Failure Times - Duane Example: Difference between revisions
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<li> The following figure shows the cumulative and instantaneous MTBF curves. | <li> The following figure shows the cumulative and instantaneous MTBF curves. | ||
[[Image:rga4.12.png | [[Image:rga4.12.png|center|450px]]</li> | ||
<li>The next figure shows the cumulative test and development hours needed for an instantaneous MTBF goal of 500 hours. | <li>The next figure shows the cumulative test and development hours needed for an instantaneous MTBF goal of 500 hours. | ||
[[Image:rga4.13.png | [[Image:rga4.13.png|center|450px]]</li> | ||
<li>The figure below shows the cumulative test and development hours needed for a cumulative MTBF goal of 500 hours. | <li>The figure below shows the cumulative test and development hours needed for a cumulative MTBF goal of 500 hours. | ||
[[Image:rga4.14.png | [[Image:rga4.14.png|center|450px]]</li> | ||
</ol> | </ol> | ||
Revision as of 22:18, 2 June 2014
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This example appears in the Reliability Growth and Repairable System Analysis Reference.
A prototype of a system was tested with design changes incorporated during the test. A total of 12 failures occurred. The data set is given in the following table.
| Failure Number | Cumulative Test Time(hours) |
|---|---|
| 1 | 80 |
| 2 | 175 |
| 3 | 265 |
| 4 | 400 |
| 5 | 590 |
| 6 | 1100 |
| 7 | 1650 |
| 8 | 2010 |
| 9 | 2400 |
| 10 | 3380 |
| 11 | 5100 |
| 12 | 6400 |
Do the following:
- Estimate the Duane parameters.
- Plot the cumulative and instantaneous MTBF curves.
- How many cumulative test and development hours are required to meet an instantaneous MTBF goal of 500 hours?
- How many cumulative test and development hours are required to meet a cumulative MTBF goal of 500 hours?
Solution
- The next figure shows the data entered into RGA along with the estimated Duane parameters.
- The following figure shows the cumulative and instantaneous MTBF curves.
- The next figure shows the cumulative test and development hours needed for an instantaneous MTBF goal of 500 hours.
- The figure below shows the cumulative test and development hours needed for a cumulative MTBF goal of 500 hours.
