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王文彬 《筑路机械与施工机械化》1985,(3)
沥青洒布车是黑色路面筑路工程及养护工程施工过程中必不可少的专用设备。目前,我国黑色路面筑养路工程施工中最普遍使用的是LS—3500型沥青洒布车。该车的关键部件齿轮沥青泵直接影响整车的作业性能,而泵内工作齿轮副的加工质量好否是直接影响沥青泵性能的重要因素,由此可见,这一齿轮副(如图一)则是该沥青洒布车的关键件。 相似文献
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一辆汽车可以分解成若干总成和零部件组成的树形结构,文章讨论了如何应用关系型数据库表达这种层次关系,并根据生产实际对数据记录的编码进行了讨论,最后给出树形结构的展开算法。 相似文献
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The inspection activities are often carried out to detect possible indication of failures in plant systems. This paper considers a single unit system subject to two types of failures, where one failure mode is the traditional 0-1 logic failure and the other failure mode is described by a two-stage failure process. Adjustable inspections are used to detect the defective stage of the latter. We assume that the inspection duration gets shorter and shorter with a constant ratio. At the same time, preventive replacement is used to avoid the possible failure due to the former failure mode. The renewal process of this system is analyzed and the expected long-run cost per unit time (ELRCUT) is derived. The optimal inspection period and the preventive replacement interval to minimize ELRCUT are studied. At last, a numerical example is presented to illustrate the proposed model. 相似文献
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In this paper, we consider the replacement of a single unit with catastrophic failure mode. Besides replaced at a preset time, the unit is also replaced at failure time or if it encounters a production wait and its age has reached a threshold. The joint preventive maintenance interval and threshold optimization problem are formulated with the objective of minimizing the expected cost per unit time in long run. A numerical example is presented to illustrate the applicability of the model. 相似文献
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文章介绍了氢燃料HCCI发动机,氢燃料与HCCI燃烧方式相结合可以有效的降低污染物的排放。文中从氢燃料HCCI发动机的实现方式,氢燃料HCCI燃烧缺陷及处理方法等方面进行了分析。 相似文献