Fig. 1. The model of offset printingpressurecontrol system Fig. 2. Model of roll printingpressurecontrol systemusing the pneumatic system offset roller linder Inkrolle processing with slow speed and relatively large thickness and not consider the effect of web tension during operation.In this paper, the printing pressure control algorithm will be addressed to control the gap with micro-level precision between two rollers, maintain the precise web pressure and thickness, avoid the slippage and fast respond with disturbances. Proposed pressure printing control algorithm development is based on eliminating the slippage and keeping gap at suitable distance. A mathematical model of roll printing pressure control system using the pneumatic system is proposed. By writing the system of dynamic equations in strict feedback form and applying the back-stepping theory, a full state feedback controller is obtained with gains determined optimally by genetic algorithm. The simulation results employed in Matlab/Simulink show the stability and high precision of the proposed algorithm II. MATHEMATICAL MODEL DEVELOPMENT Figure 1 shows the model of offset printing pressure control system that consists of two air cylinders, nip roll, offset roll, and ink roll. Cylinders with controlled valves are used to change pressure and move up and down nip roll to reference positions to make printing pressure at suitable level.
By applying pedigree into product conceptual structure design, an evolutionary conceptual design approach is set forth to make full use of creative and innovative intelligence of living systems for design automation. According to the evolutional logic of quantities to quality, the relationship between different conceptual structures is deduced and ordered,then is expressed as product pedigree. The classification description model of product pedigree is established, which can be used as unified functionally isomorphic model during the intelligent conceptual design process. On the other hand, according to the evolutional logic of quality to quantities, pedigree based product evolutionary design strategy are given. Based on the relation network among pedigree units, multiple variation designing schemes can be obtained, which is a strong backbone to the innovative design process. Finally, design examples are used to demonstrate the successful application of the proposed pedigree based evolutionary method in the multi-scheme conceptual design of product.
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