High-Frequency Vibration Analysis and Optimization of Irregular Wear of Pantograph Carbon Strips

Table 3

Modal parameters of vertical and transverse modes.

Mode	Frequency (Hz)/vertical	Damping ratio (%)/vertical	Frequency (Hz)/transverse	Damping ratio (%)/transverse
First	63.7	1.426	120.2	1.127
Second	137.5	0.532	152.6	0.332
Third	236.5	0.782	399.9	0.519
Fourth	386.7	1.652	706.8	1.074
Fifth	582.9	1.571	783.5	1.253
Sixth	807.3	0.580	1145.5	0.462