机械产品设计知识建模及应用

发布时间：2018-05-20 13:05

本文选题：知识建模 + 知识重用　；参考：《浙江大学》2011年硕士论文

【摘要】：在当前以顾客为导向的市场环境下,多元化和个性化的客户需求使得产品复杂性增加、设计周期缩短、产品更新加快,这给企业产品设计提出了很大的挑战。如何对众多产品知识进行高效地管理与利用,以提高产品设计的效率与质量,是企业保证其竞争力的关键。针对国内机械类企业尤其是中小企业中存在的设计知识管理混乱、产品开发周期长、知识重用率低等问题,本文将进行以下研究： 1.在归纳现有机械类产品设计知识的基础上,提出了基于本体的知识表达,通过特征类概念、过程类概念、原理类概念以及实例类概念组成的四元本体对机械类产品知识进行表示,并给出了知识表示模型的搭建流程,从而使得机械类产品知识具有一个规范性的描述。 2.针对机械类产品的结构特点,本文提出了组合特征的实例搜索策略,并采用最近相邻算法与知识引导法相结合的方式进行实例相似度计算,通过基于K-均值的权值算法对特征相似度权值进行智能学习,实现产品相似实例快速准确的检索。 3.利用Petri网对产品设计过程进行建模,针对传统Petri网存在的缺点提出了两点改进,一是提出了Petri块的概念,用以缩小Petri网的规模,使得Petri网模型具有多层建模功能；二是对变迁加以谓词模块,以提升变迁的逻辑处理能力。在上述两处改进的基础上,提出了相应的机械类产品设计过程的Petri网建模方法。 4.文章最后,基于原有的PDM系统,以Visual Studio作为开发环境,SQL Server作为数据库系统,并用文中提出的知识建模方式开发摩托车制动器设计系统。
[Abstract]:In the current customer-oriented market environment, diversification and individuation of customer demand increase the complexity of products, shorten the design cycle, and accelerate product renewal, which brings a great challenge to enterprise product design. How to efficiently manage and utilize the knowledge of many products in order to improve the efficiency and quality of product design is the key for enterprises to ensure their competitiveness. In order to solve the problems of confused design knowledge management, long product development cycle and low knowledge reuse rate in domestic mechanical enterprises, especially in small and medium-sized enterprises, this paper will carry out the following research: 1. On the basis of summarizing the existing knowledge of mechanical product design, this paper puts forward the knowledge representation based on ontology, which is based on the concept of feature class, the concept of process class, the concept of feature class and the concept of process class. The concept of principle class and the concept of example class are composed of quaternion ontology to express the knowledge of mechanical product, and the process of building knowledge representation model is given, which makes the knowledge of mechanical product have a normative description. 2. According to the structural characteristics of mechanical products, this paper proposes a case search strategy based on combinatorial features, and uses the nearest neighbor algorithm and knowledge guidance method to calculate the similarity of cases. Based on the K- mean weight algorithm, the feature similarity weights are intelligently learned, and the product similarity examples can be retrieved quickly and accurately. 3. Petri net is used to model the product design process. Two improvements are put forward in view of the disadvantages of traditional Petri net. Firstly, the concept of Petri block is put forward to reduce the scale of Petri net and make the Petri net model have multi-layer modeling function. Second, predicate module is used to improve the logic processing ability of transition. Based on the above two improvements, a corresponding Petri net modeling method for mechanical product design process is proposed. 4. Finally, based on the original PDM system, using Visual Studio as the development environment, SQL Server is used as the database system, and the motorcycle brake design system is developed with the knowledge modeling method proposed in this paper.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH122

【引证文献】