Comparison of Three Cumulative Damage Models
Comparison of Three Cumulative Damage Models
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DOI：
10.1080/16843703.2011.11673246
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发表时间：
2011-01
影响因子：
2.8
通讯作者：
Ito Kodo;Nakagawa Toshio
中科院分区：
文献类型：
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作者：
Ito Kodo;Nakagawa Toshio
摘要日本老化的火电厂数量急剧增加，为保证其稳定运行，需要对其进行适当的维护。为避免出现紧急断电等严重故障，对此类系统进行预防性维护是必不可少的。为了预测系统的寿命并设计合适的维修方案，累积损伤模型是可行的。本文考虑了三种累积损伤模型：(1)单元受到冲击，并受到一定的冲击损伤。(2)由于冲击造成的损坏量仅在周期性时间内测量。(3)伤害量随时间线性增加。对于三种型号，总损伤是相加的，当总损伤超过失效水平时机组失效。模型2和模型3实际上分别作为模型1和模型1和模型2的近似模型。预防性更换策略是在设备出现故障前按照计划的时间对设备进行更换。得到了各模型的期望成本率，并推导出使其最小化的最优策略。进一步，对任意周期内各模型的平均损伤量相同时，各模型的最优策略进行了数值比较。
Abstract Aged fossil-fired power plants are increasing greatly in Japan and they need the appropriate maintenance for their steady operations. The preventive maintenance (PM) of such systems is indispensable to avoid the serious trouble such as the emergency stop of power supply. To predict the lifetime of system and design a suitable maintenance, the cumulative damage models are applicable. This paper considers three cumulative damage models: (1) A unit is subjected to shocks and suffers some damage due to shocks. (2) The amount of damage due to shocks is measured only at periodic times. (3) The amount of damage increases linearly with time. The total damage is additive and the unit fails when the total damage has exceeded a failure level for three models. Models 2 and 3 would be actually used as the approximated ones of Model 1 and Models 1 and 2, respectively. As the preventive replacement policy, the unit is replaced before failure at a planned time. The expected cost rates of each model are obtained, and optimal policies that minimize them are derived. Further, optimal policies of each model are compared numerically when each model has the same mean amount of damage at any periodic times.