In order to solve the complex problem of reliability analysis of CNC machine tool system, this paper combines the failure mode influence and hazard analysis method with the dynamic Bayesian network to establish a reliability analysis model. Firstly, the failure causes, failure modes and main fault parts of CNC machine tools were analyzed, and the risk assessment of the failure causes was carried out in combination with expert opinions. Then, based on the failure mode table and fault data of the CNC machine tool, the structure and parameters of the dynamic Bayesian network reliability model were constructed. The state change of the system, the importance of the faulty parts, the importance of the subsystem and the state changes of each component are analyzed by the model, and the results of the model analysis are compared with the traditional Monte Carlo method.
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