基于钢板矫直专家系统的研究与开发
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摘要
众所周知,钢铁工业是我国乃至世界各国的基础工业之一,然而钢板的生产又是钢铁工业生产的重中之重,所以钢板的生产就显得非常重要。随着我国工业技术的发展,用户不仅对钢材的需求量日益增大,而且对钢材的精加工也提出了更高的要求。2250中厚板剪切生产线正是在这样的需求下研制而成的,而钢板矫直专家系统则是针对该剪切线控制系统中钢板矫直部分研制的。
     钢板在轧制等过程中,由于各种原因,必然产生不同程度的塑性变形,因此必须对钢板进行矫直加工,使之成为合格产品。由于钢板矫直过程很复杂,并且大量的问题具有明显的经验性、模糊性和不确定性,所以难以用传统的数学方法准确地定义和描述。专家系统却可以使操作者和工程师的知识和专家技能与数学模型有机地结合起来,使用和处理不完全的信息,因此我们研究和开发了钢板矫直专家系统。
     课题研究的过程中,我们对大量的专家知识、规则及相关数据进行了搜集和整理,对该系统进行了整体设计。基于ACCESS数据库建立了数据库,主要有板厚数据库、板宽数据库等,其中存储板材的板厚、板宽等有关物理参数以及板材的屈服强度和弹性模量等机械性能参数;将矫直规则和事实等知识存储起来,并可以通过查询机构对知识进行查询,还可以通过知识编辑方式来完成专家知识的建立、增加、删除和修改工作。在钢板矫直的过程中,由于矫直辊受损等不确定因素的影响,用传统的矫直模型来计算下压量,有时不能达到要求,矫直效果不好,因此我们引入神经网络模型对传统的推理过程进行了改进,从而对矫直辊的下压量给予了修正。
     在钢板矫直方面的专家系统还没有被开发研制,因此从当前国内外对钢板的需求和国内的钢板矫直技术来看,研制这样一个专家系统能提高钢板矫直质量及自动化程度,从而提高我国板材的生产效率及质量。
It is known that iron and steel industry is one of the foundation industries of our country and the other countries all over the word. However the production of steel plates is of consequence in iron and steel industry. With the development of our country industry, users not only require the steels increasingly, but also demand highly finish machining. The product line of 2250 cutting steel plates is developed rightly in such requirement. And that Expert System in Straightening Plates is developed aiming at the control system in cutting steel plates.
    In rolling steel plates, the plates will produce deformation for all kinds of reason. So straightening plates is being processed in order that they can turn into eligible products. The process of straightening plates is intricate and many problems are experiential, fuzzy and uncertain, hence it is difficult that they is defined and described by using the mathematic method. Expert system can combine the knowledge and the mathematic model and make use of the incomplete information. Therefore, we developed Expert System in Straightening Plates.
    During the course of researching the problem, we do a lot of work. First of all, a large quantity of knowledge of expert, rules and data in point are collected and cleared up. Then the system is generally designed and leading task is analyzed in order that the system is applied effectively. We found the steel plate databases based ACCESS database, which have the plate thickness database, the plate width database and so on. There are parameters about the steel plates, such as plate thickness, plate width, bend intensity, elasticity modulus and so forth. The straightening knowledge is stored and may be consulted by corresponding organ. Furthermore, the knowledge is founded, added, deleted and amended. In straightening plates, the press values are inaccurate by conventional straightening mode. So neural network mode is introduced in order to improve the inferential process and amend the outputs.
    The expert system in straightening plates has never developed. So the expert system can improve the precision and automation in straightening plates in the field of straightening plates. Consequently, the production efficiency and quality in steel plates in our country are also improved.
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