system-reliability in condiryion monitoring concept

1
System reliability
Objectives
• Learn the definitions of a component and a
system from a reliability perspective
• Be able to calculate reliability of series,
parallel and complex systems given the
reliabilities of their components

2
Definition of components and
systems
• Component: One failure mode, one
performance function
• System reliability: multiple failure modes,
multiple performance functions
• Block diagram: Shows effect of the failures
of the components on the failure of the
system

3
Series system
Calculation of reliability
• System fails if any one of its components
fails
1 … n
2
RS=R1…  Rn
Independent components

4
Parallel system:
calculation of reliability
• System survives if one component survives
1
2
3
n
 



n
i
i
s R
R
1
)
1
(
1

5
Generic approach for reliability
analysis of complex systems
• List all possible modes
• Break down the event “system failure” into
disjoint events
• Calculate the failure probabilities of these
events
• System failure probability equals the sum of
probabilities of the above events.

6
Suggested reading
• Thoft-Christensen, “System Reliability,”
Engineering Design Reliability Handbook,
CRC press, 2004, p. 15-1.

system-reliability in condiryion monitoring concept

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