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In order to enhance the fixture board design efficiency and support fixture board original design, a framework method based on functional features was proposed. In this method, Functional Requirements (FRs) for the fixture board structures were analyzed. Through incorporating FR and Design Knowledge (DK) into the fixture board's Structure Features (SFs), the Functional Features (FFs) of fixture board...
The design of assembly tolerance is directly related to the product quality and product manufacturing cost. In order to carry out a reasonable distribution of the assembly tolerance, this paper considers synthetically the product quality loss and product processing cost. The fuzzy weight of the quality loss and product processing cost is calculated based on fuzzy number. Meanwhile, the weight of experts...
Sheet metal has been widely applied in the manufacturing industry, such as automobile and aircraft and so on. However, sheet metal is thin walled structure in general, and deformation of this structure occurred easily. This deformation causes product out of tolerance, and influence assembly efficiency and assembly quality. So the joining process of sheet metal was summarized as LCJR cycling. The assembly...
Based on critical chain theory, a new method for aircraft development project was proposed on assembly task scheduling, which can effectively improve flexibility of assembly scheduling scheme. In the method, the priority rules for critical chain identification was established by the three characteristic parameters, and then the algorithm steps which identifies critical chain was listed by project...
The expert judgment risks respond method used now in aircraft assembly project need to be improved for its subjectivity and complication. To make it more effective and reliable, we proposed an improved method that integrated neural network with framework reasoning. Firstly, basing on frame theory, we stored experts' experiences about risk response in the expert system repository by the rule that there...
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