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MOBILE OFFSHORE BASE RESEARCH CHALLENGES

MOBILE OFFSHORE BASE RESEARCH CHALLENGES. Dr. Paul Palo U. S. Naval Facilities Engineering Service Center Centre for Ships and Ocean Structures Norwegian University of Science and Technology 29 October 2004. Outline. Summary: ONR MOB S&T Program Research Challenges.

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MOBILE OFFSHORE BASE RESEARCH CHALLENGES

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  1. MOBILE OFFSHORE BASE RESEARCH CHALLENGES Dr. Paul Palo U. S. Naval Facilities Engineering Service Center Centre for Ships and Ocean Structures Norwegian University of Science and Technology 29 October 2004

  2. Outline • Summary: ONR MOB S&T Program • Research Challenges

  3. MOB HydromechanicsS&T Summary • Broad, balanced program addressing a range of S&T topics corresponding to MOB design • Driven by: USER! • operational, survival and transit aspects • wide range of MOB platform characteristics • ALL accompanying support information • Deliverables include: • preliminary and final analysis tools • pioneering hydroelastic models and data • wave excitation - structural loads interface • pioneering wave coherence information

  4. MOB HydromechanicsS&T Technology Transfer • MOB Hydromechanics S&T is applicable to all large offshore vessels and structures • Commercial airports (cargo) • Remote military training airfields

  5. MOB HydromechanicsS&T Summary • Key S&T Opportunities: • Analyze hydroelastic data! • Continue wave coherence studies • Complete Classification Guide • develop a technique that will apply viscous damping to VLFS structures with “small” modules

  6. Crest Only; “This is not a wave.” “Paired Crest + Trough; “This is a wave.” “Disjointed Crest; “This is unknown!” “What is a [3D] ‘wave’?”

  7. MOB Hydromechanics4.1 Automatic Control: Multibody Dynamic Positioning UC Berkeley Algorithms and Demonstration

  8. Exper, freq domain @ fforcing LAMP @ fforcing + fnat anat ~ 4 * aforcing MOB Hydromechanics2.1.1 Time Domain Limitations, LAMP Pitch (t) Semis have low pitch radiation damping. LAMP model generated resonance during the ramp, no decay mechanism.

  9. MOB HydromechanicsOther “VLFS” Structures Amphibious Lighterage Waterside Security Barriers

  10. MOB HydromechanicsNavy Amphibious Lighterage • Platform dimensions • Module: 100 by 24 by 2 ft, 100 tons (30 by 7 by .6 m) • Causeway: 1,200 ft (366 m) • Water depths: 0 to 9 m

  11. + Sway + Sway Front Back Middle MOB HydromechanicsNavy Amphibious Lighterage • Problem: damping!

  12. MOB HydromechanicsNavy Waterside Barriers • “VLFS?” Note aspect ratio! • Problem: damping again.

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