The Research On Logistics System Modeling By Colored Petri Nets

The Logistics system modeling and analysis is the hot research field in the world. There are a lot of theories on logistics and supply chain. In this thesis the timed colored Petri nets is used to build logistics models. These models could be running on the computer, and they are covered from the logistics typical structure model, logic model, to the enterprise's internal model and supply chain model. These models are from low level to high level. The normal models in logistics management are included.The Petri nets model of "AND" , "OR", "XOR" and sequence, parallel, cycle, choice basic structure model are mentioned in this thesis. After that, the inventory control, warehouse operation and JIT system Petri nets model is also built. All the models are calculated by simulation, and the results are analyzed. The model's properties are also discussed.Synthesis these models, a supply chain model of Timed Colored Petri net is put forward. It is a hierarchy model. In this model, the item is expressed by colored variable. It can describe different kind items. So the Supply Chain model can be applicability to many cases.In This thesis the 2008 Beijing Olympic Games is studied. The Beijing Olympic Games Supply Chain Petri nets model is built. The feature of Olympic Games supply chain is that the inventory is controlled by the supply planning, at the same time, the reorder point inventory control must be considered. The thesis discussed the model on three aspects: the real demands, the purchase period and the supply lead time.Some research works are done in this thesis:1) The sequence, parallel, cycle, choice structure model and the logic model of "AND","OR", "XOR" are built sisterly. Former's workers are confirmed and improved.2) The Inventory control, warehouse operation models are constructed. The inventory control model is corroborated by using a company's data. On the simulation foundation, the relationship of safe inventory and the rate of out stock under the non-normal distribution demand, the evaluation index of warehouse operation are discussed in this thesis.3) JIT system colored Petri nets model is put forward. In the thesis, the relationship of order interval and supply frequency is analysis by simulation. It is found that when the order interval is greater than the supply frequency, the JIT system will appear supply immediately.4) The Supply Chain Colored Petri nets model is also built. The bull whip effect is confirmed by simulation. The average customer response speed can be used to evaluate the response speed of Supply Chain.5) The 2008 Beijing Olympic Games Supply Chain model is discussed at last. The model feature is the planning mixed with random demand. After simulation, get the conclusion that when the supply lead time is same as the purchase period, the inventory is lower, the response speed is faster, the Supply Chain is under best condition.This thesis includes 152 charts, 70 tables, and reference 162 papers.