Damage Degree Detection of Cracks in a Locomotive Gear Transmission System

Table 1

Notation used in the locomotive subsystem.

Notation	Physical meaning
	Mass of car body
	Mass moment of inertia of car body
	Mass of bogie frame
	Mass moment of inertia of bogie frame
	Mass of wheelset
	Mass moment of inertia of wheelset
	Mass of motor
	Mass moment of inertia of motor
	Angular displacement of car body/bogie frame
	Angular displacement of wheelset/motor
	Linear displacement of car body/bogie frame in vertical
	Linear displacement of wheelset/motor in vertical
	Stiffness/damping of secondary suspension
	Stiffness/damping of primary suspension
	Stiffness/damping of axle-hung bearing
	Stiffness/damping of axle-hung bearing between motor and bogie frame