u - NREL
u - NREL
u - NREL
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BModes Application<br />
Towers (cont’d)<br />
• Given:<br />
– Elastic tower distributed geometric & structural properties<br />
– Tower-head inertias and c.m. offsets from tower top<br />
– Tension-wires stiffness and geometric layout (*)<br />
– Floating-platform hydrodynamic & hydrostatic properties + mooring<br />
lines 6x6 stiffness matrix (*)<br />
– Monopile foundation elastic properties (*)<br />
– Hydrodynamic added mass on submerged part of the elastic tower (*)<br />
• Computes:<br />
– Modal frequencies & coupled modes<br />
(coupled fore-aft + side-side + twist + axial motion )<br />
National Renewable Energy Laboratory<br />
6<br />
Innovation for Our Energy Future
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