But it also has some problems, such as ridingindex of parameters and practicability of load model.
但是它也存在一些问题，如参数的平稳性和模型实用化问题。
2
As an example, the ridingindex of diesel locomotive type DF 9 is calculated and the results of linear and nonlinear models of the locomotive are compared.
本文以东风9内燃机车为例，分析了各种速度下的平稳性指数，并比较了线性模型和非线性模型的分析结果。
3
Riding quality is an important index of railway vehicle running behaviour.