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2017年第8期

时间:2017-08-17 16:42:17??来源:??作者:

?大气湍流光波传输数值仿真技术研究综述5Wjag8879环亚手机|首页主页

5Wjag8879环亚手机|首页主页

任斌1,2,陈纯毅1,杨华民15Wjag8879环亚手机|首页主页

(1. 长春理工大学计算机科学技术学院,吉林 长春 1300222. 长春工程学院计算机技术与工程学院,吉林 长春 130012)5Wjag8879环亚手机|首页主页

摘要:大气湍流呈现出复杂的随机特性,导致大气湍流光波传输理论的实验测量验证存在困难。数值仿真具有参数可控性,已成为大气湍流光波传输的另一种重要研究手段。针对国内外文献,综述了大气湍流随机相位屏模型、随机相位屏数值生成方法以及光传输数值仿真的空间采样约束。综合分析已有研究成果,指出各向异性湍流随机相位屏生成和光脉冲传输数值仿真还需作进一步深入研究;另外,利用并行计算设备来提高大气湍流光传输数值仿真的速度也是今后的一个研究重点5Wjag8879环亚手机|首页主页

关键词:大气湍流;随机相位屏;分步传输;数值仿真5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1631-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080015Wjag8879环亚手机|首页主页

Survey of Studies on Numerical Simulations of Optical-Wave Propagation in Atmospheric Turbulence5Wjag8879环亚手机|首页主页

Ren Bin1,2, Chen Chunyi1, Yang Huamin15Wjag8879环亚手机|首页主页

(1. School of Computer Science and Technology, Changchun University of Science and Technology, Changchun 130022, China; 2. School of Computer Technology and Engineering, Changchun Institute of Technology, Changchun 130012, China)5Wjag8879环亚手机|首页主页

Abstract: The complicated random behavior of atmospheric turbulence makes it difficult to verify the theories of optical-wave propagation in atmospheric turbulence by conducting experimental measurements. The parameters used in numerical simulations can be easily controlled; therefore numerical simulations have been used as another important tool to investigate the optical-wave propagation in atmospheric turbulence. Based on the existing literature, both the theoretical models and numerical generating methods for random phase screens of atmospheric turbulence are surveyed, and the spatial sampling constraints for numerical simulations of optical propagation in atmospheric turbulence were summarized. By comprehending the existing results, it has been pointed out that, on the one hand, more studies on numerical generating methods for random phase screens of anisotropic turbulence and numerical simulations of optical-pulse propagation in atmospheric turbulence are needed to be done; on the other hand, the application of massively parallel computing hardware to accelerate numerical simulations of optical-wave propagation in atmospheric turbulence deserves much attention in the near future.5Wjag8879环亚手机|首页主页

Keywords: atmospheric turbulence; random phase screen; split-step propagation; numerical simulation5Wjag8879环亚手机|首页主页

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基于显隐式混合积分的多速率仿真5Wjag8879环亚手机|首页主页

张炳达,陈铭,王潇,王岚禹5Wjag8879环亚手机|首页主页

(天津大学智能电网教育部重点实验室,天津 300072)5Wjag8879环亚手机|首页主页

摘要:针对光伏发电并网系统中存在多种开关频率的电力电子器件,研究了一种基于显隐式混合积分的多速率仿真方法。利用电感和电容将光伏发电并网系统拆分为多个子系统,提出了一种多速率接口算法以使各子系统均满足实时性,给出了多速率仿真方法的稳定条件。FPGA平台上搭建了数字式光伏发电并网系统,并进行了DC/DCDC/AC变流控制器硬件在环试验,验证了上述多速率仿真方法的准确性。5Wjag8879环亚手机|首页主页

关键词:光伏发电并网系统;实时仿真;多速率仿真;显隐式混合积分5Wjag8879环亚手机|首页主页

中图分类号:TM743????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1641-065Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080025Wjag8879环亚手机|首页主页

Multi-rate Simulation Based on Explicit-implicit Hybrid Integration5Wjag8879环亚手机|首页主页

Zhang Bingda, Chen Ming, Wang Xiao, Wang Lanyu5Wjag8879环亚手机|首页主页

(Key Laboratory of Smart Grid of Ministry of Education, Tianjin University, Tianjin 300072, China)5Wjag8879环亚手机|首页主页

Abstract: A multi-rate simulation method based on explicit-implicit hybrid integration algorithm for the grid-connected photovoltaic system which included power electronic devices with a variety of switching frequency was put forward. Inductances and capacitances were used to divide the grid-connected photovoltaic system into subsystems. A multi-rate interface was put forward to satisfy the request of real time. The stability criterion of the multi-rate simulation algorithm was put forward. FPGA was used as a platform to build the digital grid-connected photovoltaic system. The hardware in loop test for DC/DC and DC/AC converter controllers was conducted on this platform to verify the accuracy of the proposed multi-rate simulation method.5Wjag8879环亚手机|首页主页

Keywords: grid-connected photovoltaic system; real-time simulation; multi-rate simulation; explicit-implicit hybrid integration5Wjag8879环亚手机|首页主页

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基于遗传算法的多目标动态柔性作业车间调度5Wjag8879环亚手机|首页主页

王春,张明,纪志成,王艳5Wjag8879环亚手机|首页主页

(江南大学电气自动化研究所,江苏 无锡 214122)5Wjag8879环亚手机|首页主页

摘要:针对国内某玩具厂工模车间调度问题的柔性化、动态化等特点,通过引入虚拟工序和虚拟工时概念对该车间建立调度数学模型基于周期调度和动态事件调度相结合的调度策略并采用滚动窗口调度工序技术,将动态调度转化为多个连续静态调度窗口,并在静态调度窗口下采用多目标遗传算法解决该类调度模型。给出了不同的动态事件下工序加工的优先级,并根据优先级对染色体的工序排序部分进行编码和反编码。通过对玩具厂工模车间调度的实际运行,验证了动态调度模型、调度策略及所用遗传算法的有效性。5Wjag8879环亚手机|首页主页

关键词:动态调度;虚拟工序;虚拟工时;滚动窗口;遗传算法;优先级5Wjag8879环亚手机|首页主页

中图分类号:TP183????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1647-115Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080035Wjag8879环亚手机|首页主页

Genetic Algorithm for Solving Multi-Objective Dynamic Flexible Job Shop Scheduling5Wjag8879环亚手机|首页主页

Wang Chun, Zhang Ming, Ji Zhicheng, Wang Yan5Wjag8879环亚手机|首页主页

(Institute of Electrical Automation, Jiangnan University, Wuxi 214122, China)5Wjag8879环亚手机|首页主页

Abstract: To solve the scheduling problem of mold workshop in a toy factory with dynamic and flexible features, a mathematical model was established by introducing virtual operation and virtual working hours. Based on the strategies of periodic scheduling combined with dynamic event scheduling as well as the rolling window scheduling operation technology, dynamic scheduling was transformed into several continuous static scheduling windows, under which multi-objective genetic algorithm was used to solve the model. The priority of operation scheduling was given in different dynamic events. In addition, the encoding and anti-encoding of chromosome’s operation sequence were made based on the proposed priority. Real running of mold workshop scheduling verifies the effectiveness of the proposed dynamic scheduling model, scheduling policy and the algorithm.5Wjag8879环亚手机|首页主页

Keywords: dynamic scheduling; virtual operation; virtual working hours; rolling window; genetic algorithm; priority5Wjag8879环亚手机|首页主页

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自主车辆动态冲突控制可达集建模方法5Wjag8879环亚手机|首页主页

曹凯,刘秀芳,杨旭,沈鹏5Wjag8879环亚手机|首页主页

(山东理工大学交通学院,山东 淄博 255049)5Wjag8879环亚手机|首页主页

摘要:针对自主车辆主动安全控制建模问题,提出采用形式化建模与动态非合作博弈论相结合方法,研究多自主车辆动态冲突条件下轨迹追踪和碰撞躲避的控制策略提出将系统控制划分为:轨迹追踪、碰撞躲避以及追踪与躲避切换的三种模式。考虑到自主车辆这个混成系统的复杂性与轨迹追踪偏差的存在性,提出对车辆碰撞躲避预警及控制采用可达集建模。为了保证车辆轨迹追踪的稳定性,提出具有迟滞特性的追踪躲避切换算法。系统验证表明,当阈值α1 = 0.05α2 = 0.08时,提出的算法使系统稳定性最佳。而且系统控制的划分发挥了独立模型的优势,降低了计算成本。5Wjag8879环亚手机|首页主页

关键词:混成系统;碰撞躲避;主动安全控制;模式切换;轨迹追踪5Wjag8879环亚手机|首页主页

中图分类号:X913.3;U471.15????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1658-095Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080045Wjag8879环亚手机|首页主页

Reachable Set Modeling Approach for Autonomous Vehicle’s Dynamic Conflict Control5Wjag8879环亚手机|首页主页

Cao Kai, Liu Xiufang, Yang Xu, Shen Peng5Wjag8879环亚手机|首页主页

(School of Traffic & Vehicle Engineering, Shandong University of Technology, Zibo 255049, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at the problem of active safety control modeling for autonomous vehicles, a combined method using the formal modeling and the dynamic non-cooperative game theory was proposed for discussing a control strategy of trajectory tracking and collision avoidance under dynamic conflict condition between autonomous vehicles. And it was proposed to divide the system control into three modes: trajectory tracking, collision avoidance and switching between trajectory tracking and collision avoidance. Taking into account the complexity as a hybrid systems and the existence of the trajectory tracking error for autonomous vehicle, a modeling approach based on reachable set was proposed for the collision avoidance control of vehicle. In addition, to ensure the stability of the trajectory tracking of vehicles, a switching algorithm with hysteresis characteristics was proposed. The system validation shows that the best stability is achieved for the proposed algorithm when the threshold α1 = 0.05 and α2 = 0.08. And the division of system control plays the advantage of independent model, which reduces the computational cost.5Wjag8879环亚手机|首页主页

Keywords: hybrid system; collision avoidance; active safety control; mode switching; trajectory tracking5Wjag8879环亚手机|首页主页

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基于简单手绘的树木快速建模5Wjag8879环亚手机|首页主页

马玲,李书杰,刘晓平5Wjag8879环亚手机|首页主页

(合肥工业大学计算机与信息学院,安徽 合肥 2300095Wjag8879环亚手机|首页主页

摘要:针对树木建模过程繁琐、专业知识要求高等问题,提出一种面向非专业用户的树木建模方法将简单手绘与枝叶库结合,实现让普通用户快速创造树木模型的目的。对用户的手绘草图预处理,消除笔画噪声点和错误点并完成笔画识别,对主干和分支进行三维重建,再依据二维轮廓构建三维子轮廓,以此为约束,从枝叶库中提取合适的枝叶模型插入到分支插入点上,从而完成整个建模过程。实验表明,该方法能让非专业用户在几十秒内建模出完整的树木模型。5Wjag8879环亚手机|首页主页

关键词:树木建模;简单手绘;枝叶库;手绘建模;快速建模5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1667-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080055Wjag8879环亚手机|首页主页

Fast Tree Modeling Method Based on Simple Freehand Sketch5Wjag8879环亚手机|首页主页

Ma Ling, Liu Xiaoping, Liu Xiaoping5Wjag8879环亚手机|首页主页

(School of Computer and Information, Hefei University of Technology, Hefei 230009, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at problems such as complicated process and professional knowledge requirements in tree modeling, a quick tree modeling method for non-experts was proposed, combining branch library with simple sketch to make non-experts create tree model quickly. The method preprocessed the sketch to eliminate noise and error points and identify the strokes, the trunk and branch were reconstructed, child three-dimensional profile was built through the two-dimensional canopy profile, under the constraint of the child profile, suitable branches from library and insert were extracted into the branches, consequently the whole tree model was completed. Experimental results show that this method can make non-expert quickly create a complete tree model.5Wjag8879环亚手机|首页主页

Keywords: tree modeling; simple sketch; branch library; sketch-based modeling; fast modeling5Wjag8879环亚手机|首页主页

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基于自适应电池模型的SOC加权在线估计5Wjag8879环亚手机|首页主页

孙豪豪,潘庭龙,吴定会5Wjag8879环亚手机|首页主页

(江南大学物联网技术应用教育部工程研究中心,无锡 214122)5Wjag8879环亚手机|首页主页

摘要:针对传统锂电池模型在SOC估计上自适应能力差,以及单一SOC估计算法局部估计精度低的问题,提出了一种利用多新息随机梯度算法进行模型参数在线辨识及SOC (荷电状态)加权在线估计方法。锂离子电池模型参数在线辨识结果实时更新,实现锂离子电池模型自适应。针对SOC的估计,提出了基于PI (比例积分)调节器的开路电压法并结合安时积分法的加权在线估计方法,权值依据当前SOCE0分段线性曲线斜率动态更新,解决了开路电压法平台区估计误差大、安时积分法难以确定初值和误差累积以及两种方法难以在线估计的问题。从理论分析上论证了方法的可行性,并从MATLAB仿真结果上验证了所提方法具有较高的估计精度。5Wjag8879环亚手机|首页主页

关键词:锂电池;SOC;模型自适应;PI调节器;开路电压法;安时积分法5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1677-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080085Wjag8879环亚手机|首页主页

Weighted Online Estimation of SOC Based on Adaptive Battery Model5Wjag8879环亚手机|首页主页

Sun Haohao, Pan Tinglong, Wu Dinghui5Wjag8879环亚手机|首页主页

(Engineering Research Center of Internet of Things Technology Applications Ministry of Education, Jiangnan University, Wuxi 214122, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at the problem that the traditional lithium battery model has poor adaptive ability in SOC estimation and the local estimation accuracy of the single SOC estimation algorithm is low, online identification of model parameters with Multi-Innovation Stochastic Gradient algorithm and method of weighted online estimation of SOC was proposed. The results of lithium-ion battery model parameters online identification updated in real time, realizing lithium-ion battery model adaptive. Aiming at the estimation of SOC, a method of weighted online estimation method based on the PI (proportion and integral) regulator’s OCV combined with Ah (an integral method) was proposed. Weights updated in real time according to SOCE0 piecewise linear curve slope. The proposed method solved that the estimation error of SOC with OCV is large and Ah method is difficult to determine the initial value and cumulative error. Besides, the proposed method also solved the problem of online estimation of above two method. The feasibility of the method is demonstrated from the theoretical analysis, and the results of MATLAB simulation show that the proposed method has high estimation accuracy.5Wjag8879环亚手机|首页主页

Keywords: lithium-ion battery; SOC; model adaptive; PI regulator; OCV; Ah5Wjag8879环亚手机|首页主页

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基于莱维飞行的改进粒子群算法5Wjag8879环亚手机|首页主页

李荣雨,王颖5Wjag8879环亚手机|首页主页

(南京工业大学计算机科学与技术学院,江苏 南京 211816)5Wjag8879环亚手机|首页主页

摘要:对基本粒子群算法容易发生早熟收敛,陷入局部极值,进化后期收敛速度慢以及精度低等缺点,提出了基于莱维飞行的改进粒子群算法。在粒子位置更新公式中,消除速度项对收敛速度的影响,利用莱维飞行改变粒子位置移动方向,防止粒子陷入局部最优值,通过贪婪的更新评价策略,选择最优解,从而得到全局最优。实验结果表明,与基本粒子群算法、布谷鸟搜索算法以及蜂群算法相比,所提出的基于莱维飞行的改进粒子群算法能够有效地提高解的精度并加快收敛速度,寻优效果更优。5Wjag8879环亚手机|首页主页

关键词:粒子群算法;莱维飞行;贪婪策略;优化5Wjag8879环亚手机|首页主页

中图分类号:TP301.6????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1685-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080075Wjag8879环亚手机|首页主页

Improved Particle Swarm Optimization Based on Lévy Flights5Wjag8879环亚手机|首页主页

Li Rongyu, Wang Ying5Wjag8879环亚手机|首页主页

(College of Computer Science and Technology, Nanjing Tech University, Nanjing 211816, China)5Wjag8879环亚手机|首页主页

Abstract: The particle swarm optimization (PSO) has some demerits, such as relapsing into local extremum, slow convergence velocity and low convergence precision in the late evolutionary. The Lévy particle swarm optimization (Lévy PSO) was proposed. In the particle position updating formula, Lévy PSO eliminated the impact of speed on the convergence rate, and used Levy flight to change the direction of particle positions movement to prevent particles getting into local optimum value, and then using greedy strategy to update the evaluation and choose the best solution to obtain the global optimum. The experimental results show that Lévy PSO can effectively improve the accuracy and convergence speed and the Lévy PSO has better optimization effect than PSO, Cuckoo Search (CS) and Artificial Bee Colony Algorithm (ABC).5Wjag8879环亚手机|首页主页

Keywords: particle swarm optimization; Lévy fights; greedy strategy; optimization5Wjag8879环亚手机|首页主页

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基于ISSM的密码服务系统虚拟化性能建模5Wjag8879环亚手机|首页主页

郭松辉1,2,李清宝1,2,孙磊1,龚雪容1,杨天池15Wjag8879环亚手机|首页主页

1. 解放军信息工程大学,郑州 4500012. 数学工程与先进计算国家重点实验室,郑州 4500015Wjag8879环亚手机|首页主页

摘要:针对密码服务系统虚拟化结构复杂导致性能建模难度大的问题,提出了一种基于交互随机子模型(Interactive Stochastic Sub-Models, ISSMs)的性能建模方法,将任务执行过程划分为主机预处理和运算单元执行两个阶段,并基于排队论分别建立了两个子模型在此基础上对密码服务系统虚拟化性能模型的有效性进行了验证。结果表明,所建模型能够定量分析任务的到达速率、主机配置与密码卡配置对系统性能的影响,该模型同时也有助于指导云计算环境下密码服务系统虚拟化部署方案的设计5Wjag8879环亚手机|首页主页

关键词:密码服务系统;虚拟化;性能建模;响应时间;云计算;拒绝概率5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1692-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080085Wjag8879环亚手机|首页主页

Performance Modeling of Cryptographic Service System Virtualization Based on ISSM5Wjag8879环亚手机|首页主页

Guo Songhui1,2, Li Qingbao1,2, Sun Lei1, Gong Xuerong1, Yang Tianchi15Wjag8879环亚手机|首页主页

(1. PLA Information Engineering University, Zhengzhou 450001, China; 2. State Key Laboratory of Mathematical Engineering and Advanced Computing, Zhengzhou 450001, China)5Wjag8879环亚手机|首页主页

Abstract: The complicated architecture of cryptographic service system virtualization raised the difficulty of performance modeling. A performance modeling approach based on ISSMs was proposed. The approach divided the execution process into two stages, host preprocessing and arithmetic-module calculating, and built two sub-models based on queuing theory. On this basis, the effectiveness of this approach was verified. The results show that this method can analyze the impacts on system performance caused by task arrival rates, host and cryptographic card configurations quantitatively, and also be helpful for providing reasonable solutions to deploy virtualized cryptographic service system on cloud computing platforms.5Wjag8879环亚手机|首页主页

Keywords: cryptographic service system; virtualization; performance modeling; response time; cloud computing; blocking probability5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于对象Petri网的信任攻击建模与分析5Wjag8879环亚手机|首页主页

黄光球,白璐5Wjag8879环亚手机|首页主页

(西安建筑科技大学管理学院,陕西 西安 7100555Wjag8879环亚手机|首页主页

摘要:在信任攻击图的基础上,提出了一种面向对象的信任攻击Petri网模型,该模型动态描述了攻击者在信任主体对象部件间的攻击行为。通过引入对象Petri网,使信任主体对象和部件间的信任攻击关系在Petri网中展现,从而模拟仿真了部件间协同工作的场景;根据重新编写的信任关系重建规则,提出了信任攻击路径推理算法,使攻击者在进行攻击的同时掌握攻击部件的危害度变化,从而决定进攻方向,找出到达攻击目标的最大威胁度攻击路径。最后用实例验证了该模型能够动态描述信任主体对象部件间的攻击关系,并准确找到信任环境中的信任攻击路径。5Wjag8879环亚手机|首页主页

关键词:信任;信任攻击;对象Petri网;信任关系重建;信任攻击路径5Wjag8879环亚手机|首页主页

中图分类号:TP393.08????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1702-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080095Wjag8879环亚手机|首页主页

Modeling and Analysis of Trust Attack Based on Object-oriented Petri Net5Wjag8879环亚手机|首页主页

Huang Guangqiu, Bai Lu5Wjag8879环亚手机|首页主页

(School of Management, Xi'an University of Architecture and Technology, Xi'an 710055, China)5Wjag8879环亚手机|首页主页

Abstract: On the basis of trust attack graph, the object-oriented trust attack Petri net model was put forward, the dynamic model described the attack behaviors among components of trust entity object. By introducing the object Petri net, the trust attack relations between trust entity objects and components were shown in the Petri net, simulating the collaborative work between the components. According to the new trust relation reconstruction rules, a trust attack path inference algorithm was proposed to make the attacker knowing the changes of harmfulness when attacking the components, thus the attacker could decide the attack direction. The maximal threat path which could arrive at an attack goal could be searched out. An experiment shows that the model can describe the dynamic trust entity object attack relations between components, and accurately find the trust attack path in the trust environment.5Wjag8879环亚手机|首页主页

Keywords: trust; trust attack; object Petri net; trust relation reconstruction; trust attack path5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于改进差分算法的电站锅炉主蒸汽温度多变量建模研究5Wjag8879环亚手机|首页主页

李芹1,2,张浩1,2,彭道刚2,郭义波2,王念龙3,孙宇贞1,25Wjag8879环亚手机|首页主页

(1. 同济大学电子与信息工程学院,上海 2018042. 上海电力学院自动化工程学院上海市电站自动化技术重点实验室,上海 2000903. 上海明华电力技术工程有限公司,上海 200090)5Wjag8879环亚手机|首页主页

摘要:针对主汽温常规单变量串级控制效果差的问题,在分析相关影响因素的基础上,提出了一种主汽温多变量传递函数模型结构。针对标准差分进化算法的缺点,提出了一种随机选择变异策略和自适应调整变异率交叉率的改进算法,并将该算法应用于主汽温闭环多变量传递函数模型辨识。给出了从电厂现场分布式控制系统历史数据库获取有效辨识数据的原则和方法,利用从某1000 MW机组获取的数据进行主汽温多变量模型辨识和校验,校验结果表明了辨识模型的有效性。通过对多变量模型辨识结果的进一步分析,给出了主汽温常规串级控制系统调整和优化的建议。5Wjag8879环亚手机|首页主页

关键词:主汽温;闭环;多变量;差分进化算法5Wjag8879环亚手机|首页主页

中图分类号:TP273????? 文献标识码:A??? ???文章编号:1004-731X (2017) 08-1712-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080105Wjag8879环亚手机|首页主页

Multi-variable Modeling Research for Main-steam Temperature of Power Station Boiler Based on Improved Differential Evolution Algorithm5Wjag8879环亚手机|首页主页

Li Qin1,2, Zhang Hao1,2, Peng Daogang2, Guo Yibo2, Wang Nianlong3, Sun Yuzhen1,25Wjag8879环亚手机|首页主页

(1. College of Electronics and Information Engineering, Tongji University, Shanghai 201804, China; 2. College of Automation Engineering, Shanghai University of Electric Power Shanghai Key Laboratory of Power Station Automation Technology, Shanghai 200090, China; 3. Shanghai Minghua Electric Power Technology Engineering Ltd., Shanghai 200090, China)5Wjag8879环亚手机|首页主页

Abstract: By analyzing the factors which affected the main-steam temperature, a multi-variable model was introduced to overcome the bad result of single variable cascade control. An improved differential evolution algorithm was proposed including mutation strategies random selection, crossover ratio and mutation ratio adaptive adjustment, which was used for closed-loop identification of main-steam multi-variable transfer function model. The principle and method how to obtain valid identification data from power plant distributed control system history database was introduced, and the data from some 1 000 MW coal-fired power plant was used to identify and verify the main-steam temperature multi-variable model, the verification result shows the validation of model. By further analyzing the multi-variable model identification result, an optimization method was suggested for the conventional main-steam cascade control.5Wjag8879环亚手机|首页主页

Keywords: main-steam temperature; closed-loop; multi-variable; differential evolution algorithm5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

无刷直流电机三段式换相转矩脉动抑制仿真研究5Wjag8879环亚手机|首页主页

朱俊杰,刘浩然5Wjag8879环亚手机|首页主页

(中南林业科技大学,湖南 长沙 4100185Wjag8879环亚手机|首页主页

摘要:针对无刷直流电机在换相期间存在转矩脉动的问题,在已有两相PWM调制技术的基础上提出了基于电压平衡的三段式三相PWM调制技术,在较宽速度范围内抑制无刷直流电机的换相转矩脉动。以电机三相绕组中非换相相端口与中性点电压差在换相前与换相后变化特征为研究对象,获得了换相前后电压差变化规律,提出了在换相开始后将换相期分成三个阶段分别对功率管进行PWM调制,通过保持换相前后电压差不变的方法抑制换相时定子电流脉动的方法。相对于已有的以换相中两相电流斜率为研究目标的三段式三相PWM调制技术,此方法存在参数易于获取、计算简单、取样电路设计简单等优点,有效提高了此方法在实践应用中的普适性。5Wjag8879环亚手机|首页主页

关键词:换相转矩脉动抑制;无刷直流电机;电压平衡;脉宽调制5Wjag8879环亚手机|首页主页

中图分类号:TM383????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1719-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080115Wjag8879环亚手机|首页主页

Simulation of Three-region Commutation Torque Ripple Reduction for Brushless DC Motor5Wjag8879环亚手机|首页主页

Zhu Junjie, Liu Haoran5Wjag8879环亚手机|首页主页

(Central South University of Forestry and Technology, Changsha 410018, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at brushless DC motor torque ripple during commutation section, new three-step three phases PWM method was proposed based on voltage balance principle, improving existing two phase PWM suppression method and suitable for all speed section. In this new method, the principle of non-commutation phase voltage and the neutral point voltage variation was researched. Voltage difference was remained the same by three-step PWM control strategy before and after commutation in order to suppression current ripple. Comparing with existing current slope research method, this new method is with a series of advantages: simple parameters, computing, and sampling circuit design. System suitability is improved.5Wjag8879环亚手机|首页主页

Keywords: commutation torque ripple reduction; brushless DC; voltage balance principle; PWM5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

海洋石油平台长方体障碍物对天然气爆炸影响研究5Wjag8879环亚手机|首页主页

王鹏程,孙玉清5Wjag8879环亚手机|首页主页

(大连海事大学轮机工程学院,辽宁 大连 116026)5Wjag8879环亚手机|首页主页

摘要:平台上分布的设备数量和阻塞率对爆炸产生的超压峰值和温度峰值有很大影响,通过合理布放设备,可以最大限度地降低爆炸造成的损失。有限元方法被广泛应用于气体云爆炸的仿真,因此利用有限元方法建立了具有不同长方体障碍物的海洋石油平台模型。通过对于15种不同长方体障碍物分布的情况进行仿真,得到了超压峰值随障碍物数量、阻塞率的变化规律。研究结果表明,随着长方体障碍物数量和阻塞率的增加,爆炸的超压峰值明显增加,温度峰值增加幅度较小且集中维持在2 000 ~2 500 K之间。所得结果不但对于海洋石油平台设备的合理布局具有一定的指导意义,还可以为类似事故的调查分析提供一定的理论依据。5Wjag8879环亚手机|首页主页

关键词:长方体障碍物;阻塞率;有限元方法;海洋石油平台5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1726-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080125Wjag8879环亚手机|首页主页

Research on Natural Gas Explosion Rules for Cuboid Obstacles in Offshore Oil Platform5Wjag8879环亚手机|首页主页

Wang Pengcheng, Sun Yuqing5Wjag8879环亚手机|首页主页

(Marine Engineering College, Dalian Maritime University, Dalian 116026, China) 5Wjag8879环亚手机|首页主页

Abstract: Quantities and blockage ratios of equipment on the platform has a great effect on the peak overpressure and temperature. The loss caused by explosion can be reduced to the minimum through the reasonable distribution of equipment, and the finite element method has been widely used in the simulation of gas cloud explosion. Offshore oil platform models with different cuboid obstacles were established by the finite element method and cuboid obstacles were distributed in 15 different situations. Mathematical relationships between overpressure and cuboid obstacles’ quantities and blockage ratios were obtained. The results show that with the increase of quantities and blockage ratios, the peak overpressure increases obviously and peak temperature increases slowly which concentrates on 2000 K to 2500 K. The research only provides references to the reasonable layout of equipment on the offshore oil platform, but also provides the certain theoretical basis for the investigation and analysis of similar accidents.5Wjag8879环亚手机|首页主页

Keywords: cuboid obstacle; blockage ratio; finite element method; offshore oil platform5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于半实物仿真的采摘机器人视觉定位研究5Wjag8879环亚手机|首页主页

陈科尹1,2,邹湘军3*,彭红星3,梁海英4,胡元闯45Wjag8879环亚手机|首页主页

(1. 贺州学院信息与通信工程学院,广西 贺州 5428992. 农业部南京农业机械化研究所,江苏 南京 2100143. 华南农业大学南方农业机械与装备关键技术省部共建教育部重点实验室,广东 广州 5106424. 贺州学院数学与计算机学院,广西 贺州 542899)5Wjag8879环亚手机|首页主页

摘要:针对基于实物采摘机器人的视觉定位的准确度、稳定性以及试验验证易出错、周期长、不易于室内进行等问题,结合采摘机器人视觉定位机理和机器人运动学,提出了一种基于半实物仿真技术的采摘机器人视觉定位研究方法。该方法采用虚拟采摘机器人代替实物机器人,在虚拟仿真环境下对水果目标采摘点进行定位研究,即视觉定位半实物仿真。试验结果表明:在视觉定位半实物仿真环境下,水果目标定位的平均绝对误差和相对误差分别仅约为2.89 mm0.43%,满足实际视觉定位精度的要求,从而验证了该仿真方法的有效性和可行性。5Wjag8879环亚手机|首页主页

关键词:采摘机器人;视觉定位;机器人运动学;半实物仿真5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1736-125Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080135Wjag8879环亚手机|首页主页

Research on Picking Robot Vision Localization Based on Semi-physical Simulation5Wjag8879环亚手机|首页主页

Chen Keyin1,2, Zou Xiangjun3*, Peng Hongxing3, Liang Haiying4, Hu Yuanchuang45Wjag8879环亚手机|首页主页

(1. School of Information and Communication Engineering, Hezhou University, Hezhou 542899, China; 2. Nanjing Institute of Agricultural Mechanization, Ministry of Agriculture, Nanjing 210014, China; 3. Key Lab of Key Technology of South Agricultural Machine and Equipment Ministry of Education, South China Agricultural University, Guangzhou 510642, China; 4. School of Mathematics and Computer Science, Hezhou University, Hezhou 542899, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at the problems of accuracy and stability of the vision localization based on physical picking robot, which were easy to make mistakes, long cycle, and not easy to be carried out indoors, a picking robot vision localization method based on the semi-physical simulation technology was proposed combining with the robot vision localization mechanism and robot kinematics. This method adopted the virtual picking robot to instead of the physical robot, and studied the vision localization of the fruit target in the virtual simulated environment, which was as the vision localization based on semi-physical simulation. The test results show that: the average absolute error and relative error of the target fruit are only about 2.89 mm and 0.43% in the vision localization simulated environment, which is in line with the accuracy requirements of the actual vision localization, so the effectiveness and feasibility of this simulation method are validated.5Wjag8879环亚手机|首页主页

Keywords: the picking robot; vision localization; robot kinematics; semi-physical simulation5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

跳伞模拟器人机交互可视化功能研究5Wjag8879环亚手机|首页主页

韩亮1,公璇1,王江云1,杜阳华25Wjag8879环亚手机|首页主页

1.北京航空航天大学自动化科学与电气工程学院,北京 1001912.中国船舶重工集团公司第七一六研究所,江苏 连云港 2220065Wjag8879环亚手机|首页主页

摘要:跳伞模拟器整体系统包含一系列软件、硬件的开发,使跳伞训练人员通过头盔显示系统、模拟操作装备达到跳伞训练的目的,结合系统建模、运动解算、视景开发以及专家知识库评估,构成一套完整的跳伞模拟训练装备。主要介绍了跳伞模拟器人机交互功能中头盔显示器的工作原理与Vega Prime视景开发的原理及流程,对于训练者的视点信息采集进行了创新性的探究。通过在Vega Prime视景开发系统中配置环境特效、场景控制以及碰撞检测信息驱动场景,给跳伞员呈现实时逼真的训练环境。5Wjag8879环亚手机|首页主页

关键词:跳伞模拟器头盔显示器;人机交互视景仿真5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1747-065Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080145Wjag8879环亚手机|首页主页

Study on visual Function of Human Computer Interaction in Parachuting Simulator5Wjag8879环亚手机|首页主页

Han Liang1, Gong Xuan1, Wang Jiangyun1, Du Yanghua25Wjag8879环亚手机|首页主页

(1. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100191, China; 2. Institute 716, China Shipbuilding Industry Corporation, Lianyungang 222006, China)5Wjag8879环亚手机|首页主页

Abstract: The parachuting training system consists of software and hardware, to simulate the parachute training through head mounted display and operating equipment, combined with system modeling, kinematic computation, visual display and expert evaluation. Principle methods of head mounted display with human-computer interactive function and exploitation of Vega Prime inventive exploration on the information collection of viewpoint are conducted. It provides a real time training environment through the configuration of environmental effects, scene control, collision detection and driving information.5Wjag8879环亚手机|首页主页

Keywords: parachuting simulator; head mounted display; human-computer interaction; visual simulation5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于观测器的永磁同步电机积分反推控制5Wjag8879环亚手机|首页主页

兰永红,王亮亮,陈才学5Wjag8879环亚手机|首页主页

(湘潭大学信息工程学院,湖南 湘潭,411105)5Wjag8879环亚手机|首页主页

摘要:针对永磁同步电机(PMSM)的速度跟踪控制问题,提出了一种基于观测器的反推控制器设计方法。为了重构电机转速及定子交轴电流,构造了永磁同步电机的全维Luenberger观测器;利用Lyapunov稳定性理论,获得了基于线性矩阵不等式(LMI)的观测器设计方法通过设计包含重构变量的虚拟控制输入,加入转速跟踪误差积分环节,并运用反推控制策略来设计闭环系统控制器,实现电机转速输出对期望输出信号的高精度跟踪。通过Matlab数值仿真,验证了该方法的有效性。5Wjag8879环亚手机|首页主页

关键词:永磁同步电机;无速度传感器;观测器;反推控制5Wjag8879环亚手机|首页主页

中图分类号:TP13???? ??文献标识码:A?????? 文章编号:1004-731X (2017) 08-1753-095Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080155Wjag8879环亚手机|首页主页

Observer-based Integral Backstepping Control for Permanent Magnet Synchronous Motor5Wjag8879环亚手机|首页主页

Lan Yonghong, Wang Liangliang, Chen Caixue5Wjag8879环亚手机|首页主页

(School of information engineering college, Xiangtan university, Xiangtan 411105, China)5Wjag8879环亚手机|首页主页

Abstract: For the speed tracking control problem of Permanent Magnet Synchronous Motor (PMSM), an observer-based back-stepping speed tracking control method was presented. To reconstruct the motor speed and stator axis current, a full order Luenberger observer for PMSM was constructed. By using Lyapunov stability theory, the linear matrix inequality (LMI) based design method of observer was obtained. Through the design of the virtual control input that include the reconstruction variables, using back-stepping control strategy and integrating with tracking errors, the controller of the closed-loop system was proposed. The obtained controller can achieve high precision speed tracking. The validity of these methods were verified by a numerical example.5Wjag8879环亚手机|首页主页

Keywords: PMSM; speed sensorless; observer; backstepping control5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

磁场作用下平行平板内导电流体的流动稳定性5Wjag8879环亚手机|首页主页

董帅,刘立帅,叶学民5Wjag8879环亚手机|首页主页

(华北电力大学能源动力与机械工程学院,河北 保定 071003)5Wjag8879环亚手机|首页主页

摘要:采用非正则模态稳定性分析方法,对法向磁场作用下导电流体在导电平行平板内的流动稳定性进行了数值模拟,分析了磁场对流动稳定性的影响。结果表明,哈特曼数Ha较大时(Ha>9),上、下两个哈特曼边界层基本上各自独立,互不影响;哈特曼数Ha较小时(Ha<9),上、下两个哈特曼边界层距离较近,存在着一定的相互作用,并影响着整个流场的稳定性。平板导电时的扰动增长特征与平板绝缘情形下基本类似;但在平板导电条件下,磁场对扰动的抑制效果更明显。5Wjag8879环亚手机|首页主页

关键词:导电平板;哈特曼边界层;稳定性;非正则模态;数值模拟;流动5Wjag8879环亚手机|首页主页

中图分类号:O 361.5 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 08-1762-105Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080165Wjag8879环亚手机|首页主页

Stability of Electrically Conducting Fluid Flow in Channel under Magnetic Field5Wjag8879环亚手机|首页主页

Dong Shuai, Liu Lishuai, Ye Xuemin5Wjag8879环亚手机|首页主页

(School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding 071003, China)5Wjag8879环亚手机|首页主页

Abstract: The stability of conducting fluid flow in a channel under a vertical magnetic field was simulated by non-normal modal stability analysis. The perfect conductivity assumption of the channel wall ?was employed in the model, and its effect on the stability problem was considered. The results show that when the Hartmann number Ha is larger than 9, the two opposite Hartmann boundary layers are essentially independent of each other; however, when the Hartmann number Ha is smaller than 9, there are still residual interactions between the two opposite Hartmann boundary layers, which has influences on the stability of the flow. Furthermore, the growth of disturbances in the present case is similar to the one with insulating walls. When the walls are conducting, the suppression effect of the magnetic field on the disturbances is more significant.5Wjag8879环亚手机|首页主页

Keywords: conducting walls; Hartmann boundary layers; stability; non-normal modal; numerical simulation; flow5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

机场助航单灯监控系统能耗均衡路由协议研究5Wjag8879环亚手机|首页主页

高梅,王丙元,张丹丹,孙兆荣5Wjag8879环亚手机|首页主页

(中国民航大学电子信息与自动化学院,天津 3003005Wjag8879环亚手机|首页主页

摘要:为延长无线传感网络的节点使用寿命,均衡网络能耗,在分析研究AL-CAME协议和ECOMP协议的基础上,针对机场助航灯单灯监控系统,提出了基于簇的层次化能耗均衡路由协议。协议将每两排传感节点划分成一个簇,簇头按照最大剩余能量原则选举产生,并负责完成簇内数据融合,通过路径均衡算法选择簇头到基站的最佳数据传输路径。仿真结果表明能耗均衡路由协议降低了节点能量开销,有效均衡了网络的节点能耗,延长了网络生命周期。5Wjag8879环亚手机|首页主页

关键词:无线传感器网络;助航灯光;能量均衡;路径均衡5Wjag8879环亚手机|首页主页

中图分类号:TP393????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1772-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080175Wjag8879环亚手机|首页主页

Study on Balanced Energy-consumption Routing Protocol of Airfield Single-lamp Monitoring System5Wjag8879环亚手机|首页主页

Gao Mei, Wang Bingyuan, Zhang Dandan, Sun Zhaorong5Wjag8879环亚手机|首页主页

(School of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China)5Wjag8879环亚手机|首页主页

Abstract: To extend the sensor node lifetime and balance the energy consumption of the wireless sensor network, on the basis of the protocols AL-CAME (Airfield lighting-clustering algorithm based on max energy) and ECOMP (Efficient cluster-based communication protocol), a clustered hierarchy protocol of balanced energy-consumption was proposed for the airfield single-lamp monitoring system. According to the protocol, every two sensor nodes formed a cluster, and the node with the highest remaining energy was elected to be cluster head which was responsible for data aggregation within the cluster. The balanced routing algorithm was adopted in data-transmission from cluster head to the base station. Simulation results show that the balanced energy-consumption routing protocol decreases the node energy consumption, balances the energy consumption of all the nodes in the wireless network, and prolongs the network lifetime.5Wjag8879环亚手机|首页主页

Keywords: wireless network; airfield lighting; energy balance; balanced routing5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于多业务的卫星光网络波长路由算法研究5Wjag8879环亚手机|首页主页

刘庆利1,2,姚俊飞1,2,刘治国1,25Wjag8879环亚手机|首页主页

(1.通信与网络重点实验室(大连大学),大连 1166222.大连大学信息工程学院,大连 116622)5Wjag8879环亚手机|首页主页

摘要:针对卫星光网络拓扑高动态变化、业务类型多样化、负载不均衡等特点导致的波长利用率不高、路由收敛慢和效率低等问题,提出一种基于多业务类型的卫星全光网络波长路由算法。该算法将卫星网络划分区域,并在区域内进行链路更新,提高路由收敛速度;通过对不同业务分配不同的波长集,满足不同业务的要求;根据波长剩余数和传输时延的综合初始权重,并动态改变链路权重,实现网络负载均衡和资源的合理利用。MEO/LEO双层卫星网络模型下对提出算法进行仿真,结果表明:与传统算法比较,在网络拥塞率方面最高降低了20%,在波长利用率方面最高提高了10%,在成功请求数方面最高提高了10%5Wjag8879环亚手机|首页主页

关键词:卫星光网络;波长路由;链路权重;负载均衡5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1780-095Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080185Wjag8879环亚手机|首页主页

Research on Wavelength Routing Algorithm Based on Multi-service in Satellite Optical Networks5Wjag8879环亚手机|首页主页

Liu Qingli1,2, Yao Junfei1,2, Liu Zhiguo1,25Wjag8879环亚手机|首页主页

(1. Communication and Network Laboratory (Dalian University), Dalian 116622, China; 2. School of Information Engineering, Dalian University, Dalian 116622, China)5Wjag8879环亚手机|首页主页

Abstract: An optical wavelength routing algorithm for satellite networks based on multi-service was proposed, in order to solve the problem of low utilization rate of wavelengths, slow convergence and low efficiency of satellite optical networks. In this algorithm, it divided the area of the satellite network and updated the link in the area to improve the convergence speed of algorithm. Different services were assigned different wavelength sets to satisfy requirement of different service. According to the initial link weight, which included wavelength remain number and transmission delay, it changed link weight dynamically to achieve network load balancing and rational use of resources. In the MEO/LEO double-layer satellite optical networks, the simulation results show that the maximum rate of network congestion is reduced by 20% compared with the Traditional algorithm. The maximum rate of wavelength utilization is increased by 10%, and the number of successful requests increased by 10%.5Wjag8879环亚手机|首页主页

Keywords: satellite optical networks; wavelength routing; link weighting; load balancing5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

改进阈值函数在振动信号降噪中的仿真研究5Wjag8879环亚手机|首页主页

孙红星,张洋5Wjag8879环亚手机|首页主页

(辽宁科技大学电子与信息工程学院,辽宁 鞍山 114051)5Wjag8879环亚手机|首页主页

摘要:有效滤除机械振动信号中的噪声干扰成分能够更明确地观察振动信号特征,因此在小波阈值降噪方法的基础上提出一种改进的新阈值函数,该方法通过基于峭度值的阈值选取方法对机械振动信号经小波变换后的小波系数进行估计,新阈值函数不仅符合振动信号的分布特征,并且新阈值函数在阈值点处是连续的,克服了传统阈值函数所具有的固有偏差,通过对仿真信号以及实测机械振动信号的降噪处理研究,表明基于改进的阈值函数的小波降噪方法很好地保护了振动信号的有用信息,是一种有效的振动信号降噪方法。5Wjag8879环亚手机|首页主页

关键词:小波降噪;阈值函数;机械振动;故障诊断5Wjag8879环亚手机|首页主页

中图分类号:TP301.6????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1788-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080195Wjag8879环亚手机|首页主页

Improved Threshold Function Simulation Research in Vibration Signal Denoising5Wjag8879环亚手机|首页主页

Sun Hongxing, Zhang Yang5Wjag8879环亚手机|首页主页

(School of Electronic and Information Engineering University of Science and Technology, Anshan 114051, China)5Wjag8879环亚手机|首页主页

Abstract: Filtering noise component of mechanical vibration signal effectively can observe the characteristics of vibration signal more clearly. So based on the wavelet threshold de-noising method, a new improved threshold function was proposed. The coefficient of wavelet transform mechanical vibration signals were estimated by the threshold selection method based on kurtosis value. Not only new threshold function conforms to the distribution characteristics of the vibration signal, but also new threshold function is continuous in the threshold point. And the new threshold function overcomes the inherent deviation which traditional threshold function brings. The research of noise reduction on the simulation signal and measured mechanical vibration signal shows that wavelet de-noising method based on the improved threshold function protects the useful information of vibration signal well, and provides the method is a kind of effective de-noising method in vibration signal.5Wjag8879环亚手机|首页主页

Keywords: wavelet denoising; threshold function; mechanical vibration; fault diagnosis5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

水中颗粒-颗粒和颗粒-气泡间引力的分子动力学仿真5Wjag8879环亚手机|首页主页

骆庆群,杨洁明5Wjag8879环亚手机|首页主页

(太原理工大学新型传感器与智能控制教育部与山西重点实验室,太原 030024)5Wjag8879环亚手机|首页主页

摘要:通过分子动力学模拟的方法建立了疏水颗粒之间、疏水颗粒与气泡之间相互作用的模型,阐明了疏水表面间和疏水表面与气泡间纳米气泡桥的形成和消失过程,并定量计算了纳米气泡桥的作用距离和作用力大小。结果表明:溶解在水中的气体会在疏水表面吸附,当疏水颗粒彼此靠近到一定程度时,吸附在它们表面上的气体会相互连通形成纳米气泡桥;同样,当疏水颗粒和气泡接近到一定程度时,吸附在疏水颗粒表面的气体也会与气泡内的气体相互连通形成纳米气泡桥,纳米气泡桥是它们之间引力的根源。5Wjag8879环亚手机|首页主页

关键词:疏水作用;分子动力学模拟;纳米气泡桥;平均力势5Wjag8879环亚手机|首页主页

中图分类号:O56????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1795-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080205Wjag8879环亚手机|首页主页

Interaction of ParticleParticle and ParticleBubble in Water: Molecular Dynamics Simulation5Wjag8879环亚手机|首页主页

Luo Qingqun, Yang Jieming5Wjag8879环亚手机|首页主页

(Taiyuan University of Technology, Key Laboratory Advanced Transducers and Intelligent Control System, Ministry of Education, Taiyuan 030024, China)5Wjag8879环亚手机|首页主页

Abstract: Graphene and a bulk of gas were used to represent a part of particle and a part of bubble, respectively, and their interactions in liquid water with dissolved gas were simulated. Changes of the structural phase diagram, the gas density, and the potential of mean force were analyzed. The results show that the interactions of particle–particle and particle–bubble are both related to the nanobubble bridges therein. The forming processes of nanobubble bridges were shown in details. The range of nanobubble bridges and the energy change of the system were quantitatively calculated.5Wjag8879环亚手机|首页主页

Keywords: hydrophobic interaction; molecular dynamics; nanobubble bridge; potential of mean force5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

弹体斜侵彻混凝土过程中弹道偏转仿真分析5Wjag8879环亚手机|首页主页

薛建锋,沈培辉,王晓鸣5Wjag8879环亚手机|首页主页

(南京理工大学智能弹药技术国防重点学科实验室,江苏 南京 210094)5Wjag8879环亚手机|首页主页

摘要:针对弹体斜侵彻半无限混凝土过程中发生弹道偏转的问题,基于刚体运动学理论和动态空腔膨胀理论,建立了卵形弹侵彻混凝土靶的运动微分方程通过MATLAB编程和ANSYS-LYNA仿真得到弹体在给定不同侵彻初始条件下的侵彻深度和偏转角的变化规律。计算结果与试验结果吻合较好。结果表明,倾角越大,倾角对侵彻深度和偏转角的影响越明显;侵彻速度对弹道偏转的影响随着速度的增大呈现减小的趋势;卵形弹弹道偏转角小,抗弹道姿态劣化的能力强,侵彻弹道相对稳定性好。研究结果可为弹体对混凝土靶的斜侵彻弹道分析和弹体结构设计提供一定帮助。5Wjag8879环亚手机|首页主页

关键词:弹体;斜侵彻;混凝土靶;数值模拟;弹道偏转5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1801-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080215Wjag8879环亚手机|首页主页

Simulation Analysis on Ballistic Deflection of Projectile Obliquely Penetrating into Concrete5Wjag8879环亚手机|首页主页

Xue Jianfeng, Shen Peihui, Wang Xiaoming5Wjag8879环亚手机|首页主页

(ZNDY Ministerial Key Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China)5Wjag8879环亚手机|首页主页

Abstract: In order to study the trajectory deflection law of projectiles obliquely penetrating into concrete targets, based on the theory of rigid body kinematics and cavity expansion, the penetration motion differential equations of ogive-nosed projectile were established. The variation rules of trajectory offset and invasion depth were given in different initial conditions through the programming calculation and numerical simulation by MATALB and ANSYS-LYNA software. The calculation results agree well with experimental data. The results show that the influence of penetration depth and deflection angle increase with the oblique angle increasing. The influence of ballistic deflection decreases with the impact velocity increasing. The ballistic deflection of projectile with ogive-nose is smaller, its performance against the ballistic degradation is high and its penetration trajectory is stable. The research results can provide some help for the oblique penetration trajectory analysis and the design of the projectile.5Wjag8879环亚手机|首页主页

Keywords: projectile body; oblique penetration; concrete target; numerical simulation; ballistic deflection5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

一种高超声速飞行器组合导航故障检测方法5Wjag8879环亚手机|首页主页

李海林,张斌,吴德伟,卢虎5Wjag8879环亚手机|首页主页

(空军工程大学信息与导航学院,陕西 西安 710077)5Wjag8879环亚手机|首页主页

摘要:飞行器高超声速飞行时,多普勒频移增大,GNSS捕获跟踪易丢失,CNS也会造成光线传播误差,使天体跟踪出现问题。提出了一种高超声速飞行器残差χ2-Fuzzy ARTMAP快速神经网络INS/GNSS/CNS组合导航故障检测方法,给出了高超声速飞行器INS/GNSS/CNS组合导航系统故障诊断原理,推导了残差χ2检验法的检测函数公式和Fuzzy ARTMAP快速神经网络原理算法,研究了残差χ2-Fuzzy ARTMAP快速神经网络组合导航故障检测实现方法。仿真结果表明该检测方法比传统残差χ2检验法更准确及时有效实现故障检测和隔离,并且得到的姿态、位置和速度信息精度更高,提高了临近空间高超声速飞行器INS/GNSS/CNS组合导航体系的精度和可靠性。5Wjag8879环亚手机|首页主页

关键词:临近空间高超声速飞行器;组合导航;故障检测;残差χ2检验法;Fuzzy ARTMAP神经网络5Wjag8879环亚手机|首页主页

中图分类号:V448????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1809-065Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080225Wjag8879环亚手机|首页主页

A Way of Integrated Navigation Fault Detection of Near Space Hypersonic Cruising Aircraft5Wjag8879环亚手机|首页主页

Li Hailin, Zhang Bin, Wu Dewei, Lu Hu5Wjag8879环亚手机|首页主页

(Telecommunication Engineering Institute, Air Force Engineering University, Xi'an 710077, China)5Wjag8879环亚手机|首页主页

Abstract: The doppler shift is augmented, that causes acquisition and tracking of GNSS losing, error of CNS’s ray propagation also causes the problem of celestial body tracking when aircraft is hypersonically flighting. A way of INS/GNSS/CNS integrated navigation fault detection of the hypersonic cruising aircraft based on the residual chi-square-Fuzzy ARTMAP (Adaptive Resonance Theory Map) fast neural networks was proposed. The fault diagnostic elements of INS/GNSS/CNS integrated navigation system of the hypersonic cruising aircraft were given; the detection function formula of residual chi-square test and Fuzzy ARTMAP fast neural networks arithmetic was deduced; the realizing way was studied. The results demonstrate that the test way is available and feasible, and the navigation precision and reliability are improved.5Wjag8879环亚手机|首页主页

Keywords: near space hypersonic cruising aircraft; integrated navigation; fault detection; residual chi-square test; fuzzy ARTMAP neural networks5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

无线传感网络中的物理层安全问题探讨5Wjag8879环亚手机|首页主页

郭剑岚1,陈俞强1,2*,刘怡俊25Wjag8879环亚手机|首页主页

1.东莞职业技术学院,广东 东莞 5238082.广东工业大学,广东 广州 5100065Wjag8879环亚手机|首页主页

摘要:由于无线传感网中的传感节点受限于计算能力,电源能量、以及存储空间,如何确保无线传感网络的通信安全成为亟待破解的研究难点。基于此,旨在探讨如何应用压缩感知技术来保障无线传感网络的通信安全, 针对放大转发式压缩感知技术下的无线传感网络安全问题给出了安全可靠的通信信号重构算法,并且推导得到了压缩感知保密技术下的保密容量门限值。另外给出了无线传感网络不同节点参数条件下的无线传感网络保密容量的定量化分析。仿真结果进一步验证了所提安全通信方案的有效性。5Wjag8879环亚手机|首页主页

关键词:无线传感网络;压缩感知;物理层安全;分布式策略;保密容量5Wjag8879环亚手机|首页主页

中图分类号:TN929????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1815-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080235Wjag8879环亚手机|首页主页

Study on Secrecy Capacity of Wireless Sensor Networks5Wjag8879环亚手机|首页主页
Based on Amplify-and-Forward Compressed Sensing Scheme
5Wjag8879环亚手机|首页主页

Guo Jianlan1, Chen Yuqiang1,2*, Liu Yijun25Wjag8879环亚手机|首页主页

(1. Dongguan Polytechnic, Dongguan 523808, China; 2. Guangdong University of Technology, Guangzhou 510006, China)5Wjag8879环亚手机|首页主页

Abstract: Due to the limitation of wireless sensor nodes on computation, power energy and storage space, the security issue has become a prevalent concern in the wireless communication. A deep insight on the secrecy capacity of wireless sensor network based on the Amplify-and-Forward (AF) compressed sensing scheme was offered providing a corresponding calculable capacity threshold. Moreover, a feasible algorithm based on augmented Lagrange method for the reconstruction of communication signals was proposed. Furthermore, the impact of the secrecy capacity was discussed to various numbers of active sensor nodes, relay nodes and eavesdropper nodes. Simulation results demonstrate the validity of the provided scheme.5Wjag8879环亚手机|首页主页

Keywords: wireless sensor networks; compressed sensing; physical layer security; distributed strategy; secrecy capacity5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

多用户不可信放大转发无线中继网络安全性能分析5Wjag8879环亚手机|首页主页

邓单1,周雯25Wjag8879环亚手机|首页主页

(1. 广州番禺职业技术学院,广东 广州 5114832. 南京林业大学,江苏 南京 210037)5Wjag8879环亚手机|首页主页

摘要:针对放大转发无线中继网络,对直接链路和中继链路进行联合设计,研究不可信中继节点对系统安全截断概率(SOPsecrecy outage probability)性能的影响。根据不同的选择准则,最佳用户被选中,在不可信中继节点的协助下,最佳用户向目标用户发送信号。为减少信息泄漏,基于直接链路和中继链路的信道状态信息条件,我们提出三种不同的选择准则,并且推导了不同准则下SOP的解析式及其渐近表达式。数值仿真对比了三种准则下系统的SOP性能,给出了各自的分集增益阶数,验证了理论分析。5Wjag8879环亚手机|首页主页

关键词:安全截断概率;放大转发;中继网络;用户选择5Wjag8879环亚手机|首页主页

中图分类号:TN 802 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 08-1822-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080245Wjag8879环亚手机|首页主页

Performance Analysis on Multiuser Untrusted Amplify-and-Forward Relay Networks5Wjag8879环亚手机|首页主页

Deng Dan1, Zhou Wen25Wjag8879环亚手机|首页主页

(1. Guangzhou Panyu Polytechnic, Guangzhou 511483, China; 2. Nanjing Forestry University, Nanjing 210037, China)5Wjag8879环亚手机|首页主页

Abstract: The effect of the untrusted relaying node was investigated on the secrecy outage probability (SOP) of amplify-and-forward (AF) relay networks in the presence of direct links and multiple users. In the considered system, the best user was selected according a certain criterion. It transmitted signals to the destination node with the aid of the untrusted relaying node. To reduce the useful information leakage, three selection criteria were proposed based on the channel state information of the direct and/or relaying link. The closed-form analytical SOP and the corresponding asymptotic expressions were derived. Computer simulation was conducted to validate the theoretical analysis. The SOP performance with the proposed three criterions was compared and their respective diversity orders were proposed.5Wjag8879环亚手机|首页主页

Keywords: secrecy outage probability; amplify-and-forward; relay networks; user selection5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于数据的SecRPSO-SVM短期电力负荷预测5Wjag8879环亚手机|首页主页

孙海蓉1,谢碧霞1,2,田瑶1,2,李卓群15Wjag8879环亚手机|首页主页

(1. 华北电力大学控制与计算机工程学院,保定 0710032. 华北电力大学河北省发电过程仿真与优化控制工程技术研究中心,保定 071003)5Wjag8879环亚手机|首页主页

摘要:针对支持向量机在建模中的参数选取问题,提出一种二阶振荡和带斥力因子的粒子群优化算法优化支持向量机参数。采用非线性递减权重平衡算法的全局和局部搜索能力,二阶振荡因子保持种群多样性,提高全局搜索能力。斥力因子使粒子在搜索空间均匀分布,避免陷入局部最优。针对电力负荷的非线性、时变性、受多因素影响的复杂特点,提出一种基于数据的支持向量机预测模型,综合考虑天气、时间因素、历史负荷对预测结果的影响。仿真表明该方法可以建立短期电力负荷的有效高精度预测模型。5Wjag8879环亚手机|首页主页

关键词:支持向量机;粒子群算法;二阶振荡;斥力因子;数据分析;短期电力负荷5Wjag8879环亚手机|首页主页

中图分类号:TP391 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 08-1829-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080255Wjag8879环亚手机|首页主页

Forecasting of Short-term Power Load of SecRPSO-SVM Based on Data-driven5Wjag8879环亚手机|首页主页

Sun Hairong1, Xie Bixia1,2, Tian Yao1,2, Li Zhuoqun15Wjag8879环亚手机|首页主页

(1. School of Control and Computer Engineering, North China Electric Power University, Baoding 071003, China; 2. Hebei Engineering Research Center of Simulation & Optimized Control for Power Generation, North China Electric Power University, Baoding 071003, China)5Wjag8879环亚手机|首页主页

Abstract: For the parameter selection of support vector machine in modeling, a particle swarm optimization algorithm based on second-order oscillation and repulsion factor was proposed to optimize the parameter of SVM. The algorithm employed the nonlinear decreasing weight to balance the global and local search ability. Second-order oscillation factor could maintain the population diversity. The repulsion factor was introduced to make the swarm even distribution in search space, which could avoid local optimum. For the complex characteristics of nonlinearity, time-varying and multifactorial of electric power load, a support vector machine forecasting model based on data was proposed, and the influence of weather, time and historical load on the forecast results was considered. Simulation results show that the proposed method can be used to build an effective and high precision short-term power load forecasting model.5Wjag8879环亚手机|首页主页

Keywords: support vector machine; particle swarm optimization; second-order oscillation; repulsion factor; data analysis; short-term load forecasting5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

过渡季节太阳能跨季节蓄能的研究5Wjag8879环亚手机|首页主页

刘龙5Wjag8879环亚手机|首页主页

(青岛理工大学,山东 青岛 266033)5Wjag8879环亚手机|首页主页

摘要:对于热负荷占优的建筑气候区,年复一年的冬夏负荷不平衡会导致土壤源热泵机组的能效比COP (Coefficient of Performance)越来越低。过渡季节利用地埋管进行太阳能跨季节蓄能可有效地解决土壤热平衡问题。以一个实际工程为支撑,开展了跨季节蓄能的实践,并基于TRNSYS16模拟软件对过渡季节的蓄热过程进行模拟,结合实验数据验证了模型正确性并对模拟结果进行修正。结果表明,模拟数据与实测数据非常接近;过渡季节进行太阳能跨季节蓄能是可行的。5Wjag8879环亚手机|首页主页

关键词:土壤源热泵;跨季节蓄热;TRNSYS模拟;过渡季节5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1837-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080265Wjag8879环亚手机|首页主页

Study for Solar Seasonal Storage System in Transition Season5Wjag8879环亚手机|首页主页

Liu Long5Wjag8879环亚手机|首页主页

(Qingdao Technological University, Qingdao 266033, China)5Wjag8879环亚手机|首页主页

Abstract: The COP (Coefficient of Performance) of the GSHP system has decreased gradually year after year caused by imbalance energy loads especially in heating-dominated climate zones. The solar thermal energy storage system in transition season can solve the problems effectively. The practice of solar seasonal storage was carried out and supplied by a practical project. TRNSYS 16 was used to simulate the solar energy storage experiment process. The correctness of the model was verified by the experimental data and the simulation results were corrected. Results shows that the simulated results and the measured data were well matched with each other and it is feasible to perform the solar thermal energy storage process in transition season.5Wjag8879环亚手机|首页主页

Keywords: GSHP system; seasonal solar energy storage; TRNSYS simulation; transition season5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于回声状态网络的机械臂的视觉伺服控制5Wjag8879环亚手机|首页主页

李国友,苏侠飞,秦晓磊,史香雪5Wjag8879环亚手机|首页主页

(燕山大学工业计算机控制工程河北省重点实验室,秦皇岛 066004)5Wjag8879环亚手机|首页主页

摘要:由于机械臂本身的非线性和强耦合性,使得在研究机械臂控制问题的时候不得不考虑由此而带来的模型不确定项的问题。针对机械臂系统模型中的不确定项部分,将回声状态网络引入到机械臂的视觉伺服控制系统中。利用回声状态网络对系统的不确定项部分进行辨识,从而在控制律中实现对该部分的补偿,最终实现机械臂的定位控制利用MATLAB仿真软件对系统进行仿真,仿真结果与没有使用回声状态网络的系统进行比较。结果表明,回声状态网络能很好地对系统的不确定项进行辨识,并通过对不确定项的补偿,使系统能更快达到期望要求。5Wjag8879环亚手机|首页主页

关键词:回声状态网络;视觉伺服;机械臂;MATLAB仿真5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1845-065Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080275Wjag8879环亚手机|首页主页

Robotic Manipulator’s Visual Servo Control Based on Echo State Networks5Wjag8879环亚手机|首页主页

Li Guoyou, Su Xiafei, Qin Xiaolei, Shi Xiangxue5Wjag8879环亚手机|首页主页

(Key Laboratory of Industrial Computer Control Engineering of Yanshan University, Qinhuangdao 066004, China)5Wjag8879环亚手机|首页主页

Abstract: The inaccuracy in robotic manipulator modeling, which due to the nonlinear and strong coupling of robotic manipulator itself, cannot be ignored on the study of the robotic manipulator control problem. Aiming at the inaccuracy in robotic manipulator modeling, this study led echo state network in the visual servo control system of robotic manipulator. In order to achieve the robotic manipulator positioning control, this study used the echo state network to identify inaccurate item and compensates the uncertainties of the model in the control law. The simulation model of the simulated system was built with MATLAB simulation software. The results, compared with the visual servo system without echo state network, the echo state network can well identify the inaccuracy in robotic manipulator modeling. The system can quickly achieve the desired requirements with compensate the uncertainties of the model.5Wjag8879环亚手机|首页主页

Keywords: echo state network; visual servo; robotic manipulator; MATLAB simulation5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于广义正则化的ECT图像重建算法5Wjag8879环亚手机|首页主页

马敏,郭琪,闫超奇5Wjag8879环亚手机|首页主页

(中国民航大学电子信息与自动化学院,天津 300300)5Wjag8879环亚手机|首页主页

摘要:针对电容层析成像(Electrical Capacitance TomographyECT)系统图像重建过程中Tiknonov正则化引起的解的过度光滑和奇异值分解算法引起的数值不稳定,提出了一种更为广义的正则化算法。利用正定矩阵对正则化目标函数的惩罚相修正,使其可以对包含非光滑性信息的图像进行更准确重构,在目标函数求解过程中引入对角权值矩阵,对基于l2范数的数据项改进,通过重建图像质量、图像相对误差、图像相对系数等指标对3种算法进行评估。实验结果表明,广义正则化算法相比Tiknonov正则化算法和奇异值分解算法,可以对物场中不同介质有效区分,避免图像的过度平滑,分辨率较高,重建质量较好。5Wjag8879环亚手机|首页主页

关键词:电容层析成像;过度光滑;正定矩阵;广义正则化算法;图像重建5Wjag8879环亚手机|首页主页

中图分类号:TN911.73 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 08-1851-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080285Wjag8879环亚手机|首页主页

ECT Image Reconstruction Algorithm Based on Generalized Regularization5Wjag8879环亚手机|首页主页

Ma Min, Guo Qi, Yan Chaoqi5Wjag8879环亚手机|首页主页

(College of Electronic Information and Automation, Civil Aviation University of China, Tianjin 300300, China)5Wjag8879环亚手机|首页主页

Abstract: Aiming at the numerical instability caused by the singular value decomposition algorithm and the over-smooth caused by the Tiknonov regularization in the image reconstruction of electrical capacitance tomography (ECT) system, a more generalized regularization algorithm was proposed. The penalty phase of the regularized objective function was modified by the positive definite matrix so that it could reconstruct the image with non smooth information, In the process of solving the objective function, the diagonal weight matrix was introduced, and the data items based on l2-norm were improved. By comparing the image quality, the relative error of the image and the relative coefficient of the image, the three algorithms were evaluated. Results show that the generalized regularization algorithm compared to Tiknonov regularization algorithm and singular value decomposition algorithm, can distinguish the substance field in different medium effectively and obtain high quality reconstruction images while avoiding over-smooth.5Wjag8879环亚手机|首页主页

Keywords: electrical capacitance tomography; over-smooth; positive definite matrix; generalized regularization algorithm; image reconstruction5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

基于电流源的超高频感应加热电路仿真分析5Wjag8879环亚手机|首页主页

马莽原,石新春,王慧,孟建辉5Wjag8879环亚手机|首页主页

(华北电力大学,河北 保定 071003)5Wjag8879环亚手机|首页主页

摘要:固态超高频感应加热电源的主电路决定了电源的工作频段、工作方式和输出功率,选择一种合适的主电路对电源有决定性的影响。在参考E类电路和Boost升压斩波电路的基础上,采用能量守恒和傅里叶分解的方法,深入分析了一种新的电流源并联谐振电路的工作原理,解析了该电路各个参数之间的数学关系,为该电路的应用提供了理论依据针对不同的参数,利用Matlab/Simulink进行仿真,得出各个参数不同取值时的仿真波形,通过仿真波形得到的信息与理论分析进行对比,可以得知仿真结果完全符合理论分析,同时得到该电路达到最优工作状态的条件,证明了该电路的实用性5Wjag8879环亚手机|首页主页

关键词:电流源;并联谐振;超高频;感应加热;仿真5Wjag8879环亚手机|首页主页

中图分类号:TP391.9 ??????文献标识码:A?????? 文章编号:1004-731X (2017) 08-1858-085Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080295Wjag8879环亚手机|首页主页

Simulation and Analysis of Ultra High Frequency Induction Heating Circuit Based on Current Source5Wjag8879环亚手机|首页主页

Ma Mangyuan, Shi Xinchun, Wang Hui, Meng Jianhui5Wjag8879环亚手机|首页主页

(North China Electric Power University, Baoding 071003, China)5Wjag8879环亚手机|首页主页

Abstract: The operating frequency range, operating mode and output power are determined by the circuit. A suitable circuit is very important for induction heating power supply. On the basis of Class-E and Boost Chopper circuit, a new current source was analyzed with parallel resonant load circuit by energy conservation law and Fourier decomposition, which derived mathematical relation among the parameters and provided application theory. This circuit was studied by using Matlab/Simulink with variable parameters, which obtained the operating waves with different parameters and values. Comparing the operating waves with the theoretical analysis, the simulation results are completely consistent with the theoretical analysis, which obtains optimal working conditions and indicates circuit applicability.5Wjag8879环亚手机|首页主页

Keywords: current source; parallel resonant; ultra-high-frequency; induction heating; simulation5Wjag8879环亚手机|首页主页

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面向服务的航空指挥与保障作业流程建模方法5Wjag8879环亚手机|首页主页

罗永亮,秦远辉5Wjag8879环亚手机|首页主页

(中国船舶工业系统工程研究院,北京 100094)5Wjag8879环亚手机|首页主页

摘要:结合典型装备航空指挥和保障综合仿真系统构建需求,针对航空指挥和保障复杂作业流程特点,提出了一种面向服务的航空指挥和保障作业流程建模方法。系统分析了当前航空指挥和保障作业流程存在的问题,在现有复杂作业流程建模方法基础上,给出了面向服务的复杂作业流程建模方法,重点从作业流程概念元模型、流程形式化描述机制等方面进行了研究,结合所开发的原型工具对所提出的方法进行了应用分析。5Wjag8879环亚手机|首页主页

关键词:航空保障;流程建模;形式化描述;面向服务5Wjag8879环亚手机|首页主页

中图分类号:TP391.9????? 文献标识码:A?????? 文章编号:1004-731X (2017) 08-1866-075Wjag8879环亚手机|首页主页

DOI: 10.16182/j.issn1004731x.joss.2017080305Wjag8879环亚手机|首页主页

Modeling Method of Air Command and Security Work Process Service Oriented5Wjag8879环亚手机|首页主页

Luo Yongliang, Qin Yuanhui5Wjag8879环亚手机|首页主页

(China State Shipbuilding Corporation System Engineering Research Institute, Beijing 100094, China)5Wjag8879环亚手机|首页主页

Abstract: A modeling method of air command and security work process service oriented was proposed combined with the typical process equipment air command and support building requirements. Air command and process characteristics was analyzed systematically. On this basis, a complex process modeling method was proposed. From the concept of process meta-model, process formalized description mechanism was studied. A prototype flow modeling tool was developed, and the rationality of the proposed method was analyzed combined with the application example.5Wjag8879环亚手机|首页主页

Keywords: aviation security; flow modeling; formal description; service oriented5Wjag8879环亚手机|首页主页

※※※※※※※※※※※※※※※※※※※※※※※※※※※※※※5Wjag8879环亚手机|首页主页

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