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Journal of Zhejiang university-science A(Applied Physics & engineering) 2011年第12期12卷 950-956页

作者： Yong-jian ZHI Bin zhang Kai LI xiao-yan HUANG you-tong FANG wen-ping CAO College of electrical engineering Zhejiang University Hangzhou 310027 China State Key Lab of Fluid Power Transmission and control Zhejiang University Hangzhou 310027 China department of Information science and electronic engineering Zhejiang University Hangzhou 310027 China Newcastle university Newcastle upon Type NE1 7RU UK

A switched-mode unit used in electric locomotive generates a strong high frequency conducted electromagnetic interference (EMI),which radiates electromagnetic energy through railway *** of magnetic field using analytical technique based on contour integral is presented,in order to assess the electromagnetic environment around a high-speed *** railway multiconductor finitely long overhead lines are represented by an infinitely long single line above two-layered earth,whose characteristic is different from homogeneous *** to the constraint of the GB/T 24338-2009 and the high frequency investigated (a few MHz),only the magnetic fields are *** magnetic fields consist of four components:the direct wave,the ideal reflected wave or image wave,the trapped surface wave,and the lateral *** calculation results proved that due to the presence of the trapped surface wave,the magnetic field of the observer point on the interface is strongly influenced,when the line is on or closed to the interface.

关键词： Overhead lines Two-layered earth Trapped surface wave

Integrated resources planning in microgrids considering interruptible loads and shiftable loads

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 802-815页

作者： Lan ZHU Xueying ZHOU xiao-Ping zhang Zheng yan Shuxin GUO Longjun TANG department of electrical engineering Shanghai Jiao Tong University School of electrical engineering Shanghai University of Electric Power Pudong Power Supply Company State Grid Shanghai Municipal Electric Power Company School of electronic Electrical and Systems EngineeringUniversity of Birmingham Zibo Power Supply Company State Grid Shandong Electric Power Grid Company East electric Power Dispatch and control Sub-Center State Grid Corporation of China

Demand response has the potential to bring significant benefits to the optimal sizing of distributed generation(DG) resources for microgrids planning. This paper presents an integrated resources planning model considering the impact of interruptible loads(ILs) and shiftable loads(SLs) in microgrids, which simultaneouslydeals with supply side and demand side resources and minimizes the overall planning cost of the microgrid. The proposed model can be applied to offer a quantitative assessment how IL and SL can contribute to microgrid planning. The pure peak clipping model with IL and SL is also provided for comparisons. Moreover, sensitivity analysis of parameters in the model is *** results confirm that the proposed model is an effective method for reducing the planning cost of microgrids. It was also found that the major contributing factors of IL and SL have great impact on the economic benefits of the proposed model in low-carbon economy environments.

关键词： Interruptible load(IL) Shiftable load(SL) Integrated resources planning(IRP) Load control Microgrid

Analytic Mechanism for the Cumulative Effect of Wind Power Fluctuations from Single Wind Farm to Wind Farm Cluster

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1290-1301页

作者： Gang Mu Fangze Wu xiaoping zhang Ziheng Fu Bai xiao Key Laboratory of Modern Power System Simulation and control&Renewable Energy technology Ministry of Education(Northeast Electric Power University)Jilin 132012China department of electronic Electrical and Systems EngineeringSchool of EngineeringUniversity of BirminghamBirmingham B152TTU.K

The use of wind power is rapidly growing worldwide as a means of reducing carbon emissions for the energy *** has the world’s largest wind power installation and multiple large-scale wind farm clusters,each comprising dozens of wind *** the planning and operation of the power system,it is important to understand the power fluctuation characteristics of wind farm *** studies demonstrate that the relative power fluctuation of a wind farm cluster is less than that of a single wind *** this decreasing trend a random occurrence or does it have a regular pattern?This scientific question is addressed by investigating the mechanism of the cumulative effect of a wind farm *** this study,a cumulative model is proposed by examining the spatiotemporal relationships of wind power variations and wind farm *** gain function and critical cumulative frequency are defined as the foundations to analytically describing the cumulative *** investigating the cumulative effect mechanism,the relationship between power fluctuation and spatiotemporal parameters of the wind farm cluster are *** power fluctuation of a cluster can be predicted using the cumulative model even before it is completely *** mechanism of the cumulative effect is validated on the basis of the data of two actual wind farm clusters.

关键词： Analytic mechanism cumulative effect evolution regularity wind farm cluster wind power fluctuation

基于自适应线性自抗扰控制的飞机防滑刹车系统重构控制

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控制理论与应用 2022年第8期39卷 1516-1528页

作者：刘舒畅杨忠张钊陈爽张小恺南京航空航天大学自动化学院江苏南京211100 航空机电综合航空科技重点实验室电子工程部江苏南京211100

飞机防滑刹车系统是确保飞机安全起飞、着陆和滑跑的重要航空机电系统.除了其动力学中的强非线性、强耦合以及参数时变外,潜在的执行器等组件故障也会严重降低防滑刹车系统的安全性与可靠性.为满足故障及扰动状态下系统的性能需求,本文... 详细信息

飞机防滑刹车系统是确保飞机安全起飞、着陆和滑跑的重要航空机电系统.除了其动力学中的强非线性、强耦合以及参数时变外,潜在的执行器等组件故障也会严重降低防滑刹车系统的安全性与可靠性.为满足故障及扰动状态下系统的性能需求,本文提出了一种基于自适应线性自抗扰控制的飞机防滑刹车系统重构控制方法.根据飞机防滑刹车系统的组成结构及工作原理对其进行数学建模,并对执行器注入故障因子.设计了自适应线性自抗扰重构控制器,同时分析了整个闭环系统的稳定性.该控制器将组件故障、外部干扰以及测量噪声等视为总扰动,根据状态误差反馈和系统输出信息,利用BP神经网络在线优化更新扩张状态观测器和状态误差反馈律参数,从而更精确地观测与补偿总扰动带来的不利影响.最后,在不同跑道环境下的仿真结果验证了所提出重构控制器的适应性和鲁棒性.

关键词：飞机防滑刹车系统执行器故障自适应线性自抗扰控制 BP神经网络重构控制

Humanoid control of lower limb exoskeleton robot based on human gait data with sliding mode neural network

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CAAI Transactions on Intelligence technology 2022年第4期7卷 606-616页

作者： Jun Yu Shuaishuai zhang Aihui Wang Wei Li Zhengxiang Ma Xuebin Yue Zhongyuan‐Petersburg aviation College Zhongyuan University of TechnologyZhengzhouChina School of electric and Information engineering Zhongyuan University of TechnologyZhengzhouChina School of Intelligent engineering Zhengzhou University of AeronauticsZhengzhouChina department of electronic and computer engineering Ritsumeikan UniversityKusatsuShigaJapan

Lower limb exoskeleton robots offer an effective treatment for patients with lower extremity *** order to improve the rehabilitation training effect based on the human motion mechanism,this paper proposes a humanoid sliding mode neural network controller based on the human gait.A humanoid model is constructed based on the human mechanism,and the parameterised gait trajectory is used as target to design the humanoid control system for *** the imprecision of the robot dynamics model,the neural network is adopted to compensate for the uncertain part of the model and improve the model ***,the sliding mode control in the system improves the response speed,tracking performance,and stability of the control *** Lyapunov stability analysis proves the stability of the control system ***,an evaluation method using the similarity function is improved based on joint angle,velocity,and acceleration to evaluate the comfort of humans in rehabilitation training more ***,to verify the effectiveness of the proposed method,simulations are carried out based on experimental *** results show that the control system could accurately track the target trajectory,of which the robot is highly similar to the human.

关键词： robot neural network

双离子束溅射Al_(2)O_(3)高温绝缘薄膜的氧分压研究

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测控技术 2022年第12期41卷 8-12,35页

作者：闫博黄漫国郭林琪梁晓波张丛春上海交通大学电子信息与电气工程学院微纳电子学系上海200240 航空工业北京长城航空测控技术研究所先进传感器技术中心北京101111 状态监测特种传感技术航空科技重点实验室北京101111

采用双离子束溅射沉积法(DIBSD)制备了用作高温绝缘层的Al_(2)O_(3)薄膜,分析了所制备Al_(2)O_(3)薄膜的表面和截面形貌,研究了溅射氧分压对薄膜氧铝元素比的影响,并进一步探讨了氧铝元素比对Al_(2)O_(3)薄膜高温绝缘性能的影响。研究... 详细信息

采用双离子束溅射沉积法(DIBSD)制备了用作高温绝缘层的Al_(2)O_(3)薄膜,分析了所制备Al_(2)O_(3)薄膜的表面和截面形貌,研究了溅射氧分压对薄膜氧铝元素比的影响,并进一步探讨了氧铝元素比对Al_(2)O_(3)薄膜高温绝缘性能的影响。研究结果表明:双离子束溅射沉积法制备的Al_(2)O_(3)薄膜表面平整度高,粗糙度约为2.86 nm,截面形貌致密,没有微裂纹、空隙等缺陷;溅射氧分压的提高可以增加所制备Al_(2)O_(3)薄膜的氧铝元素比例,18%溅射氧分压下制备的Al_(2)O_(3)薄膜O∶Al约为1.44,接近Al_(2)O_(3)化合物的元素比;18%氧分压溅射的Al_(2)O_(3)薄膜,在1000℃具有6.5 MΩ的绝缘电阻值,高温绝缘性能良好。

关键词：双离子束溅射沉积法 Al_(2)O_(3)薄膜高温绝缘溅射氧分压氧铝元素比

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基于有限元模拟的薄膜热流计结构设计及优化

测控技术 2021年第11期40卷 11-15,32页

作者：张梅菊郭林琪黄漫国梁晓波张丛春刘冠华航空工业北京长城航空测控技术研究所先进传感器技术中心北京101111 上海交通大学电子信息与电气工程学院微纳电子学系上海200240 状态监测特种传感技术航空科技重点实验室北京101111

精确的热流测量对航空航天领域发动机设计及使用过程至关重要。薄膜热流计以其体积小、热容量小、干扰小、不破坏部件表面气流等显著优势,成为发动机热端部件表面热流测量的新方法。针对传统工程经验设计薄膜热流计精确度不高且迭代耗... 详细信息

精确的热流测量对航空航天领域发动机设计及使用过程至关重要。薄膜热流计以其体积小、热容量小、干扰小、不破坏部件表面气流等显著优势,成为发动机热端部件表面热流测量的新方法。针对传统工程经验设计薄膜热流计精确度不高且迭代耗时长的缺点,基于有限元仿真模拟方法,建立了一种薄膜热流计有限元分析模型,综合分析了热流密度、热阻层厚度、热电堆厚度等因素对热流计冷热结点温度梯度的影响,提出薄膜热流计优化思路。分析结果表明,优化后的薄膜热流计具有更出色的热学性能与电学性能。

关键词：薄膜热流计有限元热阻层温差