The common reliability targets are reliability probability and m 'ttf (MeanTimeToFailures). MTTF features directly and distinctly, so it is more convenient.
工程中常用的可靠性指标有可靠度和平均寿命，平均寿命指标直观、物理概念清晰，使用更加方便。
2
If you know the meantime between failures and the meantimeto recovery, e.g. for the hardware, use the calculations in this section.
如果知道失效之间的平均时间和平均恢复时间(例如对于硬件)，则使用这一部分中的计算方法。
3
The paper introduces a practical method to calculate the meantime between failures (MTBF) of ac servo controllers, using the components counting prediction method.