Question 5%
BUAN ÇÖZ
In the Reliability Block Diagram, Figure Q5, the reliabilities of the units R1, R2, R3
and R4 are 0.85, 0.80, 0.90 and 0.70 respectively.
R1
R2
R3
Figure Q5
a) Determine the system reliability.
R4
[30%]
To improve the reliability of the system in Figure Q5, two options may be considered:
i) Active redundancy at the system level, when a second identical system is
added; or
ii) Active redundancy at the component level, when for each component, a
second identical component is added.
b) Determine the system reliability for option i);
c) Determine the system reliability for option ii); and
[20%]
[40%]
d) Given the answers determined in b) and c) and the possibility of failure during
switching, justify which option you would prefer.
[10%]