机车故障自动诊断系统中阈值的设定

Setting of threshold in automatic fault diagnosis system for locomotive

运用数理统计方法,详细分析了阈值与误报率、漏报率之间的关系,得出了保证误报率和漏报率都较低时阈值的计算方法。在机车智能故障诊断系统中的应用表明,该方法对于那些测量结果属于正态分布的参数故障阈值的设定具有指导意义。

The relationship between the threshold, mal-alarm rate and miss-alarm rate are analyzed in details by the way of mathematical statistics. It is deduced the calculation method of the threshold to ensure low rates of mal-alarm and miss-alarm. The applications to intelligent locomotive fault diagnosis system show that the method could act as a guideline for the determination of threshold with positive distribution of fault parameters.