In this paper, we consider both the mathematical expectation and variance for the time to failure of some systems and design a system with ideal reliability.
本文研究系统寿命的均值和方差，并设计出较为理想的可靠性系统。
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.
对采用继电器控制系统进行控制的某实验室船舶燃油辅助锅炉，采用计数法进行可靠性评估，得出控制电路的平均无故障时间。
This method can be used without assuming that lives of system or component follow time-to-failure distribution, decreasing reliability and variance errors due to incorrect life distribution selection.
该方法不需假设系统或单元产品的寿命服从某一分布，减少了因寿命分布选择不当所造成的可靠性和方差的误差。
This method can be used without assuming that lives of system or component follow time-to-failure distribution, decreasing reliability and variance errors due to incorrect life distribution selection.
该方法不需假设系统或单元产品的寿命服从某一分布，减少了因寿命分布选择不当所造成的可靠性和方差的误差。
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