Real Time Cardan Shaft State Estimation of High-Speed Train Based on Ensemble Empirical Mode Decomposition

Table 4

The frequency characteristic of the IMFs shown in Figures 15–18.

IMF	Old shaft		New shaft
	A.I.F/Hz	D.F.F/Hz	A.I.F/Hz	D.F.F/Hz
1	4694	5252.4	5235	5360.2
2	2340	2377.9	3524	3111.3
3	1664	1401.3	2416	2302.2
4	1170	1197.1	1208	1232.9
5	598.7	601.9	624.2	755.5
6	222.2	296.9	523.6	523.5
7	172.2	176	201.3	230.2
8	89.6	68.2	93.11	105.5
9	43.1	42.2	44.89	45.3
10	19.2	18.8	33.56	36.8
11	8.7	9.9	21.44	23.7
12	4.2	5.5	9.11	9.3