Numerical Investigation into the Critical Speed and Frequency of the Hunting Motion in Railway Vehicle System

Table 2

Notation

Parameter

Value

Unit

Car body mass

28000

kg

Bogie frame mass

3000

kg

Wheelset mass

2400

kg

Roll moment of inertia of car body

84560

kg·m^{2}

Yaw moment of inertia of car body

1102730

kg·m^{2}

Roll moment of inertia of bogie frame

2106

kg·m^{2}

Yaw moment of inertia of bogie frame

2600

kg·m^{2}

Yaw moment of inertia of wheelset

1029

kg·m^{2}

Longitudinal stiffness of primary suspension

85

MN/m

Lateral stiffness of primary suspension

15

MN/m

Vertical stiffness of primary suspension

1.1

MN/m

Longitudinal stiffness of secondary suspension

0.2

MN/m

Lateral stiffness of secondary suspension

0.2

MN/m

Vertical stiffness of second suspension

0.2

MN/m

Lateral damping of primary suspension

10

kN·s/m

Vertical damping of primary suspension

20

kN·s/m

Lateral damping of secondary suspension

30

kN·s/m

Vertical damping of secondary suspension

10

kN·s/m

Series stiffness of yaw damper

10

MN/m

First stage damping of yaw damper

300

kN·s/m

Second stage damping of yaw damper

20

kN·s/m

Blow-off force of yaw damper

3000

N

Blow-off velocity of yaw damper

0.01

m/s

Half of track gauge

0.7465

m

Half of primary spring arm

1

m

Half of secondary spring arm

1.23

m

Half of secondary vertical damping arm

1.323

m

Half of yaw damper arm

1.35

m

Vertical distance from car body center of gravity to secondary suspension

0.852

m

Vertical distance from car body center of gravity to secondary lateral damping

0.97

m

Vertical distance from bogie frame center of gravity to secondary suspension

0.162

m

Vertical distance from bogie frame center of gravity to wheelset center

0.148

m

Vertical distance from bogie frame center of gravity to secondary lateral damping

0.044

m

Longitudinal distance from bogie frame center to car body center

8.75

m

Half of wheelbase

1.25

m

Longitudinal creep force coefficient

8.4

MN

Lateral creep force coefficient

8.4

MN

Lateral/spin creep force coefficient

3000

N·m^{2}

Spin creep force coefficient

16

N

Axle load

10900

kg

Normal force acting on wheelset

53410

N

Coefficient of friction

0.3

—

Acceleration of gravity

9.8

m/s^{2}

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