Research On Key Technologies Of Material Flow Auto-scheduling System Based On RFID In Storage Yard

With development of logistics technology and deposit &transport industry, enterprises pay more attention to the efficiency of material flow. Storage yard, a very important chain of material flow, now is supervised manually or in the state of semi-automation. Its efficiency isn't high. It is imperative to all enterprises to improve the efficiency of material flow. So the thesis puts forward an autoscheduling system model which aims to accomplish the automatic, intelligent and informational supervision of storage yard.For the sake of research, the thesis summarizes the development and present situation of the technology such as automatic identification, AGVS, system integration and MIS at home and abroad, and introduces research contents.The thesis puts forward an integrated system by the analysis of need that is made up of computer controlling units, RFID units, AGVS and PCGC units, 晈here computer controlling is the kernel, RFID is used to collect data , AGVS and PCGC are acted as implementing units. After discussing the structures and integration ways, it also describes the function of the system.As narrated above, RFID is in charge of data collection. Some codes of base band correlation with Tag are discussed and more attention is paid to CRC and Hamming code. During Tag's coding, CRC and Hamming code have also been used.Storage yard MIS is one of the emphasizes for research. Based on the analysis of need, the thesis builds data models of MIS after notion design, logical structure design and deposit structure design. All kinds of function of MIS can be implemented with suitable database accessing technology.On the basis of characteristic analysis of NN, AI and graphics for path plan, the thesis offers a graphics model and changes it into a Petri net model in the light of some rules. Taking the shortest path, turning times and path overlapping into account, the most excellent path can be got through a kind of modified arithmetic.Interface links users to application software. The thesis introduces some primary interfaces in the software and their operation. Later an example is offered to implemented management of goods deposition.Based on the summaries and conclusions of all research works, some suggestions and prospect for further researches are put forward.