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

Table 10

Relative generalization error on the mean of the amplitude for different regression orders and correlation functions. Nonsymmetric case with 600 samples.

	Gaussian	Linear	Exponential	Cubic
Zero-order regression
		6.52	6.07	8.43
		2.15	1.39	6.37
	1.11		1.18	5.12
	1.78		1.25	7.05
	1.08	1.10	5.58
	3.45 10^−3		4.26	4.05
	5.31	9.27	4.43
	2.48	1.27	1.09
First-order regression
		7.35	5.95	7.86
		1.68	1.42	2.84
	6.34	1.01		3.41
		1.24	1.15	6.14
	9.78	6.48	4.08
	3.08	4.15		1.50
	4.14	2.34	1.12
	1.04	1.60		6.54
Second-order regression
		5.96	5.55 10^−2	6.97
		1.42	1.22 10^−3	1.69
		9.73	9.22	3.28 10^−3
		9.31	1.09	5.66 10^−3
	2.25		3.24	1.52 10^−4
	1.78	2.69		1.35 10^−3
	9.76		9.68	7.95 10^−5
	6.10	1.00		5.22 10^−4