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Defender

Defender. Safety and Reliability Analysis. Kirk Iler Brian Bentz Stephen Wolf Fuhe Xu. Issues. Coilgun Backfire Coilguns have a possibility of shooting payload backwards through barrel Signals triggering on noise

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Defender

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  1. Defender Safety and Reliability Analysis Kirk Iler Brian Bentz Stephen Wolf FuheXu

  2. Issues • Coilgun Backfire • Coilguns have a possibility of shooting payload backwards through barrel • Signals triggering on noise • Improper filtering can lead to coilgun commands given through packet sending • Capacitor/Power Malfunction • 400V Electrolytic capacitors are capable of causing explosions if misused • High Voltage power supply used

  3. Potential for Failure • Motor Micro – DRV8821 • Overheat • Hard Stop, loss of control • 12V Power Supply – LM2677-12 • Heat Dissipation (.3W at 3.3V) • Microcontroller – PIC24FJ64GB004 • Firing IGBT – APT200GN60JDQ4MI-ND • Current (400 A) • Capacitors – U32D 400V Electrolytic • Lifetime measurement

  4. Subsystem Definitions • High Voltage • Capacitor • Microcontroller • Atom • Motor

  5. FMECA

  6. FMECA

  7. FMECA

  8. Mitigation • Power Systems • Fuses • Diode on capacitors • Parts can go into Thermal Shutdown • Coilgun • Metal posts to control maximum rotation • Stop in barrel to prevent reverse

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