Theory of Matter Element and its Engineering Applications

• Main Authors: Hsieh, Wu Shuang, 謝無雙
• Other Authors: Cha'o-Kuang Chen, Hsin-Yi Lai
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/79709281267661190650

碩士 === 國立成功大學 === 機械工程學系 === 86 === In mechanical engineering design, it's the frequently considered problem that how to choose the most suitable tool and materials in the preliminary stage of design. In studies forgoing, Tang [1988] proposed a model of material selection based on material cost and material quality. Other studies presented some economical model for raw material selection. However, these early studies face a problem frequently: the characteristics of different materials stated in the engineering design handbooks are multi-dimensional, qualitative and linguistic often. In fact, it's difficult for engineers to make accurate decisions only under linguistic information. This problem becomes more serious in multi-criteria decision-making models. So in the past few years, Fuzzy and Grey theory played an important role in this kind of vague decision making environment and successfully transferred this kind of problems into computer calculation approaches. However, time and tide waits for no man. Recently, the theory "Matter element analysis and the Extension set" presented by Professor Chai Wen [China] has offered another approach to this kind of problems. This approach not only comes out with the nearly same result provided by Fuzzy or Grey theory but the better one. It's capability of solving problems with conflicting and non-compatible criteria inside make it the most constructive methodology of the same kinds. By using this powerful weapon, not only we can get rid of the shortage of Fuzzy or Grey theory in dealing with this kind of multi-criteria problems but also find out that it's easier for engineers to build up computer programs helpful for the sake of it's easy going algorithm. In this thesis, in addition to the brief introduction of "Matter element analysis and the Extension set", we also perform several examples using the computer program developed under the theoretical approaches of "Matter element analysis" and compare the results provided by Fuzzy and Grey theory to show the advantages.