Research On Modeling Of Connected Relationships Based On Perceptual Parallel Discrete Event Simulation

Component-based modeling of Parallel Discrete Event Simulation (PDES) is becoming an important trend for the development of large-scale complex systems modeling and simulation. As an important part of the component modeling, the efficiency of Components Connection modeling affects the efficiency of the overall development of the simulation model. Components are mostly connected port to port directly by exiting modeling tools. However, there is often a conditional connection exiting between the components, which will change as the system state changes. To support the conditional connection, port to port connecting pattern needs to introduce additional adapter components, resulting in low modeling efficiency and flexibility. In order to improve the development efficiency of the component model, the components connection modeling techniques become an important issue to be solved in PDES component-based modeling development.Considering the demand for development of PDES component modeling, on the basis of analysis of the characteristics of the modeling techniques and the sensing mechanism of the components connection, the paper makes a deep study on key technologies of sensing-based PDES components connection modeling. The major work and innovations include:1. Existing PDES component modeling tools mostly directly connects components port to port. When there is a need for supporting the conditional connection between components, additional adapter components have to be used, resulting in low modeling efficiency and poor flexibility. For this problem, the paper presented the sensing mechanism-based components connection method, by which the state variable shared space named sensing-environment is introduced. And then it used the dynamic matching of sensing and influencing domain of DDM service to implement dynamic component connection. This eliminates the need to introduce the adapter components, and effectively improves the efficiency and flexibility of modeling.2. Most of the existing graphical component modeling tools uses the direct connection to connect components. This causes the building system model illegible by employing excess links and adapter components. To simplify the existing connecting pattern, the paper presents the graphical components connection modeling method to provide users with intuitive sensing-environment and filter graph cell and their corresponding configuration interface. The paper also defined the description file format of the sensing-based platform-independent model of components. All these make the component developers model the component connection more convenient and efficient.3. According to the characteristics of PDES component connection model, a template-based automatic code generation method is proposed for component connection. Based on the sensing-environment and the filter code templates created in advance, this method translates the user configuration information into corresponding code. In this way, sensing-based component connection graph model can be implemented by real code.Based on the above research, the Sensing-based Connection Modeling Framework has been designed and implemented for PDES components. Tests show that the modeling framework enables component developers to accurately and efficiently build components, by providing a graphical interface which is easy to model the connection, and generating code automatically based on the graph model built. The modeling framework meets the demands of PDES components connection modeling very well.