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针对故障诊断专家系统中专家知识的模糊性和不确定性，给出用模糊Ｐｅｔｒｉ网（ＦＰＮ）模型表示模糊产生式规则（ＦＰＲ）知识的方法、知识的存储、模糊推理机制及算法的实现。同时，以ＪＣＳ—０２０（ＦＡＮＵＣ）加工中心主轴伺服故障诊断为例，说明该方法在故障诊断专家系统（ＦＤＥＳ）中应用的可行性与有效性。
Aiming at the fuzziness and uncertainty of expert knowledge in fault diagnosis expert system, this paper gives a method to express knowledge of fuzzy production rules (FPR) by fuzzy Petri nets (FPN) model, storage of knowledge, fuzzy inference mechanism and algorithm implementation. At the same time, taking the spindle servo fault diagnosis of JCS-020 (FANUC) machining center as an example, the feasibility and effectiveness of this method in fault diagnosis expert system (FDES) are illustrated.