A residual-knowledge-data jointly driven fault composite diagnosis method and
system, in which the first step is to construct a probability
graph model, including determining the structure and parameters of the probability
graph model, and the second step is to apply the probability
graph model online, calculate the online real-time
monitoring data, and input the residual data of the features in the residual nodes, the
direct monitoring data of the features in the data nodes, and the state of the features in the knowledge nodes into the probability graph model to obtain the
posterior probability of each state of the diagnosis layer node, and output the state with the maximum
posterior probability in the diagnosis layer as the fault diagnosis result; the
system includes a memory and a processor, and the processor executes a
computer program to implement the above method. The present invention integrates the advantages of the three types of methods, namely, residual-driven, knowledge-driven, and data-driven, into the same
diagnostic system, realizes the complementary advantages of each other, and obtains better diagnostic performance.