Output-Only Modal Analysis Based on Improved Empirical Mode Decomposition Method

Table 1

The comparison of the modal parameters obtained from different algorithms.

	fem	PP	SSI-cov		Std. EMD-RDT		Improved EMD
Mode							with RDT		with SSI-cov
	(Hz)	(Hz)	(Hz)	(%)	(Hz)	(%)	(Hz)	(%)	(Hz)	(%)
1st ↔	0.662	0.58	0.583	2.74	0.530	7.41	0.530	3.12	0.583	2.28
2nd ↔	0.789	0.71	0.721	3.63	0.714	7.23	0.714	2.85	0.716	3.52
3rd ↔	1.137	0.89	0.914	3.91	n/a	n/a	0.916	1.96	0.915	4.33
1st ↕	1.333	1.32	1.302	1.54	1.319	1.28	1.331	1.68	1.325	2.48
4th ↔	1.570	1.50	1.481/1.508	1.65/1.26	1.505	2.84	1.509	1.37	1.512	1.03
2nd ↕	1.975	2.09	1.996	4.82	2.097	0.83	1.99	4.23	1.983	3.68

Note: denotes lateral bending mode; denotes vertical bending mode; n/a: not a number.