MIT2_019S11_MD1 - 2.019 Design of Ocean Systems ecture 12...

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Unformatted text preview: 2.019 Design of Ocean Systems ecture 12 Lecture 12 Mooring Dynamics (I) March 18, 2011 Position keeping Chain, wire, rope, … Steel, natural fibre, synthetic fibre Good for tension, ineffective for compression, bending moment, Tension are provided by weight and elasticity of cables Vertical mooring: TLP Spreading mooring: FPSO, SPAR Reference: O. M. Faltinsen, 1990 Sea Loads on Ships and Offshore Structures, Cambridge University Press Given top end position or tension at the top end, to find: • onfiguration of the cable: s( or ( x( φ ), ( z( φ or z(x) ) or z(x) Configuration of the cable: s( φ ) or • Tension along the cable: T(s) or T(x) or T(z). T T H ϕ ϕ W ϕ O = 0 x B x h Anchor z x Seafloor s Image by MIT OpenCourseWare. Static Analysis of a Cable Line T+dT- ρ gzA- ρ gAdz dz ϕ + d ϕ dx D F wds ϕ T - ρ gzA ds + __ ds AE T W T Cable tension F, D A Water weight per unit length Current induced hydrodynamic loads Area of the cross section of the cable Tangential direction:...
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MIT2_019S11_MD1 - 2.019 Design of Ocean Systems ecture 12...

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