The preform is covered by a flexible vacuum bag in vacuum-assisted resin infusion process, and the preform compaction state is time and space dependent during the mould-filling stage, there is no practical tool for the filling simulation. In this paper, the resin flow governing equations for vacuum-assisted resin infusion are built based on the analysis of the preform compaction behaviour and the fibre tow impregnation. For obtaining the numerical solution conveniently and accurately, an alternative approach is proposed in which the primary flow is computed from the normal Darcy's law, two-slave elements are added to each master element, named sink slave element and deformation slave element, to calculate the resin mass variation caused by fibre tow infiltration and preform deformation. Three examples are conducted to verify the precision and broad applicability of the approach. The influence of the preform deformation and the unsaturated effect on the mould filling is analysed.
In view of the miniaturization and decentralization characteristics of agricultural equipment factories in China, agricultural equipment manufacturing is well suited to the cloud manufacturing model, but there is no specific research on cloud services optimization for it. To fill the research gap, a cloud service optimization method is proposed in this paper. For the optimization model, the dynamic coefficient strategy and the reliability feedback update strategy are added to the mathematical model to strengthen the applicability of farming season. As optimization algorithm, a dynamic artificial ant-bee colony algorithm (DAABA) based on artificial ant colony algorithm and bee colony algorithm is presented. The optimal fusion evaluation strategy is used to save optimization time by reducing the useless iteration, and the iterative adjustment threshold strategy is adopted to improve the accuracy of cloud service by increasing the size of bee colony. Finally, the performance of DAABA is verified to be more superior by comparing with other algorithms.
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