Research On Collaborative Design In Parametric CAD Systems

This dissertation presents traditional design with parametric design and reviews the characteristics in some famous CAD and CSCW systems. The applications of CSCD, which increases design quality and saves development time of design process, have been the combination of both CSCW and CAD.Although many studies and investigations of parametric methods have been carried out, they are all suitable for general field rather than special one. As a result, it is very necessary and practical to apply parametric method in special field, which has special functions and structures. Based on object-oriented method and directed hypergraph theory this thesis analyzes the geometric constraints system in which graph unites and geometric constraints are denoted by classes and the hierarchy of classes. This model has the virtue of the directed hypergraph and is easy to be realized through object-oriented programming. It is also credit for its efficiency and reliability by focusing on the object-oriented technology through system analyzing, modeling and realizing. When it comes to model and realize the parametric CAD system of some corporations' series of productions, this model is perfectly proper. The method can also adequately exert the system's encapsulation and extension. The implementation indicates that the modeling is practicable, flexible and convenient for parametric designs. The conflict solution project, which includes conflict preventing, consistency model and version discussing, is put forward in Real-time collaborative graphic designing system, which is a promising class of Computer-Supported Collaborative Work (CSCW) system. Conflict resolution and operation consistency remains one of the core issues in this type of systems. It is defined that integer consistency and semantic consistency are two classes of the consistency in collaborative graphic design in this thesis. Sufficient condition of integer consistency and solution method of semantic consistency is proposed. The conflict solution model is based on the parametric graphic design. Based on the above research, this thesis adopts compound approach (client/sever) structure of CSCD and synchronization control strategy in phases, combining with example of tire bladder CAD collaborative design system, which discusses the structure modeling and implement.