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作者： Guan, Yonggang Cai, Yuanji Chen, Weijiang Liu, Weidong Li, Zhibing Yue, Gongchang Zhang, Junmin State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing100084 China State Grid Corporation of China Beijing100031 China China Electric Power Research Institute Beijing100192 China School of Automation Science and Electrical Engineering Beihang University Beijing100191 China

Very fast transient over-voltage (VFTO), induced by disconnector operations in gas-insulated switchgears, has become the limiting dielectric stress at ultra-high voltage levels. Much work has been done to investigate single-strike waveforms of VFTO. However, little study has been carried out investigating the repeated strike process, which would influence VFTO significantly. In this paper, we carried out 450 effective experiments in an ultra-high voltage test circuit, and conducted calculations through the Monte Carlo simulation method, to investigate the repeated strike process. Firstly, the mechanism of the repeated strike process is proposed, based on the experimental results. Afterwards, statistical breakdown characteristics of disconnectors are obtained and analyzed. Finally, simulations of the repeated strike process are conducted, which indicate that the dielectric strength recovery speed and polarity effect factor have a joint effect on VFTO. This study enhances the understanding of the nature of VFTO, and may help to optimize the disconnector designed to minimize VFTO.

关键词： Monte Carlo methods

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A self-decoupling piezoresistive sensor for measuring microforce in horizontal and vertical directions

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Journal of Micromechanics and Microengineering 2016年第9期26卷

作者： Zhou, Jie Rong, Weibin Wang, Lefeng Gao, Peng Sun, Lining State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang China School of Electrical and Control Engineering Heilongjiang University of Science and Technology Harbin Heilongjiang China

This paper presents the design, fabrication and calibration of a novel two-dimension microforce sensor with nano-Newton resolution. The sensor, mainly composed of a clamped-clamped beam (horizontal detecting beam), an overhanging beam (vertical detecting beam) and a half-folded beam, is highly sensitive to microforces in the horizontal (parallel to the probe of the designed sensor) and vertical (perpendicular to the wafer surface) directions. The four vertical sidewall surface piezoresistors (horizontal piezoresistors) and two surface piezoresistors (vertical piezoresistors) were fabricated to achieve the requirements of two-dimension microforce measurements. Combining the sensor structure with Wheatstone bridge configurations, the microforce decoupling among the x, y, and z direction can be realized. Accordingly, the sensor is capable of detecting microforces in the horizontal and vertical directions independently. The calibration results verified that the sensor sensitivities at room temperature are 210.58 V N-1and 159.2 V N-1 in the horizontal and vertical directions, respectively. Additionally, the sensor's corresponding force resolutions are estimated at 2 nN and 3 nN in theory, respectively. The sensor can be used to measure the contact force between manipulating tools and micro-objects, in fields such as microassembly and biological assays. © 2016 IOP Publishing Ltd.

关键词： Calibration

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Consensus control for Second-Order Multi-Agent with Time-Delay on Antagonistic Networks

Consensus Control for Second-Order Multi-Agent with Time-Del...

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第35届中国控制会议

作者： Penglin LI Yue LIU Yadong ZHAO Jie YANG Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University State Key Laboratory of Industrial Control Technology Institute of Industrial Process ControlCollege of Control Science and EngineeringZhejiang University Key Laboratory of System Control and Information Processing Ministry of Education

ISBN: (纸本)9781509009107

In this paper,we discuss consensus problems for antagonistic networks with double integrator *** cases are analyzed:(1) undirected graphs with fixed topology on antagonistic networks;(2) undirected graphs with fixed topology and time-delay on antagonistic *** both cases,distributed consensus protocols are proposed,with sufficient and necessary conditions *** is proved that the largest tolerable time-delay is only related to the largest eigenvalue of the graph ***,simulations are provided to demonstrate the obtained theoretical results.

关键词： Consensus Fixed Topology Multi-agent Antagonistic Networks Time-delay

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Enhancing BEM simulations of a stalled wind turbine using a 3D correction model

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Journal of Physics: Conference Series 2018年第1期974卷

作者： Galih Bangga Go Hutomo Taurista Syawitri Tri Kusumadewi Winda Oktavia Ahmad Sabila Herlambang Setiadi Muhamad Faisal Yongki Hendranata Dwi Lastomo Louis Putra Stefanus Kristiadi Ilmi Bumi Institute of Aerodynamics and Gas Dynamics University of Stuttgart Stuttgart Germany Mechanical Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia Toyota SO Department Astra International Ltd. Indonesia Mechanical Engineering Department Universitas Muhammadiyah Surakarta Surakarta Indonesia School of Manufacturing System and Mechanical Engineering Sirindhorn International Institute of Technology Thammasat University Thailand Project Support and Cost Control Division Indoturbine Ltd. Jakarta Indonesia Civil Engineering Department Universitas Brawijaya Malang Indonesia School of Information Technology & Electrical Engineering The University of Queensland Brisbane Australia Non-Installation Top Range Department Berca Schindler Lifts Ltd. Indonesia Graduate Institute of Automation and Control National Taiwan University of Science and Technology Taiwan Mechanical Engineering Department Texas A&M University College Station United States PUI-PT Mechatronics and Industrial Automation Research Center Intitut Teknologi Sepuluh Nopember Surabaya Indonesia Mechanical Engineering Department Politecnico di Milano Milan Italy Aeronautics Department Imperial College of Science Technology and Medicine London United Kingdom Materials Engineering Department Institut Teknologi Sepuluh Nopember Surabaya Indonesia

Nowadays wind turbine rotors are usually employed with pitch control mechanisms to avoid deep stall conditions. Despite that, wind turbines often operate under pitch fault situation causing massive flow separation to occur. Pure Blade Element Momentum (BEM) approaches are not designed for this situation and inaccurate load predictions are already expected. In the present studies, BEM predictions are improved through the inclusion of a stall delay model for a wind turbine rotor operating under pitch fault situation of -2.3° towards stall. The accuracy of the stall delay model is assessed by comparing the results with available Computational Fluid Dynamics (CFD) simulations data.

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Flexible polymer/multi-walled carbon nanotube composite sensor array equipped with microheater for gas sensing

Flexible polymer/multi-walled carbon nanotube composite sens...

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International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS)

作者： Chin-Cheng Wu Jin-Chern Chiou Yu-Ping Wang Li-Chun Wang Department of Electrical and Computer Engineering Institute of Electrical and Control Engineering National Chiao Tung University Hsinchu Taiwan Chemical System Research Division National Chung-Shan Institute of Science and Technology Taoyuan Taiwan

ISBN: (纸本)9781509015115

A polymer/multi-walled carbon nanotube (MWCNT) composite sensor array based on a flexible polyimide substrate equipped with a thermostatic microheater to provide different working temperatures was developed for gas sensing. The thermostatic microheater provided nine working temperatures ranging from 20°C to 60°C. Each microheater element included a 3 × 3 polymer/MWCNT composite sensor array, which is composed of MWCNTs and polymer composite, as a sensing material. The device was developed to investigate the effect of device temperature on the response of polymer/MWCNT composite gas sensor arrays. The response to ethanol at different temperatures showed resistance variation but similar performance for the proposed gas sensor array.

关键词： Polymers Temperature sensors Sensor arrays Gas detectors Films Carbon nanotubes

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Design and validation of hydraulic pump system driven by the electromotor under the high-power and long-time working state in an airborne

Design and validation of hydraulic pump system driven by the...

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IEEE International Conference on Aircraft Utility systems (AUS)

作者： Huijun Jiang Zhenshui Li Hong Liu Zongxia Jiao Yaoxing Shang Xiaochao Liu Department of Flight Control and Hydraulic System AVIC the First Aircraft Institute Xi'an China School of Automation Science and Electrical Engineering Beihang University Beijing China

ISBN: (纸本)9781509010882

This paper introduced a type of aircraft electric hydraulic pump system working principle, the key points of the system are analyzed and described, including calculation of boost pressure, system oil temperature control design, environmental temperature checking, starting logic design, the system validation and verification methods are expounded. This system passed through the ground test and flight time Validation, and worked well and reliably.

关键词： Oils Aircraft Aerospace control Hydraulic systems Heat transfer Resistance heating

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MoS2 heterostructure with tunable phase stability: Strain induced interlayer covalent bond formation

arXiv

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arXiv 2017年

作者： Ouyang, Bin Xiong, Shiyun Yang, Zhi Jing, Yuhang Wang, Yongjie National Center for Supercomputing Applications University of Illinois at Urbana-Champaign UrbanaIL61801 United States Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University Suzhou JiangSu215123 China College of Physics and Optoelectronics Taiyuan University of Technology Taiyuan ShanXi030024 China Key Lab of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi Province Taiyuan University of Technology Taiyuan ShanXi030024 China Department of Astronautical Science and Mechanics Harbin Institute of Technology Harbin Heilongjiang150001 China Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-Champaign UrbanaIL61801 United States Department of Electrical Engineering and Computer Engineering University of Michigan Ann ArborMI48109 United States

Due to the distinguished properties offered by different structural phases of monolayer MoS2, phase engineering design are urgently required for achieving switchable structural phase. Strain engineering is widely accepted as a clean and flexible method, however, can not be achieved in engineering monolayer MoS2 phase transition because the critical biaxial strain required (~15%) is much larger than measured elastic limit (~11%). In this study, employing density functional theoretical calculations, it has been found out that with the forming of heterostructure between MoS2 with buckled 2D materials such as silicence, germanene and stanene, only a small strain can trigger the phase transition. As being suggested by the constructed phase stability diagram, biaxial deformation as low as 3% in MoS2/silicene and MoS2/stanene sandwich structure, would be sufficient to induce the structural phase transition in MoS2 lattice. This strain falls well within experimental elastic limit, thus would be feasible to realize in experiment. The origin of such behavior can be understood as strain induced interlayer covalent bond formation, which finally make MoS2 lattice more sensitive to external strain. This theoretical work provides one realistic route for achieving flexible phase stabilities in experimental design. Copyright © 2017, The Authors. All rights reserved.

关键词： Molybdenum compounds

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The Review and Development of the Brake system for Civil Aircrafts

The Review and Development of the Brake System for Civil Air...

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2016 IEEE/CSAA International Conference on Aircraft Utility systems(AUS)

作者： Zehua Liu Zhenshui Li Cheng Qin Yaoxing Shang Xiaochao Liu Department of Flight Control & Hydraulic System AVIC The First Aircraft Institute Office of Chief Designer AVIC The First Aircraft Institute School of Automation Science and Electrical Engineering Beihang University

the brake system is meeting with an important opportunity and challenge with the research of the civil aircraft *** paper describes the main techniques of the brake system for the famous civil aircraft A380 and *** points out the developing trend of civil aircraft brake system,including the electric brake technology,the auto-brake technology,the advanced control law or control policy,the system integration technology,the redundant control,the fault detection,the system reconfiguration technology,the green taxiing control and the brake system auxiliary *** the difference of here and abroad advanced technology,some viewpoints about the development of aircraft brake system are proposed.

关键词： The Review and Development of the Brake system for Civil Aircrafts

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Optimization of carbon fiber bracket of clamping locking device for magnetically suspended flywheel

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Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis 2016年第4期36卷 708-715页

作者： Liu, Qiang Wu, Dengyun Fang, Jiancheng Fan, Yahong School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing102617 China Beijing Institute of Control Engineering Beijing100190 China Key Laboratory of Inertial Technology Beihang University Beijing100191 China National Defense Key Science Laboratory of Novel Inertial Instrument & Navigation System Technology Beihang University Beijing100191 China

A novel optimization method was presented according to the integral carbon fiber bracket of the clamping locking device for a magnetically suspended flywheel. To be equivalent to the cantilever beam model, static and dynamic analyses were performed for the carbon fiber bracket. Its five mechanics performances were obtained, including the maximum interference friction force, locking/unlocking force, the maximum bending stress and first resonance frequency. Sensitivity analysis of the carbon fiber bracket was carried out based on the finite element method. According to the analysis results, two groups of mutually independent structure parameters were obtained. From this, two parts of the carbon fiber bracket were separately optimized. The results show that the mass of the bracket has a minimum of 60.5 g corresponding to 12 slices, which is 64% less than the initial mass of 170 g. Based on optimal results, a locking device was manufactured and its protective effect for the magnetically suspended flywheel was verified by swept-sine vibration and random vibration. The verification shows that the maximum displacement between the stator and rotor is 50 μm, which is less than the flywheel system protective gap of 200 μm. This indicates that the locking device can effectively carry out the locking protection function for the flywheel system. © 2016, Editorial Department of JVMD. All right reserved.

关键词： Finite element method

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Design of an Online BCI system Based on CCA Detection Method 34

Design of an Online BCI System Based on CCA Detection Method

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第三十四届中国控制会议

作者： LIN Dongxue TAN Jeffrey Too Chuan ZHU Chi DUAN Feng College of Computer and Control Engineering NanKai University Institute of Industrial Science University of Tokyo Department of System Life Engineering Maebashi Institute of Technology

ISBN: (纸本)9781467374439

Recently, more and more SSVEP(steady-state visual evoked potential) based BCIs(brain-computer interfaces) are developed to control external devices such as robots and wheelchairs. There have been many different methods for detecting the presence of SSVEPs. In this paper, CCA(canonical correlation analysis) detection method and PSD(power spectral density) detection method are compared in offline experiments. Results show that CCA has a much better performance than PSD. Therefore, CCA detection method is used in the online SSVEP-based BCI system with three targets. Three subjects participated to control a virtual wheeled robot in SIGVerse simulation environment. All of the subjects were able to use this BCI system and achieving an average accuracy of 89.8%, 95.6%, 92.5% respectively.

关键词： Brain-computer interface,steady-state visual evoked potential,canonical correlation analysis,power spectral density,SIGVerse

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