降额设计是电路可靠性设计中的一种常用方法，通过降额设计可以达到降低器件基本失效率、提高产品使用可靠性的目的。
Through derating design, it can derate the basic failure rate of the components and improve the useing reliability of the product.
从热源、失效率入手，分析了热产生的机理，并提出了电子设备热设计的基本方法。
The article begins from heat source and failure rate, analyzes heat treatment mechanism and discusses heat designing methods of electronic equipments.
现场使用的电机基本运行在偶然失效阶段，因而其失效率近似为一常数。
The motor on the spot is in operation in the random failure period and therefore its failure rate is approximately a constant.
本文讨论了材料退化失效的基本概念，给出了微观结构随机演化的动力学方程，统一导出了失效几率，可靠性、失效几率密度、失效率和平均寿命。
Some key concepts in degradated failure of materials is discussed. The stochastic evolution equation of defect clusters is given and the failure probability reliability and failure rate are derived.
本文讨论了材料退化失效的基本概念，给出了微观结构随机演化的动力学方程，统一导出了失效几率，可靠性、失效几率密度、失效率和平均寿命。
Some key concepts in degradated failure of materials is discussed. The stochastic evolution equation of defect clusters is given and the failure probability reliability and failure rate are derived.
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