According to the failure characteristics of aircraft structure, a delay-time model is an effective method to optimize maintenance for aircraft structure. To imitate the practical situation as much as possible, imperfe...According to the failure characteristics of aircraft structure, a delay-time model is an effective method to optimize maintenance for aircraft structure. To imitate the practical situation as much as possible, imperfect inspections, thresholds and repeated intervals are concerned in delay-time models. Since the suggestion by the existing delay-time models that the inspections are implemented in an infinite time span lacks practical value, a de- lay-time model with imperfect inspection within a finite time span is proposed. In the model, the nonhomogenous Poisson process is adopted to obtain the renewal probabilities between two different successive inspections on de- fects or failures. An algorithm is applied based on the Nelder-Mead downhill simplex method to solve the model. Finally, a numerical example proves the validity and effectiveness of the model.展开更多
依据部件单位工作时间费用(cost per operating unit of time,CPUT)随部件连续无维修工作时间的变化规律,可以确定部件最优定时维修间隔期。由多部件构成的复杂产品,需要对其各部件最优定时维修间隔期进行整合。根据产品各构成部件的可...依据部件单位工作时间费用(cost per operating unit of time,CPUT)随部件连续无维修工作时间的变化规律,可以确定部件最优定时维修间隔期。由多部件构成的复杂产品,需要对其各部件最优定时维修间隔期进行整合。根据产品各构成部件的可靠性重要度(reliability importance,RI),建立了复杂产品单位工作时间费用随产品连续无维修工作时间变化关系,获得了复杂产品最优定时维修间隔期。展开更多
It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendation...It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendations given in the engine maintenance management manual, and taking the repair levels adopted in the previous shop visits into account, a series of module repair level optimization rules were set up, and a shop visit cost optimization model was also created for engine service life cycle. The particle swarm method was used to optimize the engine workscope and overhaul cost. The method proposed in this paper will be a reference for airlines to make engine workscope and to do engine maintenance management.展开更多
基金Supported by the National Natural Science Foundation of China(61079013)the Natural Science Fund Project in Jiangsu Province(BK2011737)~~
文摘According to the failure characteristics of aircraft structure, a delay-time model is an effective method to optimize maintenance for aircraft structure. To imitate the practical situation as much as possible, imperfect inspections, thresholds and repeated intervals are concerned in delay-time models. Since the suggestion by the existing delay-time models that the inspections are implemented in an infinite time span lacks practical value, a de- lay-time model with imperfect inspection within a finite time span is proposed. In the model, the nonhomogenous Poisson process is adopted to obtain the renewal probabilities between two different successive inspections on de- fects or failures. An algorithm is applied based on the Nelder-Mead downhill simplex method to solve the model. Finally, a numerical example proves the validity and effectiveness of the model.
文摘依据部件单位工作时间费用(cost per operating unit of time,CPUT)随部件连续无维修工作时间的变化规律,可以确定部件最优定时维修间隔期。由多部件构成的复杂产品,需要对其各部件最优定时维修间隔期进行整合。根据产品各构成部件的可靠性重要度(reliability importance,RI),建立了复杂产品单位工作时间费用随产品连续无维修工作时间变化关系,获得了复杂产品最优定时维修间隔期。
文摘It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendations given in the engine maintenance management manual, and taking the repair levels adopted in the previous shop visits into account, a series of module repair level optimization rules were set up, and a shop visit cost optimization model was also created for engine service life cycle. The particle swarm method was used to optimize the engine workscope and overhaul cost. The method proposed in this paper will be a reference for airlines to make engine workscope and to do engine maintenance management.
