1. Reliability & Safety Analysis
Omar
Team 8
Robert Toepfer
Trent Nelson
Mike Cianciarulo
Josh Wildey

2. Criticality High Low Irreparable damage Possible user injury
Longer room mapping time
Loss of room mapping
Loss of image recognition

3. Components A: power subsystem B: drive subsystem
5V LDO
B: drive subsystem
motors
C: software subsystem (and supporting components)
Microcontroller

4. 5V LDO A1 Output = 0V -Battery fails -LDO fails -Doesn’t run#
Failure Mode
Possible Causes
Failure Effects
Method of Detection
Criticality A1
Output = 0V
-Battery fails
-LDO fails
-Doesn’t run
-Power LED off
Low A2
Output > 5V
-Potential damage to components
-Smoke
-Excess heat
High A3
Input short
-Contact of conductive surface with PCB
-Component Damage
-User injury
-Fire
-Battery explodes

5. Motors B1 Windings fail -Insulation fails -Windings break#
Failure Mode
Possible Causes
Failure Effects
Method of Detection
Criticality B1
Windings fail
-Insulation fails
-Windings break
-Motor(s) stop
-Vehicle stops
-Possible smoke
Low B2
Brushes fail
-Wear
-High input current

6. Microcontroller (ATmega32)#
Failure Mode
Possible Causes
Failure Effects
Method of Detection
Criticality C1
No communication with Gumstix
-Failed interconnect
-VCC out of range
-Dead port pins
-Failure to map room
-Failure to determine new heading after obstacle detected
-Vehicle stops after detecting obstacle
Low C2
No communication with sensors
-Failure to detect obstacles
-Vehicle crashes
-Fire
High

7. Questions?