1 / 44

CINEMA Mechanical Subsystem PDR August 22, 2008 David Glaser/Paul Turin

CINEMA Mechanical Subsystem PDR August 22, 2008 David Glaser/Paul Turin. MECHANICAL -- Overview. Mechanical Requirements Mechanical Subsystems Chassis Solar Array Communication Hardware Torque Coils Sun Sensor Magnetometer Boom STEIN Mass Budget. MECHANICAL – Requirements.

duff
Télécharger la présentation

CINEMA Mechanical Subsystem PDR August 22, 2008 David Glaser/Paul Turin

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CINEMA Mechanical Subsystem PDR August 22, 2008 David Glaser/Paul Turin CINEMA PDR- MEC

  2. MECHANICAL -- Overview • Mechanical Requirements • Mechanical Subsystems • Chassis • Solar Array • Communication Hardware • Torque Coils • Sun Sensor • Magnetometer Boom • STEIN • Mass Budget CINEMA PDR- MEC

  3. MECHANICAL – Requirements • Meet Cubesat Interface and Mass Specifications • Withstand Launch Environmental Loads • Keep Internal Magnetic Field to a Minimum • Design • Bus Chassis • House All Components in Bus • STEIN Instrument Attenuating Shutter • Magnetometer Boom Deployment Mechanism • Magnetometer Harness • Harnessing (TBD) CINEMA PDR- MEC

  4. MECHANICAL – CubeSat Req. • CINEMA must fit inside a P-Pod (Poly-Picosatellite Orbit Deployer) and be deployed without jamming • No parts may separate from the satellite (no space debris created) • No pyrotechnics allowed • Maximum Mass: 3 kg (negotiable?) • Kill Switch, Deployment Switch, and Spring Plungers P-POD CAD Image http://cubesat.atl.calpoly.edu/pages/reference/pictures.php KC-135 P-POD Test Video http://cubesat.atl.calpoly.edu/pages/reference/videos.php CINEMA PDR- MEC

  5. MECHANICAL -- Chassis Rails Hard Anodized 100 mm 340.5 mm 100 mm • 0.050 inch thick Aluminum Sheet Metal • Ends – ¼ inch Aluminum • Rail Dimensions to Cubesat Specifications CINEMA PDR- MEC

  6. MECHANICAL -- Chassis Spring Plunger Deployment Switch Spring Plunger CINEMA PDR- MEC

  7. MECHANICAL -- Overview Genesat Avionics Box Mag Boom Deployer STEIN Science Radio Transmitter Outboard Magnetometer Components will generally be fastened with a #4-40 flathead screw, countersunk into chassis. Inboard Magnetometer Sun Sensors CINEMA PDR- MEC

  8. MECHANICAL – Solar Array • 10 Panels (3 on each long side 1 Panel on top, bottom, and short sides) • Each Panel 3 x 3.2 inches (7.6 x 8.1 cm) • Nominal Bus Voltage is 9.2 V • Therefore need 4x PV cells on each panel • Typical cells too large • TASC cells are small enough, but require assembly, and have no coverglass CINEMA PDR- MEC

  9. MECHANICAL – Solar Array TASC PV Cells (Spectrolab) 1.55 cm (.61 inches) 3.18 cm (1.25 inches) • 20 Cells/Panel • 8 Panels • Cost of Cells: $500 • No Coverglass Included • Cost of Assembly ? CINEMA PDR- MEC

  10. MECHANICAL - Communication • Science Data Transmitter • Telemetry Transceiver • 2 Science Data Patch Antennas • 2 Telemetry Patch Antennas Patch Antennas CINEMA PDR- MEC

  11. MECHANICAL – Torque Coils Coils located on STEIN Side and Bottom Torque Coil Rail CINEMA PDR- MEC

  12. MECHANICAL – Torque Coils • 28 AWG Magnet Wire (0.32 mm diam./ max current 1.4 A) • 62 Turns (50 m of wire) • Coil Length: 0.317 m Width: 0.086 m • Effective Coil Area: 0.0256 m2 • Electrical Resistance: 10.65Ω CINEMA PDR- MEC

  13. MECHANICAL – Sun Sensors • Field of View Per Sensor: 5° Azimuth x 41° Elevation • 2 Sensors @ 45° to Vertical, 90° to Each Other • Sensor: Phototransistor (Motorola MRD300) • Prototype Tested • Load Resistor: 1 kΩ • Vcc = 5 V • Power: ~25 mW (Light); ~10µW (Dark) 2.3 cm 1.6 cm CINEMA PDR- MEC

  14. MECHANICAL – Sun Sensors Prototype Scanned Across Sun @ 1 RPM Averaged Data Nominal 1.4° Width of Opening 4.6° > 1 Volt Simulation of Earthshine Rise Time ~120 ms CINEMA PDR- MEC

  15. MECHANICAL – Sun Sensors Raw Data Large Noise Peaks Probably Due to DC Motor Noise ~ -0.3 V Slope of Rise: ~ 35 V/sec Timing Error = 9 ms < 0.1° CINEMA PDR- MEC

  16. MECHANICAL – Mag & Boom CINEMA PDR- MEC

  17. MECHANICAL – Mag & Boom • 1 meter stacer boom • Held by TiNi P5 Pin Puller • Magnetometer in 2 x 2 x 2 cm compartment • Magnetometer Harness • 18 strands of 36 AWG magnet wire • Aracon braid for Harness Jacket • Non-Magnetic Braid on 6 cm closest to sensor • Fixed to Mag Mount and Base of Boom via Screw-Down Fixtures • 18-pin Connector at End CINEMA PDR- MEC

  18. MECHANICAL – Mag & Boom Magnetometer Mount Magnetometer Chassis Mounts CINEMA PDR- MEC

  19. MECHANICAL – Mag & Boom TiNi Pin Puller Stowed Stacer Boom Release Pin CINEMA PDR- MEC

  20. MECHANICAL – Mag & Boom Harness Details Harness Constraining Fixtures String Cannister CINEMA PDR- MEC

  21. MECHANICAL – Mag & Boom CINEMA PDR- MEC

  22. MECHANICAL – Mag & Boom Harness Assembly CINEMA PDR- MEC

  23. MECHANICAL – Mag & Boom Anti-vibration Clearance 0.02 inches (0.5 mm) CINEMA PDR- MEC

  24. MECHANICAL – Mag & Boom Prototype Harness • 36 AWG Magnet Wire with Polythermalize Insulation • Examined for Wear Under Microscope • 18 Strands Wound with a winding machine, 1 turn/cm • Tension on cable not controlled • Inserted into Aracon Braid • Harness Deploy Tested on Mockup Boom CINEMA PDR- MEC

  25. MECHANICAL – Mag & Boom Boom & Harness Mock Up – Stowed Configuration ID 2.54 cm Annulus 3.8 mm CINEMA PDR- MEC

  26. MECHANICAL – Mag & Boom Boom & Harness Mock Up – Deployment Test Video (half speed) CINEMA PDR- MEC

  27. MECHANICAL -- STEIN • Collimator: 40° x 60° FOV • High Voltage Plates: 4 mm separation, ~1 cm from detector • Attenuator: Swinging Shutter with BeCu Foil • Actuated by Two SMA “Nanomuscles” • Flight Heritage from THEMIS and other Missions • Low Electrical and Magnetic Noise • Microswitch Overcenter Mechanism CINEMA PDR- MEC

  28. MECHANICAL -- STEIN Collimator Attenuator Detector and Electronics CINEMA PDR- MEC

  29. MECHANICAL -- STEIN Collimator Electric Field Plates 60° CINEMA PDR- MEC

  30. MECHANICAL -- STEIN Attenuator Shutter Shutter with BeCu Foil 4 Pixel Detector CINEMA PDR- MEC

  31. MECHANICAL -- STEIN Actuators – Shutter Closed Nanomuscle Actuator Pivot Lever Countermass Capton Yoke Cam/Lever CINEMA PDR- MEC

  32. MECHANICAL -- STEIN Actuators – Shutter Open CINEMA PDR- MEC

  33. MECHANICAL -- STEIN Attenuator Overcenter Mechanism HM Microswitch Spring Plunger Cam Bearing CINEMA PDR- MEC

  34. MECHANICAL -- STEIN Attenuator Mechanism Specifications CINEMA PDR- MEC

  35. MECHANICAL -- STEIN Attenuator Mechanism Analysis Maximum Torque from Nanomuscle and Lever CINEMA PDR- MEC

  36. MECHANICAL -- STEIN Attenuator Overcenter Mechanism – Cam Analysis CINEMA PDR- MEC

  37. MECHANICAL -- STEIN Attenuator Overcenter Mechanism – Cam Analysis CINEMA PDR- MEC

  38. MECHANICAL -- STEIN Attenuator Mounting – How to Locate These Components CINEMA PDR- MEC

  39. MECHANICAL -- STEIN 1. Attenuator Mounting – Collimator Shell CINEMA PDR- MEC

  40. MECHANICAL -- STEIN 2. Attenuator Mounting – Add Mount Plate CINEMA PDR- MEC

  41. MECHANICAL -- STEIN 3. Attenuator Mounting – Add Shutter and Actuators CINEMA PDR- MEC

  42. MECHANICAL -- STEIN 4. Attenuator Mounting – Add Switch Mounts CINEMA PDR- MEC

  43. MECHANICAL -- STEIN 5. Attenuator Mounting – Add Switches #0-80 Set Screw for Switch Location Adjustment CINEMA PDR- MEC

  44. MECHANICAL – Mass Budget Highlighted figures Have changed since the proposal. Most other figures are rough estimates. CINEMA PDR- MEC

More Related