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ECE/ME 491/2 Group 4 Winter 2009

ECE/ME 491/2 Group 4 Winter 2009. Benjamin Chen Suhail Gul Wai-Sze Lok Rob Merkle Brian Shaw Renee Soenen. Objective: To build an autonomous firefighting robot. Structural Design Considerations . Small or 0° turn radius Given size restriction and ground clearance Friction

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ECE/ME 491/2 Group 4 Winter 2009

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  1. ECE/ME 491/2 Group 4Winter 2009 Benjamin Chen SuhailGul Wai-SzeLok Rob Merkle Brian Shaw Renee Soenen

  2. Objective: To build an autonomous firefighting robot

  3. Structural Design Considerations • Small or 0° turn radius • Given size restriction and ground clearance • Friction • Type of drive-train • Weight and center of gravity location

  4. Wheels • First considered to determine range of chassis size to work with • Quantity and type which help with finalizing drive-train • Explored track style, multi-directional and standard hobbyist rubber wheels • Size to provide enough ground clearance

  5. Chassis and Drive-train • Shapes and sizes • Square, triangular and rectangular • Material • Lightweight and easy to machine • Deck quantity • Quantity, speed and torque of motors • Steering mechanism

  6. Chassis and Drive-trainCurrent Design • Chose optimal shape for best wheel configuration for design • Aluminum chassis • Two decks • Four modified servos to drive

  7. Possible Structural Issues • Amount of stress on shaft of servos • Possibly perform FEA to determine max stress • Clearance with face of wheels • Change wheels (last resort) • Vibration • Change thickness or material of chassis for more flexibility • Shock absorption on wheel (last resort)

  8. Rendered output of robot

  9. DC Motor vsModified Servo DC Motor: • Energy efficient • Powerful Modified Servo: • Excellent control of speed • Sufficient torque and speed in a compact unit • Internally geared

  10. Parameter on picking servo • Weight of the robot • Desired terrain • Desired velocity and acceleration • Voltage • Power consumption • controllability

  11. Robot Motor Factor (RMF)

  12. Fire Extinguishing Mechanism • Didn’t want to use air • Several different ideas • CO2 • System similar to a paintball gun • Paintball gun worked, but not feasible • Foam Spray • Small travel shaving cream can • Only shot a stream about 3 in.

  13. Fire Extinguishing Mechanism • Spray Bottle • Febreeze bottle, other press down bottle • Pump-spray system (current) • Windshield washer nozzles

  14. Fire Extinguishing Mechanism • Future work • Testing for volumetric flow rate and operating pressure • Buying misting nozzles • Testing • Range, operation time, etc.

  15. Constraints for electronic platform • Size • Power requirement • Processing ability • I/O options • Programmability

  16. Possible platform options • Motorola HCS12 based EVBplusMiniDragon+ or MiniDragon-Plus2 microcontroller • Xilinx Spartan3 based development board • Texas Instruments OMAP based GumstixOvero or Marvell PXA270 based GumstixVerdex Pro • ADI Blackfin based microcontroller • Intel Atom based D945GCLF development board

  17. Remaining Work Working on basic design requirements. Custom building parts required for the base. Working on basic design. Connecting the sensors and servos. Working on circuits and power requirement.

  18. PROGRAMMING • Working on programming servos • Working on programming microcontroller for connecting sensors. • Working on pathfinding algorithms

  19. Navigation First ideas for navigation: Strictly sensor-based travel. Specific behavior algorithms, such as straight-line and always-left-turn kind of algorithms. Knowledge of the house layout via a stored map.

  20. Navigation • The robots primary method of understanding the environment will be vision via a camera. • The camera-based vision system is complemented by an array of sensors for redundancy and verification purposes. • Implementing a vision-based system is more technically challenging than the previous ideas, but the benefits of vision are many.

  21. Original project timeline A tad too optimistic…

  22. Any Questions? • We won’t tell you too many details of our proprietary implementation…

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