Reliability Analysis of Hydraulic Drive System of Tunnel Erecting Machine Based on DFTA-BN
Tunnel erecting machine is a specialized equipment for the lifting and pavement of prefabricated comprehensive tunnel sections.To ensure the safe and efficient operation of the hydraulic drive system,a reliability analysis method based on dynamic fault tree analysis and Bayesian network(DFTA-BN)was studied.According to the working principle and hydraulic system of tunnel erec-ting machine,the T-S dynamic fault tree model was constructed and mapped into a BN directed acyclic graph.Bidirectional inference of hydraulic drive system was performed by using DFTA-BN,and key causal chains of system fault were obtained by posterior probability inference of GeNIe,then the importance and sensitivity of the system were analyzed and the effectiveness of the model was verified.The results show that the probability of hydraulic drive system fault during the initial time period of overall task is high.There are eight key causal chains,and system risk factors include hydraulic oil fault,cylinder seal damage,uneven load of hydraulic cylinders,poor guide rail lubrication and hydraulic valve group fault;motor,hydraulic pump,guide rail and overflow valve are the weak points of the system.
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