A Fast Modeling Technique for the Vertical Train-Track-Bridge Interactions

Table 2

The case table.

Case number	1	2	3	4	5	6	7	9
Displacement correction	✕	✓	✓	✓	✓	✓	✓	✓
Nonlinear second suspension	✕	✕	✓	✓	✓	✓	✓	✓
Track irregularity	✕	✕	✕	✕	✓	✓	✓	✓
Tabas earthquake	✕	✕	✕	✕	✓	✓	✓	✓
Intensity (g)/Comments			Damper	Spring	0.05 g	0.10 g	0.20 g	0.40 g

Note. ✕ means not to consider the item, and ✓ means to consider the item. Case 3 considers the second nonlinear damper, and case 4 considers the second nonlinear spring.