Carbon-flow Dynamic Modeling And Its Application Based On First-order Hybrid Petri Nets

In the background of the global climate change has gained international attentionand in the environment that China has decided to develop low-carbon economy andcarry out energy saving and emission reduction, as well as in view of the problems ofhigh-energy-consumption and high-pollution in China’s manufacturing industry, a newmanufacturing model, low-carbon manufacturing that promotes manufacturingenterprise with sustainable development emerges at the right moment. However,because of the characteristics of multi-source coupling, dynamics and complexity in themanufacturing system, analyzing the dynamics of carbon-flow, grasping the substantivecharacteristics of the system, maximizing the efficiency of resources and energy andminimizing the production process emissions, all of which will produce greatsignificance for enterprises to implement low-carbon manufacturing.With support from Natural Science Foundation of China and Chongqing scienceand technology of natural science fund, the dynamics of carbon-flow of manufacturingsystem are studied.Firstly, based on the characteristics of mechanical manufacturing system, thedynamics energy-flow and material-flow are analyzed. And through this analysis, thecarbon-flow system boundary of manufacturing system is derived. Based on the systemboundary, material and energy balance equations and carbon emissions calculationmodel can be given. Specially, the given conclusions can lay theoretical foundation forthe following established models.Secondly, with respect to the continuity of energy and the impact of discrete stateon the continuous process, combining with the the basic principle of first-order hybridpetri nets, the dynamic models of carbon-flow are established. In the established models,the formal definition, the rules description, the conflict resolution strategies, the model’sdynamics, as well as the modeling modules are analyzed, respectively. In the mean time,related elements of controllable arcs and inhibitor arcs are introduced in order toenhance the modeling semantics.Thirdly, the established dynamic models of carbon-flow are analyzed based on thefollowing aspects of objective functions, constraints, model optimization strategies.Then based on Matlab platform and the linear time-varying discrete-time state variablemodel, the optimization algorithm of the dynamic model is given. Finally, the produced gear shaft of a flexible automatic production line byChongqing Machine Tool (Group) co., ltd is chosen as example to model the productionline and analyzing the objective function and constraint conditions of the establishedmodels. Then combined with the associated simulation software, quantitative analysisfor the carbon-flowdynamics of the production line, in order to verify the feasibility ofthe proposed method.