Colorado Space Grant Consortium

Gateway To SpaceASEN / ASTR 2500

Class #25

T+3

- 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:

- 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…

So you now have launched

something into space…

…now what are you going to do?

Now What To Do:

- START working with your data (or lack of data)

- FULLY UNDERSTAND what happened and WHY

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)

Space DebrisFinal Presentation

Cole Bostrom, Corey Godwin, Jonathon Kirchmaier, Emily Logan, Sean Murphy,

Seanna Renworth12-02-08

Rev D

Design Overview

Design Overview

Heater

Motor

CameraHB 25

Basic Stamp

HOBO

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

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.

Now What To Do:

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- 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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- 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

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

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…

Colorado Space Grant Consortium

Questions?

Colorado Space Grant Consortium

Spacecraft Structures

Heather ReedLASP

Class #16 T-23

Spacecraft Structures

Heather ReedMechanical Engineering Manager

Laboratory for Atmospheric and Space Structures

reed@lasp.colorado.edu

What is a structure?

Why does a spacecraft need a structure?

PRIMARY or Secondary?

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)

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

57 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

DESIGN – What shape will it be?

• SNOE was a “spinner”

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

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)

60 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

SPACECRAFT

ROCKETNOSECONE

ROCKET SECONDARYSTAGE

DESIGN – Will it fit?

• Solid Modeling– Static or Dynamic

61 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

Solid Modeling - SolidWorks

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:

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?

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

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

66 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

Vibration Test Specification

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

68 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

INTEGRATION to the Pegasus

69 Nov 8th, 2011 Spacecraft Structures Heather Reed, ME Manager

Secondary Structure – Solar Arrays

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

EUV on MAVEN going to Mars

Langmuir Probe and Waves (LPW) – LASP / SSL

LPW/Extreme Ultra-Violet (LPW-EUV) – LASP

LPW-EUV

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

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