Initial parameter | Optimal parameter | Experimental | |
Level | L2S2D2 | L3S1D3 | L3S1D3 |
Wear | 0.0042 | 0.0025 | |
COF | 0.3842 | 0.3685 | |
Grade | 0.5712 | 0.668 | 0.8694 |
Improvement of grey relational grade = 0.0968 |