Stochastic Analysis of Nonlinear Vehicle-Track Coupled Dynamic System and Its Application in Vehicle Operation Safety Evaluation

Table 2

Vehicle dynamics parameters.

Item		Notation	Unit	Value
Car body	Mass	mc	kg	33.2 × 10^3
	Mass moment of inertia about x-axis	Ixc	kg·m^2	1.07568 × 10^5
	Mass moment of inertia about y-axis	Iyc	Kg·m^2	1.6268 × 10^6
	Mass moment of inertia about z-axis	Izc	kg·m^2	1.4027 × 10^6
Bogie	Mass of bogie	mt	kg	2.6 × 10^3
	Mass moment of inertia about x-axis	Ixt	kg·m^2	2106
	Mass moment of inertia about y-axis	Iyt	kg·m^2	1424
	Mass moment of inertia about z-axis	Izt	kg·m^2	2600
Wheelset	Mass of wheelset		kg	1.97 × 10^3
	Mass moment of inertia about x-axis		kg·m^2	623
	Mass moment of inertia about y-axis		kg·m^2	78
	Mass moment of inertia about z-axis		kg·m^2	623
Primary suspension system	Longitudinal spring stiffness	kpx	N/m	9.8 × 10^6
	Lateral spring stiffness	kpy	N/m	9.8 × 10^6
	Vertical spring stiffness	kpz	N/m	1.176 × 10^6
	Longitudinal damping coefficient	cpx	N·s/m	0
	Lateral damping coefficient	cpy	N·s/m	0
	Vertical damping coefficient	cpz	N·s/m	0.196 × 10^3
Second suspension system	Longitudinal spring stiffness	ksx	N/m	1.784 × 10^5
	Lateral spring stiffness	ksy	N/m	1.931 × 10^5
	Vertical spring stiffness	ksz	N/m	1.931 × 10^5
	Longitudinal damping coefficient	csx	N·s/m	0
	Lateral damping coefficient	csy	N·s/m	5.88 × 10^4
	Vertical damping coefficient	csz	N·s/m	9.8 × 10^4
Half the transverse distance between vertical primary suspension systems		dwk	m	1.0
Half the transverse distance between vertical primary suspension system absorber		dwc	m	1.0
Half the transverse distance between vertical second suspension systems		dsk	m	1.25
Half the transverse distance between vertical second suspension systems absorber		dsc	m	1.25
Vertical distance between center of gravity of car body and lateral secondary suspension system		Hcb	m	0.644
Vertical distance between lateral secondary suspension system and center of gravity of bogie		Hbt	m	0.29
Vertical distance between center of gravity of bogie and lateral primary suspension system		Htw	m	0.08
Half the longitudinal distance between center of rear bogie and center of front bogie		Lc	m	8.75
Half the bogie axle base		Lt	m	1.25