MPD 575 Design for Reliability. Jonathan Weaver. DReliability Development History. Originally developed by MPD Cohort 3 team of Julie Earle, Dave Herczeg, and Jim Van Gilder in Fall 2002. Design for Reliability. Why Design for Reliability?.
Two types of failure mode:
a) hard = something breaks
b) soft = performance degrades
Two root causes:
1. lack of robustness (sensitivity to noise factors)
to quality problems.
it is mainly through keeping customers out of the service department in the first place.
Robustness Assessment and Noise Factor Management Matrix
“In the development of robustness, it is essential to provide one noise condition for each failure mode”.
Don Clausing, Professor of Engineering, MIT.
Potential Failure modes
Failure mode to test traceability and
Noise factor to test traceability leading to ...
Reliability & Robustness Demonstration
Noise factor management strategy
Noise to failure mode traceability
Battery Suspension bushing
1. 2. 3. 4. 5.
Change (i)Parameter (ii)Beef-up Reduce Comp- Disguise
Concept Design. Design Noise ensate
Piece-to-piece x x x
Wear Out x x x
Customer Use x x x
External Environmentx x x
System Interactions x x x x