Petri net Approach of Collision Prevention Supervisor design in Port transport system (CROSBI ID 139633)
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Podaci o odgovornosti
Kezić, Danko ; Vujović, Igor ; Gudelj Anita
engleski
Petri net Approach of Collision Prevention Supervisor design in Port transport system
Modern port terminals are equipped with various local transport systems, which have the main task to transport cargo between local storehouses and transport resources (ships, trains, trucks) in the fastest and most efficient way, and at the lowest possible cost. These local transport systems consist of fully automated transport units (AGV – automatic guided vehicle) which are controlled by the computer system. The port computer system controls the fully automated transport units in the way to avoid possible deadlocks and collisions between them. However, beside the fully automated local transport units, there are human operated transport units (fork-lift trucks, cranes etc.) which cross the path of the AGV from time to time. The collision of human operated transport unit and AGV is possible due to human inattention. To solve this problem, it is necessary to design a supervisory control system that coordinates and controls both human driven transport unit and AGV. In other words, the human-machine interactions need to be supervised. The supervising system can be realized in the way that the port terminal is divided into zones. Vehicles’ moving is supervised by a video system which detects the moving of particular vehicles as a discrete event. Based on detected events, dangerous moving of certain vehicles is blocked by the supervising system. The paper considers the design of collision prevention supervisor by using discrete event dynamic theory. The port terminal is modeled by using ordinary Petri nets. The design of collision prevention supervisor is done by using the P- invariant method. The verification of the supervisor is done by computer simulation.
Petri nets ; AGV ; collision prevention supervisor ; human-machine interaction
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Podaci o izdanju
Povezanost rada
Tehnologija prometa i transport, Temeljne tehničke znanosti