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利用Petri网特征结构的故障诊断方法

DOI: 10.11830/ISSN.1000-5013.2014.04.0378, PP. 378-382

Keywords: 故障诊断,Petri网,库所不变量,故障函数

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Abstract:

为解决大规模复杂系统故障诊断中计算复杂性高的问题,提出一种基于Petri网的在线故障诊断方法.首先,建立诊断对象的规范Petri网模型;其次,提出模型的严格最小库所不变量和特征库所不变量集合,并借助特征库所不变量集合描述Petri网模型的结构信息;最后,基于特征库所不变量集合提出任意当前标识的故障函数,并利用故障诊断函数完成故障识别和定位.结果表明:该故障诊断方法采用了系统结构信息,无需遍历系统状态空间,具有多项式级的计算复杂性,能够满足实时性要求.

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