Louise McGowan Ken Millard

1
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
Introduction
What is JAWSS?
What Does it Do?
Main Purpose?
Courtesy HMCS Iroquois
3
JAWSS

• Inexpensive Construction
• Ease of Use
• Practical Application

4
Design Requirements

• Seaworthiness

• Watertight
• Buoyancy
• Recovery

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(?V2A) Cd (cylinder) 1.5 Cd
(circular strut) 1.2 V 1.03 m/s (_at_ 2
knots) ? 1025.2 kg/m3
Initial Drag Estimates 30 N
6
Propellers

• Initial propeller designs were estimated using
  Gawn Data crossplots

BAR 4(Ad)/?d2 0.0005/d2 0.2 Kt/J2
T/(?d2V2) 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 ships 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

• FCd2?V2A
• PFV
• 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 LEDs
• 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
Conclusion

• Situation
• Mission
• Execution
• Service and Support
• Command and Signals

27
QUESTIONS ?
28
Thank-You!
Thank-You!