基于多目標(biāo)的虛擬制造單元運(yùn)行優(yōu)化方法研究
[Abstract]:In order to satisfy the rapid change of consumer orders and the dynamic adjustment of market environment, the manufacturing industry must change the traditional large-scale production mode. The multi-variety and small-batch production mode has become the leading mode of manufacturing in the information age. It is also one of the important production organization and management models in the 4.0 era of industry. In the process of implementing the "made in China 2025" strategy, the manufacturing foundation has been continuously strengthened, and the multi-variety and small-batch production model has become an important part of the intelligent manufacturing development action plan. Virtual manufacturing unit (Virtual manufacturing cell,VMC) is a new workshop manufacturing model to realize multi-variety and small-batch production mode, and it is also the technical support to realize digital, networked and intelligent manufacturing. This thesis focuses on the resource optimization, production scheduling and multi-objective virtual manufacturing cell optimization scheme decision. The main research contents are as follows: 1. In the multi-variety and small-batch production mode, the customer's objective personality is distinct. Different enterprises or internal departments of enterprises often present conflicting goals and demands; The production environment is complex and changeable, and the inevitable uncertainty disturbance inside and outside the production manufacturing system leads to the dynamic characteristics of the production process. The task decomposition based on workshop dynamic reconfiguration and the generation of virtual manufacturing cell are introduced to achieve the dynamic combination of equipment resources. With the application of group technology, multi-variety and small-batch production is converted into batch production, which improves the utilization rate of manufacturing resources and reduces production cost. 2. Based on the analysis of virtual manufacturing cell construction technology, heuristic algorithm and Pareto dominant technology, etc. An improved free search algorithm based on Pareto is proposed to solve the multi-objective virtual manufacturing cell resource optimization problem. The convergence of the proposed algorithm is proved, and the convergence speed and complexity of the algorithm are analyzed. Unit production scheduling is an important step of virtual manufacturing unit (VMU) operation. It is an important process of scheduling and machine allocation for autonomous decision making within a unit. The dominant technology of Pareto is introduced to improve the population maintenance strategy. An improved genetic algorithm is proposed to solve unit production scheduling. In view of the uncertainty disturbance of virtual manufacturing cell, a kind of rescheduling strategy with processing time of interval number is studied by using rolling window and pan-grey number technology. In order to realize the overall optimization of virtual manufacturing cells, a two-layer joint decision model based on Pareto dominating solution set is proposed to realize the overall optimization of virtual manufacturing cells by optimizing the resources of virtual manufacturing cells and production scheduling. Based on the principle of the combination of step decision and information feedback, decision makers' information preference mechanism and multi-attribute decision making method are used to realize the optimal decision of the whole scheme of virtual manufacturing cell operation.
【學(xué)位授予單位】:合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:F424;F273
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