对于安全性和舒适性的评价，两个定量的标准是脱轨系数和平稳性指标。
Derail coefficient and ride quality are two quantitative standards for evaluating safety and comfort of train.
用模态坐标变换法推导了用模态参数描述的车辆垂向平稳性指标计算表达式。
An expression of the vertical ride comfort index of rail vehicles was derived by modal coordinate transform and described by modal parameters.
仿真结果还发现，在转向架悬挂参数相同的情况下，单一车辆的运行平稳性指标大于列车的运行平稳性指标。
Through simulation, it is shown that ride comfort index of single car is greater than that of the whole train under the same suspension parameter of the bogie.
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