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涡流检测缺陷模糊认识的新方法 总被引:2,自引:0,他引:2
针对无损检测中缺陷特征及危害程度具有某种模糊性的现象,提出用模糊逻辑来完成缺陷识别的思想。为满足在线识别自然缺陷的要求,提出了一种新的模糊聚类方法,并给出了在涡流检测中的应用结果。 相似文献
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Testability design is an effective way to realize the fault detection and isolation. Its important step is to determine testability figures of merits (TFOM). Firstly, some influence factors for TFOMs are analyzed, such as the processes of system operation, maintenance and support, fault detection and isolation and so on. Secondly, a testability requirement analysis model is built based on generalized stochastic Petri net (GSPN). Then, the system's reachable states are analyzed based on the model, a Markov chain isomorphic with Petri net is constructed, a state transition matrix is created and the system' s steady state probability is obtained. The relationship between the steady state availability and testability parameters can be revealed and reasoned. Finally, an example shows that the proposed method can determine TFOM, such as fault detection rate and fault isolation rate, effectively and reasonably. 相似文献
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复杂系统的功能角色模型是故障分析的基础 ,它可以有效地解决机内测试 (BIT)设计中的自动故障模式影响分析 (FMEA)问题 ,但目前还缺乏行之有效的构造系统功能角色模型的方法。本文从系统设计的功能信息入手 ,结合C .Lucas的层次性功能模型 ,提出了一种复合建模方法 ,比较有效地解决了这个问题。最后以某机电跟踪与稳定伺服平台为例 ,阐述了利用复合建模方法构造功能角色模型的基本过程 相似文献
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