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Colorado Space Grant Consortium

Gateway To Space ASEN 1400 / ASTR 2500 Class #24. T -16. Colorado Space Grant Consortium. Today:. Announcements - Guest Lecture – Spacecraft Structures Launch is in 16 days. Announcements…. Propulsion Talk… - What did you think? Design Document Rev C - Due 11-16-2012 at 12 PM

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Colorado Space Grant Consortium

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  1. Gateway To Space ASEN 1400 / ASTR 2500 Class #24 T-16 Colorado Space Grant Consortium

  2. Today: • Announcements • - Guest Lecture – Spacecraft Structures • Launch is in 16 days

  3. Announcements… Propulsion Talk… - What did you think? Design Document Rev C - Due 11-16-2012 at 12 PM Launch Readiness Review - Due 11-27-2012 at 7 AM - Presentation order… > 8, 6, 7, 3, 5, 1, 2, and 4 - Template on the website

  4. Test Results (3 minutes) • Prove your project is ready for flight • Heart of your presentation • Show test data (graphs, charts, etc) that are labeled, with key events indicated • Structural tests should be included but equal time should be devoted to mission/science tests (present mission/science test first) • Proof should be shown that you have actually recorded, off-loaded, and analyzed your data

  5. Announcements… Ready for Flight Cards - Don’t lose this only copy - Must turn in on 11/30 - Use as a checklist - Follow it exactly - Not fully completed, your team doesn’t fly

  6. Tuesday 11/27… LRR Presentations Presentations due 7:00 AM 4 days to launch Colorado Space Grant Consortium

  7. Thursday 11/29… Launch Logistics Friday meeting time sign up 2 days to launch Colorado Space Grant Consortium

  8. Friday 11/30… BalloonSat Turn in RFF Cards Turn in 30 minute turn in times Completed by 3:00 PM 1 day to launch Colorado Space Grant Consortium

  9. Saturday 12/01… Launch! Leave Boulder at 4:45 AM Arrive ~5:45 AM Colorado Space Grant Consortium

  10. Mission Simulations ASEN 1400 / ASTR 2500 Class #24 T-16 Colorado Space Grant Consortium

  11. Payload Handlers: • - Bring you payload to the front of the class • - Tell us about • - Demo something with it • - Let them run for until ~10:35

  12. Spacecraft Structures Heather Reed LASP (Laboratory of Atmospheric and Space Physics) Colorado Space Grant Consortium

  13. Spacecraft Structures Heather Reed Mechanical Engineering Manager Laboratory for Atmospheric and Space Structures reed@lasp.colorado.edu

  14. What is a structure? Why does a spacecraft need a structure? PRIMARY or Secondary?

  15. Lifecycle of a Structure REQUIREMENTS (NEEDS) DESIGN ANALYSIS BUILD TEST INTEGRATION STUDENT NITRIC OXIDE EXPLORER (SNOE)

  16. REQUIREMENTS • What does this spacecraft structure need to do? • Accessability • Lift points • Vibe • Acoustic • Shock • Thermal • Radiation ON-ORBIT CONDITIONS ROCKET LAUNCH GROUND TESTING

  17. DESIGN – What shape will it be? • SNOE was a “spinner”

  18. DESIGN – What will it be made out of? • Materials selection • Stiffness vs. Strength • Car suspension – STRONG CAR, weak connection to the road • WEIGHT  CHEAPEST RIDE TO SPACE = $35,000 per lb • Cleanliness • Specific plastics only • Materials that can be scrubbed • Aluminum is a great material

  19. DESIGN – How will it be built? • Manufacturability • Strongest structure is all one piece • How easy is it to assemble? • Primary structure $$ < 1% of SNOE mission budget ($8M)

  20. DESIGN – Will it fit? • Solid Modeling SPACECRAFT ROCKET NOSECONE ROCKET SECONDARY STAGE

  21. Solid Modeling - SolidWorks

  22. ANALYSIS - Modal Simulation Results • 821 Hz: First predicted high mass participation mode. • 741 Hz: Lowest frequency mode is a local connector bracket mode. • Z-axis has very little mass participation below 2000 Hz. • Two principal mode shapes shown below: Mode 2 – 821 Hz – Mode shape plot Rocking in the Y-direction Mode 6 – 1270 Hz – Mode shape plot Rocking in the X-direction

  23. BUILDING IT – Your best laid plans • Fabrication – Do 2 planes meet perfectly?

  24. Why TEST? • Vibration Testing • Thermal Vacuum Testing • Acoustic Testing • Shock Testing • Strength Testing NASA Goddard Gold Rules: • TEST AS YOU FLY, FLY AS YOU TEST

  25. TESTING – Vibration Testing • Mass model testing – Good practice • Test sensors - Accelerometers SNOE SPACECRAFT LARGE SPEAKER “VIBE TABLE” AT BALL AEROSPACE

  26. TESTING – Thermal Vacuum • More heat without air – Electronics • Thermal expansion – Causing binding • More friction without air – Moving parts • HOT/COLD Operational and Survival limits SNOE SPACECRAFT LARGE TANK “RAMBO” AT BALL AEROSPACE

  27. INTEGRATION to the Pegasus

  28. Secondary Structure – Solar Arrays

  29. Heather Reed, CU Mechanical Eng 97’ • Work during Undergrad studies, BS ME in 1995 • Space Grant College • NIST, NDE lab • CU football & basketball security • Hart Ranch snack shop • Work during Grad studies on SNOE, MS ME in 1997 • FEA, Solar panel substrate, Nutation damper, Torque rods, Thermal blankets • Employed at LASP after graduation • ME Manager in 2001, 8 ME’s then, 23 ME’s now • Current program is MAVEN, mission to MARS • Program Management on grants

  30. The PF Package LPW-EUV Langmuir Probe and Waves (LPW) – LASP / SSL LPW/Extreme Ultra-Violet (LPW-EUV) – LASP

  31. Testing • Engineering Unit testing • Mechanism Life Testing – Vibe, Life Test cycling • Luxel filter qualification – Vibe, thermal cycles • Light leak testing • Torque margins • Spring force • Magnetic field • Flight Unit testing • Vibe test • Random Vibe, response limit • Strength verification = ? • Mechanism Run-in • Torque margins • Spring force • Light leak testing

  32. 22V 30V 36V 30V 4280 Cycles 22V 30V 36V 30V -5°C -35°C 35°C 50°C 200 Cycles 22V 30V 36V Aperture Mechanism Life Test Plan

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