共查询到20条相似文献,搜索用时 62 毫秒
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论述了可靠性模型在维修决策中的作用。在传统维修模型维修费用的基础上,建立了一般及考虑维修时间的新的最小维修优化模型。该模型是对传统的维修模型的扩充和发展,此法对维修性理论的发展和维修实践活动有一定的参考作用。 相似文献
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随着海军军事任务多样化,执行任务时间长,任务海区远离大陆,可靠、精确的海上维修保障成为了必备的条件。论文从维修保障资源主要包括的保障专业人员、维修设施设和备品备件三个方面建立了需求预测模型,并结合实例说明了模型的使用。 相似文献
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在优化理论的基础上,建立有限资源优化分配的数学模型,给出了相应的解决问题的C++语言函数,并对其进行了简单的评价,最后给出了一个应用的实例. 相似文献
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焊接在现代船舶维修中被广泛应用,焊缝是焊接产生缺陷的主要原因之一,焊缝返修与返修次数成为解决这一问题的关键因素。文章对焊缝缺陷产生原因进行详细分析,对照焊缝产生原因制订返修方案,并在实践中验证其可行性。 相似文献
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海上事故救援是一项涉及面广、专业性强、需要依靠各相关部门通力合作、联合作战的系统工程。如果救援工作处理不当,将直接导致人命和财产的巨大损失,后果严重。因此,研究此预案的目的是在预案的框架内,在第一时间内及时将各相关方的救援力量有效地组织、协调起来,协同作战,迅速、有效地实施救援工作,将海上人命和财产损失降至最低。 相似文献
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文章结合制订某型主动力装置预防性维修大纲的体会,就制订船舶设备的预防性维修大纲的技术路线、应该注意的问题进行了探讨,并提出了加快大纲制订进度的建议. 相似文献
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超大型船舶的发展日趋迅猛,这对航海者来说不仅要求更高,操船技术难度也更大,我们有必要不断总结经验,掌握客观规律,提高操作技能,从而更好更安全地驾驶超大型船舶。 相似文献
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Choosing between the competing approaches to providing enhanced bus services requires the ability to predict the effects on patronage and overall benefits to society in terms of Value of Resources Consumed (VRC) of any proposed change. One common approach uses the Mohring model of 1972 and its successors to optimise one or more aspects of the supply of transit services given various level of demand. This paper simulates the operation of a simple circular bus route using the equations of a basic Mohring type model and a Decision Support System (DSS) to endogenise demand under the assumption that there is a fixed demand for travel but commuters can choose between the bus and private vehicle. The selected approach recognises that demand for a particular mode of travel is predicated on the speed of the vehicle in service which is itself determined by the demand for that vehicle (in this model or boarding and alighting time) rather than being determined exogenously. This creates an iterative feedback mechanism whereby changes to the attributes of the bus and car alter mode choice and the speed in service of the bus which, in turn, alters mode choice. The simulation is used to predict changes to patronage and VRC under scenarios regarding changes to the transport network (in terms of fares and running costs, frequency and spacing of bus stops) using parameters from both a Multinomial Logit (MNL) and a Mixed Multinomial Logit (MMNL). The results demonstrate that there are large differences in the size and, in some cases, direction of predicted changes to patronage, VRC and revenue, depending on whether the parameters of the MNL or MMNL model are used. 相似文献