Undergraduate Research at the US Coast Guard Academy Dr. Susan - - PowerPoint PPT Presentation

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undergraduate research at the us coast guard academy
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Undergraduate Research at the US Coast Guard Academy Dr. Susan - - PowerPoint PPT Presentation

Jul 02, 2023 152 likes •282 views

Undergraduate Research at the US Coast Guard Academy Dr. Susan Swithenbank SNAME Philadelphia April 20, 2011 Recent Research Scaling Effects of a 100 ft tow tank Stern Flaps on the 378 Cutter Resistance of Bow Bulbs Marine Bio

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Undergraduate Research at the US Coast Guard Academy

  • Dr. Susan Swithenbank

SNAME Philadelphia April 20, 2011

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Recent Research

  • Scaling Effects of a 100 ft tow tank
  • Stern Flaps on the 378’ Cutter
  • Resistance of Bow Bulbs
  • Marine Bio‐Fouling of 110’ CG Cutters
  • Simplified Stability Tests
  • Corrosion
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Tow Tank Scaling Effects

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Stern Flaps on 378’ Cutters

Morgenthau Flap Flap 2 Flap 3 Flap 4 16 kts 7.24% 15.60% ‐7.84% ‐4.87% 17 kts 13.93% 16.58% ‐0.79% 2.15% 18 kts 12.85% 18.69% 3.10% 3.24% Percent Reduction in EHP overBare Hull

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Rendering of hull and bulb in Rhinoceros 4.0

Resistance of Bow Bulbs

Total Cost ($) 427315 Savings per patrol ($) 43627 Patrols per year (180 days) 4 Years to Pay Off 2.4 Bulb 2 (12.3 ft)

Economic Viability:

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Marine Bio‐Fouling of Cutters

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Simplified Stability Testing

  • Vessels must
  • btain at least 10

foot-degrees of Righting Energy.

  • Vessels must have at

least 15 degrees of heel until Downflood.

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Corrosion Background

  • Current corrosion Issues

– Exhaust tube corrosion – Buoy deck crack corrosion – Bilge Corrosion – Cavitation errosion corrosion – Stern Tube Corrosion – Slot weld corrosion

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Research Team

  • 3 current students

– One 1/C Cadet (Senior) – Two 2/C Cadets (Junior)

  • One from USCGA
  • One from USNA
  • Two professors from

chemistry, Dr Joshua Gray and LT Jody Maisano

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Experiments

  • Mass loss versus dimensional measurements of

corrosion

  • Corrosion rates versus salinity of water
  • Different commercially available coatings to

reduce the rate of corrosion

  • Different methods of simulating the bilge

environment (stir bars versus rotating tables)

  • Different inhibiters to reduce corrosion rate
  • Using sacrificial anodes inside the bilge
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Questions?

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Corrosion Acknowledgements

  • Dr Joshua Gray and LT Jody Maisano of USCGA
  • CAPT Paul Roden, CDR John Gage, Larry

Wilkerson, Mark Dust, Gary Peters, and John Kerns of the Coast Guard Surface Force Logistics Center

  • Dr. Glen Frysinger, LCDR Greg Hall, and Dr Todd

Taylor of the USCGA for their support of the project

  • Rich Grassia and NSWCCD Philadelphia for their

help and expertise