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In order to analyze the failure data from repairable systems, the homogeneous Poisson process(HPP) is usually used. In general, HPP cannot be applied to analyze the entire life cycle of a complex, re-pairable system because the rate of occurrence of failures (ROCOF) of the system changes over time rather thanremains stable. However, from a practical point of view, it is always preferred to apply the simplest methodto address problems and to obtain useful practical results. Therefore, we attempted to use the HPP model toanalyze the failure data from real repairable systems. A graphic method and the Laplace test were also usedin the analysis. Results of numerical applications show that the HPP model may be a useful tool for the entirelife cycle of repairable systems. 相似文献
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虚拟流水线生产系统及Petri网建模技术研究 总被引:2,自引:0,他引:2
根据船舶生产模式和特点,提出了船舶产品中曲面分段加工的虚拟流水线作业模式。研究了虚拟流水线生产系统的原理和特点,并对虚拟流水线生产关键技术中的作业负荷均衡技术和准时化生产控制技术进行研究。利用面向对象Petri网技术建立虚拟流水线生产系统模型,并将系统决策规则融于模型中,为系统仿真和调度研究创造了条件。 相似文献
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虚拟流水线生产系统及Petri网建模技术研究 总被引:2,自引:0,他引:2
根据船舶生产模式和特点,提出了船舶产品中曲面分段加工的虚拟流水线作业模式.研究了虚拟流水线生产系统的原理和特点,并对虚拟流水线生产关键技术中的作业负荷均衡技术和准时化生产控制技术进行研究.利用面向对象Petri网技术建立虚拟流水线生产系统模型,并将系统决策规则融于模型中,为系统仿真和调度研究创造了条件. 相似文献
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基于FEA和ANN的水火弯板表面变形预测方法 总被引:3,自引:0,他引:3
水火弯板是船体曲面的主要加工方法.目前,水火弯板的表面变形质量主要由加工技师的技术和经验决定.为了科学合理地预测其表面变形量,确定水火弯板的加工参数,提高产品的质量和生产效率,本文提出了一种高效、准确的水火弯板表面变形预测方法.首先应用有限元分析法(FEA)对水火弯板的成型过程进行模拟仿真;然后建立水火弯板加工参数与板件表面变形之间的神经网(ANN)模型,并依据FEA的分析结果对网络进行训练;最后应用该网络对钢板的表面变形量进行预测. 相似文献
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阐述了钢材利用率和钢材规格对于船厂效益的影响,以及相互之间的关系。另外,还从加强过程控制出发,对典型结构进行分析,提出提高钢材利用率的具有可行性的系列技术方法,以及余料管理的原则和方法。 相似文献
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Mixed-effects models,also called random-effects models,are a regression type of analysis which enables the analyst to not only describe the trend over time within each subject,but also to describe the variation among different subjects.Nonlinear mixed-effects models provide a powerful and flexible tool for handling the unbalanced count data.In this paper,nonlinear mixed-effects models are used to analyze the failure data from a repairable system with multiple copies.By using this type of models,statistical inferences about the population and all copies can be made when accounting for copy-to-copy variance.Results of fitting nonlinear mixed-effects models to nine failure-data sets show that the nonlinear mixed-effects models provide a useful tool for analyzing the failure data from multi-copy repairable systems. 相似文献
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