Operational Testing Example
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This example appears in the Reliability Growth and Repairable System Analysis Reference.
Consider two systems are placed into operational testing. The data for each system is given below. Do the following:
- After estimating the parameters, verify the assumption of [math]\displaystyle{ \beta = 1\,\! }[/math].
- Estimate the demonstrated MTBF of the system.
- What is the projected MTBF if the delayed fixes are to be implemented?
- What is the growth potential of the system?
| System # | 1 | 2 |
| Start Time (Hr) | 0 | 0 |
| End Time (Hr) | 504 | 541 |
| Failure Times (Hr) | 21 BD43 | 83 BD37 |
| 29 A42 | 83 BD43 | |
| 43 BD10 | 83 BD46 | |
| 43 BD11 | 169 A45 | |
| 43 A39 | 213 A18 | |
| 66 A20 | 299 A42 | |
| 115 BD34 | 375 A1 | |
| 159 BD49 | 431 BD16 | |
| 199 BD47 | ||
| 202 BD47 | ||
| 222 BD47 | ||
| 248 BD14 | ||
| 248 BD15 | ||
| 255 BD41 | ||
| 286 BD40 | ||
| 286 BD48 | ||
| 304 BD47 | ||
| 320 BD13 | ||
| 348 BD11 | ||
| 364 BD44 | ||
| 404 BD44 | ||
| 410 BD4 | ||
| 429 BD47 |
The BD modes are implemented at the end of the test and assume a fixed effectiveness factor equal to 0.6.