Fault forecasting method combining intuitionistic fuzzy set with gray model

The invention relates to a fault forecasting method combining an intuitionistic fuzzy set with a gray model. The method comprises the steps of describing the operation state of a system by designing a normal subordinating degree function, an abnormal subordinating degree function, a normal intuitionistic fuzzy sub-set and an abnormal intuitionistic fuzzy sub-set; estimating the future operation state of the system by using the gray model, and thus obtaining a forecasting sequence; computing the intuitionistic fuzzy set of the forecasting sequence, and computing close degrees between the intuitionistic fuzzy set and the normal and abnormal intuitionistic fuzzy sub-sets; and compared with being close to the normal intuitionistic fuzzy sub-set, forecasting that a fault may occur when the intuitionistic fuzzy set of the forecasting sequence is closer to the abnormal intuitionistic fuzzy sub-set. The fault forecasting method of the invention can successfully achieve the early forecasting of the fault, and is an ef