symposium presentation - university of colorado boulder · symposium presentation feathercraft...
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Symposium Presentation
FeatherCraft Integrated Structural Housing &
Computer, Hardware Interface Processing Suite
Team: Larry Burkey, Jorge Cervantes, Lewis Gillis, Evan Graser, Megan Howard, Andrei Iskra, Taylor Maurer, Davis Peterson, Maggie Williams
Customer: Michael Brown Advisor: Joe Tanner
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OVERVIEW 2
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Project Motivation: Commercialization of International Space
Station provides a launch opportunity not only to cubesats but larger 100 kg spacecraft
Spacecraft are launched on ISS cargo resupply missions, allowing for internal soft-stowed configuration and less stress on structure in launch environment
Surrey Satellite Technology US plans to offer the FeatherCraft system as a cost-effective platform for payloads of 45 kg or less.
Surrey’s FeatherCraft Illustration
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Project Statement:
The 5 kg FeatherCraft structure shall provide support for a 100 kg total mass commercial spacecraft with
reduced structural manufacturing time and materials cost, and enable the spacecraft to survive launch to
and deployment from the ISS.
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3. Final assembly & integration with
avionics and other bus components
4. Integrate with payload and ISS resupply vessel 5. Launch to ISS
6. Interface with the Kaber Deployment System and deploy
from the JEM airlock
7. Possible Orbit Raising Maneuver and 5 year
mission lifetime
CON OPS: 1. Design structure to meet
all requirements, manufacture STM, design
and create DAQ system
2. Perform vibration test and analyze
accelerometer data
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ISS Launch Configuration:
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1” thick Pyrell Foam
Foam Wrap Reduces
Vibration Loads
Structure
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STRUCTURE 7
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Design Evolution:
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Composite Panels
Light-Weighted
Skeleton Structure Light-weighted composite panels with internal columns for stiffness
Weight relief radii optimized to reduce stress
concentrations
Final Design: Preliminary Design:
Initial Concepts:
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Structural Test Model (STM):
Required Mass: < 5 kg
Predicted Mass: 4.48 kg
Actual Mass: 4.16 kg
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Carbon fiber with aluminum honeycomb sandwich panels
Four carbon fiber columns bolted on two sides creates the frame
Panels adhered with space-grade epoxy 2 weeks of assembly (~100 man-hours)
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Modeling - ANSYS:
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Material Stress Locations Under Load
Developed for panel survival and design
Two models developed o One designed for an arbitrary payload
o One for detailed predictions of test model
Two analysis cases o Will structure survive launch vibration loads?
o What are its natural modes?
Example Mode
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Modeling - ANSYS:
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Developed for panel survival and design
Two models developed o One designed for an arbitrary payload
o One for detailed predictions of test model
Two analysis cases o Will structure survive launch vibration loads?
o What are its natural modes?
Design Margin: 55% above 1.9 FOS
Example Mode
Material Stress Locations Under Load
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Testing:
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STM SURVIVED!
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Results: Z-Axis (Most Critical)
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Mode 1:
57 Hz
Error: 11%
Mode 2-3:
130 Hz
Error: 8%
Mode 9:
300 Hz
Error: 11%
Mode 4,7:
152, 160 Hz
Predicted Mode
Pre-Random Modal Sweep
Post-Random Modal Sweep
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DAQ 14
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DAQ Hardware FBD:
PC with Windows OS (not delivered)
Digital
Analog
Power
Software
Acquired
Designed
5V
Micro- Controller
Board
Parallel Bit Data Bus
5V
5V
USB Drive with DAQ Software
Accel Channels
(At least 8 channels)
Data Acquisition Boards (8 Channels per Board)
Signal Conditioning (one per acc
channel)
S/H ADCs (one 8-input
ADC per 8 acc channels)
120VAC 60 Hz (wall outlet)
Switch
Power Supply
24V
>4 kHz sampling
frequency
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Functional Not Functional
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CONCLUSION 16
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Conclusion:
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Improvements:
Improve structure for space environment
o Thermal subsystem
o Vacuum testing
Reduce manufacturing/assembly time of structure
o Reduce part count
o Streamline adhesive process
o Minimize panel mass to a lower margin
Consider other options for DAQ to decrease manufacturing complexity
The FeatherCraft structure design meets all customer requirements and has TRL value of 4-5
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Acknowledgements:
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