During the product development, ordinary companies will provide several design plans and choose the optimized one. Thus, many companies have realized that the designing defect existed in the prophase would lead to a lot of trouble in manufacturing and using later. We need do some designing evaluations for some aspects of products at the designing phases in order to avoid those problems. However, we should spend so much time in calculating some performance indexes and appraising process in the product design. At the same time, we know that some performance indexes cannot be counted precisely before the final design and sometimes we do not need to know their accurate value. In the model of qualitative mathematics appraising, we usually utilize fuzzy evaluation as the guideline to analyse some characteristics and integrate expert knowledge into create the product model of appraising. The signification is as follows: we can consider many factors’ effect in a fuzzy environment and appraise the product performance synthetically according to the effect extent of all factors. It will help the corporation satisfy the customer’s needs in the development of new product more conveniently and economically. is one of the key technologies in advanced manufacturing field, and be an important technology during the implement of concurrent design. concludes DEA-Design For Assembly, DFM-Design For Manufacturing, DFC- Design For Cost, DFS-Design For Service, DFQ-Design For Quality and so on. At the product design stage, we can use DFX tools to make the product with better manufacturability, assembility, maintenance and regeneration. It will largely avoid repeating the design and minimum the designing time and manufacturing time.This thesis discussed the selection of appraising index about DEA, DFM, DFS, and DFC in DFX.. Then we created the evaluating and empoldered the about DFX using fuzzy evaluation arithmetic, SQL Sever 2000 database, ASP development tool. It can help designers using IE browser to evaluate the product design plan.The whole system accomplishes the synthetical evaluation of DFX for designing plan and it was proved correct from experiment validation. It provides a new way to evaluate a design plan.
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