摘要
离散事件系统的间歇性故障诊断能够将系统中发生的间歇性故障及时诊断出来,但在诊断期间的系统可能会执行不安全操作.针对间歇性故障在诊断期间的安全性问题,提出一种基于事件的安全诊断方法.首先对发生间歇性故障的离散事件系统进行建模,并给出系统间歇性故障的安全可诊断性的形式化定义.然后通过构造非法语言识别器对系统的非法操作进行识别,并在此基础上构建一个安全验证器,由此得到一个关于系统间歇性故障安全可诊断性的充分必要条件,实现离散事件系统对间歇性故障的安全诊断.这种安全诊断既保证了间歇性故障一旦发生即能被及时诊断出来,又确保了在故障诊断期间系统不会执行任何不安全操作.
Intermittent faults diagnosis of discrete event systems(DES)can detect intermittent faults in the system in time,but the system may execute unsafe operation during the fault detection.An approach for safe diagnosability is proposed for intermittent faults of DESs.Firstly,the system with intermittent faults is modeled,and the notion of safe diagnosability for intermittents faults of DESs is formalized.Then we construct the recognizer of illegal language to identify the sequences of the forbidden operations.Based on the recognizer,the safe verifier is constructed.In particular,a necessary and sufficient condition of safe diagnosability for intermittent faults of DESs is proposed and a safe diagnosis of intermittent faults is achieved.It is guaranteed that not only each intermittent fault occurring in safe diagnosable DESs can be detected in time,but also the system does not execute any unsafe operation during the fault detection.
作者
刘富春
唐顺桥
赵锐
邓秀勤
崔洪刚
LIU Fu-chun;TANG Shun-qiao;ZHAO Rui;DENG Xiu-qin;CUI Hong-gang(School of Computers,Guangdong University of Technology,Guangzhou 510006,China;School of Applied Mathematics,Guangdong University of Technology,Guangzhou 510006,China;Science and Technology Innovation Center of Dongyuan,Heyuan 517500,China)
出处
《控制与决策》
EI
CSCD
北大核心
2020年第5期1205-1210,共6页
Control and Decision
基金
国家自然科学基金项目(61673122)
广东省自然科学基金项目(2019A1515010548)
广东省公益研究与能力建设专项资金项目(2015A030402006)
广东工业大学计算机学院重大奖项培育项目(2016PY01)。
关键词
离散事件系统
间歇性故障
故障诊断
安全诊断
识别器
验证器
discrete-event systems
intermittent faults
fault diagnosis
safe diagnosability
recognizer
verifier
