Evaluating the Effect of Modelling Errors in Load Identification Using Classical Identification Methods

Table 1

Error standard deviation for different levels of uncertainty and for three selected points in time. All are based on the force estimate in DOF 3.

Uncertainties introduced	Method 1			Method 2
	Error std (%)			Error std (%)
	a	b	c	a	b	c
Natural frequencies	2.73	2.29	2.13	6.08	4.39	3.64
Natural frequencies and damping ratios	3.28	2.31	2.12	7.67	4.45	3.64
Natural frequencies, damping ratios, and mode shapes	53.1	46.3	36.9	7.96	4.94	4.10