The Project ZR2018MF024 Supported by Shandong Provincial Natural Science Foundation of China；the Scientific Research Foundation of Nantong University (135420612045 )
如果柔性制造系统包含不可靠资源, 在对系统进行控制器设计时, 不仅要考虑由于资源分配不合理带来的死锁现象, 还要考虑不可靠资源发生损坏带来的堵塞现象. 本文利用Petri网对具有不可靠资源的柔性制造系统进行建模, 结合Petri网图形结构: 资源变迁回路, 模拟系统中死锁和堵塞现象. 然后利用有效变迁覆盖的概念, 为系统设计一种结构简单、鲁棒性强的Petri网控制器. 最后, 利用两个例子来解释和验证控制器的有效性.
For flexible manufacturing systems (FMSs) with multiple unreliable resources, both deadlocks due to unreasonable resource allocations and blockings caused by the failure of unreliable resources are considered when designing controllers. In our work, Petri nets are utilized to model the above systems, and resource transition circuits, a kind of graphical structures of Petri nets, are used to characterize deadlocks and blockings of the systems. Then based on the concept of effective transition covers, a novel robust controller is synthesized with small sizes and strong robustness. Finally, two examples are proposed to illustrate the effectiveness of the robust controller.