Basic quantitative skills for reliability engineering

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MRE5101 Basic quantitative skills for reliability engineering - Monash University

Assignment: 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.

Reference no: EM132500641

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