Reasoning for CPS Education Using Surrogate Simulation Models

Abstract

With developing an affordable, easily accessible and scalable online CPS laboratory to promote CPS education system, we are faced with and focused on a number of cyber-physical challenges including the model design and simulation strategies. The authors provide a complete process to simulate a behavior of a user-design CPS conveyor system. The user-design model is sent to the background, treated offline, and extracted the simulation result and finally feedback to user as an animation. The solution approach has two main parts, as the aspect of the modeling work, complex domain-specific conveyor design are defined in the Generic Modeling Environment (GME), it can be mapped and transformed to the global grid, another domain-specific model, which contains only one kind of node with huge dimension so that all different species of components in complex model are mapped to the typical nodes in grid, and it is easy to operate and simulate the nodes in global grid to fit for the need when multiple experiments being mapped to the grid. In this work, we only concerned the scenario of one experiment. The transformation and mapping process is implemented through Graph Rewriting and Transformation. As a background simulation, the Robocodes code is automatically generated by GME interpreter from global grid and is applied to generate the path logic to transmit the package, according to the package type in each input ports. After acquiring the transmit speed and path, Robocode simulation outputs the coordinate and time information to generate the Java animation. The final Java animation will be feedback to the user side to see the result of package transmission flow.