Colorado Space Grant Consortium
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Transcript of Colorado Space Grant Consortium
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Colorado Space Grant Consortium
Gateway To SpaceASEN / ASTR 2500
Class #25
T+3
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- Launch Recap
- Now What Do You Do?
- Announcements
- Guest Lecture – Spacecraft Structures
- Launch occurred 2 days ago – Yeah!
Today:
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Launch Recap:
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- Who didn’t get pictures?
- Who didn’t get any mission data?
- Who didn’t get any HOBO data?
- Who had a major failure during the flight?
- Who lost equipment/hardware?
- Who is happy?
- Who didn’t have a great time on Sunday?
Survey Says…
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So you now have launched
something into space…
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…now what are you going to do?
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Now What To Do:
- START working with your data (or lack of data)
- FULLY UNDERSTAND what happened and WHY
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Now What To Do:
- VERIFY FAILURES through testing
- WORK HARD to understand what the balloon flight told you
- DON’T PANIC – You can still get an A if you do the above well (Spider)
- HARDWARE turn-in is 12-06-11
- PREPARE your BalloonSat for re-flight (within reason)
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Space DebrisFinal Presentation
Cole Bostrom, Corey Godwin, Jonathon Kirchmaier, Emily Logan, Sean Murphy,
Seanna Renworth12-02-08
Rev D
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Design Overview
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Design Overview
Heater
Motor
CameraHB 25
Basic Stamp
HOBO
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Image Tests
• The imaging tests were successful in that the camera was able to focus on the mirrors. The window for the camera had to be enlarged so that it had a view of the bottom mirror. After this alteration the platform and camera worked together well.
Before Mod
After Mod
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System Testing: The Camera
• The camera was tested individually to test its ability to focus on the mirrors and take pictures at five different angles. These tests were successful.
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Now What To Do:
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Now What To Do:
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Now What To Do:
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Now What To Do:
- Have a PLAN for your final report and presentation(Presentation – 11-29-11 7:00 AM)(Report – 12-03-11, email & paper with signatures)
- DATA, CODE, and BEST 20 PICTURES due on CD on 12-01-11
- TEAM VIDEO due 12-03-11 (under 4 minutes and *.mov, *.wmv, *.mp4, *.mpg formats only)
- PREPARE for ITLL Design Expo (12-01-11)You must attend!
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Now What To Do:
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Now What To Do:
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Now What To Do:
- HW #7 (Due November 17, 2011 4:00 PM)
- THANK those that helped you (Tim May)
- ATTEND class- 11/10 Spacecraft Attitude Deter. & Control- 11/15 Satellite Tool Kit- 11/17 Spacecraft Communication- 11/29 Final Presentations #1- 12/01 Final Presentations #2- 12/06 Spacecraft Power and Career Advice- 12/08 Final Exam Review plus more- 12/14 Final Exam 4:30 to 7:00 PM
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Now What To Do:
- RE-FLY Forms due 12-08-11
- CONSIDER your future- Major change?- Space Grant HASP proposal due December 15th
> Spot on the team next semester> Possible paid position summer 2012> More details Thursday
- Space Grant Spring Open House JAN 19th, 2012
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Announcements:
- Don’t forget about community service by end of the semester
- Comments on DD C back next Thursday in class
- Website updated (presentation, LRR, DD C, pictures)
- EOSS Data on their website soon
- Maps, radios, coolers…
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Colorado Space Grant Consortium
Questions?
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Colorado Space Grant Consortium
Spacecraft Structures
Heather ReedLASP
Class #16 T-23
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Spacecraft Structures
Heather ReedMechanical Engineering Manager
Laboratory for Atmospheric and Space Structures
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What is a structure?
Why does a spacecraft need a structure?
PRIMARY or Secondary?
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55 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Lifecycle of a Structure
REQUIREMENTS(NEEDS)
DESIGN
ANALYSIS
BUILD
TEST
INTEGRATION
STUDENT NITRIC OXIDE EXPLORER (SNOE)
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56 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
REQUIREMENTS
• What does this spacecraft structure need to do?
• Accessibility• Lift points
– Vibe– Acoustic– Shock
» Thermal» Radiation
ROCKET LAUNCH
GROUNDTESTING
ON-ORBITCONDITIO
NS
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57 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
DESIGN – What shape will it be?
• SNOE was a “spinner”
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58 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
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
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59 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
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)
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60 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
SPACECRAFT
ROCKETNOSECONE
ROCKET SECONDARYSTAGE
DESIGN – Will it fit?
• Solid Modeling– Static or Dynamic
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61 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Solid Modeling - SolidWorks
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62 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
ANALYSIS - Modal Simulation Results
Mode 2 – 821 Hz – Mode shape plotRocking in the Y-direction
Mode 6 – 1270 Hz – Mode shape plotRocking in the X-direction
• 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:
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63 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
BUILDING IT – Your best laid plans
• Fabrication – Do 2 planes meet perfectly?
• Assembly – How clean is clean?
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64 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Why TEST?
• Vibration Testing• Thermal Vacuum Testing• Acoustic Testing• Shock Testing• Strength Testing• Spin Balance• Mass properties
NASA Goddard Gold Rules: • TEST AS YOU FLY, FLY AS YOU TEST
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65 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
TESTING – Vibration Testing
• Mass model testing – Good practice• Test sensors - Accelerometers
LARGE SPEAKER “VIBE TABLE”
AT BALL AEROSPACE
SNOE SPACECRAFT
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66 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Vibration Test Specification
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67 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
TESTING – Thermal Vacuum
• Less cooling 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
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68 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
INTEGRATION to the Pegasus
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69 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Secondary Structure – Solar Arrays
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70 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
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• Starting Program Management this week
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EUV on MAVEN going to Mars
Langmuir Probe and Waves (LPW) – LASP / SSL
LPW/Extreme Ultra-Violet (LPW-EUV) – LASP
LPW-EUV
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72 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
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
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73 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager
Aperture Mechanism Life Test Plan
-40
-20
0
20
40
60
Tem
p (degC
)
30V
22V30V36V
22V30V36V
22V30V36V
30V
200 Cycles
4280 Cycles
-5°C
-35°C
35°C
50°C