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2016年第11期

时间:2016-11-08 14:23:13??来源:??作者:

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刘小会1,张路飞1,严波2,张晓艳1
1.重庆交通大学,重庆 4000742.重庆大学,重庆 400044
摘要:对单档舞动引起的连续档输电线大幅振动进行了参数分析。利用ABAQUS软件建立考虑绝缘子串的连续档覆冰输电线的精细有限元模型,通过用户自定义单元子程序UEL定义空气动力载荷单元,实现单档舞动引起整个连续档大幅振动的数值模拟。数值模拟结果表明档距、张力等结构参数对连续档输电线位移及应力振幅有较大的影响,低阶模态对位移振动幅值影响较大,而高阶模态对应力振动幅影响明显。通过参数分析可找到线路结构参数对位移及应力振动幅值的影响规律,应用于线路设计降低舞动的破坏。所得结果对连续档覆冰导线防舞技术的研究具有一定参考价值
关键词:舞动;有限元;连续档;输电导线
中图分类号:TM753;TM039????? 文献标识码:A??? ??文章编号:1004-731X (2016) 11-2647-08
DOI: 10.16182/j.issn1004731x.joss.201611001
Modal Analysis of Iced Conductor Galloping for Continuous Spans
Liu Xiaohui1, Zhang Lufei1, Yan Bo2, Zhang Xiaoyan1
(1. Chongqing Jiaotong University, Chongqing 400074, China; 2. Chongqing University, Chongqing 400044, China)
Abstract:The parameter analysis was presented for continuous spans vibration induced by single-span conductor galloping. The fine finite element model of continous spans and insulator strings was set up by ABAQUS softwart, the aerodynamic load was defined by UEL. So the dynamic response of continuous spans induced by single-span conductor galloping were numerically simulated in ABAQUS. The numerical simulation results show that the structure parameters have obvious effect on the vibration amplitude of the displacements and tention, low order modes have great influence on the vibration amplitede of the displacements, high order modes have great influence on the vibration amplitude of the tention. The galloping damage can be reduced in transmission line design using the conclusions of parameter analysis. The conclusion is a useful reference for anti-galloping of continuous spans.
Keywords: galloping; finite element; continuous spans; transmission line conducto
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基于无标度网络的人工股市羊群行为仿真研究
吴江1,张辉2,唐川3
(1. 西南财经大学统计学院管理科学系,成都 611130;2. 华夏银行个人业务部,北京 100005;mQwag8879环亚手机|首页主页
3. 大公国际资信评估有限公司公用事业部,北京 100125)
摘要:为了研究投资者羊群行为产生的内在机理,利用多Agent建模仿真方法构建了基于无标度网络投资者关系的人工股市模型;定义了基础价值投资者、噪声交易者、投机者以及趋势策略交易者四类投资者,每类投资者按其特定投资策略进行交易的同时还受周围邻居的影响,这样投资者之间将产生相互模仿的羊群行为。仿真实验结果表明,人工股市中总的羊群行为水平与市场收益率波动性呈现较为明显的正相关关系,四类投资者羊群行为水平存在较为明显的差异。
关键词:仿真;羊群行为;人工股票市场;无标度网络
中图分类号:F830;TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2655-08
DOI: 10.16182/j.issn1004731x.joss.201611002
Research on Herd Behavior Simulation Based on Scale Free Network in Artificial Stock Market
Wu Jiang1, Zhang Hui2, Tang Chuan3
(1. Department of Management Science, School of Statistics, Southwestern University of Finance & Economics, Chengdu 611130, China;mQwag8879环亚手机|首页主页
2. Personal Business Department, Huaxia Bank, Beijing 100005, China;mQwag8879环亚手机|首页主页
3. Puplic Utilities Department, Dagong Global Credit Rating Company Limited, Beijing 100125,China)
Abstract: To study the mechanism of herd behavior, an artificial stock market multi-agents model was established based on a scale free network investor relationship structure. Four kinds of investors were defined, which are fundamentalists, noise traders, speculators, and trend followers. Investors made a transaction according to their own specific investment strategy, and were meanwhile influenced from own neighbors, so the herd behavior came into being among these investors. The simulation results show that there is a positive relationship between the total herd behavior level of investors and the volatility of returns, and a significant difference between herding levels for four types of investors.
Keywords: simulation; herd behavior; artificial stock market; scale free network
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基于实时修正函数模糊控制的BLDCM建模及仿真
邓元望,曾俊
(湖南大学机械与运载工程学院,长沙 410082)
摘要:在分析无刷直流电机(BLDCM,Brushless Direct Current Motor)数学模型的基础上,提出了一种BLDCM仿真模型建立的新方法MATLAB中利用C MEX S-函数搭建无刷直流电机模型仿真结果表明建模方法提高了仿真效率基于所建立的BLDCM仿真模型引进一个修正函数并建立了自调整模糊控制器修正函数能根据动态误差和误差变化率实时调整模糊控制规则。自调整模糊控制器有6个调节参数,利用MATLAB自带的遗传算法工具箱离线组合优化这些参数,并将优化后的自调整模糊控制器和数字PI控制器以及基本模糊控制器对比仿真,结果表明带有修正函数的自调整模糊控制器具有最优的控制效果。
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2663-07
DOI: 10.16182/j.issn1004731x.joss.201611003
Modeling and Simulation of BLDCM Fuzzy Control System with Real-time Modification Function
Deng Yuanwang, Zeng Jun
(School of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China)
Abstract:Based on the analysis of the mathematical model of brushless direct current motor (BLDCM), a novel method for modeling of BLDCM was proposed. In MATLAB, the model of BLDCM was established by C MEX S-function, and the simulation results showed that the proposed method can enhance the simulation efficiency. Based on the modeling and simulation of BLDCM, a modification function was introduced and a self-turning fuzzy controller was built. According to the error and error rate of speed, the proposed modification function performed real-time regulation of fuzzy rules. There were six regulation parameters in the self-turning fuzzy controller, and these parameters could be optimized off-line by the genetic algorithm toolbox of MATLAB.Besides, a contrast simulation was performed among digital PI controller, basic fuzzy controller and the self-turning fuzzy controller with the optimized parameters, and simulation results indicateed that the last controller can provide the best control effect.
Keywords: BLDCM; modification function; fuzzy control rule; S-function; contrast simulation
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宏微3-RPR并联机构建模及控制仿真研究
许有熊,周浩,朱松青,顾人杰
(南京工程学院,南京 211167)
摘要:为解决并联机构大行程与高精度定位的矛盾,提出了一种采用电液伺服控制系统为宏驱动、压电精密控制系统为微驱动的宏微3-RPR并联机构,基于虚功原理推导了其动力学模型;搭建了其基于多软件协同仿真模型,其中包括Adams机械模块、AMESim液压与压电驱动模块、Matlab/Simulink控制模块;针对该并联机构是个复杂的多输入多输出非线性系统,采用模糊PID方法对其进行控制仿真研究。仿真表明:与常规PID相比,采用模糊PID能缩短响应时间,实现无超调的宏微切换过程;采用宏微驱动的并联机构能实现大行程的精密定位,具有良好的控制效果。
关键词:宏微驱动;3-RPR;并联机构;模糊PID;控制仿真
中图分类号:TP242????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2670-07
DOI: 10.16182/j.issn1004731x.joss.201611004
Modeling and Control Simulation Research of Macro-micro 3-RPR Parallel Mechanism
Xu Youxiong, Zhou Hao, Zhu Songqing, Gu Renjie
(Nanjing Institute of Technology, Nanjing 211167, China)
Abstract: According to the contradiction between the large stroke and high precision of the parallel mechanism, a novel macro-micro 3-RPR parallel mechanism was presented which used the electrohydraulic servo control system as the macro driven and used the piezoelectric precision control system as the micro driven. Then, the macro-micro coupling dynamic model of the macro-micro 3-RPR parallel mechanism was deduced by principle of Virtual work. Its multi-software co-simulation model was built, including Adams mechanical module, AMESim hydraulic and piezoelectric diver module, Matlab/Simulink control module. According to the 3-RPR parallel mechanism characteristics of multi-input multi-output, nonlinear, strong coupling and so on, its control simulation research was conducted by using the fuzzy PID method. The simulation results show that compared with traditional PID, the single rod static and dynamic performance is improved by using the fuzzy control method and the macro-micro 3-RPR parallel mechanism can achieve high precision positioning of large stroke.
Keywords: macro-micro driven; 3-RPR; parallel mechanism; fuzzy PID; control simulation
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基于主成分分析的仿真模型选择方法
焦松,毛少杰,居真奇,楚威
(中国电科28所信息系统工程重点实验室,南京 210007
摘要:为了减少在参考输出完备时仿真模型选择的主观性,提出了基于主成分分析和灰色综合评判的仿真模型选择方法。依据数据特征将仿真输出分为静态、缓变和速变三类数据,并分别从多个方面充分刻画了各类数据之间的差异;基于主成分分析从多个相关的数据差异中提取出少数几个独立的主成分;利用灰色综合评判对主成分进行综合分析,进而得到仿真模型的选择结果。通过实例应用,表明了方法的有效性。
关键词:仿真模型选择;仿真模型可信性;主成分分析;灰色综合评判
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2677-07
DOI: 10.16182/j.issn1004731x.joss.201611005
Selection of simulation model based on principal component analysis
Jiao Song, Mao Shaojie, Ju Zhenqi, Chu Wei
(Science and Technology on Information Systems Engineering Laboratory,mQwag8879环亚手机|首页主页
The 28th Research Institute of China Electronics Technology Group Corporation, Nanjing 210007, China)
Abstract: To reduce the subjectivity of result for selecting the simulation model when the reference output is complete, the selection method of simulation model based on principal component analysis and grey comprehensive evaluation was proposed. The simulation outputs were divided into three kinds of static data, gradual data and fast data according to the data feature, and the measure models of differences for each kind data were given. The correlation among the feature differences was eliminated via principal component analysis, and several independent principal components were gained. The independent principal components were integrated based on grey comprehensive evaluation, and the selection result of simulation model was gained. In the application, the validity of the method is showed.
Keywords: selection of simulation model; credibility of simulation model; principal component analysis; grey comprehensive evaluation
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基于反向学习的自适应快速人工蜂群算法
杨小健,董毅伟
(南京工业大学电子与信息工程学院,南京 211816)
摘要:针对人工蜂群算法收敛速度慢、收敛精度不高、易陷入局部收敛等缺点,提出一种基于反向学习的自适应快速人工蜂群算法。研究出一种新型自适应步长,使得快速人工蜂群算法跟随蜂搜索阶段的周边食物源参数自适应化,并结合反向学习策略来改进引领蜂搜索阶段。在保证收敛速度的前提下进一步提高解的全局性。在仿真实验中加入粒子群算法和布谷鸟搜索算法的函数优化实验。对标准函数的仿真结果表明,基于反向学习的自适应快速人工蜂群算法相较于标准人工蜂群算法和快速人工蜂群算法在优化性能方面得到明显改善,其优化性能也明显优于粒子群算法和布谷鸟搜索算法
关键词:人工蜂群算法;自适应;反向学习;优化
中图分类号:TP301.6????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2684-09
DOI: 10.16182/j.issn1004731x.joss.201611006
Adaptive Quick Artificial Bee Colony Algorithm Based on Opposition Learning
Yang Xiaojian, Dong Yiwei
(College of Electronics and Information Engineering, Nanjing Tech University, Nanjing 211816, China)
Abstract: On the basis of analyzing such shortcomings of the artificial bee colony algorithm (ABC) as slow convergence, low convergence precision and premature convergence, the opposition-learning adaptive quick artificial bee colony algorithm (OAQABC) was proposed. A new step size was proposed, which made the around food source parameter of quick artificial bee colony algorithm (QABC) adaptive, and combined the opposition-based learning to improve the employed bee phase. The experimental results show that OAQABC has better performance than basic ABC and QABC. Also the optimization performance of OAQABC is better than particle swarm optimization (PSO) algorithm and Cuckoo Search (CS) algorithm obviously in the experiment.
Keywords: artificial bee colony (ABC); adaptive; opposition-based learning; optimization
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一种基于OPNETCAN总线仿真系统
刘宴涛,徐静,夏桂阳,秦娜
(渤海大学工学院,辽宁 锦州 121013)
摘要:CAN(Controller Area Network)总线是一种典型的串行通信协议,它采用非破坏性的比特仲裁机制解决总线冲突。为实现CAN总线比特仲裁机制的仿真研究,基于OPNET仿真环境建立了CAN总线协议介质访问控制子层(MAC, Multiple Access Control)的仿真模型,以及CAN总线的进程模型、节点模型和网络模型。通过运行所建立的仿真模型,统计存在总线争用和不存在总线争用两种情况下仿真网络的端到端延时情况。运行了大量的仿真实验并对仿真结果进行了严格的理论分析,证明了MAC进程模型的正确性。所建立的仿真模型可用于对CAN总线进行仿真研究和工业应用。
关键词:CAN总线;总线冲突;比特仲裁;网络仿真
中图分类号:TP393????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2692-09
DOI: 10.16182/j.issn1004731x.joss.201611007
CAN Bus Simulation System Based on OPNET
Liu Yantao, Xu Jing, Xia Guiyang, Qin Na
(College of Engineering, Bohai University, Jinzhou 121013, China)
Abstract: CAN (Controller Area Network) is a typical kind of serial communication protocol. To solve the problem of bus contention, CAN adopts the mechanism of non-destructive bitwise arbitration. In order to realize simulation study on this mechanism, simulation models of Medium Access Control (MAC), process models, node models and network model of CAN were built. End-to-End delay of the simulation network was obtained by simulating these models under the condition of whether there existed a bus contention. The correctness of these models was proved by extensive simulation experiments and rigorous analyses. The models can be used in simulation study and industry application.
Keywords: CAN bus; bus contention; bitwise arbitration; network simulation
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遥操作训练仿真系统的月球车虚拟样机设计
苗毅,周倜
(北京航天飞行控制中心,北京 100094)
摘要:为适应遥操作训练仿真的需要,研究了基于ADAMS的月球车虚拟样机仿真建模方法,提出了月球车仿真系统框架,建立了月球车本体三维模型,分析了各部件之间的相对运动关系,并对相对固定的部件进行了组合划分,为存在相对运动的部件采用运动副建立了约束关系模型,并采用驱动的方式为各部件的相对运动添加动力力矩。设计了一系列的实验验证太阳翼等活动机构对月球车运动过程中遥测参数仿真的影响。实验结果表明,提出的月球车虚拟样机模型实现了符合机械运动学特征的月面行走与探测仿真,为遥操作训练提供了逼真的训练数据。
关键词:月球车;本体模型;约束关系;训练仿真;ADAMS
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2701-08
DOI: 10.16182/j.issn1004731x.joss.201611008
Design of Virtual Prototype for Lunar Rover in Training Simulation System for Teleoperation
Miao Yi, Zhou Ti
(Beijing Aerospace Control Center, Beijing 100094, China)
Abstract: To implement the requirements of training and simulation for the teleoperation of lunar rover, the methods of modeling lunar rover is studied in the simulation of virtual prototype on ADAMS, a framework was proposed for the simulation system of lunar rover, the 3D-ontology model of virtual prototype was given, the relative relations were analyzed among parts, and relatively fixed parts were partitioned by combining. The constraints relations were modeled by kinematics pair, and the dynamics moment in the motions were added for the relative moving of parts. A series of experiments were designed to validate that the simulation of telemetering parameters was affected by the activity mechanism, such as solar arrays, in the move and exploration progresses of lunar rover. The results of experiments show that the virtual prototype of lunar rover can simulate the kinematics characteristic of its movement and exploration, and give the vivid data for teleoperation training.
Keywords: lunar rover; ontology model; constraint relative; training simulation; ADAMS
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基于有限元法的平面磨削热源模型的仿真研究
王艳1,谢建华1,熊巍2,杨林1,张省1
(1.上海理工大学机械工程学院,上海 200093;2.上海理工大学材料科学与工程学院,上海 200093)
摘要:在考虑未变形磨屑厚度影响流入工件的热流密度分布的情况下,分析了现有热源模型热载荷的离散加载过程及其对数值仿真计算结果的误差影响;基于有限元法将连续性问题进行离散处理的思想,提出了不可积分函数分布热源模型的热载荷加载方法;利用新提出的热载荷加载方法,采用抛物线分布、瑞利分布的热源模型对典型磨削工况进行仿真计算,研究了热源模型对磨削温度场的影响规律。结合磨削试验温度测量值及磨削温度的理论解析式,发现有限元仿真计算结果真实可靠;证明提出的加载方法可有效解决不可积分函数分布的热源模型的热载荷加载难题,并为进一步研究磨削温度场提供理论依据。
关键词:有限元法;平面磨削;热源模型;离散加载
中图分类号:TG580????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2709-08
DOI: 10.16182/j.issn1004731x.joss.201611009
Research on Simulation of Heat Source Model Based on Finite Element Method in Surface Grinding
Wang Yan1, Xie Jianhua1, Xiong Wei2, Yang Lin1, Zhang Sheng1
(1.School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; 2.School of Materials Science and Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract: Considering the influence of cutting chip thickness on the heat flux distribution, the discrete loading method of heat source model and its effects on numerical calculation error were analyzed. A novel load method towards heat source model with a non-integral function distribution was put forward based on the discretizing idea of finite element method (FEM). On the basis of the new provided load method, simulations about typical grinding conditions were conducted using parabolic and Rayleigh distribution heat source model, to analyze the influence law of heat source model on grinding temperature field. Compared with the measured grinding temperature and its theoretical value, it can be conducted that FEM simulated result is reliable, and the proposed thermal loading method based on non-integral function distribution is a feasible way to load heat flux which has an non-integral function distribution and research grinding temperature field, which provides a theoretical basis for further study.
Keywords: finite element method; surface grinding; heat source model; discrete loading
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基于CFD仿真技术的钻井液传输数据能力分析
郑宏远1,白锐2,律水静2,刘策3
(1. 中国电子科技集团公司第三研究所,北京 100015; 2. 中国石油集团长城钻探工程有限公司钻井技术服务公司,盘锦 124000; 3. 休斯顿大学,得克萨斯 休斯顿 75835)
摘要:钻井液是石油行业无线随钻领域典型的信息传输介质。但是长久以来,缺乏对其数据携带能力影响参数的相关研究,导致很难开发出高性能的泥浆脉冲发生器。针对这个问题,以CFD流体仿真技术为工具;以油田实际井下工作环境为背景;并以井深参数为变量对水基钻井液本身的数据传输能力进行了系统的研究。最终通过仿真实验得到了1 000~6 000 m深度下的泥浆压力波传输速率与井深的可靠对应关系;通用极限速率;并总结出了压力波振幅随深度增加而产生的变化规律。整个仿真实验的结果对高速泥浆脉冲发生器的研制具有重大意义。
关键词:CFD仿真;泥浆脉冲发生器;钻井液;压力波传输速率
中图分类号:TE913????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2716-07
DOI: 10.16182/j.issn1004731x.joss.201611010
Simulative Analysis of Capacity of Transmission Data for Drilling Fluid Based on CFD
Zheng Hongyuan1, Bai Rui2, Lü Shuijing2, Liu Ce3
(1. No.3 Research Institute of China Electronics Technology Group Corporation, Beijing 100015, China;mQwag8879环亚手机|首页主页
2. The Drilling Technology Service Corporation of the Great Wall Drilling Engineering Co., Ltd of China Petroleum Corporation, Panjin 124000, China; 3. The University of Houston, Houston 75835, USA)
Abstract: Drilling fluid is a typical information transmission medium in the field of oil industry. But for a long time, the lack of relevant research on the data carrying capacity of its data results in difficult to develop high performance mud pulse generator. The CFD simulation technology as a tool; to the actual oil down-hole working environment as the background, and to the depth of the parameters for variables, water-based drilling fluid data transmission capacity were systematically researched. The corresponding relationship between the mud pressure wave transport rate and the depth of the mud at 1000~6000 m depth was obtained, generic limit rate, and the variation rule of pressure wave amplitude with the increaseing depth. The results of the whole CFD experiment have great significance to the development of high speed mud pulse generator.
Keywords: CFD simulation; mud pulser; drilling fluid; pressure wave transmission speed
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采空区处理方式与上覆既有路基沉降模拟研究
崔铁军1,2,3,马云东3,王来贵4
1.辽宁工程技术大学安全科学与工程学院,辽宁阜新 1230002.矿山热动力灾害与防治教育部重点实验室,辽宁阜新 123000;3.大连交通大学辽宁省隧道与地下结构工程技术研究中心,辽宁大连 1160284.辽宁工程技术大学力学与工程学院,辽宁阜新 123000
摘要:为避免开采对其上地表处路基沉降影响,提出直接顶板爆破、充填开采、充填开采+顶板爆破的采空区处理方案。根据规定设路基沉降限值为0.3 m,充实率为0.850.90.95引入了PFC3D爆炸模型模拟爆破,提出充填体的模拟方法,对7种方案进行模拟。模拟结果表明:火成岩4在岩层运移过程中起着抑制上覆岩层移动的作用。充填开采+顶板爆破对地面沉降的影响明显小于只使用充填开采。得到了符合沉降要求的采空区处理方案:充填开采(充实率为0.9,0.95)、充填开采+顶板爆破(充实率0.85,0.9,0.95)
关键词:采空区处理;既有路基;沉降控制;模拟研究
中图分类号:TD 324????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2723-06
DOI: 10.16182/j.issn1004731x.joss.201611011
Study on goaf treatment and settlement simulation of existing overlying highway subgrade
Cui Tiejun1,2,3, Ma Yundong3, Wang Laigui4
(1. College of Safety Science and Engineering, Liaoning Technical University, Fuxin 123000, China; 2. Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Fuxin 123000, China; 3. Tunnel & Underground Structure Engineering Center of Liaoning, Dalian Jiaotong University, Dalian 116028, China; 4. School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China)
Abstract: To avoid that mining impacts on the settlement of above highway roadbed, goaf treatment schemes were put forward, such as roof blasting, filling mining and filling mining+roof blasting. According to the rules it is set that the subgrade settlement limit is 0.3 m, and filling rate is 0.85, 0.9 and 0.95. PFC3D explosion model to simulate the blasting was introduced, 7 schemes were put forward for simulating methods of filling body, and the 7 schemes were implemented. The simulation results show that the igneous rock 4 in rock migration process has the function of inhibitting the movement of the overlying strata. The influence of filling mining + roof blasting on the land subsidence is obviously lower than using the filling mining alone. The goaf treatment schemes meeting the requirements to limit the settlement are: Filling mining (filling rate is 0.9 and 0.95), and filling mining + roof blasting (filling rate is 0.85, 0.9 and 0.95).
Keywords: goaf treatment, existing highway subgrade, settlement limit, simulation and study
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基于试验和数值仿真的封隔器卡瓦结构优化
祝效华1,晁圣棋2,刘祖林3,陈波3,唐海兵3,梁开峰3
(1.西南石油大学机电工程学院,成都 610500;2.中海油能源发展工程技术分公司钻采工程研究院,天津 300000;3.中原油田井下特种作业公司,濮阳 457162
摘要:永久式封隔器是页岩气开采过程中分段压裂的必备工具,其卡瓦结构直接影响封隔器的坐封性能。针对Y440型封隔器进行坐封、验封试验,工具在验封过程中存在下移情况,井下冲击与振动可能使工具下移加剧甚至滑脱、漏封。基于非线性显式动态分析方法,建立有限元模型,综合评估不同卡瓦牙型参数下卡瓦、套管的应力值、等效塑性应变、卡瓦滑移量。分析得出牙倾角20°、牙顶角75°、牙齿宽度8 mm、内锥角15°为相对最优的卡瓦结构该文的研究工作为封隔器卡瓦的优化设计提供了科学依据
关键词:封隔器;卡瓦;有限元分析;结构优化;模拟分析
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2729-07
DOI: 10.16182/j.issn1004731x.joss.201611012
structure optimum of packer slips based on test and numerical simulation
Zhu Xiaohua1, Chao Shengqi1,3, Liu Zulin2, Chen Bo2, Tang Haibing2, Liang Kaifeng2
(1. Mechatronic Engineering College of Southwest Petroleum University, Chengdu 610500, China; 2. Zhongyuan Oilfield Down Hole Service Company, Puyang 457162, China; 3. Engineering technology of the CNOOC energy development Company, Tianjin 300000, China)
Abstract: The permanent packer is an essential tool for segment fracturing during shale gas exploitation. The structure of the slips directly affects its setting ability. For Y440 type packer, setting and sealing tests were carried out, and the results show that the packer exists slip during sealing operation, which may exacerbates slip and even slip off under the condition of shock and vibration in a wellbore. Finite element models were established based on nonlinear explicit dynamic analysis method. According to the comprehensive evaluation on the stress value, plastic deformation and the slippage of slips with the different tooth types, the results indicate that when the teeth dip angle is 20 degrees, vertex angle is 75 degrees, teeth width is 8mm and inner cone angle is 15 degrees is the relative optimal structure. A scientific basis for the design of packer slips was provided.
Keywords: packer; slips; finite element analysis; structural optimization; simulation analysis
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支持向量回归机在颜色测温中的仿真应用
任艳,周小敏,关威,傅莉,陈新宇
(沈阳航空航天大学自动化学院,沈阳 110136)
摘要:针对工业复杂环境中高温目标温度难以直接测量的问题,提出一种新的基于支持向量回归机(Support Vector Regression, SVR)的颜色测温软测量SVR测温模型,进而预测相应的温度。仿真结果表明改进的SOR_SVR算法具有良好的泛化能力预测精度,且该算法需要的支持向量更少学习速度更快方法。利用支持向量回归机模型来拟合高温物体颜色图像样本特征值与其温度之间复杂的非线性映射关系,将待预测温度的颜色图像特征值输入到训练好的
关键词:支持向量回归机;非线性映射关系;建模仿真;温度软预测
中图分类号:TN.219????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2736-06
DOI: 10.16182/j.issn1004731x.joss.201611013
Simulation Approach to Temperature Measuring Using Image Color Based on Support Vector Regression
Ren Yan, Zhou Xiaomin, Guan Wei, Fu Li, Chen Xinyu
(School of Automation, Shenyang Aerospace University, Shenyang 110136, China)
Abstract: As it is all known, it is difficult to measure high temperature directly in complex industrial environment. Thus, a new temperature soft-measuring method based on Support Vector Regression (SVR) was proposed. SVR model was used to fit the complex nonlinear mapping relationship between the feature values of color images of the high temperature object and its temperature. And then the trained model could predict the temperature by inputting the features of colorimages. Simulation results demonstrate that the improved algorithm has excellent generalization ability and predictive ability. What’s more, this model needs less support vectors and learns faster.
Keywords: SVM regression; nonlinear relationship; modeling and simulation; temperature soft-measuring
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基于线性MMSEVolterra信道Turbo均衡算法
郭业才1,2,马伟伟2,张珊2,周润之2
(1. 南京信息工程大学 江苏省大气环境与装备技术协同创新中心,南京 210044;2. 南京信息工程大学 电子与信息工程学院,南京 210044
摘要:非线性码间干扰是影响卫星通信的重要因素之一,需要有效消除或降低这种影响。在用Volterra级数分解表示非线性信道基础上,提出了基于线性MMSE(Minimum Mean Square Error)Turbo均衡算法,以解决非线性码间干扰问题。通过对基于线性MMSETurbo均衡算法作无先验信息和低复杂度的MMSE近似处理,在不降低均衡性能的前提下,既能同时消除线性和非线性干扰,又能大大降低计算复杂度。仿真验证了该算法的有效性。
关键词:Volterra信道;最小均方误差;Turbo均衡;码间干扰
中图分类号:TN911????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2742-05
DOI: 10.16182/j.issn1004731x.joss.201611014
On Linear MMSE Based Turbo-equalization of Nonlinear Volterra Channels
guo yecai1,2, Ma Weiwei2, zhang shan2, zhou ruizhi2
(1. Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment,
Nanjing University of Information Science & Technology, Nanjing 210044, China;mQwag8879环亚手机|首页主页
?2. School of Electronic & Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China)
Abstract: Nonlinear intersymbol interference is one of the important factors affecting the satellite channel, and it is very necessary to eliminate and reduce the effect. On the basis of using the Volterra series decomposition to denote the nonlinear channel, linear Minimum Mean Square Error (MMSE) based Volterra channel turbo equalization algorithm was proposed. In this proposed algorithm, after the linear MMSE equalizer and its two approximation algorithms were derived, the proposed linear MMSE based Volterra channel turbo equalization exact and approximate algorithms could not only eliminate the linear and nonlinear intersymbol interference but also reduce the computation complexity. Simulation results show the effectiveness of the proposed algorithm.
Keywords: volterra channels; Minimum Mean Square Error(MMSE); Turbo equalization; ISI
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O2O模式下供应链失效风险识别模型及仿真
张浩,王明坤
(北京工商大学商学院,北京 100048)
摘要:电子商务O2O模式的市场规模不断扩大,如何有效防范O2O模式下供应链失效的风险,成为确保电商O2O良好运营的关键。对O2O模式下供应链失效风险的关键影响要素进行研究,并根据各影响要素之间的因果关系构建O2O模式下供应链失效风险识别的贝叶斯网络结构,运用三角模糊数方法获取贝叶斯网络条件概率值。以生鲜农产品供应链为例,构建O2O模式下供应链失效风险识别模型,并进行仿真研究。
关键词:供应链;贝叶斯网络;失效风险;三角模糊数;条件概率
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2747-09
DOI: 10.16182/j.issn1004731x.joss.201611015
Failure Risk Identification Model and Simulation of Supply Chain Under O2O E-commerce Model
Zhang Hao, Wang Mingkun
(Business School, Beijing Technology and Business University, Beijing 100048, China)
Abstract: With the expansion of Online to Offline (O2O) e-commerce market size, how to effectively prevent the occurrence of supply chain failure risk becomes the key factor to ensure O2O e-commerce market to operate well. The key influencing factors of the supply chain failure risk were analyzed and sorted. Based on causal relationship between various influencing factors, Bayesian network was constructed to analyze crucial factors. The application of triangle fuzzy number was introduced to gather value of conditional probability of Bayesian network. A case study on the failure risk identification model of fresh agricultural product supply chain under O2O model was made by using simulation software.
Keywords: supply chain; Bayesian network; failure risk; triangular fuzzy-number; conditional probability
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马尔可夫决策过程下的智能电网实时电价模型
李江波,王波,高岩,张惠珍
(上海理工大学管理学院上海 200093)
摘要:实时电价策略是节约用电、提高用户用电效用值的有效手段。提出基于马尔可夫决策过程的一个实时电价优化模型。该模型应用有限阶段方法,以供应侧和需求侧的期望效用最大化为目标,依据递减风险理论,采用对数形式对现有效用函数进行改进,从而更加准确地刻画用户用电效用。通过粒子群算法对模型求解,并与固定电价情况进行结果比较。数值模拟结果表明该模型在控制用电量和提高用电效用方面具有良好的效果,同时所得到的实时电价处于固定电价最大和最小值之间,上下波动性小。
关键词:智能电网;实时电价;马尔可夫决策过程;递减风险
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2756-08
DOI: 10.16182/j.issn1004731x.joss.201611016
Optimal Real-time Pricing Model of Smart Grid Based on Markov Decision Process
Li Jiangbo, Wang Bo, Gao Yan, Zhang Huizhen
(College of Management, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract: Real-time electricity price strategy is the effective means to save electricity and improve user electricity utility value. A real-time electricity price optimization model based on Markov Decision Process was raised. Using finite horizon method, the model structure the mathematical model which makes the expected utility maximum of supply side and demand side, and optimize the existing electricity utility function according to decreasing risk theory which using logarithmic form can describe the power utility of user more accurate. Particle Swarm Optimization was used to solve this model and make the results compare with the situation of fixed power price, the results show that this model is better than fixed power price in power saving and utility improving. Beside, the fluctuation of real-time price is between highest price and lowest price, and the fluctuation is not strong.
Keywords: smart grid; real-time electricity price; markov decision process; decreasing risk
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基于ELM的水泥立磨生料细度ADP控制
林小峰,孔伟凯
(广西大学,广西 南宁 530004
摘要:水泥生产中的立磨粉磨过程具有非线性、强耦合、大滞后等特点,对其进行精确的建模和实现生料细度的控制比较困难。提出一种基于极限学习机(ELM, extreme learning machine)的自适应动态规划(ADP, adaptive dynamic programming)优化控制算法。采用极限学习机建立立磨生料粉磨过程的生料细度预测模型,将其作为ADP算法中的模型网络,并以在线序列极限学习机实现ADP的执行网络和评价网络。结果表明:在仿真意义上,所提算法能够对生料细度进行有效地控制,对立磨稳定生产,降低该生产过程的能耗具有一定理论指导意义。
关键词:水泥立磨;生料;自适应动态规划;极限学习机
中图分类号:TP183????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2764-07
DOI: 10.16182/j.issn1004731x.joss.201611017
Adaptive Dynamic Programming in Raw Meal Fineness Control of Vertical Mill Grinding Process Based on Extreme Learning Machine
Lin Xiaofeng, Kong Weikai
(Guangxi University, Nanning 530004, China)
Abstract: The grinding process of vertical mill raw meal in cement industry features nonlinear, strong coupling and long time-delay, which is difficult to model precisely and implement stable control for raw meal fineness. Against the problem, a production index prediction model of vertical mill raw meal grinding process was established using Extreme Learning Machine (ELM). Adaptive dynamic programming (ADP) was used to control the raw meal fineness, whose action and critic networks were implemented by online sequential extreme learning machine. In the meaning of simulation, the results show that the proposed method is valid and helpful to reduce the energy consumption.
Keywords: vertical mill; raw meal; Adaptive Dynamic Programming (ADP); Extreme Learning Machine (ELM)
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矿用电机车开关磁阻电机传动系统控制策略研究
张小平1,周艳红1,张铸2
(1. 湖南科技大学海洋矿产资源探采装备与技术湖南省工程实验室,湖南 湘潭 411201;2. 湖南科技大学信息与电气工程学院,湖南 湘潭 411201)
摘要:开关磁阻电机(SRM)具有结构简单坚固、制造成本低、起动电流小、起动转矩大及可靠性高等一系列优点,适合应用于矿用电机车的电传动系统中。结合矿用电机车的工况特点,提出了基于自适应模糊PI控制的直接转矩控制策略,阐述了该控制策略的具体设计方法,并对其控制效果进行了仿真验证,同时与传统控制方法进行了对比分析,结果表明:该控制策略有效改善了SRM转矩脉动大的问题,同时较传统控制方法显着提高了系统的动态性能,因而具有较好的应用价值。
关键词:矿用电机车;开关磁阻电机;自适应模糊PI控制;直接转矩控制;仿真
中图分类号:TM46????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2771-07
DOI: 10.16182/j.issn1004731x.joss.201611018
Research on Control Strategy of Switched Reluctance Motor Drive System for Mine Electric Locomotive
Zhang Xiaoping1, Zhou Yanhong1, Zhang Zhu2
(1. Hunan Province Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Technology,mQwag8879环亚手机|首页主页
Hunan University of Science and Technology, Xiangtan 411201, China;mQwag8879环亚手机|首页主页
2. College of Information and Electrical Engineering, Hunan University of Science and Technology, Xiangtan 411201, China)
Abstract: Due to simple structure features, low cost, small starting current, large starting torque, and reliability, Switched Reluctance Motor (SRM) are very suitable for application in the mine electric locomotive electric transmission system. The basic structure and working principle of SRM were introduced, considering the working characteristics of mine electric locomotive, direct torque control strategy based on adaptive fuzzy PI control was proposed. Design method of the strategy was elaborated, after which simulation verification of control effect and comparison analysis with traditional methods were conducted. Simulation results show that, the control strategy effectively solves the problem of large torque ripple and significantly improves system dynamic performance, which is obviously valuable for application.
Keywords: mine electric locomotive; switched reluctance motor; adaptive fuzzy PI control; direct torque control; simulation
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管道通透型缺陷的超声导波检测有限元仿真
胡宏伟1,2,王泽湘1,孙广开2,彭刚1
?(1.长沙理工大学汽车与机械工程学院,长沙 410114;2.北京航空航天大学机械工程与自动化学院,北京 100191)
摘要:为获取管道缺陷与超声导波的作用规律,研究了导波在管道传播的频散特性,建立了含通透型缺陷的管道有限元模型L(0,2)和T(0,1)模态导波检测时,缺陷的周向大小与反射系数存在线性关系,通过缺陷回波位置和回波幅值能分别确定缺陷的轴向位置及周向大小,为管道导波检测的缺陷定量与定位提供了有益参考。以不同尺寸的轴向缺陷和周向缺陷为对象,采用控制变量法,通过有限元仿真研究了缺陷位置、尺寸与超声导波反射系数的关系。结果表明采用
关键词:导波检测;通透型缺陷;有限元仿真;频散特性
中图分类号:TB551????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2777-07
DOI: 10.16182/j.issn1004731x.joss.201611019
Finite Element Simulation of Ultrasonic Guided Wave to Detect Through-type Defects in Pipe
Hu Hongwei1,2, Wang Zexiang1, Sun Guangkai2, Peng Gang1
(1. College of Automobile and Mechanical Engineering, Changsha University of Science & Technology, Changsha 410114, China; 2. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China)
Abstract: To get the relationship between the defects and ultrasonic guided wave, the dispersion characteristic of guided wave in pipe was studied. Then the finite element model of a pipe with a through-type defect was established. Taking the axial and circumferential defects with different sizes as research objects, the relationship between the defect location and defect size with the ultrasonic guided wave reflection coefficients was studied, using a control variable method, by finite element simulation. The results show that there is a linear relationship between the circumferential sizes of the defect and the reflection coefficients for through-type defects when the L (0,2) and T (0,1) guided wave are used, and the axial position and circumferential size of the detect can be detected respectively by the defect echo position and amplitude values. The study provides a reference for sizing and locating of detects in pipe.
Keywords: guided wave detection; through-type defects; finite element simulation; dispersion characteristic
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点覆盖问题的近似算法研究
高文宇,李华
(广东财经大学信息学院,广州 510320
摘要:点覆盖问题是最重要的NP完全问题之一,也是近年来参数算法设计中研究得最多的问题之一。针对现有点覆盖近似算法的一些不足,基于点覆盖问题参数算法的进展,提出了该问题一个基于NT定理规约的2-近似算法。利用了参数算法中的核化技术对图进行化简,在剩余图上采用贪心策略来指导节点的选择,核化技术为算法提供了有效的近似度保障。为检验新算法性能,在不同类型的随机图上通过仿真实验比较了新算法和经典的基于匹配的2-近似算法。仿真实验结果表明新算法较基于匹配的2-近似算法有着明显的优势。
关键词:点覆盖;NP完全;近似算法;参数算法;NT定理
中图分类号:TP301.6????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2784-06
DOI: 10.16182/j.issn1004731x.joss.201611020
Research of Approximation Algorithm of Vertex Cover
Gao Wenyu, Li Hua
(School of information science, Guangdong University of Finance and Economics, Guangzhou 510320, China)
Abstract: Vertex cover is one of the most important NP complete problems, and it is also one of the most studied problems in parameterized algorithm design in recent years. According to some deficiencies of existing vertex cover approximation algorithms, a novel NT theorem based 2-approximation algorithm was proposed based on advances in parameterized algorithm. The new algorithm first used kernelization technology to reduce the origin graph, then used greedy strategy to guide the vertex selection in the remaining graph, kernelization provided effective guarantee for the approximation algorithm. In order to test the performance of the new algorithm, simulations on different types of random graph were carried to compare the new algorithm and the classical matching-based 2-approximation algorithm. Simulation results show that the new algorithm outperforms the matching-based 2-approximation algorithm.
Keywords: vertex cover; NP complete; approximation algorithm; parameterized algorithm; NT theorem
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基于测风塔测风数据的风电机组机舱风速修正
高峰1,杨锡运1,王伟1,张磊2
(1. 华北电力大学控制与计算机工程学院,北京 102206;2.大唐(赤峰)新能源有限公司,赤峰 024400)
摘要:针对机舱风速理论修正方法计算偏差较大的问题,根据风力发电机组控制策略对整个风速范围进行分区,通过高阶多项式拟合来确定机舱风速传递函数,建立一种基于测风塔测风数据的机舱风速修正方法。采用该方法进行风速修正不仅能够克服IEC机舱传递函数实用性较差的问题,而且较不分区的简单线性拟合又具有较高的拟合精度,通过引入过渡区间改进了分段机舱传递函数所存在的不连续问题。算例结果与数据分析表明了该机舱风速修正方法的优越性。
关键词:风力机;机舱风速;风速修正;机舱传递函数
中图分类号:TM614????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2790-08
DOI: 10.16182/j.issn1004731x.joss.201611021
Nacelle Wind Speed Correction of Wind Turbine Generation Units Based on Wind Speed Measured by Anemometer Tower
Gao Feng1, Yang Xiyun1, Wang Wei1, Zhang Lei2
(1. School of Control and Computer Engineering, North China Electric Power University, Beijing 102206, China;mQwag8879环亚手机|首页主页
2. Datang Corporation (Chifeng) Renewable Limited Co., Chifeng 024400, China)
Abstract: In consideration that there are great calculation errors in theoretical correction of nacelle wind speed, the entire range of wind speed was divided according to changes of control strategies for wind turbine generation unit. The nacelle transfer function (NTF) was defined by higher-order polynomial fitting to identify a method for correcting nacelle wind speed based on wind measurements of the anemometer tower. It doesn’t only overcome problems like poor practicability of IEC standards NTF, but also has higher fitting precision than simple linear fitting without intervals. By introducing intermediate intervals, the problem about discontinuous NTF in different sections has been improved. The calculation example suggest that the above method is high advantageous in correcting nacelle wind speed.
Keywords: wind turbine; nacelle wind speed; wind speed correction; nacelle transfer function
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基于曲线拟合模型的电网基波测量原理研究
刘理云1,曾喆昭2
(1. 娄底职业技术学院电子信息工程系,湖南 娄底 417000;2. 长沙理工大学电气与信息工程学院,湖南 长沙 410014)
摘要:提出了基于代数多项式模型的电网基波测量原理,其主要思想是根据递推最小二乘法(RLS)优化计算代数多项式模型参数,使代数多项式模型能高精度拟合待测的电网基波信号,然后使用最速下降法迭代计算已拟合多项式模型的零点,并根据相邻两个零点的时间差得到待测基波的频率再根据相邻两个零点之间的中点对应的拟合模型值即可获得基波的幅值;最后由第一个样本数据即可获得基波的初始相位。仿真结果表明,该测量方法不仅具有很高的基波检测精度,而且具有很强的噪声免疫能力,因而是一种行之有效的基波检测方法。
关键词:电网基波;基波检测;代数多项式;曲线拟合
中图分类号:TM935????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2798-07
DOI: 10.16182/j.issn1004731x.joss.201611022
Measuring Principle Research on Fundamental Wave of Grid Based on Curve Fitting Model
Liu Liyun1, Zeng Zhezhao2
(1. Department of Electron Information Engineer, Loudi College of Vocational & Technical, Loudi 417000, China; mQwag8879环亚手机|首页主页
2. School of Electric and Information Engineering, Changsha University of Science and Technology, Changsha 410014, China)
Abstract: Measuring principle of grid fundamental wave based on algebraic polynomial model is proposed. Its main idea is to optimize parameters of algebraic polynomial model so as to accurately fit the power grid fundamental wave signal to be measured based on the recursive least squares (RLS), and then the steepest descent method was adopted to iteratively calculate zeros of the fitting polynomial model, and then fundamental frequency was obtained according to time difference of the adjacent two zeros. Fundamental wave amplitude could be obtained according to the fitting model values corresponding to the middle of the adjacent two zero points. Finally, initial phase of the fundamental wave could be obtained by the first sample data. Simulation results show that the method proposed is an effective detection method, which has very high detection accuracy and strong noise immunity ability.
Keywords: grid fundamental wave; fundamental wave detection; algebra polynomial; curve fitting
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基于GMPHD的雷达组网检测跟踪算法研究
赵温波,丁海龙
(解放军陆军军官学院,合肥 230031
摘要:将高斯混合概率假设密度算法(Gaussian mixture probability hypothesis density algorithm,GMPHDA)成功应用于多雷达组网跟踪检测弱信噪比多目标,能估计得到所有目标状态与数量,但其跟踪结果是估计值随机集,未与各真实目标分别对应,目前未出现相关完整算法。因此提出对估计航迹进行辨识,包括航迹区分、继续、新生与恢复,给出了一整套航迹辨识算法流程,完善了多雷达组网跟踪检测目标算法。仿真结果表明,能跟踪检测到弱信噪比环境下所有目标,提出的航迹辨识算法能够形成与各真实目标一一对应、逼近的航迹。
关键词:航迹辨识;高斯混合概率假设密度滤波;概率假设密度滤波;多雷达组网
中图分类号:TN953????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2804-09
DOI: 10.16182/j.issn1004731x.joss.201611023
Study on Track and Detect Algorithm in Radar Networking Based on GMPHD
Zhao Wenbo, Ding Hailong
(Amy Officer Academy of PLA, Hefei 230031, China)
Abstract: The states and number of WSNR multi-target are tracked accurately by Gaussian mixture probability hypothesis density algorithm (GMPHDA) application. But tracking result is random set of target states, it doesn't correspond one to one with real targets. And the complete algorithm about corresponding has not been proposed. To get target tracks corresponding with real targets, a suite of algorithm about identifying target tracks is proposed, called track identification algorithm, which contains track distinction, continuance, newborn and restoration. The track identification algorithm improves track and detect algorithm in multi-radar networking. Simulation results show that WSNR multi-target is tracked in multi-radar networking, which gets target tracks corresponding one to one with real targets by the proposed identification algorithm.
Keywords: track identification; Gaussian mixture probability hypothesis density filter; probability hypothesis density filter; multi-radar networking
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基于神经网络逆控制的微网储能逆变器输出电压研究
刘卫亮,林永君,刘长良,陈文颖,马良玉
(华北电力大学自动化系,保定 071003)
摘要:为改善微网中储能逆变器的输出电压波形质量,提出了一种基于神经网络的逆模型控制方法。建立了储能逆变器的数学模型,分析了影响其输出电压的主要因素,利用前向神经网络建立了系统的扩展逆模型;针对BP训练算法容易陷入局部最优的问题,通过万有引力算法进行了网络初始参数优化;将神经网络逆模型与原模型串联后,采用PI控制器实施闭环控制。仿真结果表明,该方法可以有效的提高储能逆变器的动态响应速度,并降低输出电压的谐波含量。制作了10 kW储能逆变器样机进行试验,结果表明了所提方法的可行性与有效性。
关键词:储能逆变器;逆模型;神经网络;谐波含量
中图分类号:TM85????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2813-10
DOI: 10.16182/j.issn1004731x.joss.201611024
Neural Network Inverse Control for the Output Voltage of Energy Storage Inverter in Micro-grid
Liu Weiliang, Lin Yongjun, Liu Changliang, Chen Wenying, Ma Liangyu
(Automation Department of North China Electric Power University, Baoding 071003, China)
Abstract: In order to improve the output voltage waveform quality of energy storage inverter in micro-grid, an inverse control method was proposed based on BP neural network. Mathematical model of the energy storage inverter was established, and the main factors affecting the output voltage were analyzed, and then the expansion inverse model of the system was established based on BP neural network. In order to overcome the local optimum disadvantage in BP training algorithm, gravity algorithm was adopted to optimize the network initial parameters. The neural network inverse model was put in series with its original model to form a pseudo linear system, and then PI controller was selected to perform the single loop control. The simulation results show that the proposed control method can effectively improve the dynamic response speed of the inverter output voltage and reduce the harmonic content. Experiment is performed on 10 kW inverter prototype, which proves the proposed method feasibility and effectiveness.
Keywords: energy storage inverter; inverse model; neural network; harmonic content
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改进粒子滤波和小波包在汽轮机振动诊断中的应用
夏飞1,2,郝硕涛2,3,张浩1,2,彭道刚2,3
(1. 同济大学电子与信息工程学院,上海 201804;2. 上海电力学院自动化工程学院,上海 200090;mQwag8879环亚手机|首页主页
3. 上海发电过程智能管控工程技术研究中心,上海 200090
摘要:提出了一种改进粒子滤波和小波包分析相结合的汽轮机振动故障诊断方法。针对传统粒子滤波的样本退化问题,在重采样阶段提出了一种权值排序和优胜劣汰的改进粒子滤波算法。采用小波包分析的方法进行特征提取,利用SVM得到故障诊断结果。由结果可知,降噪信号的故障识别率明显高于原始信号的故障识别率。无论哪种信号,采用小波包分析提取特征向量进行故障诊断的识别率要高于采用FFT分析得到特征向量进行故障诊断的识别率,证明了本文提出方法的优越性。
关键词:改进粒子滤波;权值排序;优胜劣汰;小波包分析;振动故障诊断
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2823-09
DOI: 10.16182/j.issn1004731x.joss.201611025
Application of Improved Particle Filter and Wavelet Packet in Turbine Vibration Diagnosis
Xia Fei1,2, Hao Shuotao2,3, Zhang Hao1,2, Peng Daogang2,3
(1. School of Electronic and Information, Tongji University, Shanghai 201804, China; 2. College of Automation Engineering,Shanghai University of Electric Power, Shanghai 200090, China; 3. Shanghai Engineering Research Center of Intelligent Management and Control for Power Process, Shanghai 200090, China)
Abstract: A fault diagnosis method of improved particle filter and wavelet packet analysis was proposed in the application of turbine vibration.There was a sample degradation problem in the re-sampling stage of traditional particle filter. And a re-sampling algorithm which was a weight sorting and the survival of the fittest to obtain the improved particle filter was studied. The signal was filtered by the improved particle filter. Then wavelet packet analysis was used to extract the features from the noise reduction signal. Finally the fault diagnosis results were obtained by using SVM. It is shown that the fault identification rate of the noise reduction signal is significantly higher than that of original signal. No matter which kinds of signal are, the recognition rate of fault diagnosis using wavelet packet analysis is higher than that of FFT analysis. It shows the superiority of the improved particle filter and wavelet packet analysis in the stream vibration fault diagnosis.
Keywords: improved particle filter; weight sorting; survival of the fittest; wavelet packet analysis; fault diagnosis of vibration
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一种用于圆环形传感器阵列的宽带波束形成方法
甘甜
(西安石油大学电子工程学院,西安 710065)
摘要:基于模态分解思想的波束形成是一种很好的圆环形波束形成方法,为了将其运用到宽带波束形成中,提出了一种逼近期望波束的抗白噪声的稳健宽带波束形成算法。该方法利用模态分解方法设计出模态域的稳健模态系数,根据在不同模态阶数下生成不同波束的情况下,利用二阶锥优化算法在宽带波束性能指标之间获得比阵元域稳健性方法更合理的折衷,从而为设计者根据对波束性能指标需求提供了选择的平台和操作的空间。计算机仿真验证了该方法可以实现我们期望得到的恒定束宽波束图,并且比传统的二阶锥恒定束宽方法有更好的效果。实验也验证了该方法的可行性。
关键词:模态分解;圆环阵;宽带波束形成;稳健性;二阶锥规划
中图分类号:TP391.9????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2832-09
DOI: 10.16182/j.issn1004731x.joss.201611026
Broadband Beamforming Method for Circular Sensor Array
Gan Tian
(School of Electronic Engineering Xian Shi You University, Xi’an 710065, China)
Abstract: The beamforming method based on mode decomposition is a kind of very good beamforming method for circular sensor arrays, in order to apply it to the broadband beamforming, An against white noise robust beamforming method was proposed to design an expect beam. The method designed the modal domain robust modal coefficient using the model decomposition method to generate different beam under the different mode circumstances, using second-order cone optimization algorithm gain more reasonable compromise than the other methods in the broadband beam performance, The platform of choice and operation of space were provided according to the demand for beam performance indicators for the designers. Computer simulation shows that this method can realize constant beamwidth beam figure, and has a better effect than traditional second-order cone constant beamwidth method.Experiments also verify the feasibility of this method.
Keywords: modal decomposition; circular sensor array; broadband beam forming; robustness; second-order cone optimization
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一种融合文本语义和情感分析的好友推荐方法
刘群,孙红涛,纪良浩
(重庆邮电大学重庆市计算智能重点实验室,重庆 400065
摘要:在现实生活中用户的兴趣和情绪波动很大,而其他的微博特征(如注册信息等)一般变动较少,不能很好地表征用户。提出了一种融合用户文本语义和情感分析的好友推荐方法,根据用户的微博文本内容提取出语义特征,通过语义分析技术来计算特征词的相似度,同时引入了时间因素。在获得语义特征相似的用户之后,又进一步考虑用户的情感特征,根据微博文本中表述用户情感的词汇对用户的情感特点进行分析,进而对上一步产生的结果做优化筛选,得出最终的结果。通过实验表明,加入文本语义和情感分析的好友推荐模型更能够有效地提高推荐的准确度和接受率。
关键词:微博;文本语义;情感分析;相似度;好友推荐
中图分类号:TP391.3????? 文献标识码:A??? ???文章编号:1004-731X (2016) 11-2852-08
DOI: 10.16182/j.issn1004731x.joss.201611028
Friend Recommendation Based on Analysis of Users’ Emotions and Text Semantics
Liu Qun, Sun Hongtao, Ji Lianghao
(Chongqing Key Laboratory of Computational Intelligence, Chongqing University of Posts and Telecommunications, Chongqing 400065, China)
Abstract: The interests and emotions of users are often varied in their real lives. On the contrary, some other features (such as the profiles) of micro-blog are always unchangeable and they cannot describe the users’ characteristics very well. Then a novel friend recommendation method merged users’ text semantics with emotions was proposed. In the model, in order to compute the similarity of friends, some text content features from users’ micro-blog are extracted and time factor was introduced. Then further consideration on the users' emotional characteristics was taken to compute the users’ similarity through analyzing the emotional words in micro-blog text. Then the final results were gotten. The results of the experiments show that the model can effectively enhance the accuracy and rationality of friend recommendation by adding text semantics and emotions analysis.
Keywords: micro-blog; text semantic; emotional analysis; similarity; friend recommendation
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基于上下文语境传播的多媒体语义标注改善
田枫,尚福华
(东北石油大学计算机与信息技术学院,大庆 163318;)
摘要:提出了一种数据驱动的多媒体对象标注改善方法,利用数据集蕴含的丰富语境相关信息对基本多媒体对象标注结果进行优化。以标签为节点,相关度为边,构造标签语境相关图,实现概念空间上的相关性传播;将多媒体对象内容特征和文本模态特征互增强过程集成为一个优化框架,通过近似求解策略,实现上下文语境信息传播。该方法充分利用了标签的上下文相关性和多媒体对象的内容相关性。数据集上的实验结果表明,该方法可大幅度提升标注性能。
关键词:多媒体标注;语义标注;语义改善;语境传播
中图分类号:TP391????? 文献标识码:A?????? 文章编号:1004-731X (2016) 11-2860-08
DOI: 10.16182/j.issn1004731x.joss.201611029
Multimedia Annotation Refinement Based on Contextual Information Diffusion
Tian Feng, Shang Fuhua
(School of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China)
Abstract: A data driven multimedia annotation refinement method based on dataset contextual information diffusion was proposed. The label contextual graph was constructed, and the label correlation can be diffused on textual label space; Multimedia object content relevant graph was constructed. Label contextual graph and multimedia object content relevant graph were mutually reinforced and formulated into a regularized framework. The proposed method incorporated both multimedia content correlation and label contextual information, and the optimization process was solved by approximate solution algorithm. The experimental results on real world dataset show that the proposed method can obviously improve the annotation performance.
Keywords: multimedia annotation; semantic annotation; annotation refinement; contextual diffusion
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基于场论的微信信息传播机制及其仿真研究
单晓红,贾盼盼,刘晓燕
(北京工业大学经济与管理学院,北京 100124)
摘要:微信网络作为时下流行的社交网络平台,快速地影响着人们的生活方式。通过分析影响微信信息传播的因素,构建三维坐标建立微信信息传播场,结合场论的理论方法建立信息传播模型,利用Netlogo仿真平台从影响信息传播的因素、初始信源用户比例以及不同微信网络结构三个角度对微信用户信息传播过程进行模拟,结果表明用户属性特征比较类似时,传播过程的效果较好;微信网络结构的连通性较好时,信息传播的路径较广,渠道较多;信息传播过程中所需的信息势差较小时,信息传播的效果较好。这一结果对于企业在营销过程中准确定位客户具有重要意义。
关键词:微信网络;信息传播;场论;Netlogo仿真
中图分类号:TP391??? ???文献标识码:A?????? 文章编号:1004-731X (2016) 11-2867-11
DOI: 10.16182/j.issn1004731x.joss.201611030
WeChat Information Dissemination Mechanism and Simulation ResearchmQwag8879环亚手机|首页主页
Based on Field Theory
Shan Xiaohong, Jia Panpan, Liu Xiaoyan
(Beijing University of Technology, School of Economics and Management, Beijing 100124, China)
Abstract: As the popular social networking platform, the wechat network has the rapid impact on people's way of life. By analyzing the factors that influence the information dissemination among wechat, constructing the wechat information diffusion field by building three-dimensional coordinate, the information diffusion model was established based on the field theory. The process of information dissemination was simulated from three angles by using Netlogo simulation platform, that is the factors affecting the information dissemination, the original proportion of information source users, and different wechat network structures. Simulation results show that the more similar characteristics of the user, the dissemination results can be better; when connectivity to wechat network structure is better, the wider the path of information dissemination is, more channels; when the information potential difference is small, information dissemination is better. The results are important for companies to accurate positioning customer in the marketing process.
Keywords: wechat network; information dissemination; field theory; netlogo simulation
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