Vertical Track Irregularity Influence on the Wheel High-Frequency Vibration in Wheel-Rail System

Table 2

The convergence of different contact stiffness factor.

Stiffness factor	Convergence
0.1	Easy
0.2	Normal
0.3	Easy
0.4	Easy
0.5	Normal
0.6	Normal
0.7	Easy
0.8	Normal
0.9	Hard
1.0	Hard