Kriging Metamodeling in Rotordynamics: Application for Predicting Critical Speeds and Vibrations of a Flexible Rotor

Table 19

Relative generalization error on the variance of the critical speeds for different regression orders and correlation functions. Symmetric case with 120 samples.

	Gaussian	Linear	Exponential	Cubic
Zero-order regression
	1.74	8.31	3.74
	1.26	2.22	1.66
	6.69 10^−2	7.33	6.82
	4.06	5.84	5.24
	8.05	1.47	1.12
	1.41	3.18	2.97
	2.23	7.50	2.42
	1.73	4.03	3.41
First-order regression
	1.79	2.08	1.96
	1.17	1.23	1.23
	6.82	6.90	6.87
	3.98	4.02	4.16
	8.04	8.56	8.46
	1.41	2.91	2.28
	2.13	5.01	3.63
	9.72	3.21	2.24
Second-order regression
	1.71	1.67 10^−3	1.72
		1.15 10^−2	1.16	1.16
	7.00		7.06	7.07
	3.82	3.81 10^−2		3.86
	8.04	7.98 10^−3	8.09
	1.41 10^−5	1.80	1.88
	2.11	2.11	2.09 10^−5
	9.70 10^−8	6.38	5.76