Midterm Presentation - Old Dominion University

Report
Joshua Laub
Jake Tynis
Lindsey Andrews
Advisor: Dr. Robert Ash
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Small, lightweight satellites
Size = 10 cm cube
(1 U up to 3U)
Total Mass < 1 kg
Orbital altitudes as great as 900
km (ISS is about 350 km)
CubeSat lifetime: ≈ 500 years
( 1000 yrs @ 900 km)
Velocities ≈ 7.4 km/s
NASA/IADC Guideline:
Orbital lifetime of 25 years or
less
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Develop a prototype inflatable device to deorbit
CubeSats
Increase frontal area >> Increase drag >> Decrease
orbital lifetime
Current Challenges:
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Folding/Packaging
Inflation Initiation
Material Procurement
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US Air Force Plug and Play prototype system
LabVIEW to trigger the inflation sequence:
Boolean program outputs about 1 Volt
 +1 Volt output is sent to relay
 Relay amplifies signal up to 30 Volts, if desired
 Amplified signal sent to Micro Solenoid valve to start air
flow (inflation)
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Mylar
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Kapton
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Resistant to punctures
Low cost
Vulnerable to radiation over long periods of time
Good mechanical properties
External chemical coating necessary to prevent atomic
oxygen degradation
Both will be utilized in the prototype development
Space-Qualified Design
Prototype
Material
2 Mil Mylar
Contact Cement
Gas Cylinder (from lab)
Lab air
Aluminum (from stock)
Valve (Clippard)
Circuit board
Misc.
Net cost:
Cost
$33
$10
$0
$0
$0
$48
$2
$15
$108
Material
Cost
Mass (g)
Upilex-S polyimide film (50µm)
$75
126
Elastosil S
$15
0.004
Aluminum 6061-T6
$15
2.13
SUVA-236fa refrigerant
unknown
1.77
Aluminum 6061-T6 (from stock)
$0
2.13
Upilex-S polyimide film (50µm)
included above
0.74
Dyneema
$3
0.075
Clippard
≥ $70 Around 11 g
Misc.
$15
Cost
Net mass (g)
$193
143.849
We have begun integration, headed towards full
system testing!
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Investigated different folding
methods in the lab
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Folding affects speed and
ease of inflation
Must consider decreased
frontal area due to bulges
Found that this is an area
requiring further refinement
STK software used for drag analysis
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Inputs: Orbital characteristics, frontal area
Outputs: Predicted orbital decay, orbital lifetime
EXAMPLE: Plausible CubeSat orbit and frontal area:
Eccentricity (0 to 0.004)
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Time Elapsed (Years 2004 – 2021)
Yellow: Height of Apogee
Red: Height of Perigee
Blue: Eccentricity
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Acquired Materials:
 Mylar
 Adhesive
Micro Solenoid Valve
 Gas cylinder
 Micro Solenoid Valve
 Relay
 Aluminum Deorbit Casing
 Steel “Cubesat”
Above: Deorbit Casing
Below: Mock CubeSat
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Have now acquired all parts; ready for lab simulation.
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Goal: Create deorbiting device for CubeSat
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Complete Lab simulation using:
 LabVIEW
 Remote Communication
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Challenges:
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Weight
Packaging
Folding
Signaling
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Bate, Roger R, Donald D Mueller and Jerry E White. Fundamentals of Astrodynamics. New York:
Dover Publications, Inc., 1971.
Bradford Engineering. "Sold Propellant Cool Gas Generator." 2006. <http://www.bradfordspace.com/pdf/be_datasheet_spcgg_sep2006.pdf>.
California Polytechnic, State University. "CubeSat Design Specification Rev.12."
Clippard Instrument Laboratory, Inc. www.Clippard.com. 2011.
D.C. Maessen, E.D. van Breukelen, B.T.C. Zandbergen, O.K. Bergsma. "Development of a Generic
Inflatable De-Orbit Device for CubeSats." (n.d.).
DuPont. "Summary of Properties for Kapton Polymide Films."
<http://www2.dupont.com/Kapton/en_US/assets/downloads/pdf/summaryofprop.pdf>.
IADC. "Space Debris Mitigation Guidelines." Standard. 2007.
Lokcu, Eser. "Design Considerations for CubeSat Inflatable Deorbit Devices in Low Earth Orbit."
Old Dominion University (2010).
McMaster Carr. 27 November 2010 <http://www.mcmaster.com/#aluminum/=a2cdo0>.
Office for Outer Space Affairs. "Space Debris Mitigation Guidelines of the Committee on the
Peaceful Uses of Outer Space." Vienna: United Nations, 2010.
Pumpkin, Inc. CubeSat Kit. 2008. <http://www.cubesatkit.com/>.
R. Janovsky, M. Kassebom, H. Lubberstedt, O. Romberg. END-OF-LIFE DE-ORBITING
Strategies for Satellites. Bremen: OHB System AG, 2002.
RobotShop. 30 November 2010 <http://www.robotshop.com/>.
Wacker Chemie AG. 1 December 2010 <http://www.wacker.com/cms/en/productsmarkets/trademarks/elastosil/elastosil.jsp>.
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Questions?

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