Download - Safety and Reliability
SAFETY AND RELIABILITYSeraj DosenbachGreg LammersBeau MorrisonAnanya Panja
Critical Safety & Reliability Issues
Safety Concerns Sonar Sensor Failure Motor Control Failure
Reliability Concerns Servo Driver Failure Switching Regulator
Failures
Most Likely to Fail Components HCS9S12A256
Microcontroller Complexity
VNH3SP30 H-Bridge High Current
LT1374 Switching Regulator High Power Supply
AP1509 Switching Regulator High Power Supply
FMECA Analysis TableFailure No. Failure Mode Possible Causes Failure Effects
Method of Detection Criticality
A5Sonar 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
A7Gripper/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
B1Motor 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. Observation High
C4 5V Output = 0VFailure 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 Observation Medium
Possible Improvements Breakaway E-Switch
Acts as a “leash”
Add Stationary Logic Hub Place
microcontroller at stationary location
Questions?