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2017年第4期

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于淼1,2,尚伟鹏1,2,卢宁1,2
(1. 北京建筑大学机电与车辆工程学院,北京 1000442. 城市轨道交通车辆服役性能保障北京市重点实验室,北京 100044)
摘要:区域间弱阻尼低频振荡是影响电网安全稳定运行的关键问题。目前广域直流和发电机控制的实施已成为提高电网区域间低频振荡阻尼的重要手段之一,但是在发电机、HVDCFACTS等装置控制器之间的协调方面还需进一步的深入研究。提出直接神经动态规划方法在电力系统稳定控制中的应用结构,基于一般超前-滞后环节的移相式神经网络形式,将直接神经动态规划方法嵌入到传统的电力系统稳定控制器中。将上述提出的方法应用到典型电网结构以及南方电网中实现了控制器的协调设计。仿真结果表明使用该方法进行控制器协调设计后,可以实现很好的协调控制效果。
关键词:低频振荡;直接神经动态规划;移相式神经网络;协调控制;电力系统稳定
中图分类号:TM712????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0699-09
DOI: 10.16182/j.issn1004731x.joss.201704001
Coordinated Control of Power System Based on Direct Neural Dynamic Programming Method
Yu Miao1,2, Shang Weipeng1,2, Lu Ning1,2
(1. School of Mechanical-electronic and Automobile Engineering, Beijing University of Civil Engineering and Architecture,Beijing 100044,China; 2. Beijing Key Laboratory of Service Performance of Urban Rail Transit Vehicles, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.)
Abstract:Inter-area low frequency oscillation with weak damping is a key issue affecting the security and stability operation of power grid. Currently, the implementation of wide-area DC and generator control has become one of the important means to improve inter-area low frequency oscillation damping. But the coordination among the controllers of generator, HVDC and FACTS needs to further studying. The application structure of direct neural dynamic programming method in power system stability control was proposed, and based on phase-shift neural network of general lead-lag link, the proposed method was embedded in the traditional power system stability controller. It was applied to a typical grid structure as well as in the South China power grid to achieve a coordinated controller design. Simulation results show that this method can realize the coordinated controller design, and the coordinated control effect is very good.
Keywords: low frequency oscillation; direct neural dynamic programming; phase-shift neural network; coordinated control; power system stability
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多机器人欠约束绳牵引系统静平衡工作空间分析
赵志刚,李巍,李有德,王砚麟,马延
(兰州交通大学机电工程学院,兰州 730070)
摘要:由于多机器人绳牵引负载的欠约束系统,不满足力封闭条件,同时方程组一般不相容,无法求出准确的工作空间。建立了系统的静平衡方程,提出利用最小二乘法原理结合蒙特?卡罗方法,对负载低速或准静态运动时,能够快速求出其近似静平衡工作空间,并分别利用法方程和QR分解给出了绳拉力的表达式。在机器人的位置和负载的位姿不发生力旋量失效的情况下,其有唯一的最小二乘解。通过仿真验证了该方法的有效性,利用该方法可快捷地求出不同空间构型的欠约束绳牵引系统的静平衡工作空间,为系统规划与控制的研究提供了基础。
关键词:欠约束;静平衡;工作空间;仿真
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0708-06
DOI: 10.16182/j.issn1004731x.joss.201704002
Analysis of Static Equilibrium Workspace for Under-constrainted Cable-driven System with Multi-robots
Zhao Zhigang, Li Wei, Li Youde, Wang Yanlin, Ma Yan
(School of Mechatronic Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China)
Abstract: For the under-constrainted system that multi-robots tow the payload by cables, which does not meet the condition of force closure and equations are generally not compatible, so the accurate workspace can't be found out. The static equilibrium equation of the system was established, and then the least squares principle combined with the Monte-Carlo method was put forward. When the movement is low speed or quasi static for the payload, the approximate static equilibrium workspace can be found out quickly and the expression of the cable tension is given by using the normal equations and QR decomposition respectively. When position of robots and position and pose of the payload happen that the wrench isn't failed, there is the unique least square solution.The effectiveness of the proposed method was validated by computer simulation, the method can be used to quickly find out static equilibrium workspace of the under-constrainted cable-driven system for different space configuration, which provides the foundation to the research of planning and control for the system.
Keywords: under-constrainted; static equilibrium; workspace; simulation
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基于势能网格的人群流动模型及其在渠化效应中的应用
方乐1,金雪夫1,王思远1,王颖2
1. 北京航空航天大学中法工程师学院北京 1001912. 北京航空航天大学交通科学与工程学院 北京 100191)
摘要:将宏观流体力学模型中的一些特性和微观社会力模型的部分特征融合起来,利用Dijkstra算法建立覆盖全场的势函数分布,进而建立了一种新的人群流动模型,利用光滑粒子流体动力学的思想指导运动过程,使得模拟的过程兼具宏观和微观特性。该模型在模拟某音乐厅散场算例中得到了验证,也成功重现了渠化效应现象。针对渠化效应这一典型的人群流动自组织现象提出了渠化效率这一概念,分析了它的变化特性与影响因素,为今后进一步的定量理论研究提供了工具。
关键词:人群流动模拟;势函数;光滑粒子流体动力学;渠化效应;渠化效率
中图分类号:U121,TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0714-09
DOI: 10.16182/j.issn1004731x.joss.201704003
Pedestrian Flow Simulation Model Based on Potential Grid and Its Application to Lane Formation Phenomenon
Fang Le1, Jin Xuefu1, Wang Siyuan1, Wang Ying2
(1. Sino-French Engineering School, Beihang University, Beijing 100191, China; 2. Transportation Science and Engineering Department, Beihang University, Beijing 100191, China)
Abstract: By combining macro characteristics in fluid mechanics model and micro characteristics in social force model together, and using Dijkstra algorithm to establish a potential function covering the whole field of simulation, with the guidance of Smoothed Particle Hydrodynamics, a new model was created in order to keep both macroscopic and microscopic characteristics during the process of simulation.This new model was verified by evacuation simulation in a music hall. Using this model, lane formation phenomena was reproduced. The definition of lane formation ratio makes it possible to analyze variations and causes of this typical self-organization phenomena, providing us with new tools for quantitative pedestrian simulation studies.
Keywords: pedestrian flow simulation; potential function; SPH; lane formation phenomenon; lane formation ratio
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钱立林1,陶建武1,杨越明2,虞飞1
(1. 空军航空大学 飞行器控制系,长春 130022;2. 空军航空大学 航空理论系,长春 130022)
摘要:利用安装在机翼前缘的声矢量传感器,给出了一种新型大气参数的估计方法。基于声矢量传感器敏感翼部绕流分布,建立大气参数求解模型。根据机翼后掠、对称的特点,对速度矢量进行分解来对模型的非线性方程进行解耦,从而求解了侧滑角、攻角和自由流速度的表达式。通过Fluent对机翼绕流进行仿真,验证了方法的可行性。
关键词:机翼前缘;气流速度;大气参数;Fluent;流分离
中图分类号:V119; TP331????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0723-07
DOI: 10.16182/j.issn1004731x.joss.201704004
Estimation of Atmospheric Parameter Based on Airflow Velocity Over Wing Leading Edge
Qian Lilin 1, Tao Jianwu 1, Yang Yueming2, Yu Fei1
(1. Department of Flight Vehicle Control, Aviation University of Air Force, Changchun 130022, China; 2. Department of Aviation Theory, Aviation University of Air Force, Changchun 130022, China)
Abstract: A new method measuring the atmospheric parameters was proposed based on acoustic vector sensors located at the wing leading edge, and the atmospheric parameters model was set up based on the airflow velocity distribution sensed by acoustic vector sensor over wing leading edge. According to the symmetric, swept character of wings, velocity vector was decomposed to solve the non-linear equation of model. The expressions of angle of sideslip, angle of attack and free stream velocity were derived. The feasibility of the expressions was verified by wing simulation data from Fluent.
Keywords: wing leading edge; airflow velocity; atmospheric parameters; Fluent; flow separation
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传送带给料分批加工系统在线优化控制方法
吴松,唐昊,谭琦
(合肥工业大学电气与自动化工程学院,安徽 合肥 230009)
摘要:传送带给料分批加工系统中,工件动态到达,并配置有存放待加工工件的缓冲区,其加工主体为批处理设备。考虑工件属性差异,重点研究单机模型的在线优化控制问题。以前视距离为控制变量,无穷时段内的工件处理率最大为优化目标,建立了系统的优化模型。针对该模型中的工件分批决策,提出一种以批处理机加工周期内加工能力浪费比最小为准则的工件分批规则。对于该模型中的行动选择决策,文中引入Q学习优化算法,以求解最优前视控制策略。通过仿真实验,对算法的有效性进行了验证,并分析了不同分批策略及参数对系统性能的影响。
关键词:批处理;差异工件;单机;在线优化
中图分类号:TP202???????? 文献标识码:A???????? 文章编号:1004-731X (2017) 04-0730-10
DOI: 10.16182/j.issn1004731x.joss.201704005
Online Optimal Control Method of Conveyor-serviced Batch Processing System
Wu Song, Tang Hao, Tan Qi
(School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China)
Abstract: In conveyor-serviced batch processing system, jobs arrive dynamically and are stored in a buffer to be further processed by the batch processing machine. Under the cases of non-identical job sizes, online optimal control of the system with a single machine was mainly concerned. Optimization model of the system was built by using look-ahead range as control variable. The objective is to maximize the job processing rate of the system in infinite horizon. Two decision processes are included in the model, which are batching process and action-selection process. For the batching process, the rule of minimizing process-capacity wasting ratio of the machine during production period was proposed. And for the action-selection process, Q-learning algorithm was employed to derive the optimal look-ahead policy. The effectiveness of the proposed algorithms was demonstrated through the simulation experiments. Besides, the influence of some batching rules and physical parameters on system performance was showed.
Keywords: batch processing; attribute-different jobs; single machine; online optimization
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NCS新型离散事件触发通讯与少保守性鲁棒H容错协同设计
李炜,翟鹏飞,李亚洁
(兰州理工大学电气工程与信息工程学院,甘肃 兰州 730050)
摘要:针对现有网络化控制系统(networked control systemsNCS)依赖网络固有资源进行容错控制设计方法的局限性,以及多性能指标约束下控制器设计的保守性问题,分析了现有离散事件触发通讯机制对系统性能负面影响,提出了一种具有动稳过程协调约束的离散事件触发通讯机制,并在该机制下建立了闭环故障模型,并结合改进的Wirtinger不等式与改进的互反凸组合引理等技术,获得了NCS的新型离散事件触发通讯机制与鲁棒H容错控制的协同设计方法;最后以仿真算例验证了本文方法在确保系统性能、节约网络通讯资源与减少控制器保守性方面的优越性。文中触发条件的设计物理意义明确,触发参数便于选取,动稳兼顾的属性在确保系统性能的前提下能更有效地节约网络通讯资源。
关键词:网络化控制系统;离散事件触发通讯机制;H容错控制;协同设计
中图分类号:TP302.8????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0740-12
DOI: 10.16182/j.issn1004731x.joss.201704006
Co-design Between New Event-triggered Communication Scheme and Less Conservative Robust H Fault-tolerant Control for Networked Control Systems
(College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China)
Abstract: Based on the analysis for the disadvantage of the current discrete event-triggered communication schemes, a new kind of event-triggered communication scheme constrained by transient and stead-state process was proposed to perfect the conservatism and isolation of the fault-tolerant controller. A closed-loop failure model which was concerned with state-error was established for networked control system. Using the improved Wirtinger’s inequality and the improved reciprocally convex combination inequality, the co-design between new event-triggered communication scheme and less conservative robust H fault-tolerant control for networked control systems was focused on. The simulation results show that the new discrete event-triggered communication scheme can save more network communication resource without deteriorating the system performance excessively. At the same time, the controller has less conservatism and becomes more easily to acquire. The triggering condition designed has a definite physical meaning and parameters are more likely to choose.
Keywords: networked control system; new event-triggered communication scheme; H fault-tolerant control; co-design
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高压直流输电系统三相动态相量建模与仿真
赵云灏,刘崇茹,李庚银,贠飞龙
(华北电力大学(新能源电力系统国家重点实验室),北京 102206)
摘要:建立了高压直流输电(HVDC)系统的三相动态相量模型,能快速反映交流系统对称与不对称运行情况下HVDC系统的动态特性。建模过程中,通过分析换流器的开关和换相过程,修正了换流器的开关函数模型;根据直流系统频率特性,使用动态向量理论建立含换流器、直流线路和控制系统的完整的HVDC三相动态相量模型。将HVDC系统三相动态相量模型和电磁暂态模型仿真结果比较,验证了HVDC系统三相动态相量模型的正确性和有效性。
关键词:建模;高压直流输电;动态相量;开关函数
中图分类号:TM743????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0752-09
DOI: 10.16182/j.issn1004731x.joss.201704007
Modeling and Simulation of HVDC Systems by Three-Phase Dynamic Phasor
ZhaoYunhao, Liu Chongru, Li Gengyin, Yun Feilong
(North China Electric Power University (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources), Changping District, Beijing 102206, China)
Abstract: A three-phase dynamic phasor (TPDP) model of High Voltage Direct Current (HVDC) systems was proposed. The proposed model could rapidly solve the dynamic characteristics of HVDC systems for AC system symmetrical and asymmetrical operating conditions. Switch functions model of converter was enhanced according to commutation process analysis of the converter. Due to the frequency characteristics analysis results, the TPDP model of HVDC systems with the converter, DC line and controller were established through dynamic phasor theory. Simulation results show that the proposed model is effective and acceptable..
Keywords: modeling; HVDC; dynamic phase; switch functions
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基于多分辨率奇异熵的混凝土缺陷检测
赵迪,徐志胜
(中南大学防灾科学与安全技术研究所,长沙 410075)
摘要:针对超声波检测信号存在衰减大、指向性差、传播路径复杂,以及构成复杂的特点,提出一种基于多分辨率奇异熵的混凝土缺陷智能无损检测算法。该算法利用小波算法,将超声波信号分解为多个尺度下的高、低频分量,针对各个分量进行奇异谱分解,同时利用信息熵理论,计算奇异熵作为缺陷检测的特征值,利用GA-SVM算法对奇异熵进行训练,从而达到辨识混凝土缺陷的目的。仿真实验结果表明表明采用该方法能够有效的提升混凝土缺陷辨识的精确度,提供了一种新的辨识混凝土缺陷的有效途径。
关键词:小波变换;奇异谱分析;信息熵;遗传算法;支持向量机
中图分类号:TP273?????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0761-06
DOI: 10.16182/j.issn1004731x.joss.201704008
Forestry Fire Spatial Diffusion Model Based on Integration of Multi-Agent Algorithm with Cellular Automata
Zhao Di, Xu Zhisheng
(Institute of Disaster Prevention Science and Safety Technology, Central South University, Changsha 410075, China)
Abstract: In view of the existing ultrasonic detection signal attenuation, directional difference, complex propagation paths, and characteristics of the components of complex, a kind of intelligent concrete defect nondestructive detection algorithm based on multi resolution singular entropy was put forward. By using the wavelet algorithm, the ultrasonic signal was decomposed into high, low frequency components of multi scales for each component, then each component was decomposed by singular spectrum analysis, at the same time using the information entropy theory, the calculation of singular entropy as the characteristic defect detection value, using the GA-SVM algorithm was used to train the singular entropy, so as to achieve the purpose of identification of defects in concrete. The simulation results show that the proposed method can effectively improve the accuracy of the identification of the defects, and it can provide a new effective way to identify the defects of the concrete.
Keywords: Wavelet; SSA; Entropy of information; GA; SVM
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生化恐怖袭击下行人应急引导疏散仿真研究
隋杰,龙圣杰
(中国科学院大学工程科学学院,北京 100049)
摘要:地铁站厅等公共场所具有人员密集、空间封闭、地形环境复杂的特点,发生生化恐怖袭击时极易造成大量的人员伤亡。针对生化恐怖袭击时的地铁站厅应急疏散中存在的问题,在疏散时间经验公式基础上结合行人逃生规则制定引导方案对行人进行引导疏散。并分析不同特征的行人在生化恐怖袭击中行为差异,以及对引导疏散过程的影响。通过基于社会力开发的仿真模型模拟各种场景下的疏散过程,指出应急引导疏散方案制定中环境因素及行人行为特征的重要性。
关键词:生化恐怖袭击;应急引导;行人逃生规则;行人特征;仿真
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0767-09
DOI: 10.16182/j.issn1004731x.joss.201704009
Research on Simulation of Emergency Evacuation Guidance under Biochemical Terror Attacks
Sui Jie, Long Shengjie
(University of Chinese Academy of Sciences, College of Engineering and Sciences, Beijing 100049, China)
Abstract: Biochemical terror attacks can cause numerous casualties, especially when it happens in public places such as subway station, which is densely populated, sealed, and complex in topography. And evacuating guidance plays an important role in reducing casualties. A guidance scheme was established based on both evacuating empirical formula and passengers escaping rules, according to evacuation problems in subway station. Meanwhile, the different features of passengers and their behaviors under attack were analyzed, as well as their impacts on evacuation. By simulating various evacuation situations based on social force simulation model, the importance of environmental features and passengers features in making evacuation guidance was indicated.
Keywords: biochemical terrorist attack; evacuating guide; escaping rules; passengers features; simulation
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超声剪切波成像对肝脏裂伤的仿真检测
玉姣1,聂二伟2,朱艳英1
(1. 辽宁石油化工大学理学院,抚顺 113001;2. 辽宁石油化工大学信息与控制工程学院,抚顺 113001)
摘要:超声剪切波成像技术通过检测剪切波传播实现对软组织的弹性测量。探索使用超声剪切波成像技术结合方向滤波算法实现对肝脏裂伤检测的可行性。通过COMSOL Multiphysics软件仿真剪切波的产生和在有裂伤肝脏内部的传播,用方向滤波分离入射波和破裂处反射波,并用边缘检测算法对裂伤进行定位和边缘检测。结果显示方向滤波和边缘检测算法能够检测肝裂伤位置和迎向入射波一侧边缘,误差<1%超声剪切波成像结合方向滤波技术可以避免弹性重构中对逆问题的求解,对于超声信噪比低的情况和作为辅助影像学工具提高钝性肝脏外伤的超声诊断灵敏性方面具有应用潜力。
关键词:超声剪切波;肝脏裂伤;仿真;检测
中图分类号:TN911.7????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0775-09
DOI: 10.16182/j.issn1004731x.joss.201704010
Simulation of Ultrasonic Shear Wave Imaging in Detection of Liver Rupture
Yu Jiao1, Nie Erwei2, Zhu Yanying1
(1. College of Science, Liaoning Shihua University, Fushun 113001, China; 2. College of Information and Control Engineering, Liaoning Shihua University, Fushun 113001, China)
Abstract: Ultrasonic shear wave imaging technology provides the elastic information of the soft tissue by examining the propagation of the shear waves in the tissue. The possibility of using ultrasonic shear wave imaging technology combined with a directional filter for the detection of liver rupture was explored. The COMSOL Multiphysics software was used to simulate the generation and propagation of the shear waves in the liver medium with a rupture, a directional filter-based algorithm was applied to separate the incident wave and reflected wave, and an edge detection algorithm was applied to detect and delineate the liver rupture. Preliminary results indicate that a directional filter and edge detection algorithm could detect and delineate the front edge of the rupture, with an error less than 1%. The ultrasonic shear wave imaging combined with a directional filter approach makes up for the shortcomings of solving the inversion problem to reconstruct the elasticity map, and holds promises for the low ultrasonic SNR (Signal Noise Ratio) case and for improving the sensitivity of ultrasonic diagnosis of blunt liver trauma as a valuable assistive imaging tool for clinical practice.
Keywords: ultrasonic shear wave; liver rupture; simulation; detection
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单相PWM整流器分数阶建模与仿真分析
郑征,马方军,韦延方
(河南理工大学电气工程与自动化学院,焦作 454000)
摘要:基于实际电容和实际电感在本质上是分数阶的事实,针对单相PWM整流器建模问题进行研究。在分析分数阶Caputo定义建模方法和PWM整流器拓扑结构的基础上,实现采用分数阶微积分理论建立单相PWM整流器的分数阶数学模型。基于瞬时功率理论,针对直流侧电容电压直流分量大小、交流分量峰峰值大小、动态响应时间分析。理论上讲,直流分量大小不随电容阶数变化,而交流分量峰峰值大小则相反,动态响应时间随着电容阶数变小而响应速度变快。建立了单相PWM整流器分数阶模型的Matlab/Simulink仿真模型,仿真结果验证了分数阶建模与理论分析的有效性。
关键词:分数阶微积分;PWM整流器;Caputo定义建模;瞬时功率理论
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0784-07
DOI: 10.16182/j.issn1004731x.joss.201704011
Fractional Modeling and Simulation Analysis of Single-Phase PWM Rectifier
Zheng Zheng, Ma Fangjun, Wei Yanfang
(School of Electrical Engineering and Automation, Henan Polytechnic University, Jiaozuo 454000, China)
Abstract: The modeling problem of single-phase PWM rectifier was studied, based on the fact that actual capacitance and inductance is the fractional in nature. The mathematical model of single-phase PWM rectifier was established by using fractional calculus theory, based on modeling method analysis of fractional Caputo definition and PWM rectifier topology. According to instantaneous power theory, for DC component value, the peak to peak value AC component, and the time of dynamic response of the DC side capacitor voltage were analyzed. In theory, DC component value does not change with the order number capacitance, while the AC component is opposite, dynamic response time will be smaller and faster response speed by the capacitance order. A Matlab/Simulink simulation model of a single-phase PWM rectifier fractional model was established, and then simulation results verify the fractional modeling effectiveness and theoretical analysis.
Keywords: fractional calculus; PWM rectifier; Caputo definition of modeling; the theory of instantaneous power
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基于布谷鸟差分算法优化的DV-Hop改进算法
刘登峰1,章力2,邴晓瑛1,邵玉倩1,徐保国1
(1. 江南大学轻工过程先进控制教育部重点实验室,江苏 无锡 214122;2. 展讯通信(上海)有限公司,上海 201203)
摘要:经典DV-Hop定位算法中,三边测量法虽然避免了迭代运算,但对信标节点的依赖性较大;而极大似然估计法存在对误差进行累加的问题。针对传统定位算法存在的问题,提出了基于布谷鸟(CS)差分(DE)优化的DV-Hop改进算法,将定位问题转化为群体优化问题,利用CSDE算法进行双种群并行搜索,动态调整CS中宿主发现入侵者的概率参数,随机缩放DE算法中变异因子,增强全局搜索能力,规避了距离误差在定位过程中的累加,有效提高了定位精度。
关键词:DV-Hop定位;布谷鸟优化;差分优化;WSN
中图分类号:TP393????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0791-07
DOI: 10.16182/j.issn1004731x.joss.201704012
Localization Method Based on Modified Cuckoo Difference Optimization for Wireless Sensor Networks
Liu Dengfeng1, Zhang Li2, Bing Xiaoying1, Shao Yuqian1, Xu Baoguo1
(1. Key Laboratory of Industrial Advanced Process Control, Ministry of Education, Jiangnan University, Wuxi 214122, China; 2. Spreadtrum Communications Inc., Shanghai 201203, China)
Abstract: To solve the sensitive and accumulative ranging error issue in the trilateration method and the maximum likelihood estimation method for the DV-Hop localization algorithm, an algorithm based on the Cuckoo difference optimization was proposed. The proposed algorithm essentially turned the positioning calculation problem into a group optimization problem. Using the Cuckoo algorithm and the differential evolution algorithm for parallel optimization with double populations, the proposed algorithm fused the advantages of the two kinds of intelligent optimization algorithms, which dynamically rectified the abandoned factor and the scaled variation factor randomly at the same time. The Cuckoo differential evolution algorithm’s global search ability was enhanced to maintain the population diversity, which made the estimated coordinates closer to the real values. Without any increase in communication overhead, the positioning precision was improved effectively.
Keywords: DV-Hop; cuckoo optimization; differential evolution; WSN
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煤矿服务策略的评估方法研究
薛霄,桂彬,王永茂
(河南理工大学计算机科学与技术学院,河南 焦作 454000)
摘要:煤矿服务系统是通过对多个现有信息系统的封装和集成来实现,其中服务策略的运行效果直接决定了服务系统的整体性能。但是,由于煤矿事故的复杂性和煤矿环境的特殊性,难以在实际环境中对服务策略进行测试评估。针对该问题,提出基于计算实验的煤矿服务策略评估方法。该方法分为三个步骤:给出了煤矿服务系统的自适应服务策略;构建出与真实环境相符的实验系统模型;根据模型分析,构建出三维虚拟矿井实验平台,能够对服务策略的正确性进行定量评估。实验结果证明该方法是可行的,能够对服务策略的运行效果提供决策支持。
关键词:煤矿服务策略;信息集成;计算实验;评估方法
中图分类号:TP391????? 文献标识码:A?????? 章编号:1004-731X (2017) 04-0798-11
DOI: 10.16182/j.issn1004731x.joss.201704013
Evaluation Method Research for Coal Mine Services Policy
Xue Xiao, Gui Bin, Wang Yongmao
(School of Computer Sciences and Technology, Henan Polytechnic University, Jiaozuo 454000, China)
Abstract: Mine service is the integration of the package which is based on a number of existing information system, the operation effect of service strategy directly determines the overall performance of the service system. However, due to the complexity of coal mine accidents and the special of mine environment, testing and evaluation of service strategy is very difficult in the actual environment. In order to solve this problem, an integrated evaluation method of coal mine service policy was proposed based on computational experiment. This method could be divided into three steps: the adaptive service strategy of service system in the coal mine was given; the experimental system model was constructed which was similar to the actual environment. According to the analysis of the models, a 3D virtual mine experimental platform was constructed to quantitatively evaluate the correctness of the service strategy. The experimental results show that the method is feasible, and can provide decision-making support for the effect of service strategy.
Keywords: coal services policy; information integration; computational experiments; evaluation method
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一种嵌入式实时网络多媒体数据传输方法
王再见,万婷,吴丹丹,邢青青
(安徽师范大学物理与电子信息学院,安徽 芜湖 241000)
摘要:为提高实时视频数据采集和传输的速率,以现场可编程门阵列(Filed Programmable Gate ArrayFPGA)为核心处理器,以Verilog HDL描述电路功能实现对同步动态随机访问存储器(Synchronous Dynamic Random Access MemorySDRAM)的高速访问,基于典型网络实时传输网络多媒体业务数据。新的视频数据高速实时传输方法充分利用FPGA并行处理的特点,提高视频数据采集和传输速率。实验结果证明了本文方法的有效性。
关键词:高速实时传输;现场可编程门阵列;同步动态随机访问存储器;硬件描述语言
中图分类号:TN919.85????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0808-10
DOI: 10.16182/j.issn1004731x.joss.201704014
Wang Zaijian, Wan Ting, Wu Dandan, Xing Qingqing
(The College of Physics and Electronic Information, Anhui Normal University, Wuhu 241000, China)
Abstract: To improve the speed of data acquisition and real-time video transmission, Filed Programmable Gate Array (FPGA) as the core processor, the Verilog HDL was used to describe the circuit function realization to realize the high-speed access of Synchronous Dynamic Random Access Memory (SDRAM) based on a typical network real-time transmission network multimedia service data. The new high-speed real-time transmission of video data took full advantage of the characteristics of FPGA parallel processing to improve video data acquisition and transmission rates. The experimental results demonstrate the effectiveness of the method.
Keywords: high speed real time transmission; FPGA; SDRAM; verilog HDL
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具有调速器死区的LFC系统的广义自抗扰控制
常帅兵,谭文,曾智勇
(华北电力大学控制与计算机工程学院,北京 102206)
摘要:为了消除调速器死区非线性对系统的影响和保证系统稳定,针对存在调速器死区的负荷频率控制(load frequency controlLFC)系统,采用了自抗扰控制(active disturbance rejection controlADRC)方法,并通过描述函数法验证控制方法的有效性。提出死区线性化方法,并采用了广义自抗扰控制(generalized active disturbance rejection controlGADRC)方法。为能有效地消除死区非线性,提出了一种误差补偿策略。仿真结果显示,提出的误差补偿策略能有效地消除死区非线性,保证了系统的控制性能。提出通过描述函数法获得补偿系数的取值范围也是可行。
关键词:调速器死区非线性;负荷频率控制;描述函数法;广义自抗扰控制;误差补偿策略
中图分类号:TP273????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0818-08
DOI: 10.16182/j.issn1004731x.joss.201704015
Analysis and Design of LFC System with Governor Dead-band via Generalized Active Disturbance Rejection Control
Chang Shuaibing, Tan Wen, Zeng Zhiyong
(School of Control & Computer Engineering, North China Electric Power University, Beijing 102206, China)
Abstract: To eliminate the effect of the governor dead-band nonlinearities and guarantee the system stability, for load frequency control (LFC) of power systems with governor dead-band nonlinearity, the active disturbance rejection control (ADRC) was adopted, and the effectiveness of the control method was verified through the describing function method. A linearized method of dead-band was proposed, and the generalized active disturbance rejection control (GADRC) was adopted. Further, an error compensation scheme was proposed to eliminate the dead-band nonlinearities effectively. Simulation results show that the proposed error compensation scheme can eliminate the dead-band nonlinearity effectively and guarantee the control performance of the system. The describing function method can be proposed to obtain the range of the compensation coefficient.
Keywords: governor dead-band nonlinearity; load frequency control; describing function method; generalized active disturbance rejection control; error compensation scheme
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水上交通流宏观复杂度建模与仿真
文元桥1,2,3,杜磊1,黄亚敏1,孙腾达4,肖长诗1,2,周春辉1,2
(1.武汉理工大学航运学院,湖北 武汉 430063;2.湖北省内河航运技术重点实验室,湖北 武汉 430063; 3. 国家水运安全工程技术研究中心,湖北 武汉 430063;4. 中国交通通信信息中心,北京 100011)
摘要:为了准确描述交通管理人员对水上交通流认知的难易程度,提出了一种定量计算水上交通流宏观复杂度的方法通过模糊聚类将区域交通流的宏观复杂度量转化为对交通簇内、外认知复杂性的测度,并根据交通流动力方程插值得到整个水域的历史交通流场,分别计算聚集复杂度速度特征复杂度以及密度特征复杂度,通过水上交通流宏观复杂度模型获得水上交通流宏观复杂度构造典型水域进行仿真实验,验证了该模型可客观反映水上交通流宏观复杂度的空间分布,交通管理人员能及时地发现复杂度较高的区域,并识别偏离航道或逆航道航行等船舶异常行为。
关键词:交通簇;交通流;聚集复杂度;速度特征复杂度;密度特征复杂度
中图分类号:U698????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0826-06
DOI: 10.16182/j.issn1004731x.joss.201704016
Modeling and Simulation of Marine Traffic Macroscopic Flow Complexity
Wen Yuanqiao1,2,3, Du Lei1, Huang Yamin1, Sun Tengda4, Xiao Changshi1,2, Zhou Chunhui1,2
(1. School of Navigation, Wuhan University of Technology, Wuhan 430063, China; 2. Hubei Key Laboratory of Inland Shipping Technology, Wuhan 430063, China; 3. National Engineering Research Center for Water Transport Safety, Wuhan 430063, China;HcAag8879环亚手机|首页主页
4. China Transport Telecommunications & Information Center, Beijing 100011, China)
Abstract: To accurately describe the difficulty of cognitive traffic in the view of traffic managers, a method for quantitative calculation of marine traffic macroscopic flow complexity was proposed. The similar ships were cataloged into a traffic cluster; According to the historical traffic flow field by interpolation method, the aggregation complexity, the speed-diachronic complexity and the density-diachronic complexity were evaluated. The cognitive complexity was obtained by the marine traffic macroscopic flow complexity, showing the cognitive complexity in the macroscopic complexity map. The simulation experiment shows the macroscopic complexity model is available for demonstrating the distribution of complexity in space.
Keywords: traffic cluster; traffic flow; aggregation complexity; speed-diachronic complexity; density- diachronic complexity
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基于SOC的串联电池组新型均衡策略研究
黄剑龙,潘庭龙,吴定会
(江南大学物联网技术应用教育部工程研究中心,江苏 无锡 214122)
摘要:针对传统的均衡策略中,相邻比值均衡策略能量转移效率低的问题,以及最值均衡策略均衡速度慢的问题,以电池组的SOC(State of Charge)一致为均衡目标,提出了一种新型的均衡策略。该均衡策略根据整个电池组的能量分布情况,以均衡后的SOC平均值的估计值作为参考,对每个均衡器的开关以及能量的传递方向进行控制,从而减少能量传递过程中不必要的能量损耗并加快均衡速度。MATLAB环境下,搭建了仿真模型,并与传统的相邻比值均衡策略和最值均衡策略进行了对比仿真分析,验证了所提均衡策略的有效性。
关键词:电池均衡;均衡策略;荷电状态;单体到单体
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0832-08
DOI: 10.16182/j.issn1004731x.joss.201704017
Research on New Equalization Strategy for Series-connected Battery Strings Based on SOC
Huang Jianlong, Pan Tinglong, Wu Dinghui
(Engineering Research Center of Internet of Things Technology Applications Ministry of Education, Jiangnan University, Wuxi 214122, China)
Abstract:The adjacent cells comparing strategy has a low energy transfer efficiency, and the MAX/MIN value strategy has a slow equalization speed. Then, a new equalization strategy was proposed to overcome above disadvantages, and the uniform of the SOC of the battery strings was used as the equalization goal in this strategy. The strategy used the estimation of the average balanced SOC as a reference, and controlled the switch states and the energy transfer direction of each equalizer, according to the energy distribution of the entire battery strings. With this strategy the unnecessary energy loss during energy transfer was reduced and the equalization speed was speeded up. The simulation model was built with MATLAB, and simulation results were compared with the traditional adjacent cells comparing strategy and the MAX/MIN value strategy. The effectiveness of the proposed equalization strategy was verified.
Keywords: battery equalization; equalization strategy; state of charge; cell to cell
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热连轧液压活套的阀控缸系统建模与仿真
陶桂林1,李维刚2
(1. 武钢股份设备维修总厂,武汉 430080;2. 武汉科技大学信息科学与工程学院,武汉430081)
摘要:从热连轧液压活套阀控缸的流量特性入手,通过对液压缸两腔流量特性的分析与推导,建立了液压活套阀控缸系统的数学模型,该模型区别于传统的负载流量等效模型,适用于对称缸、非对称缸和柱塞缸等多种结构形式。根据自动控制理论的模型简化处理方法,分析推导了该模型的简化形式。对某钢厂液压活套的阀控缸系统的动态过程进行了仿真实验分析,仿真结果与实测数据非常接近,验证了所建模型的有效性与准确性,为分析类似阀控缸对象的动态特性提供了模型依据。
关键词:液压活套;阀控缸;数学模型;仿真
中图分类号:TP139.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0840-07
DOI: 10.16182/j.issn1004731x.joss.201704018
System Modeling and Simulation for Cylinder Controlled by Servo Valve of Hydraulic Looper in Hot Strip Mills
Tao Guilin1, Li Weigang2
(1. Equipment Maintenance Plant, WISCO, Wuhan 430080, China; 2. College of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, China)
Abstract: Starting from the flow characteristics of cylinder controlled by servo valve of hydraulic looper in hot strip mills, a new mathematic model for hydraulic cylinder controlled by servo valve was established by analyzing and deducing the flow characteristics of two chambers of hydraulic cylinder. The model is different from the traditional equivalent model of “load-pressure flux”, and it is adaptable to many structural forms such as symmetric cylinder, asymmetric cylinder and piston cylinder. The simplified equivalent model was deduced by the simplified method of automatic control principles. The simulation experiments were carried out on a practical cylinder controlled by servo valve of hydraulic looper of a hot strip finishing mill. The results show the simulation values are close to the measured values in production field, and verify the effectiveness and accuracy of the proposed model, which provides reliable basis for the analysis of the stability and the dynamic characteristics of the similar system.
Keywords: hydraulic looper; hydraulic cylinder controlled by servo valve; mathematic model; simulation
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基于变量置换的预测维修规划模型建模方法
尤明懿
(中国电子科技集团公司第三十六研究所,浙江 嘉兴 314033)
摘要:提出一种基于变量置换的预测维修规划模型建模方法。基于该方法,通过将传统基于时间的预防维修规划模型中的时间决策变量置换为产品状态监测变量,检验模型参数、维修效果、维修限制的状态相关性,即可实现对应的预测维修规划模型的建模。基于提出的建模方法,应用案例考察了一种尚未见报道的系统效益与状态相关的预测维修规划模型。提出的建模方法充分借鉴现有的预防维修规划模型,简化了预测维修规划模型的建模过程,有望促进预测维修策略的广泛应用。
关键词:预防维修;预测维修;维修建模;维修时间优化
中图分类号:TB114????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0847-06
DOI: 10.16182/j.issn1004731x.joss.201704019
Modeling Approach for Predictive Maintenance Scheduling Model Based on Variable Conversion
You Mingyi
(No.36 Research Institute of CETC, Jiaxing 314033, China)
Abstract: A modeling approach for predictive maintenance (PdM) scheduling model based on decision variable conversion was proposed. Based on the proposed approach, a PdM scheduling model could be established by replacing the time decision variable in the corresponding classical time-based preventive maintenance (PM) scheduling model with product condition variable(s) and checking the correlation of the model parameters, maintenance effect and maintenance constraints with product condition. Based on the proposed modeling approach, the application case study considered an unreported predictive maintenance model in which system benefit was correlated with its condition. The proposed approach used the existing PM scheduling models for reference and simplified the modeling process for PdM scheduling models. The proposed approach can hopefully advance wide application of PdM policies.
Keywords: preventive maintenance; predictive maintenance; maintenance modeling; maintenance time optimization
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ZigBee网络虫洞攻击检测方案设计
史衍卿1,陈伟2,郁滨1
(1.解放军信息工程大学,河南 郑州 450004;2.解放军95942部队,湖北 武汉 430013)
摘要:针对ZigBee网络中虫洞攻击破坏网络拓扑、路由发现和资源分配等问题,在定义虫洞节点、显式和隐式虫洞节点的基础上,提出一种虫洞攻击检测方案,通过判断邻居关系与通信半径是否匹配标记虫洞节点,并在此基础上,设计虫洞节点类型识别流程。安全性分析及实验结果表明,方案在有效检测虫洞攻击的同时具有较小的计算开销。
关键词:ZigBee网络;虫洞攻击;虫洞节点类型;通信时间挑战
中图分类号:TP309.1????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0853-06
DOI: 10.16182/j.issn1004731x.joss.201704020
Wormhole Attack Detection Scheme Design in ZigBee Network
Shi Yanqing1, Chen Wei2, Yu Bin1
(1. PLA Information Engineering University, Zhengzhou 450004, China; 2. Unit 95942 of the PLA, Wuhan 430013, China)
Abstract: Wormhole attacks destroy the network topology, routing discovery and resource allocation in ZigBee network. A wormhole attack detection scheme was proposed, based on the definition of wormhole node, explicit wormhole node and implicit wormhole node. The scheme marked wormhole nodes by judging the matching between neighborhood and communication radius. On this basis, the scheme designed a type recognition mechanism of wormhole nodes. Safety analysis and experiment results show that the scheme detects wormhole attacks effectively with low communication overhead and computation cost.
Keywords: ZigBee network; wormhole attacks; wormhole node type; communication time challenge
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一种基于凝聚度的报警处理算法
黄金垒,王衡军,郁滨
(解放军信息工程大学,河南 郑州 450004)
摘要:在研究分类系统和语义相似度的基础上,给出了簇的凝聚度的概念,提出了一种基于凝聚度的报警处理算法。算法以凝聚度为基础,利用改进的二分K均值算法聚合报警,并对聚合结果进行异常提取。实验结果表明,提出的算法能有效聚合大量报警、发现异常报警,且聚合结果具有良好的语义和较高的准确性
关键词:报警聚合;异常提取;语义相似度;凝聚度;改进二分K均值
中图分类号:TP309.1????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0859-06
DOI: 10.16182/j.issn1004731x.joss.201704021
Cohesion Based Algorithm to Manage IDS Alerts
Huang Jinlei, Wang Hengjun, Yu Bin
(PLA Information Engineering University, Zhengzhou 450004, China)
Abstract: On the basis of intrusion taxonomies and semantic similarity, the concept of cluster cohesion as well as an algorithm was proposed to manage IDS alerts. Based on cohesion, the proposed approach used improved bisecting K-means to aggregate massive alerts, and extracted the abnormal alerts from clusters formed in aggregation. The experimental results show that the approach is effective in alerts aggregation and abnormal alerts detecting, and can generate understandable meta-alerts with higher accuracy.
Keywords: alerts aggregation; anomaly extraction; semantic similarity; cohesion; improved bisecting k-means
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基于高斯伪谱法的高超声速飞行器轨迹优化与跟踪控制
陶超
(上海飞机设计研究院,上海 201210)
摘要:针对复杂的非线性,多约束(状态约束、控制量约束、边界约束和路径约束等)的高超声速上升段质点动力学模型,基于高斯伪谱法对高超声速飞行器上升段轨迹进行优化设计,再以轨迹优化中得到的最优控制量作为参考指令,针对高超声速飞行器纵向非线性刚体动力学模型,结合非线性动态逆方法与PD控制方法对最优参考指令进行跟踪控制。仿真结果表明,基于非线性动态逆方法的PD控制器对高超声速飞行器上升段燃料消耗最小的最优轨迹能够精确地跟踪控制,同时得到更加直接的最优舵面偏转规律。
关键词:高斯伪谱法;高超声速飞行器;轨迹优化跟踪;非线性动态逆
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0865-09
DOI: 10.16182/j.issn1004731x.joss.201704022
Trajectory Optimization and Tracking Controller Based on Gauss Pseudo Spectral Method for Hypersonic Vehicle
Tao Chao
(Shanghai Aircraft Design and Research Institute, Shanghai 201210, China)
Abstract:For a complex nonlinear mass dynamic model in the ascent stage for a hypersonic vehicle with multiple constrains including state constrains, control constrains, boundary constrains and path constrains, a trajectory optimization methodology based on Gauss Pseudo Spectral was proposed for the hypersonic vehicle. The optimal controller of the trajectory optimization results was chosen as the reference command. For the rigid body dynamics of the hypersonic vehicle, a nonlinear dynamic inverse control combined with PD control methodology was proposed to track the reference command. The simulation results demonstrate that, for the minimum fuel consuming trajectory optimization of the ascent stage, the nonlinear dynamic inverse control combined with PD control methodology can track the reference command precisely. At the same time, the optimal control surface deflection is obtained.
Keywords: gauss pseudo spectral; hypersonic vehicle; trajectory optimization and tracking; nonlinear dynamic inverse
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基于RSSI变化趋势的BLE密钥协商方案
张星昊,黄一才,郁滨
(解放军信息工程大学,河南 郑州 450004)
摘要:基于接收信号强度RSSI (Receive Signal Strength Indicator)的变化趋势,设计了一种轻量级的BLE (Bluetooth Low Energy)密钥协商方案。利用自适应跳频机制增强信道特征的变化趋势,依据相干时间内BLE信道特征的随机性和相关性,对接收信号的RSSI进行测量,最终通过计算其变化趋势实现实时的密钥协商。实验结果表明,该方案在保证随机性的前提下,具有较高的密钥生成速率,适用于资源受限的应用场景。
关键词:BLE;相干时间;RSSI;跳频;密钥协商
中图分类号:TP309.1????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0873-07
DOI: 10.16182/j.issn1004731x.joss.201704023
BLE Key Agreement Scheme Based on RSSI Variation Trend
Zhang Xinghao, Huang Yicai, Yu Bin
(PLA Information Engineering University, Zhengzhou 450004, China)
Abstract: Based on the variation trend of received signal strength index, a lightweight BLE key agreement scheme was proposed. Using adaptive frequency hopping, the variation of channel characteristics was strengthened. According to the randomness and reciprocity of BLE channel characteristics in coherence time, the RSSI of BLE signal was measured. And the real-time key was produced by calculating the variation trend. On the basis of experiments results, the randomness of key can be ensured, and a high key generation rate has been reached at the same time. The scheme can be applied to resource-constrained applications.
Keywords: BLE; coherence time; RSSI; frequency hopping; key agreement
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一种基于用户策略的多区域交互控制模型
龚碧,郁滨
(解放军信息工程大学,河南 郑州 450004)
摘要:针对多区域环境下的数据交互问题,建立了一种基于用户策略的多区域交互控制模型。根据安全域和用户策略,提出了模型的基本结构,并给出了传递路径及相关概念。在此基础上,以基于移动存储设备的数据交互方式对模型进行实例化,设置多区域交互场景,并依此设计交互控制器结构。最后建立仿真实验模拟主机读写存储器的过程,判断主机对存储器分区的读写权限及传递路径是否可达,结果表明模型能依据用户策略,实现多区域交互控制功能
关键词:多区域;用户策略;交互控制;移动存储设备
中图分类号:TP309.1????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0880-07
DOI: 10.16182/j.issn1004731x.joss.201704024
Model for Multi-area Interaction Control Based on User Strategy
Gong Bi, Yu Bin
(PLA Information Engineering University, Zhengzhou 450004, China)
Abstract: To solve the problem of multi-area interaction, a model based on user strategy was established. The structure of model was proposed according to security area and user strategy, and transfer path and relevant concept were put forward. The model was instantiated based on portable storage device, the multi-area interaction scene was set up, and the interaction controller structure was designed. Experiments were set up to simulate the host read/write memory process. By judging the host’s read/write jurisdiction to memory partition and whether the transfer path can be arrived, the experimental results show that the model can realize interaction control for multi-area.
Keywords: multi-area; user strategy; interaction control; portable storage device
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基于差分阵列的频控阵雷达距离-角度联合估计
黄玲1,贺知明2,李想2,杨帆2
(1. 兰州理工大学电气工程与信息工程学院,甘肃 兰州 730050;2. 电子科技大学电子工程学院,四川 成都 611731)
摘要:提出一种频控阵雷达目标距离-角度联合估计的子阵方案,以解决基本频控阵雷达由于距离和方位角耦合而不能直接实现目标距离和方位角二维联合估计的问题。方案将整个阵列分为两个子阵列,且两个子阵列采用不同的频偏。为了扩展阵列孔径,子阵列均采用差分阵列结构。当采用接收数据的二阶统计量进行处理时,N个实际物理阵元可提供O(N2)维的自由度。由于两个子阵列对距离和角度维的解耦能力,目标可利用基于子空间的多信号分类算法被定位。目标估计性能是通过分析相对于信噪比的克拉美罗下限来检验的。最后,由数值仿真结果验证了方法的有效性。
关键词:频控阵;距离-角度估计;差分阵列;Root-Music算法;ESPRIT算法
中图分类号:TN95????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0886-08
DOI: 10.16182/j.issn1004731x.joss.201704025
Frequency Diverse Array Radar for Range-Angle Estimation Based on Difference Co-array
Huang Ling1, He Zhiming2, Li Xiang2, Yang Fan2
(1. College of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China; 2. College of Electronic Engineering, University of Electronic Science and Technology, Chengdu 611731, China)
Abstract: Because of the coupling in range and angle responses, which could not estimate directly both the range and angle information of a target, a sub-array scheme of distance-angle joint estimation of a target for frequency diverse array (FDA) radar was proposed. The entire array was divided into two subarrays, which employed two different frequency offsets. For aperture extension, each subarray adopted difference co-array structure to provide degrees of freedom by only ?physical sensors when the second-order statistics of the received data was used. Therefore, the targets range and angle could be estimated directly with the subspace-based multiple signal classification algorithms for the decoupling capability of distance and angle dimensional. The estimation performance was examined by analyzing the Cramer-Rao lower bound (CRLB) versus signal-to-noise ratio (SNR). The effectiveness was verified by the numerical simulation results.
Keywords: Frequency diverse array (FDA); range-angle estimation; difference co-array; Root-MUSIC; ESPRIT
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闸板防喷器关井锁紧过程的闭环回馈仿真
张方舟,孙瑞雪,张文晶,李龙,李强
(东北石油大学计算机与信息技术学院,黑龙江 大庆 163318)
关键词:闸板防喷器;锁紧装置;步进电机;闭环;仿真
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0894-08
DOI: 10.16182/j.issn1004731x.joss.201704026
Closed-Loop Feedback Simulation to Process of Ram Blowout Preventer Shut-in Locking
Zhang Fangzhou, Sun Ruixue, Zhang Wenjing, Li Long, Li Qiang
(College of Computer and Information Technology, Northeast Petroleum University, Daqing 163318, China)
Abstract: Well control training was explained mainly by teacher in recent years. Virtual simulation made it difficult for students to understand the actual operation. Application of drilling well control simulation training system solved effectively the problem of the scene seldom repetition and high cost of well control training. For the simulation of the process of ram blowout preventer shut-in locking in the well controlled physical simulation training system, the stepping motor driver and the stepping motor were installed in ram blowout preventer, and locking operation of the lock device was realized by using speed and torque of the stepping motor for the ram blowout preventer. The closed-loop feedback control system of the stepping motor based on the lock of the ram blowout preventer was proposed. To verify the feasibility of the method, the well control equipment was taken as the background of simulation calculation. Experimental results show the technique reliability and practicability.
Key words: ram blowout preventer; lock device; the stepping motor; closed-loop; simulation
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电压矢量最优的无刷直流电机直接转矩控制
简献忠,钱双杰
(上海理工大学光电信息与计算机工程学院电气系, 上海200093)
摘要:分析了无刷直流电机换相时关断相电流的续流现象,指出了其与转矩脉动的关系。根据转子位置和线圈的绕制方向,修正了传统两相导通模式下电压空间矢量的选取原则针对续流电流不可控的问题提出了三相导通模式下两种不同的电压空间矢量,对续流电流进行增减控制,使其下降速率不断趋近于理想曲线,抑制了转矩脉动。为便于调速,续流结束后,切换为传统的电压矢量并进行Pang-Pang控制。在Simulink环境下进行了仿真建模。仿真结果表明:不论低速还是高速,所提出的电压空间矢量控制策略都能有效调整续流电流,直接控制转矩,使转矩脉动控制在8%以下。
关键词:无刷直流电机;电流续流;电压空间矢量;仿真建模
中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0902-08
DOI: 10.16182/j.issn1004731x.joss.201704027
Direct Torque Control for Brushless DC motor with Optimal Voltage Space Vector
Jian Xianzhong, Qian Shuangjie
(School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China)
Abstract: The current freewheeling phenomenon and its causation of torque ripple were analysed. With the relationship between rotor and coil position, the traditional selection rules of voltage space vector were modified. To effectively control the freewheeling current, two different voltage space vector under the three-phase conduction model was proposed, making current keep close to the ideal curve and inhibit torque ripple. For speed adjustment, the Pang-Pang control was carried out after flow stage. The simulation model was carried out under the Simulink environment. The simulation results show that the proposed voltage space vector can effectively adjust the freewheeling current at the whole speed range and control the torque directly so that the percentage of torque ripple can be controlled below 8%.
Keywords: brushless dc motor; the freewheeling current; voltage space vector; simulation modeling
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基于多agent的跑道侵入风险分析建模及仿真
黄宝军1,房晓丹1,2,王洁宁1
1. 中国民航大学空中交通管理研究基地,天津 300300HcAag8879环亚手机|首页主页
2.
中国民航大学天津市空管运行规划与安全技术重点实验室,天津 300300
摘要:跑道侵入是机场场面运行中目前影响飞行安全的重要问题。根据此问题提出了一种跑道侵入风险分析的新方法,采用多agent建模理论,建立本体agent跑道侵入风险分析模型。针对跑道侵入事故中典型的场景,利用基于时态逻辑的LEADSTO(Language and Environment for Analysis of Dynamics by SimulaTiOn)语言实现了事故发生过程的仿真。实验结果和理论分析说明了时态逻辑建模风险分析方法的有效性。规范飞行员或管制员行为和警觉性可以避免事故发生。与传统方法对比,本方法能对动态系统仿真在时态性和复杂程度上具有一定的优势
关键词:逻辑建模语言(LEADSTO);跑道侵入;风险分析;动态系统
中图分 类号:U8;TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0910-09
DOI: 10.16182/j.issn1004731x.joss.201704028
Risk Simulation Analysis of Runway Incursions Based on Multi Agents
Huang Baojun1, Fang Xiaodan1,2, Wang Jiening1
(1. Air Traffic Management Research Base , Civil Aviation University of China, Tianjin 300300, China; 2. Tianjin Air Traffic Management Operational Planning and Safety Technology Laboratory, Civil Aviation University of China, Tianjin 300300, China)
Abstract:Nowadays, runway incursions are important problems affecting flight safety in airport surface operation. According to this problem, a new method was proposed for the risk analysis of runway incursion by using multi agent modeling theory, which established a risk analysis agent model of runway incursion. Pointing at typical scenarios for runway incursion incidents, LEADSTO (Language and Environment for Analysis of Dynamics by SimulaTiOn) language was applied to realize the accident simulation by temporal logic. Simulation results show that specification for pilot or controller behavior and alertness can avoid accidents occurrence. The proposed method can simulate dynamic system, which has certain advantages in the temporal and complex level in comparison with traditional method.
Keywords: logic modeling language (LEADSTO); runway incursion; risk analysis; dynamic systems
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波浪形底板消力池自由水跃水力特性数值模拟
魏文礼,洪云飞,刘玉玲
(西安理工大学陕西省西北旱区生态水利工程重点实验室,西安 710048)
摘要:采用VOF(Volume of Fluid)方法追踪自由液面,辅以RNG(重正化群)湍流模型封闭两相流时均方程,对9种工况波浪形底板消力池自由水跃的水力特性进行数值模拟。研究发现:波浪形底板表面附近有漩涡产生,沿顺时针方向旋转;波浪形底板上压强呈波浪状分布,相邻波峰和波谷的差值在水跃区沿程减小;在闸孔开度和底板粗糙度相同时,波浪形底板消力池的自由水跃长度和消能率随进口断面弗劳德数增加而增大。
关键词:波浪形底板;消力池;数值模拟;效能率
中图分类号:TP391.1????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-918-08
DOI: 10.16182/j.issn1004731x.joss.201704029
Numerical Simulation on Hydraulic Characteristics of Free Hydraulic Jump on Corrugated Beds of Stilling Basin
Wei Wenli, Hong Yunfei, Liu Yuling
(State Key Laboratory of Eco-Hydraulic Engineering in Shaanxi, Xi’an University of Technology, Xi’an 710048, China)
Abstract: The VOF (volume of fluid) method was applied to track the free water surface, and the RNG ?turbulent model was used to close the two-phase flow time-averaged equations. The conditions properties of free hydraulic jumps on corrugated beds with a stilling basin under 9 kinds of conditions were studied by numerical simulation. Simulation research results show: There are vortexes generated by corrugated beds surfaces, rotating in the clockwise direction. The pressure distribution on corrugated beds in hydraulic jump region appears a wavy change, and the difference between the pressure values at adjacent crest and trough gradually decreases along main flowing direction. With the same the gate opening and bottom roughness, the length of hydraulic jump and the efficiency rate of energy dissipation increase with Froude number increasing at the inlet section of the stilling pool with corrugated beds.
Keywords: Corrugated bed; stilling basin; numerical simulation; energy dissipation rate
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基于PSCAD的核电站动力/电气一体化仿真平台研究
叶鹏1,秦伟2,滕云2,胡耀宁1
(1. 沈阳工程学院电力学院,沈 1101362. 沈阳工业大学电气工程学院,沈阳 110870)
摘要:针对核电站内部运行复杂,对电网变化敏感,数学模型阶数太多的特点,基于PSCAD(Power Systems Computer Aided Design)电磁暂态仿真平台,建立了能反映核电站内部动力部分功率调节特性和并入电力系统运行过程动态情况的一体化仿真平台。利用PSCAD较强的动态控制能力和丰富的库元件模块,通过仿真分析证明了动力部分所具有的功率调节能力并在核电站外接无穷大系统后分析了负荷跟踪过程中核电站的受干扰能力,验证了模型的正确性和适用性。
关键词:PSCAD;核电站;动力/电气;模型仿真;功率调节
中图分类号:TP319.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 04-0926-08
DOI: 10.16182/j.issn1004731x.joss.201704030
Research on Power/electrical Integrated Simulation Platform of Nuclear Power Plant Based on PSCAD
Ye Peng1, Qin Wei2, Teng Yun2, Hu Yaoning1
(1. Shenyang Institute of Engineering, Institute of Electric Power, Shenyang 110136, China; 2. Shenyang University of Technology, Institute of Electrical Engineering, Shenyang 110870, China)
Abstract: Nuclear power plant (NPP) has the characteristics such as complex internally operation, being sensitive to power network changing and large mathematical models. According to electromagnetic transient simulation platform PSCAD, an integrative simulation platform was established to reflect power regulation characteristic in the power section of nuclear power plant (NPP) and the dynamic operation conditions when NPP was incorporated into power system. With the powerful dynamic control ability and abundant library elements of PSCAD, simulation results proved the power regulation capability in NPP. Disturbed capability analysis of NPP was made during the load-following process after NPP merges into power grid, which verifies the platform validity and applicability.
Keywords: PSCAD; nuclear power plant; power/electrical; simulation model; power regulation
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