Overview in PDF format - Tallinna Tehnikaülikool

Turning and milling operations can be performed either by using conventional,CNC or automated machine tools. In case of need the available resources can beordered from networked resource-sharing enterprises.For solving planning tasks of the wormshafts manufacturing the workflowdiagram is represented by the automaton “Manufacturing process” and thetechnological resources needed for that by automata “Milling_m 1 ” …“Milling_m n ”, …, “Lathe 1 ”, …, “Lathe n ” grouped by their locations (Fig. 3.10).When running the Uppaal model checker with constraint specification“EManufacturing_process.Sf” with the option “diagnostic trace – fastest”, itmeans that a path from the global initial state to the global final state that includesManufacturing_process.Sf is searched and that the path has the shortest duration.The diagnostic trace generated by optimal solution provides us also with thelocations where performing the machining operations gives the shortest cycle time.Location 1Location n……Figure 3.10 The M 0 model for solving wormshafts production planning tasks3.5. Conclusions of Chapter 31. Generally, the efficiency of MC depends heavily on the used model andcorrectness condition to be checked. The MC strategies such as over/underapproximations, breadth first/depth first search, state space reuse and reductionprovide substantial speedup if properly chosen. Current experience shows thatthe definition of model checking task templates for given application has to beaccompanied with strategy selecting rules that constitute a part of the expertrule base in R/OMS.2. A formal model checking technique was proposed as an extension to R/OMStools. Providing provably safe instructions for an operator is possible only whenhaving adequate process and operator behavioural models. Real time modelupdating in this approach is performed by measurement system and expert41