Research Article
Improvement of Adaptive GAs and Back Propagation ANNs Performance in Condition Diagnosis of Multiple Bearing System Using Grey Relational Analysis
Table 5
The GRG and sequence of features extracted.
| Number | GRG = 0.3 | GRG = 0.5 | GRG = 0.6 | GRG = 1 | Features |
| 1 | 0.912 | 0.945 | 0.954 | 0.972 | Root mean sq. value | 2 | 0.912 | 0.945 | 0.953 | 0.971 | Standard deviation | 3 | 0.909 | 0.943 | 0.952 | 0.970 | Abs. mean value | 4 | 0.868 | 0.916 | 0.929 | 0.956 | Skewness | 5 | 0.864 | 0.910 | 0.923 | 0.951 | Max peak value | 6 | 0.761 | 0.833 | 0.855 | 0.907 | Shape factor | 7 | 0.746 | 0.830 | 0.854 | 0.904 | Kurtosis | 8 | 0.480 | 0.604 | 0.646 | 0.752 | Crest factor | 9 | 0.412 | 0.536 | 0.580 | 0.695 | Impulse factor | 10 | 0.367 | 0.488 | 0.532 | 0.652 | Clearance factor |
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