Dynamic Responses of the Metro Train’s Bogie Frames: Field Tests and Data Analysis

Table 4

Energy of the trailer bogie frame at each decomposition level and its percentage of the total energy in respect of different cases.

Test case	Brand	1	2	3	4	5	6	7	8
	Frequency range (Hz)	125–250	62.5–125	31.25–62.5	15.63–31.25	7.81–15.63	3.91–7.81	1.96–3.91	0.98–1.96
Case 1	Energy (m^2/s^3)	0.43	1.83	4.25	1.52	1.26	0.68	0.36	0.18
	Percentage (%)	4.07	17.4	40.45	14.46	12.02	6.43	3.41	1.76
Case 2	Energy (m^2/s^3)	0.94	3.25	6.52	2.86	1.82	1.27	0.32	0.16
	Percentage (%)	5.46	18.96	38.04	16.67	10.61	7.44	1.86	0.95
Case 3	Energy (m^2/s^3)	0.76	3.03	3.82	1.59	0.98	0.56	0.35	0.08
	Percentage (%)	6.8	27.14	34.17	14.27	8.83	5.02	3.09	0.68