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changes.mady.by.user Aaron Dyck

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changes.mady.by.user Anthony Luo

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Info

Think about the follow categories when creating a list of risks:

Technical: Requirements, Technology, Interfaces, Performance, Quality

External: Customer, Contract, Market, Supplier

Organizational: Project Dependencies, Logistics, Resources, Budget

Project Management: Planning, Schedule, Estimation, Controlling, Communication

🟩 added to Analysis and Response

General Failures

  1. 🟩 Part delivery is much slower than expected, pushing back testing and therefore project deadlines

  2. Members miss deliverable due to increased work load

  3. Schedule didn’t allow for multiple iterations to occur, now we’re stuck with a less-than-ideal product

  4. 🟩 The drone isn’t competitive

  5. The drone crashing during competition…

  6. battery level low

Mechanical Airframe Failures

  1. Unanticipated electromagnetic shielding/interference on the frame, requiring electronics to be placed elsewhere

  2. Bolts missing/coming off during flight

  3. Landing gear fails on impact

  4. Barbies are not secured properly in flight

  5. Boards are not secured in flight

  6. Water gets into the avionics compartment

  7. Parts disconnect during flight (wings, tail)

  8. Control surfaces fail

  9. Motor failure

  10. Sensors dislodged

  11. Heat causing deformation of 3D printed parts

  12. Mechanical failures (permanent deformation or breaking) caused by stresses

  13. Elastic deformation of frame due to stresses

  14. Imperfections in machined parts (3D printed brackets included) causing stress concentrations → fracture → propagate to fatal failure

Ground Station Failures

  1. Antenna towers fall over

  2. Wires disconnect in inaccessible regions of the tower

  3. Devices and equipment are damaged in transport, we only find out when we get there

  4. Power failures

  5. Controls loops failure

  6. Antennas damaged by weather (hail, due to stresses from wind, water damage)

  7. Over/undervolting by accident

Electronic Failures

  1. Wires disconnecting

  2. Boards shorting

  3. static electricity (possible ground plane)

  4. Inclement weather during flight (limit flight window)

  5. Antenna Brownout → drone altitude hold, antenna pattern search → fatal failure.

  6. hardfault (failover)

  7. Batteries not charged

    1. batteries discharging past safe levels

  8. Arc short

  9. Overheating & auto-shutoff

Software Failures

  1. Sens failure (glide)

  2. autopilot failure (pilot takeover)

  3. fly by wire failure

    1. lost AHRS // no inertial nav → fatal failure

    2. incorrect command deciphering → pilot disarm / takeover → fatal failure

    3. control surface output inverted. → pilot disarm/takeover → fatal failure.

  4. telemetry lost (follow VFR & divert)

    1. telemetry modem failure

    2. board modem module failure

    3. software manager failure.

  5. controls/PID failure

    1. incorrect PID values

    2. controls runaway (I term runaway?)

    3. flipped motor direction

  6. RC link lost (divert and glide)

  7. Landing Pad not found

    1. search → find?

  8. heading lost

    1. see 3, 6.

  9. RF Interference from other teams/environment

Pilot failures

  • improper site assessment

    • flying into obstacles // not being aware of restricted flight areas

  • improper communication

  • heat?cold?

  • dehydration

Risk Analysis (use to understand impact)

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