Optimization for Tribological Properties of Glass Fiber-Reinforced PTFE Composites with Grey Relational Analysis

Table 5

Calculated grey relational coefficient of all responses and grey relational grade with weightage.

Number of experiment	Weighting factor
	0.5	0.5	Total = 1
	⁢Grey relational coefficient		Overall grey relational grade
	Wear	COF
1	0.6548	0.4983	0.5765
2	0.8541	0.4410	0.6475
3	0.9161	0.3333	0.6247
4	0.9146	0.4378	0.6762
5	1.0000	0.3517	0.6759
6	0.4324	0.4536	0.4430
7	0.8628	0.3607	0.6118
8	0.6305	0.4587	0.5446
9	0.8510	0.4174	0.6342
10	0.9472	0.5891	0.7681
11	0.9315	0.4433	0.6874
12	0.3333	0.6725	0.5029
13	0.9994	0.4576	0.7285
14	0.4857	0.7792	0.6325
15	0.7766	0.5527	0.6646
16	0.7309	0.6498	0.6904
17	0.9142	0.5750	0.7446
18	0.9956	0.4353	0.7155
19	0.9526	0.6255	0.7890
20	0.3645	0.9344	0.6494
21	0.6201	0.8179	0.7190
22	0.5498	1.0000	0.7749
23	0.8443	0.8677	0.8560
24	0.8290	0.5846	0.7068
25	0.9932	0.9247	0.9589
26	0.9787	0.6096	0.7942
27	0.4697	0.8995	0.6846