关键词: 加工中心, 经验建模, 时间动态可靠性, 相关性分析

Abstract: As the assumption of the machining center can be repaired to new may be biased in real case, a new reliability modelling technique is proposed based on the empirical modelling method. The reliability models of machining center are estabilshed on the fault time firstly, which could describe the reliability level at a given time with no time series changes in the test period, and overcome the weakness of the reliability models built on the fault time interval can only give the reliability which changes as the time from one fault to the next fault. Then, in order to describe the distributions of various sequence fault time, modelling method based on every sequence fault time is present, and the correlation of the fault time is analyzed. Combined the models of fault time and the every sequence fault time, the reliability status can be obtained. Finally, a case example of 18 machining centers is given, the models of fault time and the every sequence fault time are built. It shows that the correlation relationship is obvious.

Key words: Correlation analysis, Empirical modelling, Machining center, Time dynamic reliability