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Chassis & Avionics Stack Design Jerry Kim Mechanical Engineering Space Sciences Laboratory

Chassis & Avionics Stack Design Jerry Kim Mechanical Engineering Space Sciences Laboratory University of California, Berkeley. Agenda. Chassis Redesign Specs SW Models Mock-Ups Issues Avionics Stack Redesign MICD Mock-Ups Future Assignments. Chassis. Redesign.

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Chassis & Avionics Stack Design Jerry Kim Mechanical Engineering Space Sciences Laboratory

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  1. Chassis & Avionics Stack Design • Jerry Kim • Mechanical Engineering • Space Sciences Laboratory • University of California, Berkeley

  2. Agenda • Chassis • Redesign • Specs • SW Models • Mock-Ups • Issues • Avionics Stack • Redesign • MICD • Mock-Ups • Future Assignments

  3. Chassis Redesign CINEMA Mag Side Dec. 2009 CINEMA Mag Side Aug. 2010 • 2 Patch Antennas • No Sun Sensor Mount Holes • No UHF Antenna Cutouts • 1 Patch Antenna • Sun Sensor Mount Holes • UHF Antenna Cutouts

  4. Chassis Redesign (cont.) CINEMA STEIN Side Dec. 2009 CINEMA STEIN Side Aug. 2010 • 2 Patch Antennas • No UHF Antenna Cutouts • 1 Patch Antenna • UHF Antenna Cutouts

  5. Chassis CubeSat Specs Credit: CubeSat Design Specification Rev. 12, The CubeSat Program, Cal Poly SLO

  6. Chassis Assembly Mock-Up Model (Aug. 2010) Flight Model (Aug. 2010)

  7. Chassis Top Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • End-Tabs • UHF Cutouts • No End-Tabs • Asymmetric Screw Locations • Larger UHF Cutouts

  8. Chassis Bottom and Sides Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • End-Tabs • No Sun Sensor Mount Holes • Side UHF Antenna Cutouts • No End-Tabs • Sun Sensor Mount Holes • Bottom UHF Antenna Cutouts

  9. Chassis End-Plate (+y) Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • “End-Tab” Design • Symmetric Screw Locations • “No End-Tab” Design • Asymmetric Screw Locations

  10. Chassis End-Plate (-y) Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • “End-Tab” Design • Symmetric Screw Locations • Mass-Reducing Cutout • “No End-Tab” Design • Asymmetric Screw Locations • Avionics Stack Mount-Holes • No Cutout (for S-Band)

  11. Chassis End-Plate Mock-Up (-y) side (+y) side

  12. Chassis Assembly Mock-Up

  13. Chassis Issues (Rail Cutouts) • “At least 75% of the rail shall be in contact with the P-POD rails” (2.2.13) • Last calculation ~15% missing

  14. Chassis Issues (Recessed End-Plate) • “All components shall not exceed 6.5 mm normal to the [Z face]” (2.2.6) • Components on the Z side must rest below the surface of your standoffs

  15. Chassis Issues (Rail Screws) • The rail contact areas is to have a level surface • Recess screws • Issues with debris, especially if staking compound used for the screws • “At least 75% of the rail shall be in contact with the P-POD rails” (2.2.13)

  16. Chassis Issues (Top/Bottom & Sides Joint) • “The edges of the rails shall be rounded to a radius of at least 1 mm” (2.2.11) • Should work but won’t know until fit-check

  17. Avionics Stack Assembly Previous Model Current Model • Single Bulkhead (PCB-shaped) • Threaded Rod & Spacers • Fitted MPS design • End-Plate Mount • RBF bracket • 2 Avionics Bulkheads • Hex Standoffs • Mounting bosses • MPS design

  18. Avionics Stack MICD (1)

  19. Avionics Stack MICD (2)

  20. Avionics Stack MICD (3)

  21. Avionics Stack MICD (4)

  22. Avionics Stack MICD (5)

  23. Avionics Stack MICD (6)

  24. Avionics Stack MICD (7)

  25. Avionics Stack MICD (8)

  26. Avionics Stack MICD (9)

  27. Avionics Stack MICD (10)

  28. Avionics Stack Assembly Mock-Up

  29. Future Assignments • Chassis • Chassis Top Mock-Up • Simplify design (easier to machine) • Cal Poly Fit-Check • Add cutouts as needed • Avionics Stack • Remaining parts expected by Oct. 18 • Assembly Practice • Harnessing Practice (with Chassis Mock-Up)

  30. Questions? Thank You!

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