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Purdue University Project Chaffee Critical Design Review Launch - - PowerPoint PPT Presentation
Purdue University Project Chaffee Critical Design Review Launch - - PowerPoint PPT Presentation
Purdue University Project Chaffee Critical Design Review Launch Vehicle Vehicle Dimensions Length: Diameter: 3 Wall Thickness: 0.057 Fin Thickness: 0.125 Weight (loaded): 22 lbs. Weight (unloaded): 20.5
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SLIDE 3
Vehicle Dimensions
- Length:
- Diameter: 3”
- Wall Thickness: 0.057”
- Fin Thickness: 0.125”
- Weight (loaded): 22 lbs.
- Weight (unloaded): 20.5 lbs.
SLIDE 4
Vehicle Materials
- Filament-wound fiberglass: Airframe; coupler tubes
- G10 fiberglass: Fins; bulkheads; centering rings
- Kevlar: Shock cord
- Nylon: Parachutes
- Epoxy: Adhesive for fixed joints
- Stainless steel: Recovery hardware (eyebolts, quick links, etc.)
- 6061 Aluminum: Motor retainer
- ABS: Custom-printed parts (avionics sled, payload mounting, etc.)
SLIDE 5
Flight Simulation
SLIDE 6
Stability Analysis
- Center of Pressure:
- Center of Gravity:
- Static Stability Margin:
- Minimum Dynamic Stability:
- Launch Rail Clearance Velocity:
SLIDE 7
Motor Data
- Designation: Aerotech K828FJ
- Maximum Thrust: 1303.8 N
- Average Thrust: 862.9 N
- Burn Time: 2.5 s
- Total Impulse: 2157.2 Ns
- Thrust/Weight Ratio: 8.8
SLIDE 8
Recovery
- 2 redundant altimeters
- Primary Altimeter
- Featherweight Raven
- Secondary Altimeter
- Missile Works RRC3
- Drogue Parachute Deployment
- Apogee
- Main Parachute Deployment
- 700 Feet
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Recovery cont.
- Main Parachute
- 60” Sky Angle
- Drogue Parachute
- 24” Sky Angle
- Shock Cord
- 5/16” Tubular Nylon
SLIDE 10
Kinetic Energy and Drift Analysis
SLIDE 11
Payload Design
Closed Loop PID controller that has multiple filters to help create accurate results
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Control Theory
Theta dot- roll rate V infinity- Velocity Phi- Fin Deflection (s+a/(s+b))- compensator TF- actuator transfer function 1/s-integration
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Physical Mechanism
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Physical Mechanism
SLIDE 15
Parts List
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Payload Testing
- Hard Code Test
- Torque Testing
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Computing and Sensors
- Arduino Pi
- processing
- Adafruit Flora 9-DOF
- Orientation, velocity, gyroscope
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Safety
- Construction Safety
○ Use appropriate PPE, and obey all university lab procedures
- Failure Modes
○ Addressed through verification plan (see next slide) ○ Many prevented through material selection
- Launch checklists to ensure safety
SLIDE 19
Verification Plan
- Payload Verification
○ During construction and before launch
- Vehicle Verification
○ During construction and before full-scale test flight
- Pre-Flight Verification
○ To take place before every flight
SLIDE 20
Launch Operations
- Launch checklists to be used before all flights
○ Hotel Procedures - Verify functionality ○ Prep Table Procedures - Secure all components ○ Pad Procedures - Arm all electronics ○ Launch Area Procedures - Assure personnel safety
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Subscale Test Flight
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SLIDE 23
Subscale
- 320 feet.
- Canted fins had noticeable but smooth effect.
- Landed safely
- Noticed bad “weathercock”
○ Design change
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Interfaces
- Navigation
○ Eggfinder GPS transmitter/receiver ○ 900 MHz frequency range
- Igniters
○ Ensure proper installation before flight
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