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Integrated Planning & Control of Large Tracked Vehicles in Open Terrain
Surya P. N. Singh
CDM-RG Seminar – February 24, 2010
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Big Picture View of Open-Pit Mining
Drill & Blast
LoadHaul
DumpShipRail
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Blasthole Drill: The Sharp End of Drill and Blast
• Drill Dynamic Considerations: • Large size (13m long, 15m high) & inertia (98 tones, ~3 kph)• Drill & drill mast vibrate (~50 cm)• Large hydraulic circuitry (300-500 psi, 850+ hp engine)• Complex terrain interaction (terrain plowing)
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Drilling Assistance Control:Leveling & Drilling
• Leveling• Estimation / filtering
needs to be done robustly due to vibration
• Drilling• Many DOF• Hybrid controls:
Collaring, drillingflush, and retrieve
• Various optimizationmetrics:
• Bit-life, drill time, etc.
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Architecture
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Non-Holonomic Motion Planning
Deterministic Methods
Path Sets(Trajectory Libraries)
Resolution complete
Tessellate a series of control actions
Sample-based Methods
RRT
Probabilistically complete
Sample states andbuild a graph between
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Non-Holonomic Motion Planning: Path Sets State Lattices
Deterministic Methods
Path Sets(Trajectory Libraries)
-10 -5 0 5 10
-5
0
5
(m)
(m)
-30 -20 -10 0 10 20 30-25
-20
-15
-10
-5
0
5
10
15
20
25
(m
(m)
Example: RTCMA Autonomous Drill Project
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Various Types of Path Sets
Green-Kelly HausdorffHopf
FibrationFull Tessellation
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Drill’s Path Set
-10 -5 0 5 10-8
-6
-4
-2
0
2
4
6
8
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Tessellate
-30 -20 -10 0 10 20 30
-20
-15
-10
-5
0
5
10
15
20
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Path End Straightening
-10 -5 0 5 10-8
-6
-4
-2
0
2
4
6
8
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Waypoint Control
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Positioning Results
ManualAutomatic
80 cm30 cm