国外高档龙门式加工中心的可靠性综合评价（英文）

Comprehensive reliability evaluation of foreign high-end gantry machining Center

采用定时截尾试验法收集了2组国外高档龙门式加工中心的故障数据。通过传统的可靠性分析方法分别计算了不同截尾次数下的MTBF和MTTFF,然后通过动态加权法确定了不同样本下的MTTFF与MTBF的权重,最后通过波达计数函数对这两组机床进行了排序。结果表明:A2组明显好于A1组,同时也表明多次截尾实验下的动态加权法充分体现了评价对象的"质差"和"量差",是一种切实可行的数控机床可靠性评价方法。

The time between failures,two groups of failure data of foreign high-end gantry machining center,were collected by failure truncated testing. MTTFF and MTBF in different truncated number were calculated by the traditional method of reliability analysis. Then,the weights of MTTFF and MTBF of different samples were determined by dynamic weighting method. Eventually,the evaluated systems were sorted by Borda count function. The results show that A2 group is significantly better than A1 group. And the dynamic weighting method in multiple failure truncated testing could fully reflect the difference of the evaluated object both in the quality and quantity,which is a feasible method for reliability evaluation of gantry machining center.