Fault Tree Analysis of Feeding Control System for Computer Numerical Control Heavy-Duty Horizontal Lathes with Multiple Common Cause Failure Groups

The lathes are basic machine tools for manufacturing cylindrical parts. In recent years, the DLseries computer numerical control(CNC) heavy-duty horizontal lathes(HDHLs) have been widely used in the transportation, energy and aviation industries. High availability of the CNC heavy-duty lathes is demanded to guarantee the efficiency and benefit of these manufacturing industries. As one of the key subsystems of the HDHLs, the feeding control system is studied in this paper on reliability modeling and reliability analysis. The fault tree analysis(FTA) method is used for reliability modelling of the feeding control system. Considering the multiple common cause failure groups(CCFGs) existing in the system, a modified beta factor parametric model is introduced to model the common cause failure(CCF) in system. The reliability of feeding control system is then obtained and the effect of CCF on the reliability of the whole system is studied as well.

基于成功流法的共因失效可靠性仿真

针对共因失效使系统可靠性分析复杂化的问题,提出基于成功流(GO)法的共因失效可靠性Simulink仿真方法。在构建共因集GO模型时,考虑共因失效的影响。运用累积概率法进行定量计算,并构建共因集Simulink模型,利用仿真工具降低建模、计算的难度。经算例验证,改进仿真方法较传统计算方法更为简单,Simulink在共因失效可靠性GO法分析中具有可行性与有效性。