| Along with the development of virtual reality, virtual experiment gets more and more deep research. The difficulty in realizing of the virtual experiment system is how to build a reasonable and efficient simulation model. Nowadays most virtual experiment system models still have lots of limitation in the aspect of the model and controller. Therefore, for building a more reasonable and efficient simulation model, the technique of Petri nets, object-oriented method and computer modeling theory are being combined, and an object-oriented virtual system simulation model is put forward.Through summarization and analysis of discrete-event system theory and object-oriented simulation technology, a framework of Object-Oriented Simulation Modeling, which separates model and controller, is put forward. By the framework, the model is described from three aspects: relation, behavior and communication, and is practically described by the model of virtual devices. Besides, the simulation algorithm of logic circuits will realize the controller.Virtual devices include atomic and coupled devices. The atomic device is the base unit of system, and the coupled device is composed of atomic or other coupled devices. A logic circuits model based on Controlled Colored Petri Nets(CCPN) is proposed in this paper. Based on the firing rules, which fully consider the particularity and stability of logic circuits, the model introduces gate function sets and effectual hypotheses to the colored Petri nets. And it effectively solves the problem that the topological structure of logic circuits is difficult to describe in the simulation.The structure in which the model and controller separates makes modeling efficient and correct, also improves the independence and reusability of virtual devices. So the model warehouse is improved succinctly and continuously developed. Therefore, it has accessional value for the field interrelated with simulation research of virtual experiment. |
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