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In order to explore the influence of the traction motor distribution on the dynamic characteristics of rack vehicle and gear-rack meshing characteristics，the vehicle dynamics characteristics under different traction motor layout modes are analyzed with the consideration of the gear-rack nonlinear meshing behavior and dynamic time-varying excitation and the wheel-rail nonlinear contact relationship. Based on the Strub system，the coupling dynamics model of rack vehicles is established. The influence of three different motor forms on the dynamic characteristics is studied. On this basis，the layout mode suitable for rack vehicles is proposed.The research shows the gear meshing force and the vertical and longitudinal vibration acceleration are smaller under the dual-mounted traction motor conditions. When the motor is dual-mounted，the meshing force is about 50% of that the motor is rear-mounted and front-mounted. The maximum amplitude difference of the vertical and longitudinal acceleration of the gear is 4.04 m·s-2 and 6.01 m·s-2 in the straight section. When the motor is rear-mounted the gear vibration acceleration is the largest，and the vertical and longitudinal acceleration amplitudes are 45% larger than the dual-mounted traction motor conditions in the climbing section. The comfort of rack vehicle is better when the motor rear and front-mounted on the straight line，but the dual-mounted is better in the climbing section. In view of the fact that rack vehicle is mainly used in climbing lines，and the dynamic characteristics of rack vehicle with dual-mounted are the best when climbing. Thus，it is recommended that the dual-mounted is the optimal layout mode.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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