共查询到18条相似文献,搜索用时 93 毫秒
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QFD中质量特性实现水平的多目标协同确定方法 总被引:1,自引:0,他引:1
为了高效、灵活地处理质量功能展开中各阶段的各种不精确信息及多目标优化问题,将每个质量功能展开开发人员所提供的信息作为多属性证据推理的证据源,并将相关的推理算法拓展到群体证据源的合成中,获得一致性决策结果.建立了以客户满意度最大化、质量特性实现成本和质量特性实现难度最小化的多约束多日标优化模型,进而通过改进的非支配排序遗传算法获得质量特性实现水平Pareto的解集,并利用模糊优选法确定最佳解.以大型深冷式空气分离设备的研发为例,对所提方法进行了验证与说明. 相似文献
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基于QFD与TRIZ技术工具的产品概念设计方法 总被引:11,自引:0,他引:11
为消除产品概念设计过程中可能产生的二层问题的负面影响,提出了一种基于质量功能配置与创造性解决问题理论的三种技术工具综合的产品概念设计方法。该方法通过质量功能配置的质量屋分析确定需要改善的零部件;在对零部件进行负相关分析的基础上,应用创造性解决问题理论技术工具提出解决一对质量特性负相关的方案;然后通过多次循环的质量功能配置分析与创造性解决问题理论技术工具应用,预测可能产生的二层问题并降低其负面影响,进而形成有效的产品概念设计方案。通过在某全自动洗衣机研发过程中的实际应用,验证了该方法的有效性和实用性。 相似文献
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针对新产品因故障概率数据掌握不充分使其故障诊断较为困难的问题,提出了一种基于加权D—S证据理论多源信息融合的故障诊断方法。该方法采用D-S证据融合,解决了缺乏故障概率分布模型或准确数学分析无效的问题,引入加权Ds证据理论融合方法进行故障诊断,用历史故障估计的正确率作为确定信息源当前检测估计值的置信程度调整,实现了故障诊断的历史数据对当前诊断结果的修正。对新型船舶气象仪故障诊断结果表明,该方法在故障概率和故障经验知识掌握不充分时,实现故障诊断是非常有效的。 相似文献
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基于QFD的质量屋技术在冰箱设计中的应用 总被引:2,自引:0,他引:2
质量功能配置(QFD)利用质量屋将顾客需求转变成产品设计及制造需求.着重阐述了质量屋的生成过程,并以某企业所生产冰箱的客户需求为例,建立了评价模型,并在质量屋中构造相关要素矩阵以定量地确定用户需求,最后对质量屋可能存在的问题进行了分析. 相似文献
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多源不确定性下基于证据理论的可靠性分析方法 总被引:1,自引:0,他引:1
针对同时存在随机、模糊和区间三种输入变量时的可靠性分析问题,提出了一种基于证据理论的统一可靠性分析方法。利用信息熵转化法,将模糊变量的隶属度函数转化为等效随机变量的概率密度函数;基于随机变量的区间化方法,将每个变量离散成有限个小区间,根据变量的概率密度函数求解各小区间的基本概率分配;利用证据理论进行可靠性分析,最终获得可靠度R的置信度Bel(R)和似真度Pl(R)。通过两个工程算例证明了该方法的可行性和有效性。 相似文献
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Lian-Yin Zhai Li-Pheng Khoo Zhao-Wei Zhong 《The International Journal of Advanced Manufacturing Technology》2008,37(5-6):613-624
Quality function deployment (QFD) provides a systematic methodology to assist companies in developing quality products that
are able to satisfy customer needs. The house of quality (HOQ), as the first phase of QFD, plays the most important role in
product development. Frequently, fuzzy numbers are used to quantify the vagueness of linguistic terms so as to facilitate
subjective assessments in the HOQ. However, the issue concerning how to determine the boundary intervals of fuzzy numbers
remains unresolved. This work proposes a novel approach based on rough set theory, and introduces two concepts called rough
number and rough boundary interval to address this issue. A comparative case study presented in this work shows that the proposed
approach has significant advantages compared to the prevailing fuzzy number based method in processing subjective linguistic
assessments in QFD. 相似文献
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基于随机集理论的并发故障诊断信息融合方法 总被引:7,自引:0,他引:7
为了诊断并发故障,提出一种基于随机集理论的信息融合方法.首先构造包含并发故障的论域,并在此论域的超幂集上定义扩展型随机集.基于该随机集和广义集值映射给出证据组合规则的随机集模型,用其构造可以同时适用于单发和并发故障诊断的新型组合规则.此外,根据传感器提供的故障信息构造故障样板模式与待检模式的模糊隶属度函数,利用模糊集的随机集表示以及随机集似然测度,获得两种模式匹配的程度作为待融合的诊断证据.最后通过在电机柔性转子平台上的试验,证明了所提方法可有效地减少单一传感器信息诊断的不确定性,显著提高转子系统故障诊断的精度. 相似文献
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针对液压驱动火箭炮随动系统故障类型的多样性以及故障信息不确定性等问题,提出了证据理论与神经网络综合集成的故障诊断方法。为克服单一神经网络自身的缺点,在普通节点处建立2个改进神经网络模型来简化网络结构,分别以铁谱数据和压力、流量、温度特征参数作为输入向量进行初始故障诊断,并将诊断结果作为证据理论的基本概率分配,从而实现了赋值的客观化。然后,利用 D-S 证据理论对2个改进神经网络的初始诊断结果进行融合。实验结果表明:该方法避免了神经网络识别时的误诊,提高了液压驱动的火箭炮随动系统故障诊断的准确性。 相似文献
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Rui Sun Hong-Zhong Huang Qiang Miao 《Journal of Mechanical Science and Technology》2008,22(12):2417-2425
Conventional D-S evidence theory has an unavoidable disadvantage in that it will give counter-intuitive result when fusing
high conflict information. This paper proposes an improved method to solve this problem. By reassigning weight factors before
fusing, the method can give reasonable results especially when the initial weight factors of conflict evidences are almost
equal. It gives an adjustable factor to adjust the reassigning force. An example is given to illustrate these advantages.
This paper was recommended for publication in revised form by Associate Editor Eung-Soo Shin
Rui Sun, PhD candidate. He received M.E. in mechatronics engineering from University of Electronic Science and Technology of China.
He is currently a Ph.D. candidate in School of Mechatronics Engineering, University of Electronic Science and Technology of
China. His research interests include system reliability analysis and mechanical fault diagnosis.
Hong-Zhong Huang is a full professor and the Dean of the School of Mechanical, Electronic, and Industrial Engineering at the University of
Electronic Science and Technology of China, Chengdu, Sichuan, China. He has held visiting appointments at several universities
in Canada, USA, and elsewhere in Asia. He received a Ph. D. degree in Reliability Engineering from Shanghai Jiaotong University,
China. His current research interests include system reliability analysis, warranty, maintenance planning and optimization,
and computational intelligence in product design.
Dr. Qiang Miao obtained B.E. and M.S. degrees from Beijing University of Aeronautics and Astronautics and Ph.D. degree from University of
Toronto. He is currently an associate professor of the School of Mechanical, Electronic, and Industrial Engineering, University
of Electronic Science and Technology of China, Chengdu, Sichuan, China. His current research interests include machinery condition
monitoring, reliability engineering, and maintenance decision-making. 相似文献