THE KRAKEN. The Scuba Diving Wheel Chair TEAM 14: Phil Iatridis Jason MacNeil Mike MacIsaac Mohamed Abdelhady PROJECT SUPERVISOR: Dr.

Transcription

1 TEAM 14: THE KRAKEN The Scuba Diving Wheel Chair Phil Iatridis Jason MacNeil Mike MacIsaac Mohamed Abdelhady PROJECT SUPERVISOR: Dr. Ismet Ugursal 1

2 Project Background Project Goal: Scuba Diving with T1 level spinal injury Inspired by Sue Austin s design 2

3 Requirements Ascent rate of 60 feet per minute Be neutrally buoyant Diver s light mount Cruise at speed of 4 km/h Move forward, upward, downward, left, right 3

4 Requirements Stable on land Accommodate a standard aluminum 80 ft 3 tank Restraints withstand 30 kg buoyancy Return-to-off throttle 4

5 Further Requirements The Client shall be able to: Control with upper body in the seated position Access mask and regulators Release self from the chair in 5 seconds Be released by buddy in 5 seconds 5

6 Wish List Client get in/out with current level of independence Chair adjustable for divers of varying height Low level of diving training necessary Battery level indicator 6

7 Design Concepts Propulsion: Pump jet drive or trolling motor Propulsion Mounting: Under seat or on the wheels Propulsion Control: Electrical 7

8 Design Concepts Control Surfaces: Directional nozzle or flaps on wing Client Controls: Steering wheel or yoke 8

9 Design Concepts Client Restraints: Five point harness or three ring release Air Tank Mount: Behind seat or on the sides 9

10 Detailed Design Propulsion System Control Surfaces Client Controls Propulsion Controls Client Restraints Compressed Air Tank Mounting 10

11 Propulsion System Sea-Doo Supercharged VS Sea Scooter Top Speed: 4 km/h Maximum Depth: 30 m Weight: 8 kg 11

12 Control Surfaces - Stabilizing Wings Opposes roll forces Mounts propulsion system Rotates with wheel Filled with foam 12

13 Wing Mounting U-Bolt Removable Secured at top and bottom 13

14 Control Surfaces - Elevators Removable Control pitch 90 Range Filled with foam Bronze bushings 14

15 Client Controls Cable System Joystick neutral position adjustable 1/8-inch Aircraft cable Attached above and below pivot point on joysticks Cables fed through pulleys at the rear Can be removed 15

16 Client Controls Cable System Cables led from pulleys to elevators Looped around bolts in circular plate Plates bolted to shaft with L-brackets Cables tensioned using hose clamps 16

17 Propulsion Controls Bicycle brake lever Robust, mechanical Returns to off position 17

18 Propulsion Controls Bicycle brake cable fixed at both ends Hooked securely through trigger Re-used parts of wheelchair Easily installed and removed when wings detached 18

19 Client Restraints Over shoulder Crossed behind the back Lap belt Single release buckle Adjustable 19

20 Compressed Air Tank Mounting Half-hexagonal shape Tank secured using straps Valve accessible by client and buddy divers 20

21 Buoyancy Addition PVC pontoons and dive weights Added and removed during testing Used to balance chair in the water 21

22 Verification Ergonomics tested during construction Buoyancy of wings and elevators tested in tow-tank Weighed on scale in tow-tank lab Chair tested in Dalplex pool 22

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24 Verification Results Chair Frame: 21 kg Whole Assembly: 53 kg Top Speed: 0.5 m/s (2 km/h) Turning Speed: 5 s for 180 o (36 o /s) Thrust Force: 20 lb f (90 N) Ascent Rate: 0.3 m/s (60 ft/min) Self Release Time: 10s 24

25 Verification Results - Safety Requirement Category Must/Should Result Comments Access mask, regulators in and out of mouth Safety Must Pass Release self from chair while submerged in 5 seconds Safety Must Fail 10 seconds BCD and pony tank attached to diver Safety Must Pass Design facilitates an emergency ascent procedure Safety Must Pass 0.3 m/s Place to mount light Safety Must Fail Can add Chair is to be stable on ground when all equipment is attached Safety Must Pass Diver shall be secured in place Safety Must Pass Choice of securing full body or just lower body Safety Must Pass Can be released by others in case of emergency Safety Must Pass 25

26 Verification Results Requirement Category Must/Should Result Comments Control with upper body only Control Must Pass Cruising speed of 4 kph Propulsion Must Fail 0.5 m/s (1.8 kph) Move forward, up/down, left/right Propulsion Must Pass All parts neutral or slightly buoyant Spec Must Pass Buoyancy is controllable Spec Must Pass Diver able to wear BCD Spec Must Pass Controlled from sitting position Spec Must Pass 26

27 Verification Results Requirement Category Must/Should Result Comments Battery level indicator Spec Should Pass Diver can get in/out with "current independence level" Scooters beep when battery level is low Usability Should Pass Method developed Adjustable for diver height (5'0-6'6) Usability Should Pass Only low level training required Usability Should Pass 27

28 Design Improvements - Buoyancy Sliding weight mechanism Diver s Automatic BCD Chair BCD Diver s BCD line of action Moving scooters vertical line of action 28

29 Design Improvements - Construction Fibreglass or carbon fiber Hydrodynamic shape of wings and elevators Hand controlled joysticks New elevator position 29

30 Design Improvements - Other Equipment 6 ft air regulator hoses More powerful and reliable scooters Safety Feet straps New emergency release mechanism 30

31 Budget Category # of Items Total Project expense items matched budget proposal Scooters half-priced General over-estimation of costs Project ended with ~$850 surplus Controls 63 $155 Elevators 6 $35 Material 17 $315 Misc. 124 $270 Tank 2 $30 Scooters 1 $690 Total 213 $

32 Budget Number of Items per Category 2 1 Expense per Category 10% 2% Controls Elevators Material Misc. Tank Scooters 47% 18% 21% Controls Elevators Material Misc. Tank Scooters 2% 32

33 Recommendations Further design projects: Improving on the first prototype Design an alternate propulsion system 33

34 Acknowledgments Cher Smith Occupational Therapist (NS Rehabilitation Centre) Torpedo Ray s Scuba Adventures Staff Jason Weickert, Justin Miller, Deon Jones Joseph McNeil Rescue Diver and Technical Diving Support Angus MacPherson, Albert Murphy, Mark MacDonald, Justin MacDonald Dr. Clifton Johnston Dr. Georgetta Bauer Dr. Ismet Ugursal 34

35 Questions? 35