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影响寿命周期费用的因素很多,前几讲主要讨论了设备技术性能对费用的影响及其估算问题,这一讲将进一步探讨设备可靠性、维修性、可用性等对费用的影响,进一步研究与寿命周期费用相关的设备论证、设计选型问题.一、设备的可靠性、维修性、可用度与费用的关系1.可靠性对费用的影响设备的可靠性是指在规定条件下和规定时间内,完成规定功能的能力.常用可靠度R(t)、失效率λ(t)或平均故障间隔时间MTBF来度量.设备的故障一般服从指数分布,故障率λ为常数,三者有以下关系R(t)=e~(-λt)采用更可靠的元器件、模块结构、标准化零件以提
There are many factors that affect the life cycle cost. The first few lectures mainly discussed the impact of equipment technical performance on the cost and its estimation. This lecture will further explore the impact of equipment reliability, maintainability, and availability on the cost, and further study and life Cycle cost related equipment demonstration, design and selection issues. I. Reliability, maintainability, availability and cost of equipment 1. Impact of reliability on costs The reliability of equipment refers to the specified conditions and the specified time The ability to perform the specified functions. Common reliability R(t), failure rate λ(t), or mean-time-between-failure-time MTBF. Device failure generally follows exponential distribution, and failure rate λ is constant. The three have the following relationship R (t)=e~(-λt) using more reliable components, module structures, and standardized parts