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一、系统可靠性概念和可靠性指标1.可靠性可靠性是产品质量的指标,其定义为:产品在规定的条件下和规定的时间内,完成规定功能的能力.其中规定条件是指产品工作时所处的环境条件、维护条件、使用条件等,规定时间是指考察产品是否正常工作的起止时间,规定功能则是指产品应当实现的功能.必须注意:上述三个规定的条件不同,则可靠性也不同.例如,同一个产品在试验室内工作与在恶劣的现场条件下工作可靠性不同,在同样条件下工作一年与工作数年可靠性也不同.2.可靠度可靠度是直接从可靠性演化而来的定量指标,在国家标准中对可靠度的定义是:产品在规定的条件下和规定的时间内完成规定功能的概率.
First, the concept of system reliability and reliability index 1. Reliability Reliability is the product quality indicators, which is defined as: the product under the specified conditions and within the prescribed time, the ability to complete the specified functions. The provisions of the conditions refers to the product The working hours when the environmental conditions, maintenance conditions, conditions of use, the provisions of the time refers to the inspection of the normal starting and ending time of the product, the provisions of the function refers to the product should achieve the function.We must note that: the three conditions are different, The reliability is different.For example, the same product working in the laboratory and working in harsh field conditions of different reliability, work in the same conditions for a year and years of reliability is also different .2 Reliability reliability is Directly from the reliability of quantitative indicators of evolution, in the national standard definition of reliability is: the product under specified conditions and the required time to complete the specified function of the probability.