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Design and optimization of fluid lubricated bearings operated with extreme working performances——a comprehensive review
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作者 Guohua Zhang Ming Huang +6 位作者 Gangli Chen Jiasheng Li Yang Liu Jianguo He Yueqing Zheng Siwei Tang Hailong Cui 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2024年第2期325-376,共52页
Fluid lubricated bearings have been widely adopted as support components for high-end equipment in metrology,semiconductor devices,aviation,strategic defense,ultraprecision manufacturing,medical treatment,and power ge... Fluid lubricated bearings have been widely adopted as support components for high-end equipment in metrology,semiconductor devices,aviation,strategic defense,ultraprecision manufacturing,medical treatment,and power generation.In all these applications,the equipment must deliver extreme working performances such as ultraprecise movement,ultrahigh rotation speed,ultraheavy bearing loads,ultrahigh environmental temperatures,strong radiation resistance,and high vacuum operation,which have challenged the design and optimization of reliable fluid lubricated bearings.Breakthrough of any related bottlenecks will promote the development course of high-end equipment.To promote the advancement of high-end equipment,this paper reviews the design and optimization of fluid lubricated bearings operated at typical extreme working performances,targeting the realization of extreme working performances,current challenges and solutions,underlying deficiencies,and promising developmental directions.This paper can guide the selection of suitable fluid lubricated bearings and optimize their structures to meet their required working performances. 展开更多
关键词 fluid lubricated bearings structural design performance optimization extreme working performances
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Optimization of Laser Ablation Technology for PDPhSM Matrix Nanocomposite Thin Film by Artificial Neural Networks-particle Swarm Algorithm 被引量:3
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作者 唐普洪 宋仁国 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2010年第2期188-193,共6页
A new thermal ring-opening polymerization technique for 1, 1, 3, 3-tetra-ph enyl-1, 3-disilacyclobutane (TPDC) based on the use of metal nanoparticles produced by pulsed laser ablation was investigated. This method ... A new thermal ring-opening polymerization technique for 1, 1, 3, 3-tetra-ph enyl-1, 3-disilacyclobutane (TPDC) based on the use of metal nanoparticles produced by pulsed laser ablation was investigated. This method facilitates the synthesis of polydiphenysilylenemethyle (PDPhSM) thin film, which is difficult to make by conventional methods because of its insolubility and high melting point. TPDC was first evaporated on silicon substrates and then exposed to metal nanoparticles deposition by pulsed laser ablation prior to heat treatment.The TPDC films with metal nanoparticles were heated in an electric furnace in air atmosphere to induce ring-opening polymerization of TPDC. The film thicknesses before and after polymerization were measured by a stylus profilometer. Since the polymerization process competes with re-evaporation of TPDC during the heating, the thickness ratio of the polymer to the monomer was defined as the polymerization efficiency, which depends greatly on the technology conditions. Therefore, a well trained radial base function neural network model was constructed to approach the complex nonlinear relationship. Moreover, a particle swarm algorithm was firstly introduced to search for an optimum technology directly from RBF neural network model. This ensures that the fabrication of thin film with appropriate properties using pulsed laser ablation requires no in-depth understanding of the entire behavior of the technology conditions. 展开更多
关键词 nanocomposite thin film pulsed laser deposition(PLD) artificial neural net- works(ANN) particle swarm optimization (PSO)
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Self-Organized Optimization of Transport on Complex Networks 被引量:2
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作者 牛瑞吾 潘贵军 《Chinese Physics Letters》 SCIE CAS CSCD 2016年第6期153-156,共4页
We propose a self-organized optimization mechanism to improve the transport capacity of complex gradient networks. We find that, regardless of network topology, the congestion pressure can be strongly reduced by the s... We propose a self-organized optimization mechanism to improve the transport capacity of complex gradient networks. We find that, regardless of network topology, the congestion pressure can be strongly reduced by the self-organized optimization mechanism. Furthermore, the random scale-free topology is more efficient to reduce congestion compared with the random Poisson topology under the optimization mechanism. The reason is that the optimization mechanism introduces the correlations between the gradient field and the local topology of the substrate network. Due to the correlations, the cutoff degree of the gradient network is strongly reduced and the number of the nodes exerting their maximal transport capacity consumedly increases. Our work presents evidence supporting the idea that scale-free networks can efficiently improve their transport capacity by self- organized mechanism under gradient-driven transport mode. 展开更多
关键词 of work in that Self-Organized optimization of Transport on Complex Networks is NODE on LINK
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Optimizing Rank of Landscape Planning Works of Urban Wetland Park 被引量:1
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作者 Qiao Li-fang Zhang Yi-chuan +1 位作者 Qi An-guo Li Xin-zheng 《Journal of Northeast Agricultural University(English Edition)》 CAS 2012年第3期87-91,共5页
Classifying and ranking the huge amounts of landscape planning works of urban wetland park is always difficult due to the multi-functions (ecological, leisure, educational and disaster prevention) of the urban wetla... Classifying and ranking the huge amounts of landscape planning works of urban wetland park is always difficult due to the multi-functions (ecological, leisure, educational and disaster prevention) of the urban wetland park. Therefore, an optimizing rank system is urgently needed. Analytic Hierarchy Process (AHP) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) models were used to rank the planning works of 30 urban wetland park based on four mainly factors, which included landscape ecological planning, landscape planning, ecological planning and economic planning. The study indicated that the AHP- TOPSIS model had good discrimination in the classification and ranking of landscape planning works of urban wetland park and it was also applicable to the planning works of other urban greenbelts. 展开更多
关键词 landscape planning work optimizing rank urban wetland park Analytic Hierarchy Process (AHP) Technique for Order Preference by Similarity to Ideal Solution (TOPSIS)
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Teamwork Optimization with Deep Learning Based Fall Detection for IoT-Enabled Smart Healthcare System
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作者 Sarah B.Basahel Saleh Bajaba +2 位作者 Mohammad Yamin Sachi Nandan Mohanty E.Laxmi Lydia 《Computers, Materials & Continua》 SCIE EI 2023年第4期1353-1369,共17页
The current advancement in cloud computing,Artificial Intelligence(AI),and the Internet of Things(IoT)transformed the traditional healthcare system into smart healthcare.Healthcare services could be enhanced by incorp... The current advancement in cloud computing,Artificial Intelligence(AI),and the Internet of Things(IoT)transformed the traditional healthcare system into smart healthcare.Healthcare services could be enhanced by incorporating key techniques like AI and IoT.The convergence of AI and IoT provides distinct opportunities in the medical field.Fall is regarded as a primary cause of death or post-traumatic complication for the ageing population.Therefore,earlier detection of older person falls in smart homes is required to improve the survival rate of an individual or provide the necessary support.Lately,the emergence of IoT,AI,smartphones,wearables,and so on making it possible to design fall detection(FD)systems for smart home care.This article introduces a new Teamwork Optimization with Deep Learning based Fall Detection for IoT Enabled Smart Healthcare Systems(TWODLFDSHS).The TWODL-FDSHS technique’s goal is to detect fall events for a smart healthcare system.Initially,the presented TWODL-FDSHS technique exploits IoT devices for the data collection process.Next,the TWODLFDSHS technique applies the TWO with Capsule Network(CapsNet)model for feature extraction.At last,a deep random vector functional link network(DRVFLN)with an Adam optimizer is exploited for fall event detection.A wide range of simulations took place to exhibit the enhanced performance of the presentedTWODL-FDSHS technique.The experimental outcomes stated the enhancements of the TWODL-FDSHS method over other models with increased accuracy of 98.30%on the URFD dataset. 展开更多
关键词 Internet of things smart healthcare deep learning team work optimizer capsnet fall detection
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基于COSMOS/Works的数控机床主轴箱模态分析及优化设计 被引量:5
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作者 邱海飞 王增强 《机械传动》 CSCD 北大核心 2012年第11期77-79,共3页
在COSMOS/Works环境下创建了数控机床主轴箱有限元模型,并对其进行模态分析,获得了关心的自振频率及振型。在此基础上,定义多个结构尺寸作为设计变量,对主轴箱动态特性进行优化,结果使其基频得以明显提高,有效增强了箱体的抗振性能。计... 在COSMOS/Works环境下创建了数控机床主轴箱有限元模型,并对其进行模态分析,获得了关心的自振频率及振型。在此基础上,定义多个结构尺寸作为设计变量,对主轴箱动态特性进行优化,结果使其基频得以明显提高,有效增强了箱体的抗振性能。计算得出了一组具有良好动态特性的结构参数,为主轴箱的结构设计提供了重要参考。 展开更多
关键词 主轴箱 动态特性 有限元 基频 优化 COSMOS/works
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基于HyperWorks的某动力电池总成固定支架结构优化技术 被引量:8
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作者 刘涛 《农业装备与车辆工程》 2016年第5期78-81,共4页
在某电动商用车基础之上设计一种动力电池总成的固定支架结构。在考虑到动力电池总成固定支架安全性能的前提下,使用Hyper Works软件对动力电池总成固定支架模型进行了网格划分、仿真分析,通过仿真分析的结果对固定支架的材料进行优化... 在某电动商用车基础之上设计一种动力电池总成的固定支架结构。在考虑到动力电池总成固定支架安全性能的前提下,使用Hyper Works软件对动力电池总成固定支架模型进行了网格划分、仿真分析,通过仿真分析的结果对固定支架的材料进行优化。通过整车强化路面的可靠性试验证明,优化后的固定支架满足整车强度要求,大大提高了设计效率,进而节约了产品的研发成本。 展开更多
关键词 动力电池总成固定支架 HYPERworks 结构优化
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Multi-energy synergistic optimization in steelmaking process based on energy hub concept 被引量:4
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作者 Shuai Liu Sheng Xie Qi Zhang 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2021年第8期1378-1386,共9页
The production process of iron and steel is accompanied by a large amount of energy production and consumption. Optimal scheduling and utilization of these energies within energy systems are crucial to realize a reduc... The production process of iron and steel is accompanied by a large amount of energy production and consumption. Optimal scheduling and utilization of these energies within energy systems are crucial to realize a reduction in the cost, energy use, and CO_2 emissions.However, it is difficult to model and schedule energy usage within steel works because different types of energy and devices are involved. The energy hub(EH), as a universal modeling frame, is widely used in multi-energy systems to improve its efficiency, flexibility, and reliability.This paper proposed an efficient multi-layer model based on the EH concept, which is designed to systematically model the energy system and schedule energy within steelworks to meet the energy demand. Besides, to simulate the actual working conditions of the energy devices, the method of fitting the curve is used to describe the efficiency of the energy devices. Moreover, to evaluate the applicability of the proposed model, a case study is conducted to minimize both the economic operation cost and CO_2 emissions. The optimal results demonstrated that the model is suitable for energy systems within steel works. Further, the economic operation cost decreased by 3.41%, and CO_2 emissions decreased by approximately 3.67%. 展开更多
关键词 multi-energy system energy hub optimization steel works
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Optimal arrangement for pressure measurement points in working chamber of earth pressure balance shield 被引量:4
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作者 刘畅 屈福政 +1 位作者 李守巨 孟庆琳 《Journal of Central South University》 SCIE EI CAS 2012年第7期1883-1891,共9页
In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamb... In order to exactly provide scientific basis for pressure dynamic balance control of working chamber of earth pressure balance shield (EPBS),study on optimal arrangement of pressure measurement points in working chamber was conducted. Based on mathematical description of optimal arrangement for pressure measurement points,fuzzy clustering analysis and discriminant analysis were used to divide pressure regions of nodes on bulkhead. Finally,the selection method of optimal measurement points was proposed,and by selecting d6.28 m EPBS as study object,the case study was conducted. By contrast,based on optimal arrangement scheme of pressure measurement points,through adopting weighted algorithm,the absolute error mean of equivalent pressure of working chamber is the smallest. In addition,pressure curve of optimal arrangement points presents parabola,and it can show the state of pressure distribution on bulkhead truly. It is concluded that the optimal arrangement method of pressure measurement points in working chamber is effective and feasible,and the method can provide basis for realizing high precision pressure control of EPBS. 展开更多
关键词 TUNNELING earth pressure balance shield working chamber optimal arrangement discrete element method
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Parametric optimization and performance comparison of organic Rankine cycle with simulated annealing algorithm 被引量:3
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作者 王志奇 周乃君 +2 位作者 张家奇 郭静 王晓元 《Journal of Central South University》 SCIE EI CAS 2012年第9期2584-2590,共7页
Taking the ratio of heat transfer area to net power and heat recovery efficiency into account, a multi-objective mathematical model was developed for organic Rankine cycle (ORC). Working fluids considered were R123,... Taking the ratio of heat transfer area to net power and heat recovery efficiency into account, a multi-objective mathematical model was developed for organic Rankine cycle (ORC). Working fluids considered were R123, R134a, R141b, R227ea and R245fa. Under the given conditions, the parameters including evaporating and condensing pressures, working fluid and cooling water velocities were optimized by simulated annealing algorithm. The results show that the optimal evaporating pressure increases with the heat source temperature increasing. Compared with other working fluids, R123 is the best choice for the temperature range of 100--180℃ and R141 b shows better performance when the temperature is higher than 180 ℃. Economic characteristic of system decreases rapidly with the decrease of heat source temperature. ORC system is uneconomical for the heat source temperature lower than 100℃. 展开更多
关键词 parametric optimization organic Rankine cycle simulated annealing algorithm working fluid low-temperature source
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Effects of fluid flow rate and viscosity on gravel-pack plugging and the optimization of sand-control wells production 被引量:2
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作者 DONG Changyin ZHOU Yugang +4 位作者 CHEN Qiang ZHU Chunming LI Yanlong LI Xiaobo LIU Yabin 《Petroleum Exploration and Development》 2019年第6期1251-1259,共9页
Series of experiments were performed to simulate the invasion of formation sand into and the plugging process of gravel-pack at different viscosities and flowing rates of fluid.Two types of formation sands with the me... Series of experiments were performed to simulate the invasion of formation sand into and the plugging process of gravel-pack at different viscosities and flowing rates of fluid.Two types of formation sands with the medium size of 0.10 mm and 0.16 mm and the quartz sand and ceramsite of 0.6-1.2 mm were used in the experiments.A new viscosity-velocity index(the product of fluid viscosity and velocity)was put forward to characterize the influencing mechanism and law of physical property and flow condition of formation fluid on gravel-pack plugging,and a new method to optimize the production rate of wells controlling sand production with gravel-packing was proposed.The results show that the permeability of formation sand invaded zone and final permeability of plugged gravel-pack have negative correlations with viscosity and flow velocity of fluid,the higher the flow velocity and viscosity,the lower the permeability of formation sand invaded zone and final permeability of plugged gravel-pack will be.The flow velocity and viscosity of fluid are key factors affecting plugging degree of the gravel zone.The viscosity-velocity index(v-v index)can reflect the flow characteristics of fluid very well and make it easier to analyze the plugging mechanism of gravel zone.For different combinations of fluid viscosity and flow velocity,if the v-v index is the same or close,their impact on the final gravel permeability would be the same or close.With the increase of the v-v index,the permeability of plugged gravel zone decreases first,then the reduction rate slows down till the permeability stabilizes.By optimizing production and increasing production step by step,the optimal working scheme for sand-control well can reduce the damage to gravel-pack zone permeability caused by sand-carrying fluid effectively,and increase well productivity and extend the sand control life. 展开更多
关键词 gravel-pack sand RETENTION experiment plugging law viscosity-velocity index working scheme optimization method plugging simulation
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Energy saving analysis of segment positioning in shield tunneling machine considering assembling path optimization 被引量:4
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作者 施虎 龚国芳 +1 位作者 杨华勇 梅雪松 《Journal of Central South University》 SCIE EI CAS 2014年第12期4526-4536,共11页
A motion parameter optimization method based on the objective of minimizing the total energy consumption in segment positioning was proposed for segment erector of shield tunneling machine. The segment positioning pro... A motion parameter optimization method based on the objective of minimizing the total energy consumption in segment positioning was proposed for segment erector of shield tunneling machine. The segment positioning process was decomposed into rotation, lifting and sliding actions in deriving the energy calculation model of segment erection. The work of gravity was taken into account in the mathematical modeling of energy consumed by each actuator. In order to investigate the relationship between the work done by the actuator and the path moved along by the segment, the upward and downward directions as well as the operating quadrant of the segment erector were defined. Piecewise nonlinear function of energy was presented, of which the result is determined by closely coupled components as working parameters and some intermediate variables. Finally, the effectiveness of the optimization method was proved by conducting a case study with a segment erector for the tunnel with a diameter of 3 m and drawing comparisons between different assembling paths. The results show that the energy required by assembling a ring of segments along the optimized moving path can be reduced up to 5%. The method proposed in this work definitely provides an effective energy saving solution for shield tunneling machine. 展开更多
关键词 energy saving segment erector work of gravity path optimization shield tunneling machine
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Analysis on optimal working fluid flowrate and unstable power generation for miniaturized ORC systems 被引量:1
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作者 刘克涛 朱家玲 +1 位作者 胡开永 吴秀杰 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第5期1224-1231,共8页
For efficient utilization of a limited geothermal resource in practical projects,the cycle parameters were comprehensively analyzed by combining with the heat transfer performance of the plate heat exchanger,with a va... For efficient utilization of a limited geothermal resource in practical projects,the cycle parameters were comprehensively analyzed by combining with the heat transfer performance of the plate heat exchanger,with a variation of flowrate of R245 fa.The influence of working fluid flowrate on a 500 W ORC system was investigated.Adjusting the working fluid flowrate to an optimal value results in the most efficient heat transfer and hence the optimal heat transfer parameters of the plate heat exchanger can be determined.Therefore,for the ORC systems,optimal working fluid flowrate should be controlled.Using different temperature hot water as the heat source,it is found that the optimal flowrate increases by 6-10 L/h with 5 ℃ increment of hot water inlet temperature.During experiment,lower degree of superheat of the working fluid at the outlet the plate heat exchanger may lead to unstable power generation.It is considered that the plate heat exchanger has a compact construction which makes its bulk so small that liquid mixture causes the unstable power generation.To avoid this phenomenon,the flow area of plate heat exchanger should be larger than the designed one.Alternatively,installing a small shell and tube heat exchanger between the outlet of plate heat exchanger and the inlet of expander can be another solution. 展开更多
关键词 organic Rankine cycle (ORC) plate heat exchanger optimal working fluid flowrate unstable power generation
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Determination of Optimal Work Roll Profile for Cold Strip Mill
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作者 Wang Hongxu Lian Jiachuang Liu Hongmin 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 1998年第1期8-12,共5页
The model of predicting distribution of strip thickness at the exit and tension stress is established by using weighted residual method and variational method with consideration of rolled metal lateral flow.A New meth... The model of predicting distribution of strip thickness at the exit and tension stress is established by using weighted residual method and variational method with consideration of rolled metal lateral flow.A New method of calculating loaded roll gap in relation to target tension stress is proposed.The minimum square summation of loaded roll gap deviation is used as an objective function for the first time to optimize initial work roll profile. 展开更多
关键词 work roll profile cold rolling optimization weighted residual method variational method STRIP
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An Intelligent Optimization Method of Reinforcing Bar Cutting for Construction Site
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作者 Zhaoxi Ma Qin Zhao +3 位作者 Tianyou Cang Zongjian Li Yiyun Zhu Xinhong Hei 《Computer Modeling in Engineering & Sciences》 SCIE EI 2023年第1期637-655,共19页
To meet the requirements of specifications,intelligent optimization of steel bar blanking can improve resource utilization and promote the intelligent development of sustainable construction.As one of the most importa... To meet the requirements of specifications,intelligent optimization of steel bar blanking can improve resource utilization and promote the intelligent development of sustainable construction.As one of the most important building materials in construction engineering,reinforcing bars(rebar)account for more than 30%of the cost in civil engineering.A significant amount of cutting waste is generated during the construction phase.Excessive cutting waste increases construction costs and generates a considerable amount of CO_(2)emission.This study aimed to develop an optimization algorithm for steel bar blanking that can be used in the intelligent optimization of steel bar engineering to realize sustainable construction.In the proposed algorithm,the integer linear programming algorithm was applied to solve the problem.It was combined with the statistical method,a greedy strategy was introduced,and a method for determining the dynamic critical threshold was developed to ensure the accuracy of large-scale data calculation.The proposed algorithm was verified through a case study;the results confirmed that the rebar loss rate of the proposed method was reduced by 9.124%compared with that of traditional distributed processing of steel bars,reducing CO_(2)emissions and saving construction costs.As the scale of a project increases,the calculation quality of the optimization algorithmfor steel bar blanking proposed also increases,while maintaining high calculation efficiency.When the results of this study are applied in practice,they can be used as a sustainable foundation for building informatization and intelligent development. 展开更多
关键词 Building construction rebar work cutting stock problem optimization algorithm integer linear programming
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基于SolidWorks Flow Simulation的热电制冷箱装配体安装架构的仿真优化 被引量:4
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作者 邵夏勇 张治国 +4 位作者 李国能 叶阳辉 邓斌 王晴 Obinani Victor Chimdike 《发电技术》 2021年第3期374-381,共8页
为了提高热电制冷箱的制冷性能,对市面上常见的热电(半导体)制冷箱进行分析,并对制冷箱的制冷装配体与箱壁之间的架构方式进行探究。采用仿真工具SolidWorks Flow Simulation对制冷箱的制冷装配体与箱壁之间的架构方式进行建模仿真。分... 为了提高热电制冷箱的制冷性能,对市面上常见的热电(半导体)制冷箱进行分析,并对制冷箱的制冷装配体与箱壁之间的架构方式进行探究。采用仿真工具SolidWorks Flow Simulation对制冷箱的制冷装配体与箱壁之间的架构方式进行建模仿真。分析了重力、风扇方向、开槽尺寸、槽内所加支架等参数对半导体制冷箱制冷性能的影响规律,结果表明:制冷箱在开槽尺寸一定时,重力方向处于箱体尺寸最长边,风扇进气方向为吸气,槽内加对称支架,并对支架的4个侧面做尽可能多的圆形镂空处理,且圆越大越好,此时热电制冷箱的制冷性能最优。 展开更多
关键词 热电制冷箱 Solidworks Flow Simulation 安装架构 优化分析
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Optimal Model and Solution of Railway Hub Shift Working Plan
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作者 He Shiwei Zhu Songnian Lin Boliang Department of Transportation Engineering,Southwest Jiaotong University,Chengdu 610031,China 《Journal of Modern Transportation》 1996年第2期72-80,共9页
Aiming at decreasing the hub transportation costs, a railway hub shift working plan in terms of multicommodity network flow model is set up for considering ... Aiming at decreasing the hub transportation costs, a railway hub shift working plan in terms of multicommodity network flow model is set up for considering the coordination of freight working,train working and locomotive working plans.The solution and the calculating results are also introduced. 展开更多
关键词 railway hub dispatching automation optimization shift working plan
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基于Workbench的装载机工作装置的优化分析 被引量:3
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作者 赵海霞 管清正 扈艳萍 《起重运输机械》 2016年第12期78-81,共4页
运用Ansys Workbench对装载机的工作装置进行结构分析,绘出工作装置的应力图;运用Design Exploration功能得出工作装置尺寸参数与最大等效应力的关系,并得出最优值。结果表明:在工作装置工作过程中,动臂前端应力是最大的,对动臂前端尺... 运用Ansys Workbench对装载机的工作装置进行结构分析,绘出工作装置的应力图;运用Design Exploration功能得出工作装置尺寸参数与最大等效应力的关系,并得出最优值。结果表明:在工作装置工作过程中,动臂前端应力是最大的,对动臂前端尺寸参数进行优化设计后,可在不增加动臂质量的前提下最大限度降低最大等效应力。AWE优化分析可以得出最优设计值,为后续工作装置的设计提供快速、有效的方法。 展开更多
关键词 装载机 工作装置 等效应力 workBENCH 优化分析 静力学分析
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Optimal Planning of Hybrid AC/DC Low-voltage Distribution Networks Considering DC Conversion of Three-phase Four-wire Low-voltage AC Systems
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作者 Bo Zhang Lu Zhang +2 位作者 Wei Tang Gen Li Chen Wang 《Journal of Modern Power Systems and Clean Energy》 SCIE EI CSCD 2024年第1期141-153,共13页
The increasing integration of distributed household photovoltaics(PVs)and electric vehicles(EVs)may further ag gravate voltage violations and unbalance of low-voltage distribu tion networks(LVDNs).DC distribution netw... The increasing integration of distributed household photovoltaics(PVs)and electric vehicles(EVs)may further ag gravate voltage violations and unbalance of low-voltage distribu tion networks(LVDNs).DC distribution networks can increase the accommodation of PVs and EVs and mitigate mutilple pow er quality problems by the flexible power regulation capability of voltage source converters.This paper proposes schemes to es tablish hybrid AC/DC LVDNs considering the conversion of the existing three-phase four-wire low-voltage AC systems to DC op eration.The characteristics and DC conversion constraints of typical LVDNs are analyzed.In addition,converter configura tions for typical LVDNs are proposed based on the three-phase four-wire characteristics and quantitative analysis of various DC configurations.Moreover,an optimal planning method of hybrid AC/DC LVDNs is proposed,which is modeled as a bi-level programming model considering the annual investments and three-phase unbalance.Simulations are conducted to verify the effectiveness of the proposed optimal planning method.Sim ulation results show that the proposed optimal planning method can increase the integration of PVs while simultaneously reduc ing issues related to voltage violation and unbalance. 展开更多
关键词 optimal planning low-voltage distribution net work three-phase unbalance DC conversion
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高河能源掘进工作面产尘机理及运移规律数值模拟研究
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作者 王凯 《煤矿现代化》 2025年第1期12-18,共7页
高河能源公司掘进工作面产尘强度大且回采深度逐年增加,在空气流场的作用下,常规治尘措施难以对粉尘进行有效拦截。为此,对掘进工作面产尘机理及运移规律开展数值模拟研究。首先,开展现场掘进过程压入式、抽出式风量测试,随后建立掘进... 高河能源公司掘进工作面产尘强度大且回采深度逐年增加,在空气流场的作用下,常规治尘措施难以对粉尘进行有效拦截。为此,对掘进工作面产尘机理及运移规律开展数值模拟研究。首先,开展现场掘进过程压入式、抽出式风量测试,随后建立掘进工作面DPM模型,构建掘进面物理模型,得到巷道中粉尘浓度分布与粒径分布特性。最后开展掘进过程粉尘浓度分布测试。试验结果表明:掘进机司机位置处总尘浓度最高值、平均浓度、呼尘浓度最高值、平均浓度;转载机位置总尘、呼尘浓度的平均值;控风风筒后方总尘、呼尘浓度的平均值,经与数值模拟结果与现场实测结果对比,模拟精度大于85%,与现场情况基本一致。 展开更多
关键词 高河能源 工作面产尘 数值模拟 优化试验
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