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Reliability and Safety Analysis

Reliability and Safety Analysis. RCD Laser System Corey Lane, Ryan Scott, Danny Barjum. Microcontroller. λ p = (C 1 π T + C 2 π T ) π Q π L = 2.36 failures/10^6 hours MTTF = 1/ λ p = .4237e6 hours to failure. Bluetooth Modem.

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Reliability and Safety Analysis

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  1. Reliability and Safety Analysis RCD Laser System Corey Lane, Ryan Scott, Danny Barjum

  2. Microcontroller λp = (C1πT + C2πT) πQ πL = 2.36 failures/10^6 hours MTTF = 1/ λ p = .4237e6 hours to failure

  3. Bluetooth Modem λ p = (C1πT + C2πT) πQ πL = 2.45 failures/10^6 hours MTTF = 1/ λ p = .4082e6 hours to failure

  4. RF Reciever λ p = (C1πT + C2πT) πQ πL = 1.226 failures/10^6 hours MTTF = 1/ λ p = .8157e6 hours to failure

  5. Voltage Regulator λ p = λ pπTπSπCπQπE = .3744 failures/10^6 hours MTTF = 1/ λ p = 2.6709e6 hours to failure

  6. Failure Modes – μC Subsystem

  7. Failure Modes – Battery Subsystem

  8. Criticality Definitions • Low Criticality – Inconvenience to the user or failure of system. λp = 10^6 failures/hours • High Criticality – Potential to harm user. λp = 10^9 failures/hour Potential Improvements • Independent monitoring of the battery voltage as a fail safe for the charger. • Robust battery enclosure to reduce critically of battery overcharging. • Monitor voltage regulator and shutdown system if out of range. • Monitor charging power supply voltage and current. • If RF data connection fails, always draw instead of never draw.

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