Based On The Internet Mechanical Optimization And Evaluation Of Decision-making Method And System Development

This thesis is supported financially by a key project of the National Science Foundation of China, (Grant No. 50465001) and a key project of the science and technology office of Shandong province, (Grant No.2004GG1104017).By referring and summarizing the latest national and international achievements, the combination optimization of mechanical optimization and the mechanical scheme appraise decision method based on the Vague Set and Grey Theory are researched. Mechanical design scheme optimization and appraisal decision-making system based on Internet are developed.Combinational optimization problems are always the difficulty in mechanical optimal design. Ant Colony System is a new type method, which is proposed recently to solve some combinational optimization problems. By using Enhanced Ant Colony System, mechanical design scheme intelligence optimization system based on Internet is developed. Scheme combinational optimization problems are solved effectively by using this system.The projects are manifold sometimes in engineering. Each scheme has its advantage and disadvantage. So it is difficult to compare the excellence with the inferior for mechanical kinematics scheme and it is necessary to evaluate and make decision. Firstly, the concepts of vague sets and vague values are introduced. Then some existing similarity measures are reviewed and compared. It is pointed out that those methods are not always suitable for some cases, and the reasons are analyzed as well. Base on them the similarity measures between vague values and between weighted elements are improved. And it is applied on Mechanical scheme design. In view of the shortcomings of traditional fuzzy unified evaluating method, this thesis proposes a Decision-making Method of the Design Scheme of the Mechanical Based on Vague Set and interval gray number. The multi-attribute fuzzy decision, by introducing gray system theory into the scheme, forms a fuzzy decision-making model based on gray relational analysis. An Example showed the effectiveness of the method.In view of the shortcomings of traditional comprehensive evaluation decision system, this paper gives the structural framework of Optimization Design of Machinery and comprehensive evaluation decision system based on the Internet, expounds the functions of all components in this system and their mutual relationships, and introduces in detail the concrete procedures of implementing this system. This system is mainly consisted of optimization module, evaluation and decision-making module, optimization design module and so on. All of the operations logic and affairs logic are completed by each layer servers, which greatly improves the security, stability, maintainability and expansibility of the system; and also reduces the load of network, enhances the mutual ability with users. It can work just with Web browser in client terminal. The system cannot only improve the opening and intelligence of the comprehensive evaluation, but also could make mechanical optimization design &comprehensive evaluation agile and effective in practical use. It is demonstrated that the test is practicable and effective by the analysis of an example.