Chassis Avionics Stack Design Jerry Kim Mechanical Engineering

Chassis & Avionics Stack Design Jerry Kim Mechanical Engineering Space Sciences Laboratory University of California, Berkeley TRIO-CINEMA 1 UCB, 10/8/2010

Agenda • Chassis • • • Redesign Specs SW Models Mock-Ups Issues • Avionics Stack • Redesign • MICD • Mock-Ups • Future Assignments TRIO-CINEMA 2 UCB, 10/8/2010

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 TRIO-CINEMA 3 UCB, 10/8/2010

Chassis Redesign (cont. ) CINEMA STEIN Side Dec. 2009 CINEMA STEIN Side Aug. 2010 • 2 Patch Antennas • No UHF Antenna Cutouts TRIO-CINEMA • 1 Patch Antenna • UHF Antenna Cutouts 4 UCB, 10/8/2010

Chassis Cube. Sat Specs Credit: Cube. Sat Design Specification Rev. 12, The Cube. Sat Program, Cal Poly SLO TRIO-CINEMA 5 UCB, 10/8/2010

Chassis Assembly Mock-Up Model (Aug. 2010) TRIO-CINEMA Flight Model (Aug. 2010) 6 UCB, 10/8/2010

Chassis Top Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • End-Tabs • UHF Cutouts TRIO-CINEMA • No End-Tabs • Asymmetric Screw Locations • Larger UHF Cutouts 7 UCB, 10/8/2010

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 TRIO-CINEMA 8 UCB, 10/8/2010

Chassis End-Plate (+y) Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • “End-Tab” Design • Symmetric Screw Locations TRIO-CINEMA • “No End-Tab” Design • Asymmetric Screw Locations 9 UCB, 10/8/2010

Chassis End-Plate (-y) Mock-Up Model (Jan. 2010) Mock-Up Model (Aug. 2010) • “End-Tab” Design • Symmetric Screw Locations • Mass-Reducing Cutout TRIO-CINEMA • “No End-Tab” Design • Asymmetric Screw Locations • Avionics Stack Mount-Holes • No Cutout (for S-Band) 10 UCB, 10/8/2010

Chassis End-Plate Mock-Up (-y) side TRIO-CINEMA (+y) side 11 UCB, 10/8/2010

Chassis Assembly Mock-Up TRIO-CINEMA 12 UCB, 10/8/2010

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 TRIO-CINEMA 13 UCB, 10/8/2010

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 TRIO-CINEMA 14 UCB, 10/8/2010

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) TRIO-CINEMA 15 UCB, 10/8/2010

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 TRIO-CINEMA 16 UCB, 10/8/2010

Avionics Stack Previous Model Assembly • Single Bulkhead (PCB-shaped) • Threaded Rod & Spacers • Fitted MPS design • End-Plate Mount • RBF bracket • 2 Avionics Bulkheads • Hex Standoffs • Mounting bosses • MPS design TRIO-CINEMA Current Model 17 UCB, 10/8/2010

Avionics Stack MICD (1) TRIO-CINEMA 18 UCB, 10/8/2010

Avionics Stack MICD (2) TRIO-CINEMA 19 UCB, 10/8/2010

Avionics Stack MICD (3) TRIO-CINEMA 20 UCB, 10/8/2010

Avionics Stack MICD (4) TRIO-CINEMA 21 UCB, 10/8/2010

Avionics Stack MICD (5) TRIO-CINEMA 22 UCB, 10/8/2010

Avionics Stack MICD (6) TRIO-CINEMA 23 UCB, 10/8/2010

Avionics Stack MICD (7) TRIO-CINEMA 24 UCB, 10/8/2010

Avionics Stack MICD (8) TRIO-CINEMA 25 UCB, 10/8/2010

Avionics Stack MICD (9) TRIO-CINEMA 26 UCB, 10/8/2010

Avionics Stack MICD (10) TRIO-CINEMA 27 UCB, 10/8/2010

Avionics Stack Assembly Mock-Up TRIO-CINEMA 28 UCB, 10/8/2010

Future Assignments • 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) TRIO-CINEMA 29 UCB, 10/8/2010

Questions? Thank You! TRIO-CINEMA 30 UCB, 10/8/2010