An expert system for diagnosing CNC-machines : a case study | |
| Author | Mahasan Thieravarut |
| Call Number | AIT Thesis no.IE-93-10 |
| Subject(s) | Expert systems (Computer science) Computer integrated manufacturing systems |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. IE-93-10 |
| Abstract | Efficient diagnosing of a CNC machine, considered a very important component of modern manufacturing system, requires so much knowledge and expertise that it is difficult or sometimes impossible to find human experts. An expert system is introduced to overcome this problem with an intelligent diagnostic system. The main objective for this study is the use of the logic interpretation of the ladder diagrams and the electrical diagrams of CNC machine to define the fault location. Other technical knowledge of CNC are also necessary to accomplish this process. The knowledge base of the prototype system developed in this study is production rulebased, it consists of approximately five hundred rules. A condition-based forward chaining concept and a rule ordering concept are designed. These concepts reduce the knowledge base size. ยท The diagnostic model used in this study is a hybrid reasoning between a deep model and a shallow model. The shallow model which represents the heuristic knowledge is provided in two different methods: a fault direct access heuristic and a heuristic for searching boundary generation (for the deep model). The structure and behavior of the CNC system or the deep knowledge uses the general deep reasoning strategy to locate the fault exactly. |
| Year | 1993 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. IE-93-10 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Industrial Engineering (IE) |
| Chairperson(s) | Bohez, Erik L.J.; |
| Examination Committee(s) | Tabucanon, Mario T. ;Batanov, Dentcho N. |
| Scholarship Donor(s) | The Siam Cement Co., Ltd. ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |