基于改进型可信度理论的凝汽器故障诊断模型研究

针对凝汽器故障及征兆间存在着的模糊关系及现有凝汽器故障诊断模型存在的不足,研究并设计了一个基于可信度理论的故障诊断模型,将可信度推理处理不确定关系的优点应用于凝汽器故障诊断之中。通过对征兆的表达、不确定算法的构建、可信度传递等问题的描述探讨,提出了更为合理的征兆表达方式及转换数学方程,为征兆的准确获取提供了依据;同时改进了规则可信度的设定方法,使可信度推理更接近于人类专家思维。实例证明,该模型能很好地适应凝汽器故障诊断的需要。

Research of the fault diagnosis model for condenser based on improved confidence theory

In order to deal with the fuzzy relation between condenser faults and its symptoms and overcome the disadvantages of existing fault diagnosis models,this paper studied and constructed a fault diagnosis model based on confidence,applying the merits of credibility reasoning to the condenser fault diagnosis.By discussing the way of knowledge expression,the set-up of uncertainly algorithm and the transfer of credibility,this paper put forward a more reasonable way of symptoms expression and converted mathematics equation,which provide the basis for obtaining symptoms accurately.The setting method of rule confidence was also improved,and it made reasoning model closer to human experts thinking.Experiment results show that the proposed model well adapt to the demand of condenser fault diagnosis.