Modeling Method Of Spatiotemporal Characteristics Of CPS

The cyber-physical system is a multi-level,highly complex and integrated comprehensive system that integrates computing resources,physical environment and network control.It provides information network services and real-time monitoring for various engineering systems through the close integration of network communication,computing and control technologies.As a real-time system,CPS system has the characteristics of high safety,reliability and efficiency.The cyber-physical system must perceive the changes in the physical environment uninterruptedly and in real time through sensor perception,and then transmit the perceived information through the network.CPS has a wide range of application prospects.There are many application areas,including autonomous driving,smart factories,intelligent flight control and navigation of UAV,as well as intelligent services for industrial Internet and urban governance,and so on.This thesis will first discuss the various theories of CPS in detail in the introduction,so as to have a clear understanding and understanding of it.Then it will focus on analyzing the time-space characteristic model based on CPS,and propose to analyze and study CPS from the perspective of time and space.Then,the time logic and space logic of the model will be expressed in primitives,explaining the model,the reasoning logic of temporal topological relations and spatial transformation.On this basis,several popular models will be analyzed,including the time-space sequence snapshot model,the discrete grid cell list model,the space-time complex model,and the event-based time-space characteristic model.The analysis of these time-space characteristic models Applications in their respective fields and their advantages and disadvantages.Analyze the connotation of object-oriented thinking,abstract the physical entities in the model into objects for easy analysis and modeling,and analyze the process in the model from the two dimensions of object attributes and operations(behavior).On the basis of the above-mentioned theories,CPS,spatio-temporal characteristics,Petri nets and object-oriented are combined to form a new idea-Object-oriented Spatio-temporal Petri Net(OOSPN).In the object-oriented spatio-temporal Petri net,the analysis will be carried out one by one from the three cases of UAV swarm,vehicle dynamic analysis of V2 V technology,and process analysis and optimization of flexible manufacturing.In the process of analysis,attention should be paid to the object model diagram of Petri net and its reachable tree to clarify the definition of places,transitions and objects in OOSPN.Finally,summarize the advantages and disadvantages of the object-oriented spatio-temporal Petri net,verify the three models established by the object-oriented spatio-temporal Petri net,discuss their correctness and the effectiveness of the collaborative tracking strategy,and appear in the modeling process Problems and deficiencies.