Application of Hilbert-Huang Transform in Structural Health Monitoring: A State-of-the-Art Review

Table 1

Comparison on modal identification of a shear building with light appendage.

	Damped frequency (Hz)			Damping ratio
	Theoretical value (Hz)	FFT	HHT	Theoretical value	Bandwidth method	HHT
Mode1	0.1836	0.1892	0.1838	1%	1.23%	1.01%
Mode2	0.1956	0.1953	0.1936	1%	1.52%	1.13%
Mode3	0.5419	0.5416	0.5505	1%	1.80%	1.09%
Mode4	0.5727	0.5722	0.5706	1%	1.86%	1.07%