基于D-S的IBBA下的故障诊断研究

Research on diagnosis method with IBBA based on D-S

在导弹武器等复杂系统的D-S故障诊断中,因为影响基本置信分配值的因素增多,诊断领域专家有时只能给出基本置信分配值的某一范围或者某一模糊值。针对这种情况,提出了一种复杂系统的D-S故障诊断方法。首先根据诊断领域专家的诊断知识和经验,结合D-S证据理论的决策方法,给出一种基于不定基本置信分配的故障决策方法。然后根据D-S故障诊断的目的,在D-S证据理论的基础上,利用优化理论,提出一种不定基本置信分配下的D-S诊断方法,阐述了原理,构建了目标函数,给出了约束函数。最后,通过几组示例验证了所给出的故障决策方法和D-S诊断方法的合理性。

In fault diagnosis with D-S for a complex system, such as practical missiles and weapon systems, sometimes the result provided by perts in this field is only some range of the impersonal value or some fuzzy value of basic belief assignment because of the increasing factors that affect basic belief assignment. This paper puts forward a kind of fault diagnosis method with D-S for a complex system. First, a fault decision-making method with IBBA is given according to the diagnosis knowledge and experience of experts in this field that is combined with the decision making method of I^S evidence theory. Then according to the purpose of fault diagnosis, a diagnosis method with DS based on IBBA is introduced with the use of optimization theory. The principle of which is elaborated and the object function and constrain function are also constructed. Finally, some examples prove the ration ality of the proposed fault decision making method and diagnosis method with D-S.