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LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) RESEARCH & DEVELOPMENT FOR TSV APPLICATIONS

LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) RESEARCH & DEVELOPMENT FOR TSV APPLICATIONS. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS). TOPICS. Buoyancy and Stability Characteristics of the LMCS Concept. 1/12th Scale Model Buoyancy & Stability Tests Failure Mode Evaluation

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LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) RESEARCH & DEVELOPMENT FOR TSV APPLICATIONS

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  1. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) RESEARCH & DEVELOPMENT FOR TSV APPLICATIONS

  2. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) TOPICS • Buoyancy and Stability Characteristics of the LMCS Concept. • 1/12th Scale Model Buoyancy & Stability Tests • Failure Mode Evaluation • Flotation Geometry Study • Inflated Structure • Damage Containment & Mitigation • Air Containment Concepts

  3. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Buoyancy and Stability Characteristics of the LMCS Concept A payload of a simulated Abrams tank (74 short tons) is positioned amidships to ascertain floatation characteristics.

  4. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Buoyancy and Stability Characteristics of the LMCS Concept QED, Inc. Calibrated Test Facility (1 Acre Pond) QED, Inc. Calibrated Cat (Weight 25 lbs)

  5. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests • The purpose of the tests was to evaluate the load-carrying capacity of the LMCS concept. • The model was set in a special-purpose, water-filled tank with means of measuring attitude of each float and applied loads. • All data was recorded on Excel spreadsheet. • Photographs were taken of key test features.

  6. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Calibration Method For Deck Position 1/12th Scale Model Place Holders For Positioning Weights Purpose Built Tank

  7. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests LMSC modules heave position measured at fixed points Pressure in bladders carefully controlled

  8. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests • Model float identifiers • Model weight locations • Corner locations forheight measurementsThe vertical locationof all four corners ofall six floats were readfor each test run

  9. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Weights were added in precise locations and recorded along with platform position and bladder pressure Roll characteristics were evaluated by off-setting weights

  10. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests • Runs 1-7 Pressure set to 0.2 psi (5.5 inches on water-filled manometer) • Runs 8-22 Pressure set to 0.6 psi (15.5 inches on water-filled manometer) • Runs 23-36 Pressure set to 0.6 psi (31 inches on water-filled manometer) • Runs 37-45 Forward tube under Float D vented to represent failure mode • Runs 1-4 Adding weights to Float D only • Runs 5-6 Moving rows of weights forward

  11. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Runs 1-4. Heave stiffness is very linear

  12. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Runs 8-11. Heave stiffness increases with pressure

  13. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Runs 23-26. Heave stiffness increases with pressure

  14. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Load is supported by more floats as pressure is increased

  15. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Increasing pressure makes causeway stiffer

  16. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) 1/12-Scale LMCS Buoyancy & Stability Tests Demonstration of failure mode and effect of load spread

  17. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Flotation Geometry Study 25-ft 10-ft 1-ft Hard Structure Height 5.5-ft Baseline LMCS Concept Dimensions 5-ft Dia

  18. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Flotation Geometry Study 5.5-ft 10-ft 8.5-ft 8-ft 8.5-ft

  19. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Damage Containment & Mitigation 10-ft 8.5-ft 8-ft 8.5-ft

  20. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Air Containment Concepts Tough exoskeleton of woven polyester webbing Inner shell of elastomer coated fabric Primary air containment bladder

  21. LIGHTWEIGHT MODULAR CAUSEWAY SECTION (LMCS) Summary • LMCS 1/12th scale model tests provided: • Useful insights into flotation characteristics • An empirical data base for comparison with analytical models • Confirmation of pressure/stiffness relationship of strap constrained LMCS platform concept • Geometry study confirms deeper platform can meet buoyancy/freeboard requirements • Pressure bag failure modes analysis is ongoing exploring: • Puncture resistance using multi-layered containment system • Secondary (i.e backup) bladders • Foam filled for specific applications

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