The presented method can be easily used in engineering for MTTF evaluation of large complex system, where limited testing data of unit life time is required.
The common reliability targets are reliability probability and m 'ttf (Mean Time To Failures). 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。
3
The reliability lab ship fuel oil donkey boiler controlled by relay control system is evaluated using counting method, and mean time to failure (MTTF) of the control circuit is educed.