Vertical Random Vibration Analysis of Track-Subgrade Coupled System in High Speed Railway with Pseudoexcitation Method

Table 1

Degrees of freedom of the system model.

System component	Type of motion
	Vertical	Pitch
Wheelset 1
Wheelset 2
Wheelset 3
Wheelset 4
Front bogie frame
Real bogie frame
Car body
Rail		—
Slab		—
Subgrade		—