【作者】 邓彪；

【导师】 谷正气；

【作者基本信息】 湖南大学 ， 车辆工程， 2007， 硕士

【摘要】 随着消费者要求的逐渐多样化,各大汽车企业之间的竞争也日趋激烈,如何最大地缩短设计周期,减少设计成本,提高设计效率成了各汽车企业迫切之需。计算机支持的协同设计CSCD (Computer Supported Cooperative Design)技术的出现为汽车企业解决这些问题提供了技术基础,该技术能够使汽车企业快速的开发出新产品来满足客户的需求,以适应日益剧烈的市场竞争。本文针对汽车企业中各零部件供应商可能采用的不同CAD系统,就如何实现这些异构CAD系统间同步协同设计方法开展了研究。为了让异构CAD系统支持同步协同设计活动,提出了一种基于中性特征对象(NFO)的同步协同设计平台构建方法,并给出了这种中性特征对象的具体构建原则;该方法通过中性特征对象在异构CAD系统间实时交换系统的特征操作,有效地解决了异构CAD系统在数据结构和建模操作上的差异问题。详细的分析和设计了同步协同设计原型系统中转换器的结构和其子功能模块,并针对协同设计中的冲突问题,以及在协同设计中当CAD特征对象与中性特征对象不能匹配的问题进行了比较详细的研究和探讨。此外,本文针对协同平台中的需求对数据库进行了设计,提出采用将零件模型的临时版本和最终版本分别用基于NFO文件和基于STEP标准的数据库方式存储的方法,该方法即较好的解决了在零件设计阶段协同任务可以不连续进行的问题,又保证了零件的CAD模型能与下游软件更好的集成。最后本文利用二次开发技术初步构建了一个协同设计原型系统,并用某汽车零件的协同设计实例验证了本文方法的有效性。更多还原

【Abstract】 With the demand of consumers becoming divers gradually, the competition among automobile enterprise turns much fiercer. And it is very urgent for these enterprises to solve the problems such as how to shorten the design cycle, reduce the design cost and enhance the efficiency of design. The appearance of CSCD (Computer Supported Cooperative Design) supplies a technological foundation for the enterprise to solve above problems; it enables these enterprises to develop new products quickly so as to meet the needs of customers and survive in the violent market. In order to enable it, this thesis mainly researches on the approach to constructing synchronized collaborative design platform within heterogeneous CAD systems to every spare part supplier of automobile enterprises may adopt different CAD system.A Neutral Feature Object based approach to building up a synchronized collaborative design platform upon heterogeneous CAD systems is proposed. It can make the CAD systems support the activity of synchronized collaborative design. And the constructible principles of Neutral Feature Object are given. This method exchanges the feature operation of the CAD system real time through Neutral Feature Object, and it can solve effectively the problem which the heterogeneous CAD system has different data structure and modeling operation. The structure and sub-module of the Exchange-Feature are designed elaborately. Moreover, the problem that the CAD Feature Object (CFO) can’t match with Nature Feature Object (NFO) has been researched and discussed.Furthermore, the database for the need of collaborative design platform is designed, and a better method memorizing the temporary and final version of part models based on NFO and STEP files respectively is proposed. The method not only makes the design of parts un-continually but also ensures the CAD model of parts can be integrated better with downstream software. Finally, a prototype system of synchronized collaborative is constructed. Meanwhile, a synchronized collaborative design instance of a rocker arm part is performed and the validity of approach in this paper is certified.更多还原