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所讨论的诊断方法是应用模糊推理和模糊识别理论，在判断故障产生的原因及程度两方面，进行了系统的阐述，给出了故障与征兆之间模糊关系的条件分布函数及其确定方法和模糊识别理论的数学模型．通过对牙轮钻头实验台振动诊断，结果表明该方法具有良好的可应用性、合理性和有效性
The diagnostic methods discussed are based on the theory of fuzzy reasoning and fuzzy recognition. The reasons and degree of the fault are explained systematically. The conditional distribution function of the fuzzy relation between fault and symptom and its determining method are given. Mathematical model of fuzzy recognition theory. Through the vibration test of roller cone test bench, the results show that the method has good applicability, rationality and effectiveness