Research Article
Experimental and Numerical Investigation into Formation of Metro Wheel Polygonalization
Table 1
Parameter values of the track and vehicle subsystems.
| | Parameters | Value |
| | Track subsystem | | Young’s modulus of rail (N/m2) | 2.059 × 1011 | | Shear modulus of rail (N/m2) | 7.9 × 1010 | | Density of rail (N/m2) | 7860 | | Cross-sectional area (m2) | 7.745 × 10−3 | | Bending moment about y-axis (m4) | 3.217 × 10−5 | | Vertical shear coefficient | 0.5329 | | Density of slab (kg/m3) | 2800 | | Young’s modulus of slab (N/m2) | 3.6 × 1010 | | Rail pad vertical stiffness (MN/m) | 55 | | Rail pad vertical damping (kN·s/m) | 10 | | Slab support vertical stiffness (MN/m) | 2860 | | Slab support vertical damping (kN·s/m) | 300 | | Sleeper spacing (m) | 0.6 | | Vehicle subsystem | | Car body mass (kg) | 36,632 | | Bogie mass (kg) | 1800 | | Wheelset mass (kg) | 1520 | | Car body pitch moment of inertia (kg · m2) | 1,184,990 | | Bogie pitch moment of inertia (kg · m2) | 1474 | | Secondary suspension vertical stiffness (MN/m) | 0.45 | | Secondary suspension vertical damping (kN · s/m) | 60 | | Primary suspension vertical stiffness (MN/m) | 1.32 | | Primary suspension vertical damping (kN · s/m) | 1.32 | | Wheel radius (m) | 0.42 | | Half distance between two bogie frames (m) | 6.3 | | Half of the bogie wheelbase (m) | 1.1 |
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