Optimal condition-based maintenance strategy under periodic inspections for traction motor insulations
Optimal condition-based maintenance strategy under periodic inspections for traction motor insulations
复制标题
牵引电机绝缘定期检查下的最佳状态维护策略
DOI：
10.1631/jzus.a1400311
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
He Zhang
中科院分区：
文献类型：
--
作者：
Jian Zhang;Ji-en Ma;Xiaoyan Huang;Youtong Fang;He Zhang
Insulation failure is a crucial failure mode of traction motors. Insulation deteriorates under both fatigue load and shock. This paper focuses on proposing an optimal insulation condition-based maintenance strategy. By combining the information obtained from periodic inspections with historic life information, an integrated model of time-based maintenance and condition-based model is proposed, in which random shocks following Poisson process are also taken into account. In this model we define that insulation has three states: normal state, latent failure state, and functional failure state. Normal state and latent failure state differ in their operating cost, proneness to functional failure, and survival probability under extreme shocks. Preventive maintenance (PM) will be launched if an inspection result exceeds the threshold or if the operating time reaches the critical age. One operating cycle ends as soon as a preventive maintenance or a corrective maintenance is completed. Moreover, an optimization model is established, which takes minimal cost per unit time as the objective, and inspection interval and critical age as the optimization variables. Finally, a numerical example illustrates the analytic results.摘要目的充分利用寿命信息, 并考虑冲击效应对维修策略的影响, 提出符合牵引电机绝缘运行特征的最优视情维修策略。方法1. 采用正常状态、潜在故障状态与功能故障状态描述牵引电机绝缘运行状况; 2. 应用泊松过程描述随机高电压冲击; 3. 以单位时间的运行成本为目标函数, 以监测间隔和预防性维修寿命阈值为优化变量, 建立最优视情维修决策模型。结论该模型能显著降低牵引电机绝缘功能故障的风险, 同时降低单位时间运行成本。