Tribological Performance Optimization of Al-7.5% SiCp Composites Using the Taguchi Method and Grey Relational Analysis

Table 4

Computation of Grey Relational Grade.

Exp. no.	Experimental data		Normalized data		Value of Δ		Grey relational coefficient		Grey relational grade
	COF	Wear (µm)	Normalized COF	Normalized WEAR	Δ value COF	Δ value WEAR	ξ value COF	ξ value WEAR
1	0.341	60.07	0.7529	0.8439	0.2471	0.1561	0.6693	0.7621	0.7157
2	0.321	71.84	0.8706	0.6590	0.1294	0.3410	0.7944	0.5945	0.6944
3	0.387	85.24	0.4824	0.4484	0.5176	0.5516	0.4913	0.4755	0.4834
4	0.323	79.44	0.8588	0.5395	0.1412	0.4605	0.7798	0.5206	0.6502
5	0.373	94.89	0.5647	0.2967	0.4353	0.7033	0.5346	0.4155	0.4751
6	0.303	107.9	0.9765	0.0923	0.0235	0.9077	0.9551	0.3552	0.6551
7	0.316	50.14	0.9000	1.0000	0.1000	0.0000	0.8333	1.0000	0.9167
8	0.348	69.63	0.7118	0.6937	0.2882	0.3063	0.6343	0.6201	0.6272
9	0.312	86.03	0.9235	0.4360	0.0765	0.5640	0.8673	0.4699	0.6686
10	0.396	50.63	0.4294	0.9923	0.5706	0.0077	0.4670	0.9848	0.7259
11	0.469	61.39	0.0000	0.8232	1.0000	0.1768	0.3333	0.7388	0.5361
12	0.462	77.16	0.0412	0.5754	0.9588	0.4246	0.3427	0.5407	0.4417
13	0.397	64.45	0.4235	0.7751	0.5765	0.2249	0.4645	0.6898	0.5771
14	0.439	82.24	0.1765	0.4955	0.8235	0.5045	0.3778	0.4978	0.4378
15	0.456	96.24	0.0765	0.2755	0.9235	0.7245	0.3512	0.4083	0.3798
16	0.299	71.07	1.0000	0.6711	0.0000	0.3289	1.0000	0.6032	0.8016
17	0.308	89.68	0.9471	0.3786	0.0529	0.6214	0.9043	0.4459	0.6751
18	0.336	106.2	0.7824	0.1190	0.2176	0.8810	0.6967	0.3620	0.5294
19	0.383	57.24	0.5059	0.8884	0.4941	0.1116	0.5030	0.8176	0.6603
20	0.409	67.93	0.3529	0.7204	0.6471	0.2796	0.4359	0.6414	0.5386
21	0.419	83.21	0.2941	0.4803	0.7059	0.5197	0.4146	0.4903	0.4525
22	0.387	59.24	0.4824	0.8570	0.5176	0.1430	0.4913	0.7776	0.6345
23	0.452	67.93	0.1000	0.7204	0.9000	0.2796	0.3571	0.6414	0.4993
24	0.409	83.21	0.3529	0.4803	0.6471	0.5197	0.4359	0.4903	0.4631
25	0.363	65.58	0.6235	0.7573	0.3765	0.2427	0.5705	0.6733	0.6219
26	0.395	89.09	0.4353	0.3879	0.5647	0.6121	0.4696	0.4496	0.4596
27	0.334	113.77	0.7941	0.0000	0.2059	1.0000	0.7083	0.3333	0.5208