The Impact of Wheel Flat on Traction Drive System of Electric Locomotives

Table 2

Parameters of the vehicle system.

Parameter	Value
Car body mass (kg)	6.26 × 10^4
Bogie mass (kg)	7.84 × 10^3
Wheelset mass (kg)	2.77 × 10^3
Motor mass (kg)	2.66 × 10^3
Mass moment of inertia of car body (kg · m^2)	1.434 × 10^6
Mass moment of inertia of bogie frame (kg · m^2)	1.311 × 10^4
Mass moment of inertia of wheelset (kg · m^2)	4.2 × 10^2
Mass moment of inertia of motor (kg · m^2)	2 × 10^2
Stiffness of primary suspension (N/m)	3.14 × 10^6
Stiffness of secondary suspension (N/m)	2.14 × 10^6
Stiffness of suspension connecting motor and bogie frame (N/m)	1.0 × 10^10
Stiffness of axle-hung bearing supporting motor on wheel axle (N/m)	1.0 × 10^10
Damping coefficient of primary suspension (N s/m)	5 × 10^4
Damping coefficient of suspension connecting motor and bogie frame (N s/m)	9 × 10^4
Damping coefficient of secondary suspension (N s/m)	1.0 × 10^3
Damping coefficient of axle-hung bearing supporting motor on wheel axle (N s/m)	1.0 × 10^3
Semi-longitudinal distance between bogies (m)	5.03
Semi-longitudinal distance between wheelsets in bogie (m)	1.3
The longitudinal distance between bogie center and hung position of motor on bogie (m)	0.374
Longitudinal distance between pinion center and hung position of motor on bogie (m)	0.35
Distance between centers of pinion and gear (m)	0.576
Wheel radius (m)	0.625