基于物理模型的数据管理系统实现

【作者】 李秀勇；

【导师】 侯晓林；

【作者基本信息】 山东大学 ， 机械电子工程， 2005， 硕士

【摘要】 进入二十一世纪后,随着经济的全球化,中国正在加速成为世界的“制造工厂”之一。大量的制造企业为了在激烈的市场竞争中占有一席之地,必须在保证质量的前提下,尽量缩短产品研发周期。现有的产品建模和设计方法在以下方面存在不足:1.仅仅能描述几何信息,而产品设计过程受到诸多非几何因素的制约;2.忽视了设计过程经验的利用。对于大多数制造企业来说,如何利用现有的资源尽可能地发掘对设计有用的经验信息是十分现实的问题。在研究了国内外建模理论现状后,我们提出了物理模型的概念。它与现有CAD系统的几何模型、拓扑模型,特别是装配模型结合起来,便可以描述和记录机械零、部件的几何信息、拓扑信息、装配信息以及产品的载荷等物理、力学信息。而在物理模型基础上进行合理化设计则是对产品设计理论的一个突破。本文旨在建立一个在物理模型基础上的数据管理系统,通过对合理化设计过程中的相关设计信息进行有效的组织,就能实现数据的共享,特别是设计经验的利用。课题在CAD软件Pro/Engineer平台上进行开发。通过对系统的开发和工程实例的应用,可以证明基于物理模型的合理化设计数据管理系统能有助于实现数据的集成和共享,有助于缩短产品研发周期,提高企业的市场竞争能力。 本文分六章层层展开。详细介绍了基于物理模型合理化设计数据管理系统的数据管理模型,系统体系结构,设计信息的捕获、组织,并通过工程实例介绍了设计信息的利用。第一章主要介绍了课题提出的背景,分析了现有设计理论和方法的不足,指出了它们在信息集成、利用方面存在的缺陷,明确了基于物理模型合理化设计方法的目标,指出了课题研究的关键问题——经验利用,并安排了全文的工作;第二章简要介绍了产品建模方法的发展,明确了物理模型自上而下、逐步求精的设计思想;第三章介绍了物理模型,包括物理模型的定义、体系结构、数据结构、主要功能模块,最后指出在物理模型基础上进行合理化设计的必要性;第四章介绍了合理化设计的经验管理模型,进而从更广的层面上给出了设计数据的管理模型。还介绍了对设计信息进行版本管理的方法,为后面介绍数据管理系统的实现打下基础;第五章具体介绍数据管理系统的实现。首先给出了在物理模型基础上的数据管理系统的体系结构。接着从设计信息的捕获、组织方面进行了更多还原

【Abstract】 Influenced by the economic globalization, China is becoming one of the world’s "Manufacturing plants" at a faster pace since the very beginning of this century. In order to survive in the drastic competition for the market, most manufactories have to shorten their product developing cycle on the premise of ensuring the quality of the products. However, the product designing methods and modeling in existence have some deficiencies, such as, 1. They can only describe geometric information, and the designing process is infected by many non-geometrical factors; 2. They ignore the utilization of designing experience which is gained during product designing process. For most of the enterprises, a very realistic problem is how to dig out from the present resources valuable experience that is useful for designing. After studying the present state of both domestic and foreign modeling theories, we propose the concept of PM (Physical Model), which, combining the geometric model, the topological model, and especially the assembly model of the present CAD system, can describe and record the geometrical, topological, and assembly information of mechanical parts, the load of product and other physical and mechanical information. Carrying out rationalized designing on the basis of PM is a breakthrough to the product designing theory. This paper intends to build a data management system based on the PM. By effectively organizing the related design information during the rationalized designing process, the data could be shared, and, especially, the designing experience could be utilized. This research is made on the Pro/Engineer platform. Through the development of this system and its application to engineering examples, it can be proved that the data management system for rationalized designing which is based on the PM could conduce to the realization of integrating and sharing of design data, shortening product developing cycle, and improving the enterprises’ competing ability.This paper is developed in 6 chapters and introduces at length the data management model, the system structure, the capture and the organization of data, which are all included in the data management system for rationalized designing basedon the PM, and also introduces through engineering example the utilization of design information. The 1st chapter presents the background in which the theme is put forward, analyzes the deficiencies of the designing theories and ideas in existence, points out their limitations in integrating and utilizing information, determines the aim of the rationalized designing idea, indicates the key problem to be studied in the theme, i.e., experience utilization, and arranges the work for the whole paper. The 2nd chapter briefly summarizes the development of product modeling ideas, confirms the idea of top-down designing in pursuit of precision gradually. The 3rd chapter introduces the PM, including the definition, the system structure, the data structure, and the main function modules, and then indicates the necessity of rationalized designing based on the PM. The 4th chapter deals with the experience management model of rationalized designing, and further gives the designing data management model in a broader sense; it also introduces a version management method for design information, which lays a foundation for the implementation of the data management system based on PM. The 5th chapter introduces the implementation of the data management system in detail. First, it introduces the system structure of the data management system based on PM, and then particularly discusses information capture and organization. Through an engineering example - the reducer designing process, the 6th chapter demonstrates how the system captures, organizes, and utilizes the design information, and further validates the feasibility of the research. Finally, the paper makes a summarization to the theme and gives an expectation.更多还原