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Louise M c Gowan Ken Millard Kevin Pearce Daniel Rice

JAWSS. A Dalhousie Design Project Presentation Group 6 03 December, 2004. Louise M c Gowan Ken Millard Kevin Pearce Daniel Rice. Joint-service Active Watch Surveillance Submersible. JAWSS. Introduction. What is JAWSS?. What Does it Do?. Main Purpose?.

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Louise M c Gowan Ken Millard Kevin Pearce Daniel Rice

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  1. JAWSS A Dalhousie Design Project Presentation Group 6 03 December, 2004 Louise McGowan Ken Millard Kevin Pearce Daniel Rice Joint-service Active Watch Surveillance Submersible

  2. JAWSS Introduction What is JAWSS? What Does it Do? Main Purpose? Courtesy HMCS Iroquois

  3. JAWSS JAWSS • Inexpensive Construction • Ease of Use • Practical Application

  4. Design Requirements • Watertight • Buoyancy • Recovery Seaworthiness Displacement (total) = Displacement (hull) + Displacement (h. thrusters) + Displacement (dome) + Displacement (cage) – 60% Displacement (v. thrusters) 0.01386 m3 ----------- 13.81 kg (FW)14.2 kg (SW)

  5. Maneuverability • Speed • Degrees of freedom (DOF) • 3. Controlled by 1 person, tethered Fd = Cd * ½(ρV2A) Cd (cylinder) = 1.5 Cd (circular strut) = 1.2 V = 1.03 m/s (@ 2 knots) ρ = 1025.2 kg/m3 Initial Drag Estimates: 30 N

  6. Propellers Initial propeller designs were estimated using Gawn Data crossplots: BAR = 4(Ad)/Πd2 = 0.0005/d2 = 0.2 Kt/J2 = T/(ρd2V2) = 2 P/d = 0.51 Kt= 0.005 J2 /d2 J = 0.13 n = V * (30.88)/dJ = 11 402 rpm P = 0.0255 m d = 0.05 m n = 11 500 rpm Friction to Power ratio tests will be undertaken on 3 and 4 blade props. Courtesy PBS.com : NOVA

  7. Mission Effectiveness • View at 2ft distance • Video to controller with sufficient resolution • External DC power • Launched from ship’s boat Courtesy HMCS Iroquois

  8. “The prelude to action is the work of the Engine Room Department” Admiral Jellicoe, 1916

  9. Movement • 2 Vertical and 2 Horizontal Thrusters • 4 Degrees of Freedom

  10. DRAG • F=Cd*2**V^2*A • P=FV • Tether = 20W • Body = 13W

  11. Motors • 12 Volt motors • 1-4A • Based on drag testing Courtesy RadioShack.ca

  12. “A common mistake that people make when trying to design something completely foolproof was to underestimate the ingenuity of complete fools.” Douglas Adams

  13. Control Systems: Goals Initial goals: • Return video to surface • 3 Degrees of Freedom • Controllable by 1 person

  14. Control System: Brains Brains of the operation controls: • Motors x 4 • Camera Servos x 2 • Lighting • Sensors • Surface communications Delphinus Marine

  15. Control System: Controls Control Box includes: • Joystick control of thrusters • Joystick control of camera • Switch control for lights • LCD display for sensor data • Leak warning light • Video Output Delphinus Marine HVWTech.com

  16. Control System: Sensors Onboard sensors include: • Leak detection • Pressure (= depth) • External Temperature • Internal Temperature National Semiconductor Honeywell

  17. “For every action there is an equal and opposite government program.” Bob Wells

  18. JAWSS Power Supply Chosen: 12V DC Power supply • Weight of submersible reduced • Unlimited # of batteries • Power could originate from power inverter www..napaautoparts.ca

  19. Tether Design Components: • 2 CAT-5, 18 Gauge Power/Ground • Floats for neutral buoyancy • Wires shielded / watertight to reduce resistance losses Disadvantages: • Increased drag • Vertical load

  20. Camera Selection • 1st Test: Logitech webcam • 2nd Test: CCD Camera from security type camera • Chosen: PC169XS CCD camera due to its: • Low light visibility characteristics • Low Weight • Small size (1.5 sq in.) • Low current draw (110 mA ) SuperCircuits.com

  21. Camera Design • Pan / Tilt using servo motors (0.90x0.37x0.61in.; 5.4 grams) • Mounted on two platforms looking out through dome • Composite video sent back to controller via tether • Controls integrated into those of the submersible RobotShop.ca

  22. Lighting • 2 banks of white LED’s • Parallel to camera inside the dome • Lights Pan and Tilt with Camera • Placed to eliminate glare • Chosen: LED (0.3 Amps, watertight, 12V DC, illuminates 22.5” Dia circle at 2 feet) Global Plastics http://bosunsupplies.com/products

  23. Camera / Lighting Design Issue: Aberration Solution: • Camera lens perfectly centered • Placing lights parallel to camera

  24. The Way Ahead DRDC (Atlantic) Acoustic Barge • Construction • Testing • Assessment Courtesy DRDC (Atlantic)

  25. JAWSS Proud Supporters DRDC Atlantic Digi-Key, USA Alberta Printed Circuits DND: Fleet Maintenance Facility, Cape Scott Delphinus Marine Technologies Ancaster, ON, Canada

  26. JAWSS Conclusion • Situation • Mission • Execution • Service and Support • Command and Signals

  27. QUESTIONS ?

  28. Thank-You! Thank-You!

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