Academic Journal
Scheduling and discrete event control of flexible manufacturing systems based on Petri nets
| Τίτλος: | Scheduling and discrete event control of flexible manufacturing systems based on Petri nets |
|---|---|
| Συγγραφείς: | Xiong, Huanxin Henry |
| Πηγή: | Dissertations |
| Στοιχεία εκδότη: | Digital Commons @ NJIT |
| Έτος έκδοσης: | 1996 |
| Συλλογή: | Digital Commons @ New Jersey Institute of Technology (NJIT) |
| Θεματικοί όροι: | Flexible manufacturing systems, Petri nets--Industrial applications, Automatic control--Computer programs, Electrical and Electronics |
| Περιγραφή: | A flexible manufacturing system (FMS) is a computerized production system that can simultaneously manufacture multiple types of products using various resources such as robots and multi-purpose machines. The central problems associated with design of flexible manufacturing systems are related to process planning, scheduling, coordination control, and monitoring. Many methods exist for scheduling and control of flexible manufacturing systems, although very few methods have addressed the complexity of whole FMS operations. This thesis presents a Petri net based method for deadlock-free scheduling and discrete event control of flexible manufacturing systems. A significant advantage of Petri net based methods is their powerful modeling capability. Petri nets can explicitly and concisely model the concurrent and asynchronous activities, multi-layer resource sharing, routing flexibility, limited buffers and precedence constraints in FMSs. Petri nets can also provide an explicit way for considering deadlock situations in FMSs, and thus facilitate significantly the design of a deadlock-free scheduling and control system. The contributions of this work are multifold. First, it develops a methodology for discrete event controller synthesis for flexible manufacturing systems in a timed Petri net framework. The resulting Petri nets have the desired qualitative properties of liveness, boundedness (safeness), and reversibility, which imply freedom from deadlock, no capacity overflow, and cyclic behavior, respectively. This precludes the costly mathematical analysis for these properties and reduces on-line computation overhead to avoid deadlocks. The performance and sensitivity of resulting Petri nets, thus corresponding control systems, are evaluated. Second, it introduces a hybrid heuristic search algorithm based on Petri nets for deadlock-free scheduling of flexible manufacturing systems. The issues such as deadlock, routing flexibility, multiple lot size, limited buffer size and material handling (loading/unloading) are ... |
| Τύπος εγγράφου: | text |
| Περιγραφή αρχείου: | application/pdf |
| Γλώσσα: | unknown |
| Relation: | https://digitalcommons.njit.edu/dissertations/1026; https://digitalcommons.njit.edu/context/dissertations/article/2081/viewcontent/njit_etd1996_110.pdf |
| Διαθεσιμότητα: | https://digitalcommons.njit.edu/dissertations/1026 https://digitalcommons.njit.edu/context/dissertations/article/2081/viewcontent/njit_etd1996_110.pdf |
| Αριθμός Καταχώρησης: | edsbas.AEA50D57 |
| Βάση Δεδομένων: | BASE |
| Η περιγραφή δεν είναι διαθέσιμη |