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首页> 外文期刊>International Journal of Control >Detection, isolation and diagnosability analysis of intermittent faults in stochastic systems
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Detection, isolation and diagnosability analysis of intermittent faults in stochastic systems

机译：随机系统间歇性故障的检测，隔离和诊断性分析

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摘要

Intermittent faults (IFs) have the properties of unpredictability, non-determinacy, inconsistency and repeatability, switching systems between faulty and healthy status. In this paper, the fault detection and isolation (FDI) problem of IFs in a class of linear stochastic systems is investigated. For the detection and isolation of IFs, it includes: (1) to detect all the appearing time and the disappearing time of an IF; (2) to detect each appearing (disappearing) time of the IF before the subsequent disappearing (appearing) time; (3) to determine where the IFs happen. Based on the outputs of the observers we designed, a novel set of residuals is constructed by using the sliding-time window technique, and two hypothesis tests are proposed to detect all the appearing time and disappearing time of IFs. The isolation problem of IFs is also considered. Furthermore, within a statistical framework, the definition of the diagnosability of IFs is proposed, and a sufficient condition is brought forward for the diagnosability of IFs. Quantitative performance analysis results for the false alarm rate and missing detection rate are discussed, and the influences of some key parameters of the proposed scheme on performance indices such as the false alarm rate and missing detection rate are analysed rigorously. The effectiveness of the proposed scheme is illustrated via a simulation example of an unmanned helicopter longitudinal control system.
机译：间歇性故障（IFS）具有不可预测性，非确定性，不一致和可重复性的性质，在故障和健康状态之间切换系统。本文研究了一类线性随机系统中的IFS故障检测和隔离（FDI）问题。对于IFS的检测和隔离，它包括：（1）检测IF的所有出现时间和消失时间; （2）检测在随后消失之前（出现）时间之前的每个出现（消失）时间; （3）确定IFS发生在哪里。基于我们设计的观察者的输出，通过使用滑动时间窗技术构建了一种新的一组残差，并且提出了两个假设测试来检测IFS的所有出现时间和消失时间。还考虑了IFS的隔离问题。此外，在统计框架内，提出了IFS诊断性的定义，并提出了足够的条件来诊断IFS的诊断。讨论了误报率和缺失检测率的定量性能分析结果，并且严格地分析了所提出的方案的一些关键参数的影响，例如误报率和缺失检测率。通过无人直升机纵向控制系统的模拟示例说明了所提出的方案的有效性。

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