1. Artur Koop, Thomas Ruck, Karl Dietmann, Maria Grulich
REXUS 18
SMARD
Shape Memory Alloy Reusable Deployment Mechanism
Hello -> Team SMARD
Vorstellung:
Philipp -> Struktur
Johannes -> Elektronik
Ingo -> Software
Alex -> Software
Artur Koop, Thomas Ruck, Karl Dietmann, Maria Grulich

2. Team - SMARD New team picture taken at our university 10.09.2014
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3. Mission Statement
Develop and verify a solar panel hold down release mechanism for a CubeSat using Shape Memory Alloys on REXUS 18.
Mission Statement -> vorlesen
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4. Table of Contents Current Status of the Experiment Mechanical Design
Electronic Design
Software Design
Auxiliary Project Information
Financial Budget
Test Plan
Outreach
Table of contents for today
Experiment Setup
Auxilary Information
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5. Current Status of the Experiment Mechanical Design Electronic Design
Software Design
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6. 1.1 Mechanical Design: Current State Overview
Frame and ERIS housing partly manufactured and assembled
Bulkhead, hinges, solar panel parts manufactured, bulkhead needs slight adaptation (mounting holes)
Most small parts, e. g. screws and springs, delivered
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7. 1.1 Mechanical Design: New FEM Simulation
Following CDR comments, a new FEM analysis of the experiment was performed
Under qualification level dynamic load conditions, high deformation (>2.5 mm) of the experiment frame was discovered at resonance
2.5 mm
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8. 1.1 Mechanical Design: Frame Stiffening
Measures for preventing frame deformation:
Redesign of back plate for higher stiffness
Additional stiffening beam
Still needs to be proven by new simulation or test
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9. 1.1 Mechanical Design: New Flight-Ready HDRM
Return to modified version of older design with steel bias spring pulling against SMA spring
New features: Pretensioning of bias spring prevents accidental opening by vibration, moving cable connection eliminated
Optional goal: Further minimization to half size in order to save space and weight for cubesat application
=> Prototype built and successfully tested
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10. 1.1 Mechanical Design: Summary Of Future Work
Parts still needing to be manufactured: Final HDRM for flight, camera housing, new back plate, stiffening beam
Items with considerable lead times not yet delivered: Final SMA spring for flight
Minor modifications required on several components, e. g. solar panel and hinges for return to bolted connection after adhesives proved too difficult
=> Structure team is on track for experiment completion in October
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11. Current Status of the Experiment Mechanical Design Electronic Design
Software Design
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12. 1.2 Electronic Design: Introduction
Tasks
RS-422 (Up-/Downlink) + RX/SM Interfacing
SMA Activation + Measurement
Power Suppy for experiment
Sensor Interfacing (ACC, Temperature, Angle)
Camera Activation + LEDs
 Electrical connection to ERIS (sbRIO)
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13. 1.2 RS-422 isolation
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14. 1.2 Electronic Design: Prototype Status
Installation of prototypes (Breadboard, free wires)
For functional testing
Development of prototypes before final PCB  enabeling testing for Software Team
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15. 1.2 Electronic Design: Prototype Status
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16. 1.2 Electronic Design: ERIS (sbRIO) + Breakoutboard
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17. 1.2 Electronic Design: RX/SM RS-422 Emulation
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18. 1.2 Electronic Design: RX/SM Signal (SODS, LO, SOE)
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19. 1.2 Electronic Design: Magnetsensor
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20. 1.2 Electronic Design: Camera / GoPro Interface
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21. 1.2 Electronic Design: Accelerometer
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22. 1.2 Electronic Design: ADC (SMA-Measurement), SPI
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23. 1.2 Electronic Design: SMA Activation (Buck-Converter)
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24. 1.2 Electronic Design: PSIB2
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25. 1.2 Electronic Design: PSIB2√
1.2 Electronic Design: PSIB2
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26. 1.2 Electronic Design: PSIB1
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27. 1.2 Electronic Design: PSIB1√
1.2 Electronic Design: PSIB1
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28. Current Status of the Experiment Mechanical Design Electronic Design
Software Design
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29. 1.3 Software Design: File Checker
Prevents information loss through file overwriting
Uses numerical increment in file name (data_1.bin)
Does the file already exist?
Create file with new name No
Yes
Increase numerical increment
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30. 1.3 Software Design: Data Generation and Storage
SPI/ANLG
Sensors
FPGA
DMA FIFO RT
FIFO
RS-485
Data Storage
Telemetry
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31. 1.3 Software Design: Scientific Data Acquisition
Accelerometer: SPI Protocol Current Status: Fully Functional
Magnetsensor: SSI Protocol Current Status: Fully Functional
AD Converter: SPI Protocol Current Status: Partially Functional
Temperature Sensors: Analogue Acquisition Current Status: Partially Functional
Parser Current Status: Partially Functional
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32. 1.3 Software Design: Downlink
VISA serial interface
Benefits:
FPGA loop (previous version) not needed
Complete telemetry packages are sent -> no complex logic to prevent information loss needed
To Do: Decoding of all telemetry packages & definition of new telemetry package (magnetic sensor)
Binary Data
String (U8)
RS485
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33. 1.3 Software Design: Ground Station
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34. 1.4 Software: Summary of Future Work
Add ADC to main project
Adjust the analog acquisition
Adjust the parser to new sensors
Complete the timeline
Complete the ground station (Adjustment to new telemetry packages)
-> Software will be functional till mid-october, so that we can start with the complete functionality test
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35. 2. Auxiliary Project Information Financial Budget Test Plan Outreach
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36. SMARD – Wöchentliches Treffen
2.1 Budget
SS 2014
Electronic:
Structure:
Requested: € €
Spent: € €
Left:
0 € €
WS 2014
Electronic:
Structure:
Requested:
600€
600 €
Spent: 0€
Left:
Left ZARM Budget
~6500€
Reisekosten sollen über Stiftungen abgemildert werden Elektronikteile und Fertigung Struktur muss noch bezahlt werden
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37. 2. Auxiliary Project Information Financial Budget Test Plan Outreach
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38. 2.2 Test Plan Structure Electronic Software
Glue tests %
assembly tests 60% sept.-october
thermal vaccum chamber 0% beginning october
vibration tests 0% Integration week in december
Electronic
functionality test HDRM 60% october
lighting test camera 0% october
Software
software functionality % in progress
lifetime test % in progress
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39. 2. Auxiliary Project Information Financial Budget Test Plan Outreach
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40. 2.3 Outreach ´www.smard-rexus.de Facebook/Twitter articles etc.
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41. Thank you for your attention!
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