Table 1 Lists of the vehicle model's DOFs.

From: Dynamic response of axle box bearing for high-speed train considering wheelset flexibility and polygonal wear

Vehicle component

Type of motion

Longitudinal

Lateral

Vertical

Roll

Yaw

Pitch

Car body

Xc

Yc

Zc

ϕcb

ψcb

βcb

Bogie frame (i = 1,2)

Xbi

Ybi

Zbi

ϕbfi

ψbfi

βbfi

Wheelset (i = 1,2,3,4)

Xwi

Ywi

Zwi

ϕwsi

ψwsi

βwsi

Axle box (i = 1–8)

Xai

Yai

Zai

-

-

βabi

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