Availability-based maintenance optimization under unequal inspection period and imperfect repair

基于可用度的非等检测周期和不完全维修优化（英文）

Taking the multi-component system as research object, a maintenance optimization model based on the unequal inspection period and imperfect repair is established by considering the requirement of expected availability for improving the system＇s availability. An age reduction factor is used to describe the effect of imperfect repair, and the modelling approach for the unequal inspection period is proposed. Unavailable situations are classified into three kinds of independent cases, and the availability is calculated accordingly. Based on the analysis of the relationship between the unavailable cases and the unequal inspection period, an optimization model under imperfect repair is established to optimize the system＇s expected availability. A case study of a wind turbine is provided, and three key components, i.e. gearbox, generator and spindle, are considered. The optimization results of the unequal inspection period model and the equal inspection period model are compared. The results show that the unequal inspection period model based on availability can update the maintenance plan so as to optimize maintenance activities and improve the system＇s availability.

以多部件系统为研究对象,为提高系统可用度,考虑非等周期检测和不完全维修,建立基于可用度的维修优化模型.引入役龄回退因子描述部件不完全维修效果,提出非等检测周期的建模方法.将系统不可用状态划分为3个相互独立的事件,分析和计算每个事件下的系统不可用度.在分析不可用状态与非等检测周期之间关系的基础上,建立不完全维修条件下的维修优化模型,以优化系统的期望可用度.以某风力机的变速箱、发电机和主轴3个核心部件的维修优化为案例,比较非等周期检测维修模型和等周期检测维修模型的优化结果.结果表明,提出的基于可用度的非等检测周期维修模型能够实时更新风力机系统的维修计划,实现维修活动优化。