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4th International Conference on advanced engineering Materials and technology, AEMT 2014

作者： Song, Meng Zhang, Yi Deng, Xu Zhi Liu, Hao Hu, Nan Nan Ren, Li Shen, Shi Feng Yunnan Electric Power Research Institute Kunming China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9783038352068

The AC loss calculation is crucial for the thermal analysis of the High Temperature Superconducting (HTS) magnet. Generally, the critical state model is used to calculate the AC loss value of the HTS conductor with Finite Element Method (FEM). The mesh of the model have a large impact both on the convergence and the accuracy in calculation processes. In this paper, we investigate the effect of different meshes on the AC loss calculation of HTS conductors using a second generation tape model. Both triangular and quadrangle element with fix number of elements and predefined distribution type meshes have been used. The results illustrates that quadrangle with geometric sequence is the best choice when calculating the AC loss in HTS tape. © (2014) Trans Tech Publications, Switzerland.

关键词： Superconducting magnets

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Thermal annealing of C ion irradiation defects in nuclear graphite studied by positron annihilation

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Journal of Physics: Conference Series 2016年第1期674卷

作者： C Q Shi H Schut Z C Li State Key Lab of New Ceramic and Fine Processing School of Materials Science & Engineering Tsinghua University Beijing China Department of Radiation Science and Technology Delft University of Technology Mekelweg 15 2629 JB Delft the Netherlands Key Laboratory of Advanced Materials (MOE) School of Materials Science & Engineering Tsinghua University Beijing China To whom any correspondence should be addressed.

In order to investigate the thermal behaviour of radiation induced point defects in nuclear graphite, ETU10 graphite was implanted with 350 keV C+ ion to doses of 1015 and 1016 cm-2. The point defects introduced by the implantation were characterized by Positron Annihilation Doppler Broadening (PADB) and their thermal behaviour was studied during 'in situ' annealing at Delft Variable Energy Positron beam (VEP). The annealing was performed for 5 minutes at temperatures ranging from 300 K (as implanted) to 1500 K in steps of 100 K. For both doses, an annealing stage at around 450 K is observed followed by a second stage around 700 K. For the high dose implantation vacancy complexes are found which are stable up to a temperature around 1400K.

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The establishment of wind farm dynamic Co-simulation platform and influence analysis of wind conditions

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Diangong Jishu Xuebao/Transactions of China Electrotechnical Society 2014年 29卷 356-364页

作者： Zhuo, Yixin Xu, Lüyang Lin, Xiangning State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

With the development and utilization of wind power, wind turbine trip-off and damage accidents has occurred frequently because of the severe wind conditions, having adverse impacts on the stability and safety operation of power grid. Therefore, it is necessary to establish an appropriate model for wind farm operation analysis considering various wind conditions. Through combining on Digsilent and Matlab, this paper established a dynamic wind farm simulation platform with three parts of wind condition, wind turbine and fatigue respectively. Based on this platform, a variety of standard wind conditions with wake effects can be formulated, and their electric influence and fatigue damage on wind turbines can be analyzed in detail. The simulation platform is validated through a demo wind farm, and the influence of wind conditions is evaluated. ©, 2014, Diangong Jishu Xuebao/Transactions of China Electrotechnical Society. All right reserved.

关键词： Wind turbines

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Oscillator death induced by amplitude-dependent coupling in repulsively coupled oscillators

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Physical Review E 2015年第5期91卷 052902-052902页

作者： Weiqing Liu Guibao Xiao Yun Zhu Meng Zhan Jinghua Xiao Jürgen Kurths School of Science Jiangxi University of Science and Technology Ganzhou 341000 People's Republic of China State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and Mathematics Chinese Academy of Sciences Wuhan 430071 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China School of Science Beijing University of Posts and Telecommunications Beijing 100876 China Institute of Physics Humboldt University Berlin Berlin D-12489 Germany Potsdam Institute for Climate Impact Research Telegraphenberg Potsdam D-14415 Germany

The effects of amplitude-dependent coupling on oscillator death (OD) are investigated for two repulsively coupled Lorenz oscillators. Based on numerical simulations, it is shown that as constraint strengths on the amplitude-dependent coupling change, an oscillatory state may undergo a transition to an OD state. The parameter regimes of the OD domain are theoretically determined, which coincide well with the numerical results. An electronic circuit is set up to exhibit the transition process to the OD state with an amplitude-dependent coupling. These findings may have practical importance on chaos control and oscillation depression.

关键词： DYNAMICAL systems CHAOS synchronization PHASE transformations (Physics) LORENZ equations COUPLING constants (Nuclear physics) AMPLITUDE estimation

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Welding behavior in making and breaking operations of electrical contacts 27

Welding behavior in making and breaking operations of electr...

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27th International Conference on Electrical Contacts, ICEC 2014

作者： Wang, Qian Liu, Chun Wu, Xixiu Li, Zhenbiao Du, Liu Liu, Jinyou Yang, Xiaocheng State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China School of Automation Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783800736249

To clarify where the exact position of dynamic welding occurrence is, electrical endurance tests are conducted with AgSnO2, AgNi and AgCdO contacts. Waveforms of contact force, displacement, voltage and current are recorded with labview during tests, which can make it out whether welding occurs during breaking or making operation. The experimental results shows welding may occur in breaking as well as in making operations, possible mechanism for welding in break is discussed. © 2014 VDE VERLAG GMBH. All rights reserved.

关键词： Welding

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Multi-pipeline System Scheduling under Demand Uncertainty

Multi-pipeline System Scheduling under Demand Uncertainty

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第26届中国过程控制会议（CPCC2015）

作者： Wang Jishuai Gu De Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences State Key Lab.of Industrial Control Technology Institute of Cyber-systems and Control Zhejiang University Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Institute of Automation Jiangnan University

In this paper, a discrete mathematical approach to solve scheduling of multi-pipeline systems for petroleum products under demand uncertainty is presented. To deal with the uncertainty, the conditional value-at-risk(CVAR) analysis is adopted as a risk measure. Firstly an improved scheduling approach is proposed to model the multi-pipeline system with the consideration of different pipeline segment sizes. The improved formulation is computationally intractable when pipeline segments have distinct capacities. Then the model takes a scenario-based approach to cope with uncertainty in a CVAR framework. Computational results are presented to demonstrate the effectiveness of the proposed approach. All the instances are implemented using CPLEX.

关键词： Multiproduct pipeline Scheduling MILP formulation Pump

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Research on peak load regulation demand of power system with large-scale wind power integration

Research on peak load regulation demand of power system with...

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3rd International Conference on Energy and Environmental Protection, ICEEP 2014

作者： Xu, Jian Fei Shao, Jian Zhang, Bu Han Yu, Peng Zhang, Kai Min Jin, Bin Jie Ge, Teng Yu Dai, Xiao Kang Deng, Wei Si State Grid Jibei Electric Power Company Limited Beijing 100053 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9783038351344

In china, increasing large-scale wind power integration has brought much more peak load regulation demand, which is the bottleneck of the integration of wind power to systems. This paper analyzed the influence mechanism of large-scale wind power on peak load regulation demand. And critical indicators are constructed based on the daily peak-valley difference to evaluate peak load regulation demand caused by wind power integration. Statistical analyses based on large number of actual dates reflect the influence of large-scale wind power integration on peak load regulation demand, which can help provide more decision-making information for planning and operation. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind power

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The effect of guide sleeves on shear behavior of 3D weaving composites

The effect of guide sleeves on shear behavior of 3D weaving ...

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3rd International Conference on advanced Materials Design and Mechanics (ICAMDM)

作者： Wu, Xiaochuan Shan, Zhongde Liu, Feng Wang, Yuan State Key Lab of Advanced Forming Technology and Equipment of China China Engineering Research Institute of University Science and Technology Beijing China

ISBN: (纸本)9783038351771

In this study, guide sleeves are brought into 3D weaving composite preforms. The process vacuum assisted resin infusion (VARI) was used to fabricate the 3D weaving composite with guide sleeves. The load-deflection curves and shear behaviors of the 3D weaving composites with guide sleeves were obtained by means of the 3-point bending test. The fracture micrographs of the materials were studied by SEM. The effects of guide sleeves' diameter and interval on the shear behavior and fracture mechanisms of the 3D weaving composites were analyzed. The results showed that the guide sleeves could prevent delamination effectively by bridging fiber layer and pinning crack extending along the fiber layer. Fracture toughness of the composite parts increase because of deformation, fracture of guide sleeves and debonding of interface. The diameter and interval of guide sleeves is smaller, which means the volume fraction of guide sleeves is higher, the interlaminar shear strength higher for the bridging is stronger.

关键词： 3D weaving composite Guide sleeve Short-beam shear strength Delamination 3-point bending test

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Analysis of the asymmetry of railgun system 17

Analysis of the asymmetry of railgun system

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2014 17th International Symposium on electromagnetic Launch technology, EML 2014

作者： Zizhou, Su Wei, Guo Tao, Zhang Kai, Huang Ming-Tao, Li Xiaochao, Sun Northwest Institute of Mechanical and Electrical Engineering Xian yang Shaanxi712099 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9781479927333

The reasons and the performance of the dissymmetry of the armature-rail system were studied. The current distribution and its force the dissymmetry of Armature or rail in C-shaped armature were analyzed by finite-element method. The calculation was performed with a monolithic armature. As a preliminary study on the dissymmetry of Armature-rail system, a 40 mm square-bore railgun with an asymmetrical travel-length of 1800 mm was fabricated and tested. Launch experiments were conducted to verify the analysis results. The current density distribution and force in reclaimed armature was analyzed. It was found that the dissymmetry of Armature-rail system affect the performance of railgun. © 2014 IEEE.

关键词： Rail guns

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A Landmark Calibration Based IP Geolocation Approach

A Landmark Calibration Based IP Geolocation Approach

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International Conference on Availability, Reliability and Security, ARES

作者： Jingning Chen Fenlin Liu Xiangyang Luo Fan Zhao Guang Zhu State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Science and Technology Institute Zhengzhou Henan China State Key Lab. of Math. Eng. & Adv. Comput. Zhengzhou Sci. & Technol. Inst. Zhengzhou China

ISBN: (纸本)9781467365918

Aiming at the existing IP geolocation approaches does not consider the errors of landmarks, a new geolocation approach utilized landmark calibration is proposed in this paper. At first, by assigning a deviation, the location of the landmark with low reliability is regarded as a possible area, then geolocating the target IP can be converted into a constrained optimization problem, finding the location estimation of target IP by solving this problem, as well as the real deviation of landmark. The algorithm analysis and experimental results show that, when a landmark is not located in its claimed position, our geolocation approach can still give a location for the target IP.

关键词： Geology Delays IP networks Probes Optimization Calibration Propagation delay

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