工程设计学报最新文献_第2页

工程设计学报 Pub Date : 2020-01-01 DOI: 10.3724/sp.j.7103090493

引用次数: 0

Obstacle contained system (OCS) design method and its application in valve core orifice design of pilot-control globe valve 隔障系统设计方法及其在先导控制截止阀阀芯孔板设计中的应用

工程设计学报 Pub Date : 2017-10-28 DOI: 10.3785/J.ISSN.1006-754X.2017.05.002

J. Qian, Zhi-jiang Jin

{"title":"Obstacle contained system (OCS) design method and its application in valve core orifice design of pilot-control globe valve","authors":"J. Qian, Zhi-jiang Jin","doi":"10.3785/J.ISSN.1006-754X.2017.05.002","DOIUrl":"https://doi.org/10.3785/J.ISSN.1006-754X.2017.05.002","url":null,"abstract":"With the development of the society and the times, traditional parametric design methods are witnessing a severe challenge due to the more and more complex physical systems. Thus, developing novel parametric analysis methods is very important for dealing with complex physical systems, refining useful parameters from numerous data, and proposing accurate prediction formulas. A spring slider system, a direct-current circuit system, a pipeline pressure drop system and a steady heat transfer model of flat plate system were described from the point of systemic parametric analysis method. Then, the key physical parameters in above four systems were summarized. Based on the comparative results, a novel systemic parametric design method, obstacle contained system (OCS) design method, was proposed. The OCS was made up of three elements:an obstacle element, a pass body element and a D-value element. With an abundant accurate data pole, the OCS design method could build the direct relationship of the obstacle element and the D-value element, which meant the simplification of the physical models and much easier to get relatively accurate results. Meanwhile, the design of pilot-control globe valve orifice was checked with both the OCS design method and the numerical simulation. The diameter of orifice on the valve core could influence the pressure difference and the maximum vapor rate inside pilot-control globe valves. Achieved by two different methods, the OCS design method and the numerical simulation, the results showed that the effects of orifice diameters on the pressure difference and the maximum vapor rate under different inlet velocities, were within 2% errors, which was reasonable and acceptable for the engineering application. In other words, the OCS design method was credible for parametric analysis. In future, the OCS design method has a broad application prospect to analyze various types of physical models especially in the era of big data.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"24 1","pages":"496-502"},"PeriodicalIF":0.0,"publicationDate":"2017-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44069814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on simulation method of antenna electromechanical coupling based on model reconstruction 基于模型重构的天线机电耦合仿真方法研究

工程设计学报 Pub Date : 2017-07-19 DOI: 10.3785/J.ISSN.1006-754X.2017.02.005

D. Ren, Dan Wang, Xue Zheng, Yong Wang, Ping-an Du

引用次数: 0

An Experimental and Numerical Study on Embedded Rebar Diameter in Concrete Using Ground Penetrating Radar 探地雷达探测混凝土中预埋钢筋直径的试验与数值研究

工程设计学报 Pub Date : 2016-08-17 DOI: 10.1155/2016/9714381

Istiaque Hasan, N. Yazdani

{"title":"An Experimental and Numerical Study on Embedded Rebar Diameter in Concrete Using Ground Penetrating Radar","authors":"Istiaque Hasan, N. Yazdani","doi":"10.1155/2016/9714381","DOIUrl":"https://doi.org/10.1155/2016/9714381","url":null,"abstract":"High frequency ground penetrating radar (GPR) has been widely used to detect and locate rebars in concrete. In this paper, a method of estimating the diameter of steel rebars in concrete with GPR is investigated. The relationship between the maximum normalized positive GPR amplitude from embedded rebars and the rebar diameter was established. Concrete samples with rebars of different diameters were cast and the maximum normalized amplitudes were recorded using a 2.6 GHz GPR antenna. Numerical models using GPRMAX software were developed and verified with the experimental data. The numerical models were then used to investigate the effect of dielectric constant of concrete and concrete cover on the maximum normalized amplitude. The results showed that there is an approximate linear relationship between the rebar diameter and the maximum GPR normalized amplitude. The developed models can be conveniently used to estimate the embedded rebar diameters in existing concrete with GPR scanning; if the concrete is homogeneous, the cover depth is known and the concrete dielectric constant is also known. The models will be highly beneficial in forensic investigations of existing concrete structures with unknown rebar sizes and locations.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"85 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2016-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79361200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Enabling Technologies for Fifth-Generation Mobile Communications 第五代移动通信使能技术

工程设计学报 Pub Date : 2016-04-26 DOI: 10.1155/2016/2847564

Jianhua Zhang, I. Chih-Lin, Juho Lee, Jungnickel Volker, J. Hou, Sujit Dey

引用次数: 4

Research on Joint Handoff Algorithm in Vehicles Networks 车辆网络中的联合切换算法研究

工程设计学报 Pub Date : 2016-04-18 DOI: 10.1155/2016/3190264

Yuming Bi, Lei Tian, Mengmeng Liu, Zhenzi Liu, Wei Chen

引用次数: 3

5G: Vision and Requirements for Mobile Communication System towards Year 2020 5G:面向2020年移动通信系统的愿景与需求

工程设计学报 Pub Date : 2016-04-06 DOI: 10.1155/2016/5974586

Guangyi Liu, D. Jiang

{"title":"5G: Vision and Requirements for Mobile Communication System towards Year 2020","authors":"Guangyi Liu, D. Jiang","doi":"10.1155/2016/5974586","DOIUrl":"https://doi.org/10.1155/2016/5974586","url":null,"abstract":"The forecast for future 10 years’ traffic demand shows an increase in 1000 scales and more than 100 billion connections of Internet of Things, which imposes a big challenge for future mobile communication technology beyond year 2020. The mobile industry is struggling in the challenges of high capacity demand but low cost for future mobile network when it starts to enable a connected mobile world. 5G is targeted to shed light on these contradictory demands towards year 2020. This paper firstly forecasts the vision of mobile communication’s application in the daily life of the society and then figures out the traffic trends and demands for next 10 years from the Mobile Broadband (MBB) service and Internet of Things (IoT) perspective, respectively. The requirements from the specific service and user demands are analyzed, and the specific requirements from typical usage scenarios are calculated by the defined performance indicators. To achieve the target of affordable 5G service, the requirements from network deployment and operation perspective are also captured. Finally, the capabilities and the efficiency requirements of the 5G system are demonstrated as a flower. To realize the vision of 5G, “information a finger away, everything in touch,” 5G will provide the fiber-like access data rate, “zero” latency user experience, and connecting to more than 100 billion devices and deliver a consistent experience across a variety of scenarios with the improved energy and cost efficiency by over a hundred of times.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"13 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80791993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 156

Propagation Channel Comparison between 23.5 and 45 GHz in Conference Scenario 会议场景下23.5 GHz与45ghz传播信道比较

工程设计学报 Pub Date : 2016-03-15 DOI: 10.1155/2016/7124267

Jianwu Dou, N. Zhang, Li Tian, Xiaoyi Yang, Xi Yuan, Suping Mei, Haiming Wang

引用次数: 3

Multiuser Beamforming with Limited Feedback for FDD Massive MIMO Systems FDD大规模MIMO系统的有限反馈多用户波束形成

工程设计学报 Pub Date : 2016-03-07 DOI: 10.1155/2016/9821845

Senyao Zheng, Hui Zhao, Long Zhao, Jie Mei, Weimin Tang

引用次数: 2

Investigation of Control Model in a New Series Hybrid Hydraulic/Electric System for Heavy Vehicles Based on Energy Efficiency 基于能效的重型车辆新型串联式液电混合动力系统控制模型研究

工程设计学报 Pub Date : 2016-03-03 DOI: 10.1155/2016/2417946

Soroosh Mahmoodi, H. Guoqing, M. N. Khajavi

{"title":"Investigation of Control Model in a New Series Hybrid Hydraulic/Electric System for Heavy Vehicles Based on Energy Efficiency","authors":"Soroosh Mahmoodi, H. Guoqing, M. N. Khajavi","doi":"10.1155/2016/2417946","DOIUrl":"https://doi.org/10.1155/2016/2417946","url":null,"abstract":"An interesting model which was able to recuperate and reuse braking energy was investigated. It was named series hybrid hydraulic/electric system (SHHES). The innovated model was presented for heavy hybrid vehicles to overcome the existing drawbacks of single energy storage sources. The novelty of this paper was investigation of a new series hybrid vehicle with triple sources, combustion engine, electric motor, and hydraulic sources. It was simulated with MATLAB-Simulink and different operational mode of control system was investigated. The aim was to improve the efficiency of the energy-loading components in the power train system and the transmission system independently. The ability to store and reuse the kinetic energy was added to the system to prevent energy wasting while the vehicle was braking. Control models were also investigated to realize suitable control algorithms to offer the best efficiency in system components for different vehicle conditions. The torque control strategy based on fuzzy logic controller was proposed to achieve better vehicle performance while the fuel consumption was minimized. The results implied efficient storage and usage in the transmission system. A small vehicle model experimentally verified the simulation results.","PeriodicalId":31263,"journal":{"name":"工程设计学报","volume":"10 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2016-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83272463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3