1 / 43

Mission Statement and Objectives

Mission Statement and Objectives. Design Requirements. Functional Log radiation and corresponding altitude for duration of flight (up to 90,000 feet and back) Store data on non-volatile memory

evette
Download Presentation

Mission Statement and Objectives

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. Mission Statement and Objectives

  2. Design Requirements Functional • Log radiation and corresponding altitude for duration of flight (up to 90,000 feet and back) • Store data on non-volatile memory • Provide power for duration of flight plus one hour set up and one hour for recovery (4 hours minimum) • Indicate the unit is powered on • Indicate system is running properly • Ensure system is both water-resistant and buoyant • Provide internal fire resistance • Provide internal temperature regulation • Ensure system will operate within temperature range and withstand forces of launch, ascent, balloon breaking, descent, and landing • Ensure system can attach to research computer payload • Ensure combined system can attach to Borealis balloon Performance • Log radiation and altitude data each second • Provide 5 watts per hour over 4 hour flight • Provide sound and/or light to indicate power is on • Provide sound and/or light to indicate the system is operating properly • Ensure water cannot leak into system and payload floats • Enable system to shut down if internal temperature exceeds 100 C • Ensure system can withstand vertical force of 10Gs and horizontal force of 5Gs (according to HASP requirements) • Ensure payload temperature stays within and will operate between -60 and 60C (external) and between -20 and 40C (internal) • Ensure pressure sensor can withstand 0-90kPa Physical • Ensure system does not exceed maximum dimensions: 5.5” by 5.5” by 5.5” • Ensure system does not exceed maximum mass: 6 lbs Reliability • Ensure system can launch twice and withstand internal tests: • Drop test • Bench-top burn test • Cold room test • Water resistance test • Pressure test • Recover all components and ensure internal components are not damaged

  3. Design Alternatives

  4. Design Comparison

  5. Final Decisions and Budget Raspberry Pi: $25 + SD Card: $13 Total: $38

  6. Computer Subsystem Tests Test 1-Connect Geiger counter to development board - Read and interpret data Test 2-Connect pressure sensor to development board - Read and interpret data while in pressure chamber Test 3-Write to SD card

  7. Program Design

  8. Radiation Sensors

  9. Ratings

  10. Additional Acrylic conformal coating to protect both Geiger counter and the rest of the circuit

  11. Pressure/Altitude Sensor

  12. Ratings

  13. Load

  14. DC/DC Converter

  15. Ratings

  16. Power Source

  17. Configuration 5 Batteries 6 Batteries 8 Batteries

  18. Configuration

  19. Ratings

  20. Electrical Subsystem Tests Burn in test • Breadboard the design and power the circuit, to see how long the batteries last DC/DC converter test • Test to make sure the DC/DC converter is outputting the right value Cold test • Place the fully manufactured circuit in the enclosure and test the enclosure in the cold lab

  21. Final Decisions and Budget Geiger Counter: $150 + Pressure Sensor: $33 + DC/DC Converter: $7 + Batteries: $80 + Battery Boxes: $5 + PC Boards: $12 + Misc: $20 Total: $307

  22. Structural Alternatives 1. 2. 3. 4. -Hard Foam -Gorilla Tape -Packing Tape -Hard Foam -Gorilla Tape -Packing Tape -Fiberglass -Thinsulate -Vinyl -Fiberglass

  23. Preliminary Testing- Prototype 1 -Hard Foam -Gorilla Tape -Packing Tape -Fiberglass

  24. Attachment Method- Prototype 1 • Bottom of our payload will be bolted to top of research computer payload • Research computer payload will attach to BOREALIS Balloon -Prototype Lid -4 Screws -Prototype Box -Existing Research Payload

  25. Drop Test- Prototype 1

  26. Internal Testing- Prototype 1 • Burn test- tested material resistance to fire • Shredded Polyurethane Foam • Burns only when flame is held on foam • Thinsulate • Melts when flame is held on it but does not catch fire • Packing tape • Melts when flame is held on it but does not catch fire • Polystyrene Foam Board • Melts when flame is held on it but does not catch fire • Fiberglass • Melts when flame is held on it but does not catch on fire

  27. Cold Test- Prototype 1 Test 3: Control Box: No Thinsulate Bag, No Shredded Packing Foam Test 1: No Thinsulate Bag, Shredded Packing Foam Test 2: Thinsulate Bag, Shredded Packing Foam Thermocouple on circuit board Thermocouple on battery pack

  28. Cold Room Test- Prototype 1

  29. Budget Building Materials: $40 packing tape, fiberglass kit, gorilla tape, gorilla glue, etc. + Shredded Foam: $2 + Polystyrene ½” Board: $2 + Thinsulate: $15 + TI Sensor Tag: $25 Total: $84

  30. Overall Budget CS Materials $38 + EE Materials $307 + ME Materials $84 Total: $429 $171 under budget!!!

  31. Computer Subsystem Anticipated Schedule = Event = Milestone Window Window

  32. Electrical Subsystem Anticipated Schedule = Event = Milestone Window Window

  33. Mechanical Subsystem Anticipated Schedule = Event = Milestone Window Window

  34. Thank you!

More Related