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MIT2_019S11_SK1 - 2.019 Design of Ocean Systems Lecture 5...

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2.019 Design of Ocean Systems Lecture 5 Seakeeping (I) February 18, 2011
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Six-Degree-of-Freedom Motion of a Floating Body in Waves β Waves Propagating yaw heave sway pitch roll z U y x surg e Image b Translation in x: surge ζ 1 (t) Translation in y: sway ζ 2 (t); Translation in z: heave ζ 3 (t); Rotation with x: roll ζ 4 (t); Rotation with y: pitch ζ 5 (t); Rotation with z: yaw ζ 6 (t); y MIT OpenCourseWare.
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Local motions Slamming Water on deck Effect of breaking waves Accelerations Wave bending moments and shear forces Liquid sloshing in Tanks Examples of Seakeeping and Wave Load Problems for Ships and Offshore Structure Image by MIT OpenCourseWare.
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Concerns of Seakeeping in FPSO Design • Increasing maximum loads (due to dynamic pressure) • Affecting operation – Production by Risers – Gas-oil, oil/water separation – Normally, heave amplitude < 4m, pitch amplitude < 5 degrees, roll amplitude < 10 degrees, excursion < (5~8)% water depth • Vibration of superstructures • Fatigue life of hull structures, risers, etc.
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