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Safety and Reliability

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Presentation on theme: "Safety and Reliability"— Presentation transcript:

1 Safety and Reliability
Seraj Dosenbach Greg Lammers Beau Morrison Ananya Panja

2 Critical Safety & Reliability Issues
Safety Concerns Sonar Sensor Failure Motor Control Failure Reliability Concerns Servo Driver Failure Switching Regulator Failures

3 Most Likely to Fail Components
HCS9S12A256 Microcontroller Complexity VNH3SP30 H-Bridge High Current LT1374 Switching Regulator High Power Supply AP1509 Switching Regulator

4 FMECA Analysis Table Failure No. Failure Mode Possible Causes
Failure Effects Method of Detection Criticality A5 Sonar Sensor Failure Failure of HCS9S12 pins 51-53, external sonar sensors Inability to detect unidentified objects. Possibility to damage itself or nearby objects/people at high speeds. Observation High A7 Gripper/Neck Failure Failure of external servos, HCS9S12 pins 78,79,1,2 Unpredictable movement of neck that could cause servos to over extend and burn out Observation, limp neck Medium B1 Motor Driver Failure Shorts of resistors R9, R10, R1, R11, R12, R13, R14, R2, R3, R4, R5, R6, R7 Unpredictable breaking/reversal of left/right motors, but most likely motors will not function. C4 5V Output = 0V Failure of C8, LT1374, C13, U2, U5, U4, C6 Device does not function, too much current being drawn through areas that could heat up and potentially burn out

5 Possible Improvements
Breakaway E-Switch Acts as a “leash” Add Stationary Logic Hub Place microcontroller at stationary location

6 Questions?


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