Real-time Monitoring Of Carbon Emission And Multi-objective Optimization In Prefabricated Building Construction Cite Based On CPS

In recent years,with the continuous development of the global economy,the problem of global warming has been increasingly aggravated due to the increasingly prominent impact of fossil energy use on the environment.Under the background of energy conservation and emission reduction,China is under great pressure to reduce emissions.As one of the pillar industries of China’s economy,the construction industry has been a high-energy and low-efficiency industry for a long time,which not only consumes a lot of energy,but also aggravates the greenhouse effect due to the carbon emissions generated by the construction industry.Therefore,it is imperative to control and optimize the carbon emissions of the construction industry.At present,there are many researches on energy conservation and emission reduction in the construction industry,but relatively few studies on energy conservation and emission reduction in the construction stage.As the carbon emissions from the construction site are concentrated and sudden,it is necessary to monitor and optimize the carbon emissions from the construction site.In view of this,this paper uses Cyber-Physical System(CPS)technology to conduct real-time monitoring of carbon emissions in prefabricated building construction site,and uses ant colony algorithm to conduct multi-objective optimization based on "time,cost and carbon emission".First of all,this paper generalizes the carbon research boundaries on the construction site,then,based on the CPS technology with the organic integration of wireless sensors,communications network,cloud servers and mobile devices,this paper developed a real-time monitoring system for carbon emissions on the construction site,which can monitor and visualize the carbon emission generated by the main machinery in the construction site in real time.At the same time,this paper takes the installation process of prefabricated staircases of prefabricated buildings as an example,and analyzes the resource consumption of each process under different construction modes.Combining with the theory of multi-objective optimization,this paper transforms the multi-objective optimization problem of "time,cost and carbon emission" into a traveling salesman problem,and designs the flow of ant colony algorithm to seek the optimal solution.Finally,the CPS real-time monitoring system developed in this paper is applied to the actual assembly engineering construction site to verify the stability and practicability of the system.In addition,combined with the monitoring system and the field investigation,this paper obtained the process related data,and realized the ant colony algorithm by Matlab programming,thus obtained the optimal solution of the multi-objective optimization problem,and analyzed the feasibility and convergence of the algorithm.In this paper,the real-time monitoring research of carbon emission in construction site is a useful supplement to the research of carbon emission in construction industry.The real-time monitoring system based on CPS provides a new means for carbon emission monitoring and management of prefabricated construction sites,which is helpful to guide the development of green construction,and also provides a certain foundation for the future development of big data and smart construction sites in the construction industry.At the same time,the multi-objective optimization results of the process mode based on "time,cost and carbon emission" can effectively guide the construction organization,and realize the energy conservation and emission reduction of the construction industry.