Assignment Task: Reliability Analysis
Problem 1: Confidence limits for the MTBF
Data relating to manpack radios is shown in the following table, use mid-points of the utilisation ranges:
|
Utilisation Hours
|
Number of Sets
|
Number of Failures
|
|
0-50
|
100
|
8
|
|
50-100
|
200
|
8
|
|
100-150
|
200
|
10
|
|
150-200
|
100
|
4
|
Use chi-squared tables to estimate the MTBF and give a 90% confidence interval. Show your full working.
Problem 2: Maintainability
An aircraft maintenance check takes the following times in minutes to complete on six successive occasions:
49, 59, 43, 65, 55 and 58
Find a suitable distribution to fit these data and estimate the maintainability, given a maintenance constraint of 60 minutes. (Note: The maintainability is the probability that the maintenance is completed within the maintenance time constraint.)
Problem 3:
(a) State the conditions which must apply if the preventive replacement of a component or assembly is to be economically worthwhile.
(b) Describe the three alternative replacement policies:
(i) Replace only on failure.
(ii) Age-based preventive replacement.
(iii) Block replacement.
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