Research on Fault Diagnosis of Nuclear Gate Valve Based on Analysis of Energy Variation Characteristics of Vibration Signal

Nuclear gate valves are the key medium control equipment in nuclear facilities, and its reliable operation is the premise of ensuring the operation of nuclear facilities. In order to effectively diagnose the fault of nuclear gate valve, a fault diagnosis method of nuclear gate valve based on the analysis of energy variation characteristics of vibration signal is proposed. Firstly, the collected vibration signals of valve during normal switching process and the vibration signals of switching process under different failure degrees of valve are decomposed by EEMD(ensemble empirical mode decomposition), and multiple IMF components are obtained. Secondly, the correlation analysis between IMF components and original signal in various states of gate valve is carried out, and the correlation results between the IMF components and original signal are obtained in different states. Then, the energy of target IMF component is calculated, and the fault characteristics of valve under different fault degrees are obtained according to the energy change characteristics of target IMF component. The proposed method is of great significance not only for the health management of gate valves in the nuclear field, but also for the health management of valves in other fields.