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
我的 QQ311从买来到现在已经3个月了,行驶了1000公里。除了在验车时发现后座的安全带的插扣有问题进行更换外,到目前没有出现其他严重的问题。小的问题有:1.油耗高,到目前每次加油100L,平均油耗9L/100km;2.一挡在行驶中不好挂;3.倒挡不...我的 QQ311从买来到现在已经3个月了,行驶了1000公里。除了在验车时发现后座的安全带的插扣有问题进行更换外,到目前没有出现其他严重的问题。小的问题有:1.油耗高,到目前每次加油100L,平均油耗9L/100km;2.一挡在行驶中不好挂;3.倒挡不容易挂回空挡。QQ 易损件的保修期是3个月,打算在保修期到前去给车检查下,特别是油耗的问题,如果需要换零件的话还可以索赔。星期四打了一个电话给西物的客服,简述了以上问题,然后预约了检查的时间。进了4S 店,向客服 MM 说是预约的,然后报了车牌号。客服 MM 在打印出一张检修任务单后,告诉我油耗的问题不好解决,然后请我把车开到接车区去铺地垫和座套纸。在维修间里向师傅重复说明了发现的问题。师傅先试了一下挡位,然后开车和我一起在车间里转了一圈。师傅告诉我说一挡是启动挡,车在行驶时会由于齿轮不同步而产生卡位的情况,磨合以后会好一些。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.
文摘我的 QQ311从买来到现在已经3个月了,行驶了1000公里。除了在验车时发现后座的安全带的插扣有问题进行更换外,到目前没有出现其他严重的问题。小的问题有:1.油耗高,到目前每次加油100L,平均油耗9L/100km;2.一挡在行驶中不好挂;3.倒挡不容易挂回空挡。QQ 易损件的保修期是3个月,打算在保修期到前去给车检查下,特别是油耗的问题,如果需要换零件的话还可以索赔。星期四打了一个电话给西物的客服,简述了以上问题,然后预约了检查的时间。进了4S 店,向客服 MM 说是预约的,然后报了车牌号。客服 MM 在打印出一张检修任务单后,告诉我油耗的问题不好解决,然后请我把车开到接车区去铺地垫和座套纸。在维修间里向师傅重复说明了发现的问题。师傅先试了一下挡位,然后开车和我一起在车间里转了一圈。师傅告诉我说一挡是启动挡,车在行驶时会由于齿轮不同步而产生卡位的情况,磨合以后会好一些。
