Research Article
Design of Testing Period for Reliability Assessment of Numerical Control Machine Tools Considering Working Conditions
Table 2
The curves fitted to the upper limit or the lower limit of MTBF interval estimation under different covariates.
| Covariates | The curves fitted to the upper limit of MTBF interval estimation | | The curves fitted to the lower limit of MTBF interval estimation | | Fc(KN) | Nh(n/h) |
| 0.35 | 2 | | 0.9567 | | 0.9791 | 0.43 | 17 | | 0.9711 | | 0.9869 | 0.54 | 4 | | 0.9785 | | 0.9813 | 0.78 | 10 | | 0.9804 | | 0.9835 | 0.81 | 4 | | 0.9895 | | 0.9815 | 0.84 | 6 | | 0.9879 | | 0.9830 | 1.03 | 14 | | 0.9766 | | 0.9667 | The method in [1] | | 0.9796 | | 0.9846 |
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