Numerical and Experimental Investigation on Parameter Identification of Time-Varying Dynamical System Using Hilbert Transform and Empirical Mode Decomposition

Table 4

Identified natural frequency damping ratio of the 12-story building model.

Case	Natural frequency	Damping ratio	Frequency reduction
Initial state	5.127	0.0352	0%
Case 1	4.883	0.0405	−4.76%
Case 2	2.930	0.0628	−42.85%
Case 3	2.441	0.1106	−52.39%