共查询到18条相似文献,搜索用时 78 毫秒
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贺慧琳 《计算机工程与科学》2015,37(8):1525-1532
GO法是一种系统可靠性分析方法,可将GO法应用到软件体系结构的可靠性分析中。根据软件体系结构自身的特点及构件之间的关系,分别建立了软件体系结构六种基本结构的GO模型,并进行了定量GO运算。通过一个实例,说明了应用GO法对软件体系结构的可靠性进行分析的全过程。实践表明:运用定量GO运算能够方便地计算出整个软件体系结构的可靠度,通过定性GO分析还可评估各构件及连接件的重要性,对后期系统的设计与开发具有一定的指导意义。 相似文献
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轨道交通信号产品作为保障列车行车安全的实时控制系统,必须具有高可靠性和高安全性.为了能够提前发现轨道交通信号产品设计中的薄弱环节,给产品设计方案的选择和优化提供数据支撑,文章以轨道交通信号系统安全计算机平台中的倒机单元产品为例,提出一种可靠性预防方法.其首先建立可靠性框图和模型,然后利用元器件应力法对其进行可靠性预计,... 相似文献
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针对机械产品装配过程质量缺陷源对质量的影响度难以量化的问题,借鉴熵值理论,提出了面向机械产品装配过程的装配质量缺陷源熵概念,并进行缺陷源熵的计算,从而达到量化缺陷源对质量影响度的目的。该方法以产品装配过程质量的影响因素为研究对象,在分析影响质量的因素和确定相应状态判定标准和方法的基础上,给出了装配质量缺陷源熵的算法并进行了仿真求解,从而得到各缺陷源的权重,分析仿真图形对缺陷源重要度进行排序。最后通过算例分析表明该算法在度量装配质量缺陷源的缺陷度应用中是可行的、有效的。 相似文献
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装配系统是生产系统的基本结构之一, 广泛应用于汽车、电器、电子产品等实际生产环境中.与传统的串行生产线取得的研究成果相比, 装配系统的研究, 特别是对系统暂态过程的实时性能分析的研究仍然未得到深入探讨.本文针对具有三台几何可靠性机器模型和有限缓冲区容量框架下的装配系统, 首先建立了用于此类系统暂态性能分析的数学模型, 通过马尔科夫方法导出了系统性能分析的解析公式.然后, 提出了一种基于分解的性能评估算法来近似系统的实时性能.具体来说, 本文推导出了用于计算具有三台几何可靠性机器模型的装配系统的实时生产率、消耗率、在制品数量, 以及完成一个生产批次所需时间的解析表达式.最后, 通过数值实验对所提出算法的准确性进行验证. 相似文献
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针对复杂车身连接关系和多装配顺序,改进后的装配模型不仅描述了零件间的装配优先关系,而且还包含了可以用于公差分析的装配连接特征信息.在此基础上,根据迂回遗传算法对零件间的装配操作进行优化,以提高优化效率及求解范围.最后,通过某车身侧围装配案例说明了该算法的有效性. 相似文献
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针对日益增长的海量制造和装配数据,提出了一种基于ISA95对象模型的数据仓库分析方法.总结了装配过程数据的特点,提出基于ISA95对象模型的装配数据分类方法.将装配数据分成4种主要类型,分析了各类数据之间的潜在关系,建立质量主题和计划主题的数据仓库模型,应用该方法实现了航空发动机装配过程质量数据的分析. 相似文献
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Most private and public organizations have recently turned their attention to the process by which they operate, to improve service and product quality and customer satisfaction. To support business process reengineering, methods and tools for process modeling and analysis are required. The paper presents the ARTEMIS methodology and associated tool environment for business process analysis for reengineering. In the ARTEMIS methodological framework, business processes are modeled as workflows and are analyzed according to an organizational structure perspective and an operational structure perspective. With these two perspectives, the analyst can plan reengineering interventions based on the degree of autonomy/dependency of organization units in terms of coupling, and the inter-process semantic correspondences, in terms of data and operation similarity, respectively. The ARTEMIS methodology and associated tool environment have been conceived and applied in the framework of the PROGRESS research project. In the paper, we report on a reengineering case study of this project involving the Italian Ministry of Justice. 相似文献
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流程导向的新产品开发领域本体构建方法研究 总被引:1,自引:0,他引:1
分析了新产品开发领域的特点,基于对现有本体构建方法的分析和改进,结合基于本体的知识检索,提出了流程导向的新产品开发领域本体构建方法。该过程分为原型展示、本体详细构建、本体进化三个阶段。重点对该方法的过程进行了详细阐述。最后,对流程导向的新产品开发本体构建方法进行了评述。 相似文献
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The goal of this study is to present an efficient strategy for reliability analysis of multidisciplinary analysis systems. Existing methods have performed the reliability analysis using nonlinear optimization techniques. This is mainly due to the fact that they directly apply multidisciplinary design optimization (MDO) frameworks to the reliability analysis formulation. Accordingly, the reliability analysis and the multidisciplinary analysis (MDA) are tightly coupled in a single optimizer, which hampers the use of recursive and function-approximation-based reliability analysis methods such as the first-order reliability method (FORM). In order to implement an efficient reliability analysis method for multidisciplinary analysis systems, we propose a new strategy named sequential approach to reliability analysis for multidisciplinary analysis systems (SARAM). In this approach, the reliability analysis and MDA are decomposed and arranged in a sequential manner, making a recursive loop. The key features are as follows. First, by the nature of the recursive loop, it can utilize the efficient advanced first-order reliability method (AFORM). It is known that AFORM converges fast in many cases and requires only the value and the gradient of the limit-state function. Second, the decomposed architecture makes it possible to execute concurrent subsystem analyses for both the reliability analysis and MDA. The concurrent subsystem analyses are conducted by using the global sensitivity equation (GSE). The efficiency of the SARAM method was verified using two illustrative examples taken from the literatures. Compared with existing methods, it showed the least number of subsystem analyses over the other methods while maintaining accuracy. 相似文献
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Investigations have shown that human error (HE) is the most common cause of accidents involving lifting operations. So it is essential to conduct human reliability analysis (HRA) in lifting operations. The estimation of human error probabilities (HEPs) is a key to HRA. In this paper, five useful performance shaping factors (PSFs) of lifting operations were introduced and an approach to combine Bayesian methodology and the success likelihood index method (SLIM) was applied to determine the HEPs of various lifting operation errors. A numerical example was used to illustrate the application of the proposed methodology.Relevance to industryReliability analysis of crane lifting operation has traditionally been difficult without considering human error. The present study suggests that managers could use the Bayesian-SLIM methodology to conduct human reliability analysis and minimize human error in crane lifting operation. 相似文献
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装车站运输作业的时间可靠性程度直接关系到货达时间可靠性。在"实货"运输的背景下,对装车站运输作业的时间可靠性的研究至关重要。详细分析了装车站运输作业具体过程,建立了装车站的运输作业仿真系统,提出了装车站运输作业时间可靠度的计算方法与模型,界定了其影响因素。最后,基于以上研究成果,给出提高时间可靠性的几点建议。 相似文献