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Fly Spy – Group 12 Reliability and Safety Analysis

Fly Spy – Group 12 Reliability and Safety Analysis. Heather Barrett. Definition of Criticality Levels (In-flight operation). High : Plane crashes (goes out in a blaze of glory) or cannot be returned to manual control (flies off into the “Wild Blue Yonder”)

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Fly Spy – Group 12 Reliability and Safety Analysis

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  1. Fly Spy – Group 12Reliability and Safety Analysis Heather Barrett

  2. Definition of Criticality Levels(In-flight operation) • High : Plane crashes (goes out in a blaze of glory) or cannot be returned to manual control (flies off into the “Wild Blue Yonder”) • Medium : Loss of autonomous control functionality; Must return to manual control • Low : Some loss of non-critical functionality (ex. Cannot take pictures)

  3. Components Chosen for Analysis • Few components are complex or run hot • Microcontroller (PIC24FJ256GA110): Most complex component • Mux (P13V512): Operation is essential; controls switching between manual and autonomous modes • Buck Converter (LTC1174) : Operation is essential; everything (including micro and mux) is powered on the +3.3 V rail

  4. FMECA – Microcontroller

  5. Control Mode Switching System

  6. Control Mode Switching System

  7. FMECA – Control Mode Switching System

  8. Power Supply

  9. FMECA – Power Supply

  10. Additional Remarks • Due to software complexity, most of these hardware failures appear trivial concerns • In retrospect, should have powered mux on +5 V rail like the servos and motor; if +3.3V source fails, mux fails (no signal to servos  CRASH)

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