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The aim is to extend current diagnosis, verification, and supervisory control approaches for modular discrete-event systems to networked discrete-event systems to cope with delays and losses in communications channels. Communications between supervisors and the plant are usually assumed to be reliable and instantaneous. In networked control systems, the feedback loops are closed via a real-time communication network, which is shared with other nodes inside or outside the control system. The communication carried out over a shared network then induces delays and losses. We investigate modular synthesis of supervisors that is robust to delays and losses. We further apply the investigated approaches to the verification and control of guidepath-based transport systems that find applications in material handling systems, robotics and many other fields.  +