论文部分内容阅读
门限选择是控制系统中故障检测的一个关键问题。门限设置过高,故障的失报率就会增大。门限设置过低,故障的误报率又会增大。因此,合理地选择门限,可使故障的误报率和失报率在一定条件下保持相对稳定。一个长时间运行的系统,其可靠性随着时间的增长而下降,故障发生的可能性也增大。在故障检测过程中,为了不使故障的失报率和误报率发生明显的变化,应适当地调节故障检测的门限,以跟踪系统可靠性的变化。
Threshold selection is a key issue in the control system for fault detection. Threshold setting is too high, the failure rate will increase. Threshold setting is too low, false alarm rate of failure will increase. Therefore, choosing the threshold reasonably can make the false positive rate and the false negative rate keep relatively stable under certain conditions. A long-running system whose reliability declines over time and increases the likelihood of failure. In the process of fault detection, in order not to significantly change the rate of false alarm and false alarm, the threshold of fault detection should be adjusted properly to track the change of system reliability.