Tooling Time Quota Intelligent Decision Support Systems Research

Man-hour rationing is an important and basic work for the modern enterprise management. With the development of the technology, it is necessary to improve the quality and efficiency of the man-hour rationing by using computer aided technologies. On the basis of analyzing for the status and the defects of the domestic research and considering its characteristics such as heavy difficulty of man-hour rationing of tooling, two levels of man-hour rationing existing in the enterprise and workshops, and especially its great experience-dependence for the enterprise man-hour rationing, this thesis aimed at designing a computer aided system for man-hour rationing of tooling based on the intelligent decision support technology. The following are the main issues addressed by this thesis:1) The framework design of intelligent decision support system for man-hour ration of tooling. On the basis of the theory of decision supported system, expert system and intelligent reasoning, according to the characteristic of the man-hour rationing, this thesis designed a system framework which is adapted to both enterprise and workshop levels' man-hour rationing by putting forward three kinds of methods called respectively checking list, reasoning decision and modifying standard case.2) Design and implementation of the data source of the system. This thesis denoted the logic relation of tooling information and implemented the visualized tooling information management according to the assembly structure relationship. Through the model divided into two levels, included by two forms and devoted by three-level frame structure, the system completes feature information modeling adapting to decision-maker's decision and judgment style. Through tooling cases devoted by three-level frame structure which is same to feature models', expansibility of tooling case's type and information is implemented.3) Design and implementation of reasoning decision strategies. Reasoning decision strategies oriented to enterprise man-hour rationing level, is one of focus of this thesis. Aiming at the characteristic of the man-hour rationing in the enterprise wide that emphasizes forecasting and using of experience and knowledge, this thesis brought forward and adopts a hybrid reasoning model composed by CBR and KBR to make the system more intelligent and efficient. This is an innovation of this thesis. Fuzzy set-based retrieve algorithm is applied in the CBR, The discrete and fuzzy rules of the shape size-man-hour are fitted by a surface of double cubic B-spline in the KBR.4) Development and implement of the system. The system is generally completed and a good applying effect has been achieved in Chengdu Aircraft Manufacturing Corporation currently.