共查询到20条相似文献,搜索用时 15 毫秒
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银行家算法在柔性制造系统中的改进和应用 总被引:1,自引:0,他引:1
提出了一种应用于柔性制造系统中的避免死锁的算法。该算法是对银行家算法的改进。银行家算法适用于操作系统,而操作系统与柔性制造系统之间存在差异,为使该算法适用于柔性制造系统,必须对其进行改进。通过研究操作系统中的进程与制造系统中的加工任务之间的差别,对算法进行改进。对制造系统采用形式化的建模方法,将建立的模型转换成适合进行模型检查的形式。运用SPIN来对此算法进行仿真,并验证此算法模型的正确性。 相似文献
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面向网络化制造的动态自组织制造资源模型的研究 总被引:8,自引:1,他引:8
在分析网络化制造模式下制造资源模型新的特点的基础上,提出应用STEP、面向对象和XML等技术,定义适用于网络化制造的制造资源模型标注语言——MRMML,构建基于MRMMI,的动态自组织制造资源信息模型。分析了应用STEP和面向对象技术构建的制造资源模型、STEP Express模型到XML Schema映射的实现机制、MRMML Schema表示模式,以及基于MRMML动态自组织制造资源模型的框架构建等关键技术。开发了基于MRMML的制造资源数据转换模块,实现了制造资源信息基于网络的传输、共享和交互。 相似文献
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制造系统的物能资源流模型 总被引:5,自引:2,他引:5
指出制造系统中物能资源问题的重要性,从制造系统的主要运行环节和制造系统的物料流等两个方面的分析制造系统中物能资源消耗状态的影响因素,最后建立了一种制造系统的能资源模型。 相似文献
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基于多维度分析的制造资源集成与共享 总被引:1,自引:3,他引:1
为满足网络化制造对制造资源的特殊需求,参考航空工业标准,从生命周期、应用视图和聚合粒度3个方面对制造资源进行多维度分析。利用国际万维网联盟推荐的资源描述方法,对多维度制造资源模型进行了基于网络本体语言的形式化描述,并通过斯坦福大学的本体建模工具构建了制造资源多层次、多视图、全生命周期的网络本体模型。最后,通过惠普语义网络实验室的本体接口函数,完成了制造资源网络本体语言文件与关系型数据库相互转换,实现了网络环境下制造资源工程数据及时有效的共享。 相似文献
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Jarir K. Chaar Daniel Teichroew Richard A. Volz 《International Journal of Flexible Manufacturing Systems》1993,5(1):53-88
The complexity and diversity of manufacturing software and the need to adapt this software to the frequent changes in the production requirements necessitate the use of a systematic approach to developing this software. The software life-cycle model (Royce, 1970) that consists of specifying the requirements of a software system, designing, implementing, testing, and evolving this software can be followed when developing large portions of manufacturing software. However, the presence of hardware devices in these systems and the high costs of acquiring and operating hardware devices further complicate the manufacturing software development process and require that the functionality of this software be extended to incorporate simulation and prototyping.This paper reviews recent methods for planning, scheduling, simulating, and monitoring the operation of manufacturing systems. A synopsis of the approaches to designing and implementing the real-time control software of these systems is presented. It is concluded that current methodologies support, in a very restricted sense, these planning, scheduling, and monitoring activities, and that enhanced performance can be achieved via an integrated approach. 相似文献
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自组织制造网格及其任务调度算法 总被引:33,自引:9,他引:33
通过分析制造系统自组织的特征,以及网格技术在制造业应用的理论基础和系统框架,提出了自组织制造网格的概念,指出资源动态管理和调度是自组织制造网格中建立虚拟组织、实现资源共享和协同工作的瓶颈点,提出基于T,Q,C,S的多层次、多目标整数规划调度算法。同时,结合自组织制造网格的应用实例和一个具体的加工任务,验证了自组织制造网格理论的合理性和调度算法的可行性。 相似文献
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为快速、精确地从云制造平台资源池中搜索到满足用户需求的资源,实现资源与需求的高效匹配,提出了一种资源需求高效匹配策略。首先,建立了资源与需求的形式化描述模型,在此基础上,采用改进的K-means聚类算法按基本信息进行聚类,对云服务池中的资源进行预处理,形成多个资源簇;其次,计算用户需求与各资源簇聚类中心基本信息的相似度,确立备选资源簇;最后,再分别从资源的状态信息、功能信息和服务信息3个方面对备选资源簇中的备选资源进行筛选匹配。实例分析和研究结果表明:与已有的匹配方法相比,该方法在保持较高匹配精度的同时具有更高的匹配效率。 相似文献
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蚁群算法及灰色理论在制造资源配置中的应用 总被引:1,自引:0,他引:1
为了优化网络化制造环境下的制造资源配置问题,提出了一种将灰色关联理论和蚁群算法相结合的资源优化选择求解方式.在该求解方式中,首先根据工艺规划将零件加丁任务分解为按照时间先后排列的工序集;然后在每个工序节点上利用灰色关联理论解决多目标决策问题中的优势,通过多层次灰色关联系数的确定,筛选出一定数量满足要求的候选制造资源,从而缩小问题域的范围;最后利用蚁群算法从运输成本角度出发,寻找零件加工最优的制造资源选择路径,以实现网络化制造中制造资源的优化配置. 相似文献
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基于物理制造单元的网络化制造资源建模研究 总被引:9,自引:1,他引:9
面向未来数字化制造模式 ,提出对企业制造资源分三层进行管理 ,即物理制造单元层、工作中心层和物理设备层 ;针对生产制造过程中各个应用环节对制造资源的需求 ,利用面向对象方法对物理制造单元从基本信息、制造能力信息、物理构成、状态信息和工装信息等五方面进行了建模研究 ;对于物理制造单元的制造能力信息分别面向逻辑制造单元和物理制造单元可加工零件类别进行建模 ;最后将该模型应用在网络化协同工艺系统和可重构制造资源优化配置平台中 ,给出了具体的应用方案。 相似文献
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从“他组织”走向自组织——关于制造哲理的沉思 总被引:3,自引:0,他引:3
剖析传统制造模式的弊端 ,从制造系统与制造过程的复杂性说明制造模式变革的必要性 ;比较了人造系统中传统的“他组织”模式与自然系统的自组织模式的优劣 ,论述了自组织的特点和机制 ;指出从“他组织”走向自组织乃是制造业走出困境的必由之路 ,自组织将是 2 1世纪的制造哲理 ,也是新一代制造系统的重要特征 ;探讨了自组织过程对于环境的影响 ,导出了“熵污染”的概念 ,指出了减轻“熵污染”的途径 ;列出了与自组织制造模式有关的研究课题及待解决的关键问题 ,并提出从有序度和熵的角度来认识、构造和运行制造系统的思路 相似文献
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Application of an Autonomous Agent Network to Support the Architecture of a Holonic Manufacturing System 总被引:4,自引:2,他引:2
Samrat Mondel M.K. Tiwari 《The International Journal of Advanced Manufacturing Technology》2002,20(12):931-942
To remain a competitive force in the world market, manufacturing enterprises must design and produce new products in an effective
way. To reduce the product launching time, manufacturing enterprises must be versatile, open to changes, and capable of designing
and modifying their own facilities and processes efficiently for the design of new products. In this context, the concept
of autonomous, adaptive, cognitive and cooperating entities known as "holons" is conceived which leads to the evolution of
a holonic manufacturing system (HMS) where highly distributed control paradigms are adopted to alleviate the problems related
to frequent process disturbances. In order to streamline the functioning of an HMS, it is necessary to form an efficient,
flexible and responsive network of agents, which are intra-holonic entities that inherit the same characteristics as the holons.
This network of agents can be termed an autonomous agent network. The agent is formed by the parties, which are the functional
units of the holonic manufacturing system. The aim of this paper is to specify the communication protocols and subsequently
synthesise and cluster the individual parties into autonomous agents in accordance with the basic constraints of a holonic
manufacturing system. Here a fuzzy c-means clustering algorithm is proposed to club the parties to capture effectively the
uncertainty and imprecision associated with them. Besides the grouping of the parties to form agents, the proposed fuzzy-based
clustering algorithm ensures that the agents formed are more amenable to the dynamic environment prevailing on the shop floor
of present day automated manufacturing systems and thus makes the essence of a holonic manufacturing system successful . Keeping
in mind the imprecision, uncertainty, and conflicting nature of objectives, the proposed approach aptly models the problem,
and its applicability is exemplified by a test problem.
ID="A1"Correspondance and offprint requests to: M. K. Tiwari, Department of Manufacturing Engineering, National Institute of Foundry and Forge Technology, Hatia, Ranchi
834 003, India. E-mail: mkt09@hotmail.com 相似文献
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Rapid one-of-a-kind product development 总被引:1,自引:1,他引:0
S.Q. Xie Y.L. Tu 《The International Journal of Advanced Manufacturing Technology》2006,27(5-6):421-430
In today’s global market, more and more manufacturing companies have realised that the ability to quickly develop a customised
product in an economic and efficient way is critical for them to survive in the keen competitive international market, particularly
for one-of-a-kind production (OKP) companies. A new generation of OKP systems needs to be developed to maintain competitiveness
in the global marketplace and to improve the ability to rapidly combine the strengths of manufacturing partners to meet market
needs. In this paper, the main objectives of rapid OKP development in the global manufacturing environment are discussed.
The background of recent approaches for rapid development of OKP products is reviewed. After systematically reviewing the
existing OKP systems and recent developments of new technology and systems, the authors discuss current issues and requirements
for developing a new generation of OKP systems for rapidly producing OKP products. At the end of this paper, a reference system
structure is proposed for rapid development of OKP products in the global manufacturing environment . 相似文献
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基于网络面向快速重组制造系统的CAPP技术研究 总被引:1,自引:0,他引:1
在研究网络环境下快速重组制造系统特点和对 CAPP系统功能需求的基础上 ,对实现基于网络面向快速重组制造系统的 CAPP体系结构进行了研究。在此基础上 ,研究了该 CAPP系统的实现方法 ,包括基于 Inter-net面向工艺设计的制造资源快速定制、基于 Internet的 CAD/ CAPP信息集成和基于 Web的通用化工艺设计推理决策机制等。开发了相应的原型系统 RR-CAPP系统 ,并通过实例对原型系统进行了实用性测试 ,证明系统运行可靠方便。 相似文献
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A. K. Jain R. G. Kasilingam S. D. Bhole 《The International Journal of Advanced Manufacturing Technology》1991,6(3):232-245
In this paper, we address the problem of planning the requirements of some of the important resources in flexible manufacturing
systems. Specifically, we model the problem of estimating the required numbers and types of machines and tools in the context
of a cellular layout. A two-stage procedure is developed which first forms the part families, using the complete-linkage clustering
method based on a new similarity index defined in terms of the tooling requirements, and then subsequently estimates the resource
requirements to manufacture the part families using an integer programming model. Several variations of the model are discussed
and a numerical example is given. 相似文献