Application Of Rough Set Theory To Satellite Power Diagnosis

When study Satellite fault detecting and diagnosis, the method of certainty inference was used, despite the fact that the uncertainty is a more universal phenomenon. For example, in the most parts of Satellite fault detecting and diagnosis like the acquisition of symptom information, the establishing and reduction of decision system etc. the proper inference method and error-fusion ability need to be used. The method of uncertainty inference can meet the demand of proper inference and eror-fusion ability, while the method of certainty inference could not meet the demand. It is difficult to carry on the automatic fault detecting and diagnosis of satellite by just using the method of certainty. Therefore, this dissertation based on the Pre-Research Defense Projects of"Research on longevous service and high reliability of Satellite"of the National tenth-five-year plan, study the method of uncertainty inference , and the application of rough set theory in the development of the Satellite Fault Diagnosis System,the main content of this dissertation is as follows:First, this paper incorporate the status in quo of the technology of fault detecting and diagnosis and the artificial intelligence (AI), realize the newest trend of the technology of fault detecting and diagnosis is that using the technology of artificial intelligence to solve the certainty and uncertainty problem in the actual engineering area. The main method of uncertainty inference is discussed, the advantage and disadvantage of each methods is listed and compared.In Chapter 2, the basic conception of rough set theory was introduced,including the concept of reduction, core, decision table etc. The reduction algorithm and process of decision table is described in detail. The consistent and inconsistent decision table was deal with different methoded, indiscernibility function and indiscernibility matrix was illustrated.The structure and the relation of related component of the power system of satellite was analyzed in chapter 3. The telemetry point and the corresponding channel value was also Explained, and the mathematical analysis of the fault detecting and diagnosis network is presented. The application of rough set theory...