面向大装配复杂CAD模型轻量化技术

发布时间：2018-11-25 20:45

【摘要】：随着现代化技术不断推陈出新,尤其是信息技术的飞速发展,世界制造业发生了重大变革,最显著的特征就是企业竞争中技术创新的主导地位日益突显。其中CAD/CAM技术的迅速发展,使得整个产品的设计、虚拟制造和数字化样机均可在计算机中完成,为企业的产品设计、制造和整个过程生产水平的提高带来了质的飞跃。在享受现代化成果的同时也产生了一个问题,现如今大数据容量的复杂装配体的设计已成为产品设计过程中极为重要的元素。三维模型结构越来越复杂,零部件及其自身特征数量繁多,所携带的信息量巨大,因此占用的空间也越来越大。计算机仅加载显示一项就耗时漫长,更是难以满足实时性处理要求。鉴于此当前有两个途径解决,一是提高计算机处理能力,包括发现和应用新型计算机材料、扩大硬件空间、加快网络传输速度,此途径效果可见但有很多限制,多数情况下仍然无法满足用户对系统的实时性处理要求。二是对CAD模型进行轻量化处理,这也是本文研究的重点。1、首先提出一种面向大装配复杂CAD模型轻量化方法,保持外观和数据组织不变的情况下使文件容量显著减小,切实有效地解决了工程领域轻量化方面的问题。依据本方法指导进行实际开发,本文讲述的复杂装配模型轻量化系统开发是在Visual Studio 2008平台下基于Pro/Toolkit对Pro/E进行二次开发,文中对开发的主要工具Pro/Toolkit以及MFC、动态链接库等进行了详细的介绍,同时也对Pro/Toolkit在Visual Studio 2008中的配置进行了说明。2、文章创造性技术有:一是零部件轻量化技术。要满足不同用户的需求,确保轻量化后的模型几何形状及拓扑结构与原始设计的一致性,在此基础上进行轻量化处理。二是基于轻量化组件的装配技术。对装配模型拓扑信息进行解析并提取,根据信息进行轻量化零部件的装配,并最终生成轻量化的整机装配模型。3、系统工具界面及菜单部分简单直观,分模块逐步完成功能实现,然后测试功能进行优化,最终完成复杂装配三维模型轻量化程序开发。使用本工具进行多组试验反向验证本文提出的模型轻量化方法的有效性和高效性。面向大型装配模型轻量化技术,能够为从产品的设计人员到最终产品制作人员提供极大的便利,大幅缩短了产品设计到生产过程中浪费在机器等待时间,降低了企业间协同交流作业难度,有效地提高模型设计效率及企业效益。
[Abstract]:With the rapid development of modern technology, especially the rapid development of information technology, great changes have taken place in the world's manufacturing industry. The most prominent feature is that the dominant position of technological innovation in enterprise competition is increasingly prominent. With the rapid development of CAD/CAM technology, the whole product design, virtual manufacturing and digital prototype can be completed in the computer, which brings a qualitative leap for the product design, manufacturing and the improvement of the production level of the whole process. While enjoying the achievements of modernization, a problem arises. Nowadays, the design of complex assembly with big data capacity has become an extremely important element in the process of product design. The structure of 3D model is becoming more and more complex, the number of parts and their own characteristics is various, the amount of information carried by them is huge, so the space occupied by them is more and more large. It takes a long time for a computer to load and display only one item, and it is even more difficult to meet the requirement of real-time processing. In view of the fact that there are two ways to solve this problem, one is to improve the ability of computer processing, including the discovery and application of new computer materials, the expansion of hardware space, and the acceleration of the transmission speed of the network. The effect of this approach is visible but has many limitations. In most cases, it still can not meet the real-time processing requirements of the system. The second is the lightweight processing of CAD model, which is also the focus of this paper. 1. Firstly, a lightweight method for large assembly complex CAD model is proposed, which can significantly reduce the file capacity while keeping the appearance and data organization unchanged. It effectively solves the problem of lightweight in engineering field. Under the guidance of this method, the light weight system of complex assembly model is developed on the Visual Studio 2008 platform based on Pro/Toolkit. The main tools Pro/Toolkit and MFC, are given in this paper. The dynamic link library is introduced in detail, and the configuration of Pro/Toolkit in Visual Studio 2008 is also explained. 2. The creative techniques in this paper are as follows: first, component lightweight technology. In order to meet the needs of different users and ensure the consistency of the geometry and topology of the lightweight model with the original design, lightweight processing is carried out on this basis. Second, assembly technology based on lightweight components. The topological information of assembly model is analyzed and extracted, and the assembly of lightweight parts is carried out according to the information. Finally, a lightweight assembly model of the whole machine is generated. 3. The system tool interface and menu are simple and intuitionistic. The function is realized step by modules, and the function is optimized by testing. Finally, the lightweight program of 3D model of complex assembly is developed. The effectiveness and efficiency of the model lightweight method proposed in this paper are verified in reverse by using this tool in multi-group experiments. Lightweight technology for large assembly models can provide great convenience from product designers to final product makers, and greatly reduce the waiting time wasted in the process of product design to production. The difficulty of cooperative communication among enterprises is reduced, and the efficiency of model design and enterprise benefit are improved effectively.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG95;TP391.72

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