运行平稳性是机车车辆的重要指标。一般而言,机车车辆运行平稳性随着速度提高而下降。为了便于设计我国高速铁路机车车辆,本文提出一种估测机车车辆运行平稳性的方法,作为机车车辆在设计过程中优化结构和方案比较的手段。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。 Operational stability is an important indicator of rolling stock. In general, locomotive running stability decreases with increasing speed. In order to facilitate the design of China’s high-speed railway rolling stock, this paper presents a method to estimate the running smoothness of rolling stock as a means to optimize the structure and scheme of the rolling stock in the design process. Taking Dongfeng 9 diesel locomotive as an example, this paper analyzes the stability indices under various speeds and compares the linear model with the nonlinear model.