a day in the life of groundhoggroundhog/publication/mobile...groundhog day 20-21 • “chassis in a...
TRANSCRIPT
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A Day in the Life of Groundhog
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Robotic Subterranean Mapping
MRD Fall 2002
The Robotics InstituteCarnegie Mellon University
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Introduction Day 1
• Goals of MRD– Mix with the events of our time– Change the world– Develop the technologies,
Robots, and Leaders of the Future
• Goals this year– Motivated by Quecreek– Build mine worthy robots– Map abandoned mines
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Declaration of Purpose Day 3
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Groundhog Day 12
• Class commits to Quecreek“Quick-Look”
• Quecreek Expected Conditions– 4’ high by 6’ wide by 4’ long breach
between the mines– Breach 1’ above mine floor– Wet, muddy conditions
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Groundhog Day 12
• Chassis– 2 Honda ATV front-ends
welded together– 4 wheel drive & steer– Components available by
cannibalizing an earlier robot
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Groundhog Day 20-21
• “Chassis in a Day” (or two)• “Design in a Day”
– Linked Ackerman steering – 8’ turning radius
– Golf cart drive train ~ 6 mph max– Originally designed to carry
Quantapoint laser scanner
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• Test at Bruceton Research Mine– Fully electric vehicle– Button box control– Wireless communications and
laser range tested
Groundhog Day 30
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Groundhog Day 36
• Access denied due to safety concerns
• Retrofit to Hydraulics and explosion proof enclosure is undertaken
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Groundhog Day 43
• Groundhog total mass roughly doubles, requiring additional structural support
• Electronics and computer control are integrated into the explosion-proof box
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Groundhog Day 54
• CMU Highbay Trials– Surmounting Obstacles– Fiber Tether– Wireless Slip-Ring
First Successful 2D and 3D mapmaking
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Groundhog Day 54
X – You Are Here
The Highbay
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Groundhog Day 63
• Florence Mine, Burgettstown, PA– First robotic mapping of an abandoned mine
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Groundhog Day 63
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Groundhog Day 63
The Limiting Factors
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Groundhog Day 65
• Live satellite feed to MSHA Symposium
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Groundhog Day 65
• That evening on the news…
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Groundhog Day 93
• Extensive Mapping of Bruceton Mine– Robot Range and Endurance
• >1 mile traverse in 3.5 hrs (28.5 ft/min)– Largest data set to date.
• 300+ MB of laser data
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Groundhog Day 93
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Groundhog Day 106
• We can take a couple of questions now…
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THE FERRET
Borehole deployable laser scanner for 3D mapping, map verification, and void analysis
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Ferret: The General Concept
• Laser Range Finder• PTU• Fit in 6” Borehole
Concept
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Ferret I
• Point Laser Range Finder
• PTU • 4” PVC encasing• Dual Serial
Communication• Command Driven
Interface
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Experimentation
• Denied Access• Limited Laser Range• Mellon Institute
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Mellon Institute Results
Mellon Institute Void
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The End of Ferret?
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Problems in Kansas City
• Kansas City Limestone Mines
• Weak Ceiling Integrity results in Domeouts
• Prohibit Development
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How do they verify backfill?
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Ferret II Hardware Design• Long Range – Low
Reflectivity Laser• Pan & Tilt Unit• Embedded
Microprocessor• Magnetic Compass• Inclination Sensors• Video Camera & Lights• Proximity Sensors• Deployment Device
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Ferret II Software Design• Breach Recognition• Scanning Control• Data Acquisition• Data Processing
– Filtering– 3D realization– Dimension and Volumetric Analysis
• Map Correlation• User Control Interface
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Ferret II
Ferret Components
Ferret In Testing Configuration Ferret Before 1st Deployment
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Ferret II in Kansas City• Deployed down 3
boreholes• Borehole depth typically
150 ft• Performed 9hrs of
operation in 24 hrs• Operated 4 hrs on single
battery charge
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Kansas City Preliminary Results
Hole M8 - Water/Air Mix
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Kansas City Preliminary Results
Hole M5 - Domeout
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Visual Confirmation
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That’s Not All For Ferret, But…
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Ferret Questions?
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Business
• Idan will talk about the business plan…
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Registering A Map
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MagellanBorehole-Deployable Subterranean Rover
Preliminary Design
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Concept Image
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MechanicalSpecifications
• 2 segment 4 wheeled rover
• Solid drive axles• Steering via actuated
center link• Inflatable wheels• Single purged and pressurized volume• Deployable sensor payload• Docking mechanism• Compact deployment configuration
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ElectricalSpecifications
• Locomotion and Actuation Motors (24VDC)– Front Drive– Rear Drive– Pneumatic Pump
• Sensing– Sonar and Laser Scanner
• Computing– PC/104+ form factor– Opportunistic Wireless Ethernet– Data logging
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External Sensor LayoutMajor Subsystems
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High Level Software
• Mapping and Navigation – Preprocess prior maps to plan mine traverse.– Perimeter traverses– Sector traverses
Specifications
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NavigationSpecifications
• Navigation– Node to Node Transition– Feature Identification: Corridor and Crosscut
• Wall Centering and Obstacle Avoidance
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Base StationMajor Subsystems
• Borehole anchoring mechanism
• Tether to surface• Video• Compass• Wireless Ethernet• Detachable Snorkel• Purged and pressurized
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Inflatable WheelsMajor Subsystems
• Sphere and torus shaped internal pressure volume
• Enclosed in wheel sleeve– Stability/traction– Abrasion resistance
• Central pump drives independent wheel circuits
• Wheels inflated in mine– Air supplied by base station via detachable snorkel
• Wheels are vacuum deflated for recovery– Extra air is vented to mine
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Docking Mechanism
• Passive hook and catch mechanism– disengages when robot is level– engaged by driving catch into hook
Major Subsystems
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Docking MechanismMajor Subsystems
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Docking MechanismMajor Subsystems
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Docking MechanismMajor Subsystems
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Performance GoalsOperations
• < 70 lbs final mass• > 1 mph top speed• < 200 W average power consumption
– 2.5 mile maximum straight line travel– 2 mile maximum safe straight line travel– .5 mile radius maximum circular traverse
• > 50 deployments MTBF• < $20K• < 2 Person field team
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Questions
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Visions for the Future• 16-865/18-775: Advanced
Mobile Robot Development
• BuoyBot for partially submerged mines.
• Magellan to be Developed Spring 2003
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Future of Subterranean Robotics• Technologies to be Developed
– Amphibious and Swimming Robots– Miniaturization and Borehole Deployment– Specialized Sensors for Subsurface– Autonomy
• Applications– Mine Mapping Services– Commercial Contacts– Monitoring Nuclear Storage Caverns– DoD operations in Caves Bunkers Aqueducts and Sewers
• Seeds for Enterprise– Disclosures Matured to Patents– Seeking Paid Applications
• Resources to Enable the Future– Line Item Earmark for Spring 2003– Proposal Portfolio in Preparation– Seeking Alliances