基于Petri网隧洞施工过程的系统建模

将隧洞施工过程系统分解为相互关联的子对象系统，分别用Petri网对子对象系统建立分级子模型，将子模型作为主网络模型变迁元素嵌入，建立整个系统的Petri网模型。实例计算与分析表明，运用Petri网对隧洞施工过程进行系统建模是可地的，通过系统的分级大大简化了系统仿真模型，提高了计算交率，降低了计算难度。

Simulation Model of Tunnel Construction Process Based on Petri Nets

Tunnel construction is a typical discrete event dynamic system (DEDS). The interactions between events are so complex that it is difficult to figure out with a mathematical model. This paper introduces that a tunnel construction process is broken down into a series of relative sub object systems, and for each sub object system is given a hierarchical submodel. They are joined in the Petri net model of the whole system as a transition. Then, a simulation model of the tunnel construction process system is established by the means of the hierarchical and modular models of Petri nets. A case study shows that the simulation model based on Petri nets is feasible in the tunnel construction process. The hierarchical submodels simplify system simulation model, improve calculation efficiency and reduce calculation complexity.