Approximate calculations of age-based random replacement times

Approximate calculations of age-based random replacement times
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基于年龄的随机更换时间的近似计算

DOI:
10.1080/03610926.2019.1710203
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发表时间:
2020-01
期刊:
Communications in Statistics - Theory and Methods
影响因子:
--
通讯作者:
Toshio Nakagawa
Toshio Nakagawa
中科院分区:
其他
文献类型:
--
作者:
Xufeng Zhao;Chen Gao;Cunhua Qian;Toshio Nakagawa

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摘要由于数学的复杂性,替换策略最优解满足的解析公式一直是难以讨论的问题。本文提出了基于年龄的随机替换策略的几种近似计算方法,即单元在时间T、随机时间T和随机时间YN进行替换。利用公式的不等式性质和扩展故障率函数的界,用解析的方法找到了替换次数的近似计算方法。数值算例表明,这些近似计算可以为基于年龄的最佳随机替换时间提供有用的参考。
Abstract It is always difficult to discuss the analytical formulas, in which optimum solutions of replacement policies satisfy, due to the mathematical complexity. This paper proposes several approximate calculations for age-based random replacement policies, such that the unit is replaced at time T, at random time over time T, and at random time YN for We use the inequality properties of the formulas and the bounds of the extended failure rate functions to find the approximate calculations of replacement times in analytical ways. It is shown from numerical examples that these approximate calculations would become useful references for the optimum age-based random replacement times.
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