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

Table 3

Energy of the motor 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)	0.3	1.36	3.36	0.49	0.36	0.24	0.07	0.14
	Percentage (%)	4.81	21.44	53.12	7.71	5.72	3.84	1.15	2.21
Case 2	Energy (m^2/s^3)	1.59	7.81	15.61	1.49	1.32	0.78	0.37	0.3
	Percentage (%)	5.43	26.70	53.32	5.09	4.49	2.68	1.26	1.03
Case 3	Energy (m^2/s^3)	0.24	1.01	2.42	1.14	0.78	1.24	0.23	0.39
	Percentage (%)	3.2	13.59	32.39	15.33	10.46	16.69	3.08	5.26