Constrained Unscented Kalman Filter for Structural Identification of Bouc–Wen Hysteretic System

Table 1

Model parameters used in Example 1.

Parameter	True	Initial guess	Estimated		Absolute error
			UKF	CUKF	UKF	CUKF
(%)	2	—	—	—	—	—
(rad/s)	2	—	—	—	—	—
()	9	10	14.80	10.34	5.80	1.34
()	2	2.5	2.77	2.24	0.77	0.24
()	4	3.5	5.46	4.18	1.46	0.18
(—)	1.2	1	1.19	1.15	0.01	0.05

These parameters are presumed to be determined.