Intelligent Cad Knowledge-based Automobile Welding Fixture Inference Engine System Design And Research

The system of Knowledge Based Computer Aided Design of Automobile Welding Jig was advanced, based on the abundant experience of designing welding jig and reading a great deal of research materials in this area. And the following listed task aimed at the reasoning system in this thesis was brought to success:1. The welding jig was classified and parametrical designed, on the groundwork of clearing up a mass of welding jig we have had. And more over, the parameters of property and dimension were picked-up. Based on which the Case Base of Automobile Welding Jig and its management system was constructed. The function of the system is made up of the Searching of Existing Welding Jig,Adding or Deleting the Case of Welding Jig.2. The Reasoning Method of Case Based is successfully used in The Reasoning Machine of the Knowledge Based Computer Aided Design of Automobile Welding Jig on the base of the constructed Base of Welding Jig. And the Vector Matching Arithmetic of Jig Case was achieved.3. The Reasoning Method of combining Rule Based and Model Base Reasoning was imported into the Reasoning System.4. The Knowledge Based system of computer aided design for automobile welding jig was carried out using the language of Visual C++, on the base of the UG NX CAD software platform and the object-oriented method of knowledge expression. The Management System of Automobile Welding Jig Case,the interface between the Reasoning System and the Knowledge Base,the Management System of project data. The system was succeeded in designing welding jig of a single work-station using the method of Knowledge Based.At the end of this thesis, we particularly introduced the designing method using this system by an example. By the finished study we can come to the conclusion that:1. The concept of Knowledge Base Design was firstly applied into the designing area of Automobile Welding Jig, and put forward the system and function of Knowledge Based Compute Aided Design of Automobile Welding Jig. And the structure of the system is proved to be reasonable and feasible. 2.The mixed reasoning method of combining Rule Based and Model Base and the Reasoning Arithmetic of Case Based is imported into the Reasoning System of Knowledge based CAD of Automobile welding jig. It is proved to be better for the Reasoning method for non-standard design of automobile welding jig by the program and example.3.Based on the designing knowledge of welding jig, the thesis constructed the Knowledge Base of Automobile Welding Jig, which consists of the Case Base,the Model Base,the Part-selecting-rule Base and Model-selecting-rule Base. The Knowledge Base is proved to be maturity by the program and example.