Title: Reliability
1????? ???????????????Reliability
- ?. ???? ?????????
- m_aichouni_at_yahoo.co.uk
- http//aichouni.tripod.com
??????? ? ????? ????? ??? ??????? ??????????? ?
?????? ??????? ????? ? 2005
2????? ?????? ?????? ?????????
- ?? ???? ?????? ? ???????? ????? ?? ??? ???????
?? ?? ?????? ??? ???? ??????? ?????? ?? ????? ???
?? ?????. - ? ??? ??? ??? ??? ???? ???? ?????? ??? ????????
????? ??? ?????? ??? ?????? ?????? ????? ?????
?????. ? ??? ?? ???? ???????? ?????? (Product
Reliability). - ??????? ?????? ?? ??????? ????? ????? ?????
?????. - (Reliability is quality over time)
3????? ????????? ?? ??????
- ??????? ??? ????? ?????????
-
- ???????? ????? ???????? (1972)
- ????? ???????? ?? ???? ????? ? ????? ??? ??????
????. - ????? ??????? ???? ???? ?? ?????? ?????? ??????.
- ?????? ?? ????????? ?????? ????? ?????
4????????? Reliability
- ????????? ?? ????? ????? ?????? ??? ?? ?????
- ??? ?? ?????? ?????? ?? ??? ?????? ??? ????
??????? ?????? ? ?????? ?? ?????. - ??????? ?????? ?? ?????? ??? ??? ?? ??????
?????? ???? ???? ????? ????? ? ??? ???? ??? ?????.
5 ????? ????????? Reliability
- ??????? ?????? ?? ????? ?????? ?????? ??? ????
??????? ???????? ??? ????? ?? ???? ??????? ?????
? ???? ????? ????? . - ???? ?? ????????? ??????? (Probability) ????
?????? ??????? ?????? ?? ????? ? ??? ????
????????? ???????. - ? ???? ???? ???? ??????? ???? ?????? ???????
?????? ?? ????? ? ???? ????? ?????.
6 ??????? ???????? ?????????
- ???? ??????? ?????? ??????? ???? ?????? ???????
?????? ?? ????? ? ??? ???? ????????? ??????? ?
???? ????? ?????. - ???? ????? ( Numerical Value) ???? ???????? ???
?????? ????? ?????? ? ??? ???? ?? ??????? ????
??? ????? . - ??????? ???????? ?? ?????? ( Intended Function)
- ??? ????? ????? ??? ?????? ( Products Life)
- ???? ????????? ( Environmental Conditions)
7????? ????????? ?? ?????? ? ?? ??????
- ?? ?????? ?????? ?? ??? ??????? ????? ????????
???? ?????? ?? ??????? (?????? ?????? ???? ?????
??????)? ??? ???? ?? ?????? ???????? ??? ??? ????
???? ????. ??? ??? ????? ??? ???????? ??? ???????
?????? ? ??? ? - ??????? ?????? ??? ??????? ?????
- ????? ????? ?????? ? ??????? ??? ??? ???? ??
???????? - ??????? ??? ??????? ??????? ????
- ????? ????? ??????? ?? ?????? ??????? ? ?????
??? ???????? ??? ???? ?????? ??? ????? ???
???????? - ??????? ?????? ?????? ????????? ? ?????? ????????
? ??????? ?????? ?????? ?? ???? ???? ???? ???
????? ???????. - ????? ???????? ??????? ??????? ???????? ?????? ?
???? ???? ????? ??????
8??????? ?????? System Reliability
- ???? ???????? ???????? ?? ????? ?? ?????? ??
???????? ????? ? ???? ????? ??????. - ?? ??????? ?? ???? ??? ??? ? ????? ????? ????????
?? ?????? ???? ??? ??????? ?????? ??? (?? ???????
?????? ). - ???? ????? ? ????? ????????
- ????? ??? ??????? series (?????? ???? ??? ????
???? ????????) - ????? ??? ??????? parallel(?????? ???? ??? ???
???? ????) - ????? ????? ( ? ???? ?????????)
9 ????? ???????? ??? ??????? Components in
Series
- ??? ???? ???????? ????? ???????? ? ??? ??????
???? ??? ???? ???? ????????. - ?? ???? ???? ( N) ???? ?? ?????? ????? ?????????
? ??????? ?? ???? ?? (Ri ) ??? ??????? ??????
Rs ???? ??? ???
Rs R1 x R2 x R3 x RN
???? ????? ?????? ?????? ??? ???????
10 ????? ???????? ??? ??????? Components in
Parallel
- ??? ???? ???????? ????? ???????? ??? ?????? ????
??? ??? ??? ????????. - ?? ???? ???? ( N) ???? ?? ?????? ????? ?????????
? ??????? ?? ???? ?? (Ri ) ??? ??????? ??????
Rp ??
Rp 1 (1-R1) (1-R2) (1-RN)
???? ????? ?????? ?????? ??? ???????
11???? ????? ??? ???? ???????
- ??? ??? ?????? ????? ??? ???? ??????? ?????? ???
???? ??? ????? ????????. -
- ???? ??????? ?????? ????????
- ? ???? ????? ??? ??????? ?????
-
Rp 1- (1-R1 ) (1-Rb)
Rp R1 Rb (1-R1)
12??????? ??? ???? ????????? (???? 1)
???? ??????? ??????
- ???????
- ????? ?????? ?? 2 ?? ???????? ????? ??? ???????
- ??????? ?????? Rs ??
- Rs 0.95 x 0.95 0.9025
Rs R1 x R2
13??????? ??? ???? ????????? (???? 2)
???? ??????? ?????? ?????? ?????
14??????? ??? ???? ????????? ( ?? ?????? 2)
- ???? ?????? ? ??? ????? ??????? ???????? ???? ??
??? ??????? - R1 0.9 0.95 0.855
- R2 0.95 0.95 0.9025
- ? ?? ?? ???? ??????? ???????? ????????? ????
????? ????? - Rp 1-(1-R1)(1-R2)
- 0.855 0.145 0.9025
- Rp 0.855 0.130863 0.985863
15????? ????? ??????? ???? (???? 3)
???? ??????? ?????? ?????? ?????
16????? ????? ??????? ???? (?? ?????? 3)
1 ???? ?????? ? ???? ????? ??????? ????????
??????? ??? ???????
R2 0.8 0.75 0.6
R3 0.9 0.95 0.9 0.7695
17????? ????? ??????? ????
2 ???? ??????? ???????? ????????? 2 ? 3
- Rp1 1 (1-R2)(1-R3)
- 1 (1-0.6)(1-0.7695)
- 1 0.4 x 0.2305
- 0.9078
R1 0.855 R2 0.6 R3 0.7695
3 ???? ??????? ?????? (?????? ??? ???????)
Rp 1 (1-R1)(1-Rp1) 1
(1-0.855)(1-0.9078) 1 0.145 x 0.0922 Rp
0.9866310
18??????? ??? ???? ????????? (???? ??)
??????? 1 - ???? ??????? ?????? ?????? ?? 3
?????? ????? ??? ??????? . ??????? ????????
?????? A, B, C ?? 0.95, 0.92, 0.90 ??????? 2
?? ?? ??????? ?????? ??? ???? ???????? ??????
????? ??? ???????.
19??????? ??? ???? ????????? (???? ??)
??????? 3 - ???? ??????? ?????? ?????? ?????
??????? 4 - ???? ??????? ?????? ?????? ?????
20??????? ??? ???? ????????? (???? ??)
??????? 5 ????? ???? ?? 5 ?????? ????? ???
??????? ? ??????? ?? ???? ????? 0.96 . ??? ?????
?????? ? ???? ????? ??? 3 ?????? ???. ?? ??
?????? ?? ??????? ??????.
21- ????? ??? ???? ????? ??? ????????
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?????? ?? ?????. ????? ?? ????? ??? ?????? ?
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?????? ????????? ? ???????? ???????? ?? ????????
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????.
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?????? www.arabicstat.com/forums/forum12/ ??
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