基于多指标融合的故障诊断理论与方法

Theory and Method of Faults Diagnosis Based on Multi index Fusing

运用嵌入约束方法，对故障诊断中的多指标信息融合问题作了统一的数学描述，系统地研究多指标诊断的信息理论、故障的可诊断性检验、诊断指标的筛选以及基于Ｂａｙｅｓ方法的诊断模型等，并将其应用于内燃机活塞缸套磨损故障的诊断，取得了预期的效果。

Using information theory and multivariate statistical theory, the theory and method of faults diagnosis based on multi index fusion are described mathematically, including the information theory of multi index diagnosis, test on possibility of fault diagnosis, selection of diagnosis index, Bayesion diagnosis modeling and so on. The methods are applicable not only in single sensor but also in multi sensor case. As an application, the diagnosis of I.C.engine piston liner wear condition is studied, including the test on possibility of diagnosis, selection of index, diagnosis modeling and so on. A practical diagnosis example is given, and the predictable effectiveness is achieved.