From: Weakness Ranking Method for Subsystems of Heavy-Duty Machine Tools Based on FMECA Information
Category | Description | DDR Score | Trapezoidal fuzzy number DDR Score |
---|---|---|---|
Class I (Cannot detect) | Almost impossible to be detected | 10 | \(\widetilde{r}_{1}\) = (9, 10, 10, 10) |
Class II (Very difficult to detect) | Slight possibility of being detected | 9, 8, 7 | \(\widetilde{r}_{2}\) = (6, 7, 9, 10) |
Class III (Difficult to detect) | Can be detected on the spot or during disassembly | 6, 5, 4 | \(\widetilde{r}_{3}\) = (3, 4, 6, 7) |
Class IV (Able to detect) | Self-warning | 3, 2 | \(\widetilde{r}_{4}\) = (1, 2, 3, 4) |
Class V (Easy to detect) | Visual detection | 1 | \(\widetilde{r}_{5}\) = (1, 1, 1, 2) |