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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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任务可靠性反映武器系统在规定的任务时间和维修保障条件下完成规定作战或训练任务的能力,因此对于评价武器系统的综合效能具有重要意义.将概率模型检验技术引入到复杂武器系统的任务可靠性评估过程中,以某型弹炮结合武器系统为例,建立基于进程代数语言的系统演化过程描述模型:在此基础上,通过连续随机逻辑语言给出任务可靠度、任务可用度、任务效能等多种评价指标的形式化描述公式,借助概率模型检验器实现评价指标的自动计算.该方法能够有效地简化复杂武器系统任务可靠性的评估建模过程和各种评价指标的推导计算过程,并且在求解过程中自动地应用多种优化技术,大幅度提高计算效率.与传统的分析计算方法相比,该方法更适于在工程实践中应用. 相似文献
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