Research Article

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

Table 2

Model parameters used in Example 2.

ParameterTrueInitial guessEstimatedAbsolute error
UKFCUKF1CUKF2UKFCUKF1CUKF2

(%)23−3.483.682.785.481.680.78
(rad/s)22.4−4.206.286.3310.480.000.05
()91033.945.2524.943.75
()22.5−2.524.644.522.64
()43.50.132.193.871.81
(—)1.210.961.500.300.24

These values are undefined because they are constrained by equality constraints.