high strain composite deployable booms for cubesats
TRANSCRIPT
High Strain Composite Deployable Booms for Cubesats
Bruce Davis, Principal Engineer: SpaceDiego Arias, Principal Engineer: Thermal
500 S. Arthur Ave, Suite 300Louisville, Colorado 80027
13th Annual Cubesat Developers’ Workshop, April 22nd, 2016
ROCCOR Mission & Approach
Mission
• Reduce space asset cost with enabling and elegant satellite systems
Approach:
• Products: Incorporate low-cost emerging technologies– High Strain Composites (HSC) deployables
– Two-Phase Thermal Management
• Services: Advanced thermal, structures and composites engineering design & analysis
Example HSC Technologies
Composite Slit-tube booms Embedded Conductors
Roll-out Composite Truss Seam-Lock, (enhanced shear rigidity)
Defining High-Strain Composites
Wikipedia Page Created by Roccor AIAA HSC Technical Subcommittee• Created Jan 2014• Chair: Bruce Davis (Roccor)• Co-Chairs: Tom Murphey
(Roccor), Juan Mejia-Ariza (JPL)• High Profile Members:
• Sergio Pellegrino (CalTech)• Jeremy Banik (AFRL)• (Deployable Space Systems)• (LoadPath)
• Subcommittee objective:• Elevate the profile of high
strain composites as an enabler for high performance and low cost deployable structures
• Standardized requirements and design approaches
Example Slit-Tube Deployers
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Roccor’s Slit-Tube Deployer Family
Camera Boom
Microsat Boom
NovaWurks HIMast(DARPA Phoenix)
1.5U Cubesat Boom (NASA Magnetometer)
CubeSat Boom Deployer
Deployed Performance:
NASA Magnetometer Boom
• Volume: 1×1×1.5U
• Length: Up to 1.5m
• Mass: <1kg
• Low CTE Laminate
• Motor Driven
• Low Power Draw
• Magnetically Characterized
• Retractable
Stiffness @1m Strength @1m Precision
Axial > 8000 lb/in 90 lb +/- 0.002 in
Lateral > 2 lb/in > 0.5 lb +/- 0.050 in
Reached TRL 3, Q1 ‘16Expected TRL 6, Q4 ‘16
Emerging Product: TRAC BoomTM
Roccor is developing composite TRAC booms for cubesat applications
Partnering with NASA & AFRL
Flattened width comparable booms, TRAC boom has
Roccor-manufactured TRAC Booms
Metallic TRAC Booms Flown:LightSail 2015 & NanoSail D 2010
Two-Phase Flow Products
FlexCoolTM Thermal Straps
FlatCoolTM Heat Spreaders
SmartCoolTM Cold Plates
FlexCoolTM for CubeSats
FlatCoolTM for Laser Diodes and LEDs
Active cold plate for high heat flux applications
7 mm
Two-Phase Product Portfolio
Product Architecture EvaporatorHeat Flux
Length Rigidity Active / Passive
FlexCool Heat Straps <10 W/cm2 High Conformable Passive
FlatCool Heat Spreader >100 W/cm2 Low Rigid Passive
SmartCool Cold Plate >100 W/cm2 High Rigid Active
Enabling technologies:• Commercial-off-the-shelf materials• Different fluids for matching
operating temperatures• Advanced thermal analysis
capabilities• Scalable manufacturing methods• Surface treatments for improved
wicking and boiling
Copper Foil
Fine Copper Mesh (wick)
Coarse Copper Mesh
(vapor core)
Copper Foil
FlexCoolTM Heat Strap
• Thin, conformable heat strap
• Total thickness: < 1 mm
• Thermal conductivity: 3-5 times of copper
• Total mass: < half of copper equivalent
• Internal pressure carrying capability: > 135 psi
• Maximum length: ~30cm
Schematic of FlexCoolTM Integrated into CubeSat
Orbital Thermal Environmentsb = 72°
h = 350 km
ro = 0.35
Tearth = 300K
Tspace = 4K
torbit = 1.52 h
b = 0°
h = 1000 km
ro = 0.1
Tearth = 250 K
Tspace = 4 K
torbit = 1.75 h
b = 0°
h = 35,786 km
ro = 0.1
Tearth = 250 K
Tspace = 4 K
torbit = 24 h
HOT LEO
COLD LEO
GEO
DEEP SPACE Tspace = 4 K
Hengeveld, D., 2009, Hot- and Cold-Case Orbits for Robust Thermal Control, J. Spacecrafts and Rockets
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Thermal Model
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Component power [W]
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Strap Conductance [W/K]
Tmax
• Design chart for hot-bounding case:– Dependent on environment (orbital conditions) and overall geometry (board and
radiator)
– Any component above 5W would overheat without thermal strap
HOT LEO
Benefits
FlexCoolTM saves 66% in volume and 90% in weight of equivalent
copper strap
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FlexCool (3X kcopper)
For component temperature of 320K
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FlexCool (3X kcopper)
For component temperature of 320K
• Bruce Davis, Space Systems– [email protected]
– 315-256-1215
• Diego Arias, Thermal Systems– [email protected]
– 303-815-8583
• Will Francis, CTO– [email protected]
– 303-587-7467
Contact Us
Backup - Survey of CubeSat components
• Off-the-shelf components have reached 5W of power dissipation
• Candidate components include flight computers, communication equipment and power controllers
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Based on Cybesatshop.com, Tyvak.com, Andrews Space
MicroSat Boom