With a water-supply network by dynamic programming. The minimal as an example, the network was optimized annual discounted costs were taken as an objective function and node pressure etc. as constraint conditions. The...With a water-supply network by dynamic programming. The minimal as an example, the network was optimized annual discounted costs were taken as an objective function and node pressure etc. as constraint conditions. The alternative pipe diameters were optimized as per enumeration method and the group allowing objective function with the least values would be the optimized one. It is proved the optimized pipe network reduced by 11.49% in terms of cost and the optimized ben- efits proved much significant.展开更多
A new geometric modeling approach is introduced in this paper.First the principle of modeling of 3D pipe network is discussed in detail.Then the procedures of implementing pipe network visualization and system functio...A new geometric modeling approach is introduced in this paper.First the principle of modeling of 3D pipe network is discussed in detail.Then the procedures of implementing pipe network visualization and system functions are presented.Last,several efficient methods for speeding up display of graphics are introduced.The new geometric modeling approach offers to people a new way to solve 3D visualization of complex urban pipe network.展开更多
This paper analyzes the pipe network system of oil-gas collection and transportation for offshore oilfield development. A '0-1' integer linear programming model is constructed to optimize the investment of sea...This paper analyzes the pipe network system of oil-gas collection and transportation for offshore oilfield development. A '0-1' integer linear programming model is constructed to optimize the investment of seabed pipe network. The mathematical model is solved by the spanning tree method of graph theory and network analysis. All spanning trees of a network graph compose all the feasible solutions of the mathematical model. The optimal solution of the model is the spanning tree with the minimum cost among all spanning trees. This method can be used to optimize the seabed pipe network system and give a minimum cost plan for the development of offshore marginal oilfield groups.展开更多
In this paper the dynamic characteristics in pipes are analyzed with frequency method, and puts forward a simple and practical describing method. By establishing the model library beforehand, the modeling of the pipe ...In this paper the dynamic characteristics in pipes are analyzed with frequency method, and puts forward a simple and practical describing method. By establishing the model library beforehand, the modeling of the pipe net is completed automatically, and we can accurately calculate the impedance characteristics of the pipe network, achieve the reasonable configuration of the pipe network, so that to decrease the pressure pulsation.展开更多
The sustainable development of Chinas social economy, the heating pipe network project has also had a great development. At present, the society gives positive encouragement and advocacy to the sustainable development...The sustainable development of Chinas social economy, the heating pipe network project has also had a great development. At present, the society gives positive encouragement and advocacy to the sustainable development of the project, and takes energy conservation and emission reduction as a very important task at present. Environmental protection has also become the primary factor of project construction. Central heating has been gradually adopted by construction workers in the heat network, mainly because central heating can greatly reduce the cost of the project. But if there is a problem in a node in the heat network, it will lead to a large area of the heat network without heating phenomenon. Therefore, due to the complex pipe network, the quality danger of heating pipe network is easy to occur in the construction process. Strengthening the construction technology is an important basis to ensure the quality.展开更多
With the acceleration of urbanization,the demand for water supply and drainage pipe networks has increased significantly.In the planning of urban construction,it is necessary to optimize the design of the water supply...With the acceleration of urbanization,the demand for water supply and drainage pipe networks has increased significantly.In the planning of urban construction,it is necessary to optimize the design of the water supply and drainage system pipe network to effectively save energy while providing residents with more accessible water resources.Therefore,the municipal water supply and drainage system and the water transmission methods should be designed according to the geographical conditions of the city.In this paper,we mainly analyze the design of municipal water supply and drainage systems and the selection of water transmission methods.Besides,the optimization of the water supply and drainage network zoning process and pipe network maintenance is also discussed,so as to provide a reference for municipal water supply and drainage work.展开更多
Since the reform and opening up, China's economic level has gradually improved, and people’s demand for a better life has become increasingly strong. With the rapid development of urbanization, large-scale popula...Since the reform and opening up, China's economic level has gradually improved, and people’s demand for a better life has become increasingly strong. With the rapid development of urbanization, large-scale population and construction facilities gather in the city. Heat energy is an essential energy in people’s life. Central heating engineering has become an essential infrastructure in urban construction. At the same time, heating engineering also implements the strategy of human sustainable development, which is important for improving people’s living standards, protecting the environment and improving the environment. The present situation of gas reservoir plays an important role. The construction of heat pipe network in the city is relatively strict. In order to avoid that the heat pipe network project will affect the interests of residents, public safety and the stability of the whole system due to quality problems, the relevant parties of the project should conduct real-time supervision and inspection according to relevant standards during the construction of facilities. The design documents should be implemented to ensure the scientificity, safety and stability of the project. And improve the efficiency of its system operation, to achieve the purpose of economic operation. This paper makes a detailed analysis and discussion on the importance of the safety construction of the heat pipe network project and the supervision in the construction process, so as to lay a theoretical foundation for the smooth progress of the project.展开更多
At present, in the municipal drainage pipe network project, the level of the construction quality of the project whether to play an important correlation. Municipal drainage pipe network engineering in the actual cons...At present, in the municipal drainage pipe network project, the level of the construction quality of the project whether to play an important correlation. Municipal drainage pipe network engineering in the actual construction, should be closely around the quality control of scientific and reasonable control, take targeted means to increase the quality control, understand the main factors affecting the quality of engineering, develop a scientific and reasonable construction means, to promote the project can play a due value. This paper explores the quality control of such projects.展开更多
An efficient numerical method with first and second order accuracy is developed by the flux split technology to simulate the water hammer problem in single and multiple pipe networks under severe transient conditions....An efficient numerical method with first and second order accuracy is developed by the flux split technology to simulate the water hammer problem in single and multiple pipe networks under severe transient conditions. The finite volume formulation ensures that both schemes conserve mass and momentum and produces physically realizable shock fronts. The conception of the fictitious cell at the junction is developed. The typical water hammer problem and the experi ment with friction and the comprehensive orbicular network with control valve and pressure relief valve and surge tank are implemented to test the numerical method. Strong numerical evidences show that the proposed scheme has several desirable properties, such as, accurate, efficient, robust, high shock resolution, conservative and stable for Courant number.展开更多
Water shortage is one of the major water related problems for many cities in the world.The planning for utilization of reclaimed water has been or would be drafted in these cities.For using the reclaimed water soundly...Water shortage is one of the major water related problems for many cities in the world.The planning for utilization of reclaimed water has been or would be drafted in these cities.For using the reclaimed water soundly,Beijing planned to build a large scale reclaimed water pipe networks with multi-sources.In order to support the plan,the integrated hydraulic model of planning pipe network was developed based on EPANET supported by geographic information system(GIS).The complicated pipe network was divided into four weak conjunction subzones according to the distribution of reclaimed water plants and the elevation.It could provide a better solution for the problem of overhigh pressure in several regions of the network.Through the scenarios analy-sis in different subzones,some of the initial diameter of pipes in the network was adjusted.At last the pipe network planning scheme of reclaimed water was proposed.The proposed planning scheme could reach the balances between reclaimed water requirements and reclaimed water supplies,and provided a scientific basis for the reclaimed water utilization in Beijing.Now the scheme had been adopted by Beijing municipal government.展开更多
Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper pr...Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper presents a straightforward and efficient approach to an urban distributed runoff model(UDRM).The model is developed to quantify the discharge and water depth within urban drainage pipe networks under varying rainfall intensities and land-use scenarios.The Nash efficiency coefficient of UDRM exceeds 0.9,which indicates its high computational efficiency and potential benefit in predicting urban flooding.The prediction of drainage conditions under both current and re-planned land-use types is achieved by adopting different flood recurrence intervals.The findings reveal that the re-planned land-use strategies could effectively diminish flood risk upstream of the drainage pipe network across 20-year and 50-year flood recurrence intervals.However,in the case of extreme rainfall events(a 100-year flood recurrence),the re-planned land-use approach fell short of fulfilling the requirements necessary for flood disaster mitigation.In these instances,the adoption of larger-diameter drainage pipes becomes an essential requisite to satisfy drainage needs.Accordingly,the proposed UDRM effectively combines land-use information with pipeline data to give practical suggestions for pipeline modification and land-use optimization to combat urban floods.Therefore,this methodology warrants further promotion in the field of urban re-planning.展开更多
In order to understand the current situation of urban sewage treatment and pipe network construction and operation, find out the foundation, find out the sticking point, control the source and stop the pollution, help...In order to understand the current situation of urban sewage treatment and pipe network construction and operation, find out the foundation, find out the sticking point, control the source and stop the pollution, help the water pollution prevention and control, and promote the sustainable development of water environment, this paper investigates the current situation of urban sewage treatment and pipe network construction and operation in Qiannan Prefecture.展开更多
为了更直观、准确地表达和展示地震作用下城市燃气管网在实际地理环境中的空间关系及震害评估分析结果,基于VTK库、Adobe After Effects软件及Python语言提出了一种可全历程展示燃气管网在非一致地震激励下应变及破坏状态三维动态的可...为了更直观、准确地表达和展示地震作用下城市燃气管网在实际地理环境中的空间关系及震害评估分析结果,基于VTK库、Adobe After Effects软件及Python语言提出了一种可全历程展示燃气管网在非一致地震激励下应变及破坏状态三维动态的可视化模型方法。该方法包括3个模块:非一致地震激励下管网的基础数据提取及震害预测、三维可视化模型建立以及三维动态可视化模型建立。以西南某地区埋地燃气管网为例进行三维动态可视化模拟,立体直观展示该市管网在非一致地震激励下不同位置的应变响应及破坏情况,展示了该方法的三维动态可视化效果。展开更多
文摘With a water-supply network by dynamic programming. The minimal as an example, the network was optimized annual discounted costs were taken as an objective function and node pressure etc. as constraint conditions. The alternative pipe diameters were optimized as per enumeration method and the group allowing objective function with the least values would be the optimized one. It is proved the optimized pipe network reduced by 11.49% in terms of cost and the optimized ben- efits proved much significant.
文摘A new geometric modeling approach is introduced in this paper.First the principle of modeling of 3D pipe network is discussed in detail.Then the procedures of implementing pipe network visualization and system functions are presented.Last,several efficient methods for speeding up display of graphics are introduced.The new geometric modeling approach offers to people a new way to solve 3D visualization of complex urban pipe network.
文摘This paper analyzes the pipe network system of oil-gas collection and transportation for offshore oilfield development. A '0-1' integer linear programming model is constructed to optimize the investment of seabed pipe network. The mathematical model is solved by the spanning tree method of graph theory and network analysis. All spanning trees of a network graph compose all the feasible solutions of the mathematical model. The optimal solution of the model is the spanning tree with the minimum cost among all spanning trees. This method can be used to optimize the seabed pipe network system and give a minimum cost plan for the development of offshore marginal oilfield groups.
文摘In this paper the dynamic characteristics in pipes are analyzed with frequency method, and puts forward a simple and practical describing method. By establishing the model library beforehand, the modeling of the pipe net is completed automatically, and we can accurately calculate the impedance characteristics of the pipe network, achieve the reasonable configuration of the pipe network, so that to decrease the pressure pulsation.
文摘The sustainable development of Chinas social economy, the heating pipe network project has also had a great development. At present, the society gives positive encouragement and advocacy to the sustainable development of the project, and takes energy conservation and emission reduction as a very important task at present. Environmental protection has also become the primary factor of project construction. Central heating has been gradually adopted by construction workers in the heat network, mainly because central heating can greatly reduce the cost of the project. But if there is a problem in a node in the heat network, it will lead to a large area of the heat network without heating phenomenon. Therefore, due to the complex pipe network, the quality danger of heating pipe network is easy to occur in the construction process. Strengthening the construction technology is an important basis to ensure the quality.
文摘With the acceleration of urbanization,the demand for water supply and drainage pipe networks has increased significantly.In the planning of urban construction,it is necessary to optimize the design of the water supply and drainage system pipe network to effectively save energy while providing residents with more accessible water resources.Therefore,the municipal water supply and drainage system and the water transmission methods should be designed according to the geographical conditions of the city.In this paper,we mainly analyze the design of municipal water supply and drainage systems and the selection of water transmission methods.Besides,the optimization of the water supply and drainage network zoning process and pipe network maintenance is also discussed,so as to provide a reference for municipal water supply and drainage work.
文摘Since the reform and opening up, China's economic level has gradually improved, and people’s demand for a better life has become increasingly strong. With the rapid development of urbanization, large-scale population and construction facilities gather in the city. Heat energy is an essential energy in people’s life. Central heating engineering has become an essential infrastructure in urban construction. At the same time, heating engineering also implements the strategy of human sustainable development, which is important for improving people’s living standards, protecting the environment and improving the environment. The present situation of gas reservoir plays an important role. The construction of heat pipe network in the city is relatively strict. In order to avoid that the heat pipe network project will affect the interests of residents, public safety and the stability of the whole system due to quality problems, the relevant parties of the project should conduct real-time supervision and inspection according to relevant standards during the construction of facilities. The design documents should be implemented to ensure the scientificity, safety and stability of the project. And improve the efficiency of its system operation, to achieve the purpose of economic operation. This paper makes a detailed analysis and discussion on the importance of the safety construction of the heat pipe network project and the supervision in the construction process, so as to lay a theoretical foundation for the smooth progress of the project.
文摘At present, in the municipal drainage pipe network project, the level of the construction quality of the project whether to play an important correlation. Municipal drainage pipe network engineering in the actual construction, should be closely around the quality control of scientific and reasonable control, take targeted means to increase the quality control, understand the main factors affecting the quality of engineering, develop a scientific and reasonable construction means, to promote the project can play a due value. This paper explores the quality control of such projects.
文摘An efficient numerical method with first and second order accuracy is developed by the flux split technology to simulate the water hammer problem in single and multiple pipe networks under severe transient conditions. The finite volume formulation ensures that both schemes conserve mass and momentum and produces physically realizable shock fronts. The conception of the fictitious cell at the junction is developed. The typical water hammer problem and the experi ment with friction and the comprehensive orbicular network with control valve and pressure relief valve and surge tank are implemented to test the numerical method. Strong numerical evidences show that the proposed scheme has several desirable properties, such as, accurate, efficient, robust, high shock resolution, conservative and stable for Courant number.
基金This work was supported by the Beijing Municipal Planning Committee.The authors thank Mr.Wang Jun and Mr.Liu Jing for their helps.
文摘Water shortage is one of the major water related problems for many cities in the world.The planning for utilization of reclaimed water has been or would be drafted in these cities.For using the reclaimed water soundly,Beijing planned to build a large scale reclaimed water pipe networks with multi-sources.In order to support the plan,the integrated hydraulic model of planning pipe network was developed based on EPANET supported by geographic information system(GIS).The complicated pipe network was divided into four weak conjunction subzones according to the distribution of reclaimed water plants and the elevation.It could provide a better solution for the problem of overhigh pressure in several regions of the network.Through the scenarios analy-sis in different subzones,some of the initial diameter of pipes in the network was adjusted.At last the pipe network planning scheme of reclaimed water was proposed.The proposed planning scheme could reach the balances between reclaimed water requirements and reclaimed water supplies,and provided a scientific basis for the reclaimed water utilization in Beijing.Now the scheme had been adopted by Beijing municipal government.
基金supported by the National Key Research and Development Program of China(Grant No.2022YFC3202002)the National Natural Science Foundation of China(Grant Nos.52025092,52209087 and 52379065).
文摘Effective urban land-use re-planning and the strategic arrangement of drainage pipe networks can significantly enhance urban flood defense capacity.Aimed at reducing the potential risks of urban flooding,this paper presents a straightforward and efficient approach to an urban distributed runoff model(UDRM).The model is developed to quantify the discharge and water depth within urban drainage pipe networks under varying rainfall intensities and land-use scenarios.The Nash efficiency coefficient of UDRM exceeds 0.9,which indicates its high computational efficiency and potential benefit in predicting urban flooding.The prediction of drainage conditions under both current and re-planned land-use types is achieved by adopting different flood recurrence intervals.The findings reveal that the re-planned land-use strategies could effectively diminish flood risk upstream of the drainage pipe network across 20-year and 50-year flood recurrence intervals.However,in the case of extreme rainfall events(a 100-year flood recurrence),the re-planned land-use approach fell short of fulfilling the requirements necessary for flood disaster mitigation.In these instances,the adoption of larger-diameter drainage pipes becomes an essential requisite to satisfy drainage needs.Accordingly,the proposed UDRM effectively combines land-use information with pipeline data to give practical suggestions for pipeline modification and land-use optimization to combat urban floods.Therefore,this methodology warrants further promotion in the field of urban re-planning.
文摘In order to understand the current situation of urban sewage treatment and pipe network construction and operation, find out the foundation, find out the sticking point, control the source and stop the pollution, help the water pollution prevention and control, and promote the sustainable development of water environment, this paper investigates the current situation of urban sewage treatment and pipe network construction and operation in Qiannan Prefecture.
文摘为了更直观、准确地表达和展示地震作用下城市燃气管网在实际地理环境中的空间关系及震害评估分析结果,基于VTK库、Adobe After Effects软件及Python语言提出了一种可全历程展示燃气管网在非一致地震激励下应变及破坏状态三维动态的可视化模型方法。该方法包括3个模块:非一致地震激励下管网的基础数据提取及震害预测、三维可视化模型建立以及三维动态可视化模型建立。以西南某地区埋地燃气管网为例进行三维动态可视化模拟,立体直观展示该市管网在非一致地震激励下不同位置的应变响应及破坏情况,展示了该方法的三维动态可视化效果。
