine Engineering
- Fluid Mechanics