共查询到18条相似文献,搜索用时 156 毫秒
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陈明 《计算机工程与设计》2010,31(14)
目前的桥梁安全受控主要面向桥梁全寿命期内的单一阶段,不能反映桥梁安全受控的本质.桥梁全过程安全受控以支持群体间的协同工作为目标,通过模型调整建立了桥梁有限元模型与桥梁状态的对应关系,建立了基于有限元模型的群体协同工作模式,并提出了协同工作实施过程的敏感性参数选择算法、模型调整算法、过程解析算法,实现了有限元分析系统与安全受控系统的集成.算例分析表明,全过程安全受控能够将分阶段实施的桥梁安全受控转化为多群体参与的协同安全受控,有助于提高桥梁安全受控的效率和质量. 相似文献
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陈明 《计算机工程与设计》2012,33(7):2896-2901
针对桥梁协同设计中群体间的信息共享需求,从协同设计的数据动态管理模式角度对信息共享的理论与方法进行了研究,分析了结构设计群体与抗震设计群体之间的协同工作过程,完成了含原子数据、组合数据、构件、有限元模型、子结构、结构等设计信息的数据表达模型.研究了含数据变换和动态激励的数据管理方法,满足了协同工作群体间信息共享的需求.以某连续梁桥为例,模拟分析结构设计群体与抗震设计群体间的协同工作过程,对动态管理模式的可实施性进行了验证. 相似文献
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基于TCPN的产品协同设计过程时序逻辑推理研究 总被引:1,自引:0,他引:1
针对具有动态、并发、不确定性特点的协同设计过程的设计活动模糊时间推理问题,基于时间约束Petri网理论,建立一种产品协同设计过程模型及其时间约束关系模型.通过分析协同设计过程的时间约束类型,提出了协同设计活动间的时间约束触发规则与推理机制,以及不同触发规则下的时间运算关系;最后通过一个链式输送机协同设计过程实例,验证了文中模型的相关结果,并开发了一个基于时间约束Petri网的协同设计过程时序推理仿真系统. 相似文献
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协同设计环境下的版本管理模型 总被引:7,自引:0,他引:7
计算机支持协同设计(computer supported cooperative design)是计算机支持协同工作CSCW的一个应用领域,也是CAD技术在未来发展的趋势。由于协同设计中多个人员共同参与设计,必然引进约束来保证协同。需要对设计对象和约束进行协调管理。协同设计中设计对象存在着多个版本。如何保证约束和设计对象版本间的一致对于协同设计的顺利进行具有重要意义。针对这些特点,作者提出了一种基于约束的层次化的管理协同设计版本的模型。 相似文献
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PADS──一个基于几何推理的参数化设计系统 总被引:5,自引:0,他引:5
PADS是一个基于几何推理的参数化设计系统。该系统采用一面向对象的数据模型统一表示几何元素与几何约束;基于一个普通算法实现几何推理,并且推理算法采用了一个更加适合于几何推理的推理策略;系统的参数变动处理通过局部的几何推理,将尺寸变动后的重新计算限制在局部范围;为减轻用户的输入负担,系统具备几种有效的输入与建模手段。 相似文献
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PADS—一个基于几何揄的参数化设计系统 总被引:5,自引:1,他引:4
PADS是一个基于几何推理的参数化设计系统,该系统采用一面向对象的数据模型统一表示几何元素与几何约束;基于一个普通算法实现几何推理,并且推理算法采用了一个更加适合地几何推理的策略;系统的参数变动处理通过局部的几何推理,将尺寸变动后的重新计算限制在局部范围;为减轻用户的输负担,系统具备几种有效的输入与建模手段。 相似文献
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针对协同设计冲突无法准确全面检测的问题,提出了一种基于约束的冲突检测模型。在分析了协同设计中约束分层和约束满足问题的基础上,该检测模型将约束划分为已知约束关系集合和未知约束关系集合两部分,分别对其进行冲突检测。采用区间传播算法验证已知约束关系集合;提出用免疫算法优化反向传播(BP)神经网络来模拟未知约束关系集合进行冲突检测,并与遗传算法优化BP神经网络进行对比,收敛速度提高了62.96%,证明了算法具有较快的收敛速度和较强的全局收敛能力。为实现计算机支持的冲突检测,研究了基于可扩展标记语言(XML)文档的约束关系集合表达方法,设计了基于约束满足的冲突检测系统的架构体系,并以C#和Matlab为平台开发了行星齿轮箱协同设计冲突检测系统。最后,通过实例验证了冲突检测模型的可行性和有效性。 相似文献
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几何因果定性推理的基本原理和算法 总被引:1,自引:0,他引:1
因果定性推理是一种通过分析描述物理系统行为和关系的约束找出系统内部各个成分之间的因果结构的推理方法.本文提出一种基于约束和变量分析的因果定性分析模型和算法.该方法在产品设计中有广泛的应用,利用这个模型和算法可较好地解决参数化设计中的几何推理问题,还可用作概念设计的工具,用于完成复杂系统设计任务的划分及定序、设计变量之间相互依赖关系分析等工作.算法具有应用性强、效率和稳定性好、支持欠约束和多解问题等优点. 相似文献
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协同设计中的并行冲突检测算法 总被引:7,自引:0,他引:7
冲突是协同设计的本质,产生的原因是协同设计环境下不同设计群体考虑问题的角度、评价标准和专业知识有所不同。提出了对等式协同设计中操作序列的一致性模型,在操作序列一致性的基础上提出了基于几何级的冲突检测算法,并在此基础上实现了系统设计冲突检测原型系统。 相似文献
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Aiming at the deficiencies of analysis capacity from different levels and fuzzy treating method in product function modeling of conceptual design,the theory of quotient space and universal triple I fuzzy reasoning method are introduced,and then the function modeling algorithm based on the universal triple I fuzzy reasoning method is proposed.Firstly,the product function granular model based on the quotient space theory is built,with its function granular representation and computing rules defined at the same time.Secondly,in order to quickly achieve function granular model from function requirement,the function modeling method based on universal triple I fuzzy reasoning is put forward.Within the fuzzy reasoning of universal triple I method,the small-distance-activating method is proposed as the kernel of fuzzy reasoning;how to change function requirements to fuzzy ones,fuzzy computing methods,and strategy of fuzzy reasoning are respectively investigated as well;the function modeling algorithm based on the universal triple I fuzzy reasoning method is achieved.Lastly,the validity of the function granular model and function modeling algorithm is validated.Through our method,the reasonable function granular model can be quickly achieved from function requirements,and the fuzzy character of conceptual design can be well handled,which greatly improves conceptual design. 相似文献
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Yuanhao Xu Guofu Yin Yong Nie Zhengwei He Xiaolin Dai 《Journal of Network and Computer Applications》2013,36(6):1418-1430
The quality of a knowledge service influences the quality, efficiency and innovation of product conceptual design. Existing approaches lack intelligence and individuation when providing a knowledge retrieval service via rules and cases. In this paper, we propose a framework of an active knowledge service based on collaborative intent capture to assist product conceptual design. First, a collaborative intent capture model is constructed through the study of the expression and capture of collaborative intent; second, a framework and a process of active knowledge push based on collaborative intent capture are designed after analyzing the method of knowledge resources acquisition based on the constraint satisfaction theory. Finally, match algorithms for text content are studied. Based on the above research achievements, a prototype system of a collaborative design and active knowledge service platform (C-AKSP) has been developed for providing a knowledge service and assisting product conceptual design. An example, the conceptual design of a machine tool spindle system, is used to validate the proposed theories for the model, the framework and the algorithm. As a result, C-AKSP can provide a superior knowledge service that meets the designer's knowledge needs. 相似文献
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This paper presents a new system framework for collaborative top-down assembly design. Different from current computer-aided design (CAD) systems, the framework allows a group of designers to collaboratively conduct product design in a top-down manner. In our framework, a multi-level and distributed assembly model is adopted to effectively support collaborative top-down assembly design. Meanwhile, fine-granularity collaborative design functionalities are provided. First, the coupled structural parameters involved in the distributed skeleton models of the product can be collaboratively determined by the correlative designers based on fuzzy and utility theory. Second, agent based design variation propagation is achieved to ensure the consistency of the multi-level and distributed assembly model during the whole design process. Third, collaborative design of assembly interfaces between the components assigned to different designers is supported. The prototype implementation shows that our framework works well for supporting practical collaborative top-down assembly design. 相似文献
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A reasoning method for a ship design expert system 总被引:4,自引:0,他引:4
Abstract: The ship design process is a highly data‐oriented, dynamic, iterative and multi‐stage algorithm. It utilizes multiple abstraction levels and concurrent engineering techniques. Specialized techniques for knowledge acquisition, knowledge representation and reasoning must be developed to solve these problems for a ship design expert system. Consequently, very few attempts have been made to model the ship design process using an expert system approach. The current work investigates a knowledge representation–reasoning technique for such a purpose. A knowledge‐based conceptual design was developed by utilizing a prototype approach and hierarchical decompositioning. An expert system program called ALDES (accommodation layout design expert system) was developed by using the CLIPS expert system shell and an object‐oriented user interface. The reasoning and knowledge representation methods of ALDES are explained in the paper. An application of the method is given for the general arrangement design of a containership. 相似文献