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International Conference on High Voltage engineering and Application, ICHVE

作者： B. X. Du Li Wang J. W. Zhang Yong Liu Y Gao Key Laboratory of Power System Simulation and Control of Ministry of Education Department of Electrical Engineering School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Epoxy used as insulating material in electronic and electrical devices plays an important role in system reliability. Addition of nanoparticles into epoxy can improve the insulating properties compared with undoped material. However, due to the change of the material structure, trap characteristics and charge behaviors are altered as a consequence. This possibly leads to a great risk of electric field distortion and discharge that degrades the insulation. From the viewpoint of safety, it is necessary to investigate the charge behavior on epoxy nanocomposites. This paper presents study aimed at clarifying the effect of nano-filler content on surface charge accumulation and decay behaviors of epoxy nanocomposites with SiO 2 particles. Samples were prepared by dispersing nano-scale SiO 2 into epoxy by mixing with shear force. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the accumulated charge as well as the charge decay rate upon the concentration of SiO 2 , varying as a function of the charge polarity, charging time and charging voltage. It is suggested that the charge dynamics is dependent upon the characteristics of localized surface states that are altered by the nanoparticles.

关键词： Surface charging Nanocomposites Nanoparticles Electrodes Dielectrics Corona Space charge

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Research on the ground control system of quadrotor unmanned aerial vehicles

Research on the ground control system of quadrotor unmanned ...

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World Congress on Intelligent control and automation (WCICA)

作者： Tingting Zhao Bin Xian Yungao Yang Fang Guo Guoping Huang The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 China

The quadrotor unmanned aerial vehicle (UAV) has been a focus for unmanned aerial vehicles. Ground control system (GCS) is an important part of the quadrotor UAV flight control system, and it can promote the flight performance and safety of quadrotor UAVs. In this paper, a quadrotor UAV GCS is designed and implemented, and the GCS realizes the following functions, including receiving and storing of the flight data, the real-time localization utilizing the customization of electronic maps like MapX and Google Earth, the visual display of flight states via virtual instruments and the waypoint planning. Outdoor experiments have been done to verify the GCS's performance. It can be concluded that the proposed GCS in this paper can work stably, and it can guarantee the integrity of the flight data, the accuracy of the instruments display and map localization.

关键词： Google Earth Sockets Unmanned aerial vehicles XML HTML automation

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Data acquisition and processing of the onboard sensor system of a quadrotor unmanned aerial vehicle

Data acquisition and processing of the onboard sensor system...

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World Congress on Intelligent control and automation (WCICA)

作者： Fang Guo Bin Xian Haotao Li Guoping Huang Tingting Zhao The Institute of Robotics and Autonomous System the Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin 300072 China

In recent years, quadrotor helicopter has become a hotspot of the research about unmanned aerial vehicles (UAVs). The data acquisition of the vehicle's attitude and position in real time is important to achieve autonomous flight control for quadrotor UAVs. In this paper, an ARM embedded system is employed as the main controller, and an attitude heading reference system (AHRS) is utilized as the main onboard sensor. By using C++ programming under Linux operation system, the data acquisition and processing of the AHRS is implemented, and then the attitude and position data of the quadrotor UAV are obtained in real time to provide reliable flight state information for the autonomous flight control. The on-board flight data is sent to ground control system and stored via a communication module based on the UDP network protocol.

关键词： Linux Global Positioning system Data acquisition Process control Attitude control Servers automation

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Comparison between body fat measurements obtained by portable ultrasound and caliper in young adults

Comparison between body fat measurements obtained by portabl...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： L. Ulbricht E. B. Neves W. L. Ripka E. F. R. Romaneli Master Program in Biomedical Engineering Federal University of Technology Parana Brazil Electrical Engineering and Industrial Computing Program Federal University of Technology Parana Brazil Control and Automation Engineering Federal University of Technology Parana Brazil

The objective of this study was to compare and correlate the Portable Ultra Sound (US) measuring technique to the skinfold measuring technique (SF) to estimate body fat percentage (%F) in young adults. Sixty military were evaluated, all males, divided in two groups: Group 1 (normal) composed by 30 military with Body Mass Index (BMI) until 24.99 kg/m 2 and Group 2 (overweight) composed by 30 military with BMI >; 25 kg/m 2 . Weight, height, skinfolds and ultrasound were measured in 9 points (triceps, subscapular, biceps, chest, medium axillary, abdominal, suprailiac, thigh and calf). Body fat average values obtained by skinfold thickness and ultrasound measurements were 13.25 ± 6.32 % and 12.73 ± 5.95 % respectively. Despite significant differences in measurements of each anatomical site, it was possible to verify that the total final body fat percentage calculated by both techniques did not present significant differences and that overweight group presented greater similarity between the values obtained using caliper and ultrasound equipment.

关键词： Ultrasonic imaging Ultrasonic variables measurement Correlation Thigh Educational institutions Estimation Biomedical measurements

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Distributed Cooperative Tracking for Multiple Second-order Nonlinear systems Using Only Relative Position Measurements

Distributed Cooperative Tracking for Multiple Second-order N...

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The 24th Chinese control and Decision Conference (第24届中国控制与决策学术年会 2012 CCDC)

作者： Ziyang Meng Zongli Lin Department of Automation Shanghai Jiao Tong University and KeyLaboratory of System Control and Inf Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlott

In this paper, a distributed cooperative tracking problem is studied for a group of second-order nonlinear systems. The control goal is to drive the states of the followers to converge to those of a time-varying leader using only relative information. We focus on the case of the output feedback, where the velocities of the followers and the leader are not available. Two kinds of distributed observers are proposed for the cases when the follower dynamics are uniformly globally exponentially stable and the follower dynamics are continuously differentiable, respectively. Using the observer outputs, we design the control inputs such that the distributed cooperative tracking problem of multiple second-order nonlinear systems is solved under the constraint that only relative position measurements are available. Simulations are given to validate the theoretical results.

关键词： networked second-order nonlinear systems output feedback continuously differentiable

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Energy management strategy of islanded microgrid based on power flow control

Energy management strategy of islanded microgrid based on po...

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Innovative Smart Grid Technologies (ISGT)

作者： Ye Zhang Hong Jie Jia Li Guo Key Laboratory of Power System Simulation and Control of Ministry of Education Schoolof Electrical Engineering & Automation Tianjin University Tianjin China Tianjin University Tianjin Tianjin CN

As the remote areas can not be connected to large electric system, using local renewable resources and a certain capacity of energy storage devices to construct a microgrid for power supply will be the only choice. This paper introduces a new energy management strategy of islanded microgrid based on power flow control. The islanded microgrid utilizes the hybrid AC/DC structure. Battery storage system keeps the DC bus voltage constant, PV array as a current source is connected to the DC bus and a main DC/AC inverter in VF mode is used to provide the voltage and frequency references for the AC bus. In this energy management strategy, power flow control is applied to regulate the SOC of batteries in the certain range, control the batteries to avoid over-discharge/over-charge and frequent transition between charge and discharge by the means of output power limitation of the solar energy, switching wind turbine and controllable load and so on. The PSCAD test results show the feasibility and effectiveness of this energy management strategy.

关键词： Batteries Discharges (electric) Power generation system-on-a-chip Voltage control Partial discharges Arrays

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Design of multiple anti-windup loops for multiple activations

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Science China(Information Sciences) 2012年第9期55卷 1925-1934页

作者： WU XiongJun 1,2 & LIN Zongli 3,1 1 Department of automation,Shanghai Jiao Tong University,and Key Laboratory of system control and Information Processing,Ministry of Education of China,Shanghai 200240,China 2 No.802 Institute of Shanghai Academy of Space Flight Technology,the Eighth Academy of China Aerospace Science and Technology Corporation,Shanghai 200090,China 3 Charles L.Brown Department of electrical and Computer engineering,University of Virginia,P.O.Box 400743,Charlottesville,VA 22904-4743,USA 1. Department of Automation Shanghai Jiao Tong University and Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai 200240 China2. No. 802 Institute of Shanghai Academy of Space Flight Technology the Eighth Academy of China Aerospace Science and Technology Corporation Shanghai 200090 China3. Charles L. Brown Department of Electrical and Computer Engineering University of Virginia P.O. Box 400743 Charlottesville VA 22904-4743 USA

This paper considers anti-windup design for linear systems subject to actuator *** anti-windup gains are designed for activations immediately at the occurrence actuator saturation,after the saturation has reached a certain level and in anticipation of the occurrence of saturation,*** design is based on the minimization of L 2 gain from the disturbance to the controlled output of the resulting closed-loop *** anti-windup scheme involves a single anti-windup loop for immediate activation.A recent innovation is to design a single anti-windup loop for delayed or anticipatory activation,as well as to design two anti-windup gains,one for immediate activation and one for delayed *** design of three anti-windup gains for three different activations is shown through simulation to lead to significant further performance improvement over the previous activation schemes.

关键词： actuator saturation anti-windup anticipatory activation delayed activation L 2 gain nonlinear control

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BLOCK-BASED DECISION-FEEDBACK EQUALIZERS WITH REDUCED REDUNDANCY

BLOCK-BASED DECISION-FEEDBACK EQUALIZERS WITH REDUCED REDUND...

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European Signal Processing Conference

作者： Wallace A. Martins Paulo S. R. Diniz Federal Center for Technological Education Dept. of Control and Automation Industrial Eng. Federal University of Rio de Janeiro Depart. of Electronics and Computer Eng. Electrical Engineering Program

ISBN: (纸本)9781467310680

In recent years many works related to the design of block-based transceivers have been published. The main target of this research activity is to optimize the use of the spectral resources in broadband transmissions. A possible way to address this problem is to reduce the amount of redundancy required by block transmissions to avoid interblock interference. An efficient solution is to employ zero-padding zero-jamming (ZP-ZJ) transceivers, which allow the transmission with reduced redundancy. ZP-ZJ systems have been successfully employed in the context of linear transceivers. This paper shows how the ZP-ZJ concept can be applied in decisionfeedback equalization. Some performance analyses based on the resulting mean-square error and error probability of symbols are included to show the possible degrading effects of the reduction in the amount of redundancy. Nevertheless, simulation results illustrate that data throughput and average mutual information between transmitted and estimated symbols can be enhanced significantly without affecting the system performance, for a certain level of signal-tonoise ratio at the receiver.

关键词： Block DFE Reduced redundancy Throughput redundancy Transceivers Research Activities system performance Signs and symbols feedback equalizer data throughput Error probability Transmissions broadband

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Biophotogrammetry model of respiratory motion analysis applied to children

Biophotogrammetry model of respiratory motion analysis appli...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： W. L. Ripka D. da V. Ricieri L. Ulbricht E. B. Neves A. M. W Stadnik E. F. R. Romaneli Electrical Engineering and Industrial Computing Program Federal University of Technology Paraná Brazil Physical Education Department Federal University of Paraná Brazil Master Program in Biomedical Engineering Physical Education Federal University of Technology Paraná Brazil Control and Automation Engineering Federal University of Technology Paraná Brazil

This study aimed to test a protocol of measurements based on Biophotogrammetry to Analysis of Respiratory Mechanics (BARM) in healthy children. Seventeen normal spirometric children (six male and 11 female) were tested. Their performed maneuvers of forced inspiratory vital capacity were recorded in the supine position. The images were acquired by a digital camera, laterally placed to the trunk. Surface markers allowed that the files, exported to CorelDraw® software, were processed by irregular trapezoids paths. Compartments were defined in the thoracic (TX), abdominal (AB) and the chest wall (CW). They were defined at the end of an inspiration and expiration, both maximum, controlled by a digital spirometer. The result showed that the measured areas at the inspiratory and expiratory periods were statistically different (p

关键词： Muscles Educational institutions Lungs Member and Geographic Activities Board committees Biological system modeling Pediatrics Surface treatment

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Heterogeneity of organizing chance promotes cooperation in spatial public goods games

Heterogeneity of organizing chance promotes cooperation in s...

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第八届中国多智能体系统与控制会议(MASC'2012)

作者： Yongkui Liu Lin Zhang Xiaojie Chen Long Wang School of Automation Science and Electrical Engineering Beihang University - Beijing 100191China Sc School of Automation Science and Electrical Engineering Beihang University - Beijing 100191China Evolution and Ecology Program International Institute for Applied Systems Analysis(IIASA)- Schlosspl Center for Systems and Control State Key Laboratory for Turbulence and Complex SystemsCollege of En

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