Mast Storage Rack NNSY

1. Mast Storage RackNNSY Sean Ellis, Philip Crist, Max Carpenter, Gershom Obeng

2. The Problem • Submarine masts are stored horizontally • Damage to O-rings • Uses excessive floor space • Inefficient process flow • Masts are failing upon reinstallation • Seals losing tolerances • Leak hydraulic fluid

3. The Solution • Design a rack to store mast vertically • Relieves pressure on O-rings • Small footprint • Better location

4. Mast Dimensions • Snorkel • 688 CLASS: 5” – D; 12’ 4” – L; 800-1000 Ibs • 726 CLASS: 12” – D; 14’ 6.5” – L; 3000 Ibs • Periscope • LIFTING: 2.5” – D; 16’ 7” – L • FAING: 5.25” – D; 11’ 8” – L • Radar • 2.5” – D; 5.375’ – L

5. Requirements • Hold numerous masts • Set of 8 per submarine • Accommodate various mast diameters • 3”-12” Diameters • Adjustable clamps to secure masts • Strong • Weight: 1,000 – 3,000 Ibs per mast • 10,000 Ibs Total

6. Design Base Vertical Truss Clamp

7. Base Design • I-beams bolted to floor supporting sheet metal base plate • Drain pan for residual oils • I-beams located directly under masts • Considered all joints welded • Simple hand calculations • Static, point forces • Compressive stresses

8. Base Calculations

9. Vertical Truss Design • I-beams welded to base, steel angles for bracing • Analyzed rack as if mast were tilted 5° • Clamp attaches to I-beams • Adjustable vertically • PATRAN/NASTRAN FEA model • Accurate stress/deflection results *Single section

10. Truss Calculations

11. Technical Drawing

12. Clamp Design • Modular design to allow for easy replacement • Adjustable along height of rack • “U-brackets” to attach on face of rack • Standard hardware items • Hand calculations for bolt strength

13. Clamp Calculations

14. Max Load Test Clamp

15. Technical Drawings

16. Cost Analysis (Welded)

17. Cost Analysis (Bolted)

18. Gantt Chart

19. Questions?