Research On The Loading And Unloading Schedule Optimization And Control Problem Of AS/RS Based On The Petri Net

As the key part of modern logidtics system, AS/RS(Automated Storage and Retrieval System) is widely applied to every walk of life. Scheduling in or out warehouse is an important part in AS/RS. The scheme of scheduling in or out warehouse has very important influence to the operating efficiency of AS/RS. So the study of scheduling in or out warehouse in AS/RS has important theory and engineer significances. The emphasis of this paper is researching loading and unloading scheduling optimization of AS/RS and its control problem.In this paper, several works have been done as followed:In order to establish the model of loading and unloading warehouse that including information place, an object oritented timed petri net(OOTPN) modeling method was intrduced, and the speciality of petri net was analyzed. In this foundation, the deadlock analysis problem of the process was discussed, and the control strategy for deadlock avoidance was given.Classifying the scheduling rule of loading and unloading warehouse, then each chromosome representing a rule set was formed by combining several integer segments, genetics operations involving choice, crossing and variation were performed and they acted according to certain order, thus an optimized rule set was obtained. Illuminating the feasibility of the Genetic Algorithm apply in loading and unloading scheduling optimization of AS/RS.According to the established OOTPN model, using the VC++ 6.0 as the programming tools, combining barcode, database and multi-thread technology, the simulation program is coded and realizes the loading and unloading scheduling flow of AS/RS. Illuminating the feasibility of the petri net apply to the modeling of scheduling in or out warehouse.Combining the AS/RS of modern manufacturing and logistics laboratory, using the VC++ 6.0 as the programming tools, introducing database, barcode and profibus technology, the AS/RS loading and unloading system managing software was coded and the experiment was done. The result indicates that the AS/RS loading and unloading system managing software can run nicely.