| AS/RS(Automated Storage and Retrieval System) is a system which can store and getout goods automated without direct human intervention. And it’s also a system of the use ofmulti-storey shelves, forklift which can access to goods in the cargo space under the cargoarea of the roadway, computer control, information and communication. Task planning is akey point in the automated warehouse research. So, it’s very necessary to study the stabilityand the rationality of task planning of the system.Firstly, the hardware of the automatic logistics system in Subjects Experimental Centerof XUST is introduced and analysed in the thesis. Based on the understanding of each corepart’s structure and parameters, the Petri Net model is established to describe the taskplanning of automated warehouse, and the definition of each element is given.Secondly, aiming at the task planning of automated warehouse and the complicacy of thePetri Net model established, and based on the analysis and comparison of Petri Net andColored Petri Net (CPN), a method of CPN is proposed to model of the automated warehouse,and then the descriptive definition of CPN model is given combining with the actual system.The two operations (Inhouse and Outhouse) and the three operations (Inhouse Outhouse andMovehouse) of the system are simulated in the CPN Tools environment in the paper. Theanalysis of state space of the system model verifies the universal of CPN applied in LogisticsSystem, and the system has the properties of boundedness and liveness and no deadlock,which demonstrates the rationality of task planning of the system further, and establishes thefoundation of the stability and the coordinated operation of multi-tasking of the wholesystem.□Finally, based on the stability and the rationality of task planning of the system and theavailable resources, the transline control system of automatic logistics system is expanded and developed through the database and operation interface designed. After many practical testing,it is proved that the most part of transline developed(Outtable Pipeline Director andRoller)can work well. |
