Network Utilization of Database for Product (Shape) Information Described Symbolically

如今，具有参数化建模功能的CAD系统正在实现，以支持产品生命周期中的原型设计、评估、制造、维护和回收等设计活动，并与分析和制造系统产生显著的联系。由系统生成的数据库存储实体模型，但不能按照设计者的意图显示模型的内容，除非用户通过CAD系统对模型进行检查。因此，我们的研究目标是在网络环境下建立一种方法，可以显示产品的特征和形状，搜索具有相似形状或功能的部件，显示设计师的意图或设计背景信息，并由多个设计师协同设计产品。主要研究成果如下：1。复合特征建模提出了一种处理由多个原始特征组成的复合特征的方法。该方法通过类似于产品模型的组合原始特征来表示复合特征，并将模型转换为XML文件，使设计人员能够在网络中使用它。我们还提出了搜索具有相似原始特征的复合特征和保护相同特征的重复配准的算法。网络协同设计我们利用JAVA开发了一个客户端/服务器系统，使设计人员能够在网络环境中设计同一产品，共享其数据库。如果多个设计师同时改变一个产品的形状，可能会在数据库中产生一些矛盾。因此，当另一个设计师正在改变形状的某些部分时，我们通过禁止在基于面部的表示中使用已注册的面孔列表来改变形状，从而对产品形状的一部分进行独占使用控制。具有美观自由曲面形状的装配设计、概念设计和参数化设计我们还研究了具有美观自由曲面形状的装配设计、概念设计和参数化设计的加工方法。少

Nowadays, CAD systems with parametric modeling functions are being realized to support design activities in the product lifecycle such as prototyping, evaluation, manufacturing, maintenance and recycle, and bring about a striking effect connected with analysis and manufacturing systems. The database generated by the systems store solid models but can not show the content of the model as the designer's intent unless users check the models through CAD systems. Therefore, our objective of the research is to establish methods in the network environments which enable to display characteristics of the product along with their shapes, to search parts having similar shapes or functions, to display designer's intent or design background information and to design products collaboratively by multiple designers.Main research results are shown as follows.1.Compound feature modelingWe propose a method for processing a compound feature which consists of multiple primitive features. The method represe … More nts a compound feature by combining primitive features similarly as a product model, converts the model to a XML file and enables designers to use it in the network. We have also proposed algorithms which search compound features with similar primitive features and which protect the duplicate registration of the same features.2.Collaborate design in the networkWe have developed a client/server system by JAVA which enables designers to design the same product sharing its database in the network environments. If multiple designers change a product shape at the same time, some contradictions might occur in the database. Hence we conduct exclusive use control for a part of the product shape by forbidding change of a shape with a registered list of faces in the face-based representation when another designer is changing some part of the shape.3.Assembly design, conceptual design and parametric design for shapes with esthetic free-form surfacesWe have also studied on processing methods for assembly design, conceptual design and parametric design for shapes with esthetic free-form surfaces. Less