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结合 FMS故障诊断与维修系统 ,利用模糊数学的有关概念和方法 ,对 FMS故障诊断与维修系统故障规则库中模糊规则的模糊前提和模糊匹配等概念进行了定义和说明 .提出了 FMS故障诊断与维修系统应采用肯定后件式的反向模糊推理形式 .给出了一种模糊隶属度函数的计算方法 ,并解决了如何确定证据的不确定性测度问题 .利用多重阈值将证据的不确定性测度隶属区间进行划分 ,并用语言变量形式将不确定性测度表示出来 .
Combined with the FMS fault diagnosis and maintenance system, the concepts and methods of fuzzy mathematics are used to define and explain the fuzzy preconditions and fuzzy matching of the fuzzy rules in the FMS fault diagnosis and maintenance system fault rules base. The FMS fault diagnosis and The maintenance system should adopt the affirmative back-piece inverse fuzzy inference form, and gives a calculation method of fuzzy membership function and solves the problem of how to determine the uncertainty measurement of evidence.Using multiple thresholds to reduce the uncertainty of evidence The measurement is subdivided into segments and the uncertainty measures are expressed in the form of linguistic variables.