关键词: 经济优化模型, 不完全预防性维修策略, 可靠度约束, 混合故障率

Abstract: To solve the problems of frequent fault and heavy wasting resources due to unreasonable device maintenance schedule of repairable system,based on describing repaired device degradation course with hybrid hazard rate function which including age reduction factor and incremental hazard rate factor,a single-device dynamic imperfect Preventive Maintenance (PM) model with reliability constraints in finite time was built.The certain railway track circuit device was introduced as a simulation example,the best PM times and the flexible cycles were determined to minimize the total repair cost ratio under the lowest working reliability threshold,and the model was compared with equal cycle PM model without reliability constraints.The contrastive optimization results showed that the model could effectively guarantee the device highly reliable operation,lower hazard rate better and more economically,which provided a significant reference for formulating the optimum repair policy.

Key words: economic optimization model, imperfect preventive maintenance policy, reliability constraint, hybrid hazard rate