Optimization of Dual Coating Using Electroless Ni-P-Nano-TiO₂ and Plasma Yttria-Stabilized Zirconia on Piston Crown and Cylinder Liner in CI Engine

Table 6

Calculating the grey relational coefficient.

Converting normalized value into			Calculating Grey relational coefficient Gklm
Thickness	Thermal resistance	Surface roughness	Thickness	Thermal resistance	Surface roughness
1.000	1.000	2.000	0.333	0.333	0.200
0.865	0.898	1.870	0.366	0.358	0.211
0.742	0.949	1.749	0.403	0.345	0.222
0.282	0.553	1.335	0.639	0.475	0.272
0.327	0.364	1.479	0.605	0.579	0.253
0.238	0.458	1.749	0.677	0.522	0.222
0.000	0.225	1.000	1.000	0.689	0.333
0.037	0.000	1.039	0.931	1.000	0.325
0.075	0.089	1.118	0.869	0.849	0.309