tailieunhanh - Petri nets applications Part 17

Tham khảo tài liệu 'petri nets applications part 17', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Using Petri Nets in the analysis of sequential automata models with direct applications on the transport systems with accumulation areas 631 Transition Connected arcs Associated events t1 Pi ti ti P2 a 12 Pi t2 t2 P4 d 13 p2 t3 t3 p3 b 14 P2 t4 t4 P4 c 15 p3 t5 t5 p1 a t6 P4 t6 t6 Po e Step 6. The determination of initial marking Mo The initial state is 0 Sq results the initial marking Mq 1 0 0 0 The graphical representation of the equivalent Petri Net obtained after the application of the conversion algorithm is presented in figure 2. Fig. 2. The equivalent Petri Net 3. The principles of realization and functioning of the transport systems with accumulation areas The industrial transport systems are of different types depending on the effective mode in which is realized the transport. In this way exists horizontal transport systems or suspended transport systems. Each type of system has its own constructive and functional features both of them belonging to the TSAA field. In figure 3 is presented a general view of TSAA. 632 Petri Nets Applications Suspended conveyor Fig. 4. Suspended transport system Within the chapter it will be taken into consideration only the suspended transport systems but the obtained results can be applied also to the horizontal transport systems. Constructive these are based of the using of brush conveyors as a transport support and have as a main property the assurance of accumulation areas jams of the transported elements without being necessary the stopping of conveyor moving motors. The conveyor is moved by an electric motor connected through a mechanical reducer situated at one of the conveyor extremities. This motor assures the moving of the conveyor with constant speed. The transport element used in the case of these transport systems is the trolley. Each trolley is identified in the system by a unique code bar. This code is used for the determination of the point in which is situated the trolley and for the computing of the route .