基于Agent技术的辊弯成型过程系统结构模型研究
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摘要
目前广泛应用于国民经济各个领域的冷弯型钢是一种低能耗的截面轻型薄壁钢材。辊弯成型是生产冷弯型钢的重要方法之一,是一种复杂的钢带深加工方法。其复杂性表现在变形过程是材料、几何以及接触边界等一系列非线性的弹塑性大变形过程,并且变形过程的影响因素非常多。因此,对辊弯成型过程进行深入的、系统的理论研究,揭示变形过程中的成型规律,开发一套可以模拟成型过程并能够指导实际生产过程中孔型设计的计算机辅助设计软件,既具有重大的理论意义,又具有一定的实用价值。
     多Agent系统起源于分布式人工智能,正由探索性研究向着实用化方向发展。Agent组织是多Agent系统的一种特殊形式,基于Agent组织的求解可以减少系统的内部冲突,扩展个体Agent的认知能力和物理能力,是一种十分有效的问题求解方式。将多Agent理论与技术应用到冷弯成形过程的分析和研究中,可以提高冷弯成形过程分析的信息化和智能化水平。
     首先,系统分析了Agent与多Agent系统的研究和应用现状,尤其是在制造业等相关领域的应用现状。综述了国内外关于辊弯成型工艺技术、成型理论和成型过程信息化的研究进展情况以及冷弯型钢的生产现状。
     其次,在总结Agent组织的特点后,建立了一种包含抽象层和实例层的Agent组织模型,分析了抽象层、实例层的组成以及Agent组织的实例化过程和形成机制。Agent间的通信是Agent组织内部或不同的Agent组织之间实现知识与信息共享、进行交互与协商,进而分工合作解决复杂的问题的根本途径。比较了多种Agent通信语言,选择了KQML语言作为Agent组织中的Agent通信语言,并根据样条有限条法的应用需要扩充了KQML原语。
     再次,结合Agent组织的特点进一步完善了基于修正的拉格朗日法的弹塑性大变形样条有限条法及其相应的计算列式。为了在保证计算精度的基础上提高系统的运行效率,在均分样条区域的基础上选择接触性特征有限条并分析了特征有限条对非特征有限条的影响。
     最后,将Agent组织应用到样条有限条法中,建立了一个基于Agent组织的样条有限条法模型。根据该模型将辊弯成型理论与辊弯成型设计、数值模拟有机的集成到一起,初步建立了一个具有智能性的计算机辅助设计仿真系统。使用该系统模拟了普通槽钢的成型过程,并将实验结果与文献数据进行比较,验证了模型的正确性。
Now, cold-formed steel is a low energy light thin-walled steel cross-section, which is widely used in various fields of national economy. Roll forming is not only an important method of production of cold-formed steel, but also a complex method of the steel processing. The complexity shown in the deformation processes is the material, geometry and exposure of the border and a series of non-linear elasto-plastic large deformation, and there are many influential factors on the deformation process. Therefore, the roll forming process of in-depth, systematic theoretical study reveals the shape deformation rule, and develops a suit of simulating the process of shaping and instructs computer-aided design software of practical production process, which have both significant theoretical significance and some practical value.
     Multi-Agent system originated in distributed artificial intelligence, and developed from the exploratory research to practical direction. Agent organization is a special form of multi-Agent system, Agent-based solution can reduce the system internal conflicts, and expand the individual Agent's cognitive ability and physical ability. Multi-Agent theory and technology applied to the analysis and research of cold forming process, which is able to improve the analysis of cold forming process information and intelligence level.
     Firstly, Agent and multi-Agent systems research and application status was analyzed, in special, the application status of manufacturing and other related fields. On the roll forming technology, forming the molding process of information theory and the research progress and cold-formed steel production status were summarized in this paper.
     Secondly, the organizational structure of the agent layer of abstraction, the instance layer, the instance process and mechanism of agent organization is constructed by analyzing agent organization. Agent communication is between the within of agent organization or different organizations to achieve knowledge and information sharing, interaction and consultation, and is a fundamental way of division of labor to solve complex problems. Choosing Language KQML as communicating language by deeply studying a variety of agent communication language, and expanding the KQML primitives based on the application demands of spline finite strip method.
     Afterwards, the modified Lagrangian method based on elastic-plastic large deformation spline finite strip and the corresponding computed column type is future improved by combining with the characteristics of agent organizations. In order to improve the system efficiency by ensuring the accuracy of computing, on the basis of regional sharing spline, choosing the contact characteristics finite strip, and analyzing the characteristic finite strip which impacted on the non-characteristic finite strip.
     Finally, applying the spline finite strip method to agent organization, and spline finite strip method model is established based on agent organization. On the basis of roll forming theory in knowledge repository, integrating the roll forming design with numerical simulation organically, an intelligent computer-aided design simulation system was established. Simulating the forming process of the normal channel by using the spline finite strip system, and verifying the correctness of the spline finite strip method model by comparing the results with document data.
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