Failure Correlation Analysis for A Heavy-Duty CNC Machine Tool
Due to the complex structure of the heavy-duty CNC machine tools,there is a close interaction relationship between the various subsystems,a single subsystem failure may lead to a chain reaction,affecting the performance of the entire machine tool or even cause system-level failures.In view of this,according to the explanatory structural model obtained by the DEMATEL/ISM method,the failure data of subsystems at each level were modeled using the two-parameter Weibull distribution,and the model was subjected to pa-rameter estimation and goodness-of-fit test,and the parameter corrections were carried out for the levels with less data;the correlation and transmissibility between levels were analyzed by applying the Copula function and the correlation coefficients were calculated to ob-tain the reliability function by considering the failure correlation,and the reliability function was compared with that without considering the failure correlation.The results show that the reliability curve of the heavy-duty CNC machine tool is more complicated due to the in-teraction and dependence between different subsystems,which confirms that the modeling of considering the correlation is more in line with the reality.
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