Transcript Cubesat
Joshua Laub Jake Tynis Lindsey Andrews Advisor: Dr. Robert Ash Small, lightweight satellites Orbital energies as high as 29 MJ! NASA/IADC (UN) Guideline: Orbital lifetime of 25 years or less Our Objective: Demonstrate proof of concept deorbiting device using inflation We have designed and fabricated the inflatable container Sourced materials for constructing a flight ready prototype Procured the necessary individual components to assemble a proof of concept prototype Analyzed the orbit with STK orbital software to confirm the inflatable size necessary Conducted inflation tests to develop an effective folding technique Further testing of the integrated product requires a simulation of the rupturing membrane Must provide temporary rigidity to restrain stowed inflatable, while allow access to inflation port Must also cleanly tear and not restrict inflation 10 cm 4 cm Conducted in the Physics Instrumentation Lab Remote control valve actuation More accurately simulates the actual initiation method On orbit initiation would be triggered from the main CubeSat bus Vacuum chamber Physics Department vacuum chamber is currently undergoing a retrofit This will allow for vacuum testing in pressures as low as less than 1 millibar (Patm = 1013.5 millibar) Additionally, this vacuum chamber can be utilized by the Physics Department for various other student projects Prototype Space-Qualified Design Material Cost Material 2 Mil Mylar $60 Upilex-S polyimide film (50µm) $75 126 Contact Cement $10 Elastosil S $15 0.004 Gas Cylinder (from lab) $0 Aluminum 6061-T6 $15 2.13 Lab air $0 SUVA-236fa refrigerant unknown 1.77 Aluminum (from stock) $0 Aluminum 6061-T6 (from stock) $0 2.13 Valve (Clippard) $48 Upilex-S polyimide film (50µm) incl. above 0.74 Circuit board $5 Dyneema $3 0.075 Clippard ≥ $70 Around 11 g Misc. $15 Cost Net mass (g) $193 143.849 Vacuum Chamber (Testing) $0 Microcontroller (Testing) $90 Misc. $20 Net cost: $233 Cost Mass (g) We had projected we would complete the project 4/21/2011 The final test was conducted 4/20/2011 ( ! ) Investigation of different folding methods Low pressure deployments Folding affects speed and ease of inflation Accurately simulate operational environment Elaborate on the influence of pressure on membrane rupture Scaling down of valve Development of custom fabricated inflatable Refinement of rupturing membrane Goals were met Extras Remote valve actuation Vacuum chamber for future testing Challenges remain Packaging Custom inflatable Scaling down of valve 1. California Polytechnic, State University. CubeSat Design Specification Rev.12. 2. Pumpkin, Inc. CubeSat Kit. [Online] 2008. http://www.cubesatkit.com/. 3. R. Janovsky, M. Kassebom, H. Lubberstedt, O. Romberg. END-OF-LIFE DE-ORBITING Strategies for Satellites. Bremen : OHB System AG, 2002. 4. Space Debris Mitigation Guidelines of the Committee on the Peaceful Uses of Outer Space. Office for Outer Space Affairs. Vienna : United Nations, 2010. 5. IADC. Space Debris Mitigation Guidelines. s.l. : IADC, 2007. Standard. 6. Development of a Generic Inflatable De-Orbit Device for CubeSats. D.C. Maessen, E.D. van Breukelen, B.T.C. Zandbergen, O.K. Bergsma. 7. Design Considerations for CubeSat Inflatable Deorbit Devices in Low Earth Orbit. Lokcu, Eser. 2010, Old Dominion University. 8. DuPont. Summary of Properties for Kapton Polymide Films. [Online] http://www2.dupont.com/Kapton/en_US/assets/downloads/pdf/summaryofprop.pdf. 9. Bradford Engineering. Sold Propellant Cool Gas Generator. [Online] 2006. http://www.bradfordspace.com/pdf/be_datasheet_spcgg_sep2006.pdf. 10. Clippard Instrument Laboratory, Inc. www.Clippard.com. [Online] 2011. 11. Bate, Roger R, Mueller, Donald D and White, Jerry E. Fundamentals of Astrodynamics. New York : Dover Publications, Inc., 1971. 12. Chattopadhyay, Somnath. Pressure Vessels: Design and Practice. Boca Raton : CRC, 2005. 13. Wacker Chemie AG. [Online] [Cited: December 1, 2010.] http://www.wacker.com/cms/en/productsmarkets/trademarks/elastosil/elastosil.jsp. 14. RobotShop. [Online] [Cited: November 30, 2010.] http://www.robotshop.com/. 15. McMaster Carr. [Online] [Cited: November 27, 2010.] http://www.mcmaster.com/#aluminum/=a2cdo0. Questions?