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Simulation of sensing field for electromagnetic tomography system

Simulation of sensing field for electromagnetic tomography s...

引用

International Conference on Electric Information and control engineering (ICEICE)

作者： Yan Fu Feng Dong Chao Tan Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Electromagnetic tomography has potential value in process measurement. The frontier of electromagnetic tomography system is the sensor array. Owing to the excited signal acting on the sensor array directly, the excited strategy and the frequency and amplitude of the signal affect the quality of the information that the detected coil acquired from the object space. Furthermore, it would affect the accuracy of the information post extracted from the object field. To improve the sensitivity of the sensor array on the changes of the object field distribution, upgrade the sensitivity and accuracy of the system and guarantee high precision and high stability of the experimental data, use the finite element simulation software COMSOL Multiphysics to analyze the excited strategy and the characteristic of the excitation frequency of electromagnetic tomography. Establish the foundation in optimal using of electromagnetic tomography system.

关键词： Magnetic field measurement Coils Sensitivity Sensors Tomography Electromagnetics Voltage measurement

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Development of a gas flow calibration facility by master meter method

Development of a gas flow calibration facility by master met...

引用

International Conference on Consumer Electronics, Communications and Networks

作者： Li Shengjie Sun Lijun Qi Lixiao Qi Lei Zhang Tao School of Electrical Engineering & Automation Tianjin Key Laboratory of Process Measurement and Control Tianjin University TJU Tianjin China

ISBN: (纸本)9781612844589

In this paper, a gas flow calibration facility by master meter method is developed. The paper deals with the design methods and working principle. The simulation of the confluence tube is analyzed. The pressure loss of pipe is calculated and the selection of the blower is analyzed. And then the distribution of the facility uncertainty is calculated. The uncertainty is better than 1% in the total flow range, and it is better than 0.5% at the fixed flow points.

关键词： Fluid flow measurement Instruments Fluid flow Calibration Uncertainty Publishing Electron tubes

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Design and realization of gas-solid two-phase flow standard facility

Design and realization of gas-solid two-phase flow standard ...

引用

International Conference on Mechanic automation and control engineering (MACE)

作者： Chao Wang Yulin Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Gas-solid two-phase flow is complicated and random, gas-solid two-phase flow standard facility is a very important method for the study of gas-solid two-phase flow problem. As to the design requirements of standard fa... 详细信息

ISBN: (纸本)9781424494361

关键词： Electrostatics Electrostatic measurements Atmospheric measurements Electrical engineering Particle measurements Velocity measurement automation

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Design and implement of water-flow calibration facilities

Design and implement of water-flow calibration facilities

引用

International Conference on Consumer Electronics, Communications and Networks

作者： Qi Lei Sun Lijun Zhang Tao Li Shengjie Liu Yi School of Electrical Engineering & Automation of Tianjin Key Laboratory of Process Measurement and Control Tianjin University TJU Tianjin China

In this paper, a design of water-flow calibration facilities was proposed which was based on static mass method, static volume method and master meter method. Taking the water-flow calibration facility of Tianjin University Flow laboratory for an example, this paper specified the experiment pipeline design, buoyancy and density correction, control system design, and other key issues. At last an uncertainty analysis of the facility was provided, and the experiment data showed the combined standard uncertainty of this facility was 0.0243% used static mass method and 0.0559% used master meter method.

关键词： Uncertainty Calibration Valves Pipelines Switches Fluid flow measurement

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Development of flow stability experimental platform on water flow calibration facility

Development of flow stability experimental platform on water...

引用

International Conference on Consumer Electronics, Communications and Networks

作者： Xiang, Qiu Lijun, Sun Bao, Li Tao, Zhang School of Electrical Engineering and Automation Tianjin University Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072 China

ISBN: (纸本)9781612844572

To study the flow stability of the flow calibration facility under different pressure stabilizing methods, analyze the influencing factors, and improve it. The paper develops a flow stability experimental platform. The flow range of it is 0.04∼4 m3/h, the uncertainty of it is better than 0.05% (k=2). It proves that experimental platform works well and can reflect the difference of the flow stability under different pressure stabilizing methods according to the results of experiment on them. © 2011 IEEE.

关键词： Calibration

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High-precision electrical resistance tomography with external and internal electrode arrays

High-precision electrical resistance tomography with externa...

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IEEE Instrumentation and Measurement Technology Conference

作者： Shangjie Ren Feng Dong Chao Tan Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

Electrical resistance tomography is considered as a promising tomography technology in many industry processes. Classical ERT usually reconstructs internal resistivity distribution from the measurements on the surface. Its spatial resolution, especially near the center of the reconstructed domain, is limited by the relatively low numbers of independent measurements positions and the soft-field character of electrical field. To improve this condition, a novel ERT sensor structure with eight internal electrodes and sixteen external electrodes is presented in this paper. The internal electrodes are attached on a bluff body across the object pipe, and the external electrodes are fixed on the inner wall. Under some excitation strategy, these internal and external electrodes can be utilized as current injections and voltage measurements. After some numerical simulations, some advantages of this novel structure have been found. Firstly, the sensitivity field of this novel structure is more homogeneous comparing with the classical structure. Secondly, more information about the observed field can be obtained using this novel structure. Finally, reconstruction results from this novel structure have lower average errors and are more correlated with the actual distributions. Therefore the high-precision electrical resistance tomography can be got using this novel ERT sensor structure.

关键词： Electrodes Image reconstruction Voltage measurement Current measurement Tomography Conductivity Pollution measurement

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A nonlinear adaptive control approach for quadrotor UAVs

A nonlinear adaptive control approach for quadrotor UAVs

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Asian control Conference

作者： Chen Diao Bin Xian Qiang Yin Wei Zeng Haotao Li Yungao Yang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

In this paper, a continuous, time varying adaptive controller is developed for an underactuated quadrotor unmanned aerial vehicle (UAV). The vehicle's dynamic model is subject to uncertainties associated with mass, inertia matrix, and aerodynamic damping coefficients. A Lyapunov based approach is utilized to ensure that position and yaw rotation tracking errors are ultimately driven to a neighborhood about zero that can be made arbitrary small. Simulation results are included to illustrate the performance of the control strategy.

关键词： Aerodynamics Vehicle dynamics Trajectory USA Councils Adaptation model Damping Adaptive control

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Research of magnetic suspension technology for the reformation of turbine flow meter

Research of magnetic suspension technology for the reformati...

引用

International Conference on Consumer Electronics, Communications and Networks

作者： Yinping Jiang Haili Zhang Shan Liu Lei Wang School of Electrical Engineering and Automation Tianjin Key Laboratory of Process Measurement and Control Tianjin University TJU Tianjin China

This paper introduces a new-type turbine flow meter. The concept is to apply magnetic suspension bearing to reform turbine flow meter. Beginning with the structure and working principle of magnetic suspension bearing, the magnet suspension bearing is compared with the common bearing in their differences and characteristics. To draw a conclusion from the comparison that the turbine flow meter based on magnetic suspension bearings superiors to the one with common bearings, and the problems in the application of magnetic suspension bearing are introduced at the same time. Numerous experiments show that the range of measurement can be largely widened and the working life span of turbine flow meters also can be extended with magnetic suspension bearings.

关键词： Turbines Magnetic levitation Suspensions Impellers Fluid flow measurement Magnetoelectric effects Magnetic flux

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A method of measuring two phase flow based on segmented capacitance electrodes

A method of measuring two phase flow based on segmented capa...

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IEEE Instrumentation and Measurement Technology Conference

作者： Zhiqiang Zhang Feng Dong Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

A kind of measurement called “step” measurement method based on segmented capacitance electrodes is proposed in this paper. The “step” measurement method is implemented through increasing and reducing the width by increasingly involving more the capacitance electrodes towards different axis directions. By this kind of measurement, the information of the flow both locally and globally can be acquired. The capacitance electrode model and the measurement method are presented in details. Based the simulations using finite element method, the relative capacitance differences are calculated. The gas-liquid cross-sectional phase distribution (annular flow, stratified flow, bubble flow) are identified. Besides, the relation between the mean relative capacitance differences and the level of the water of stratified flow is nearly linear. The “step” measurement data contains a lot of information of the flow, and further work will focus on the feature extraction method of “step” measurement data.

关键词： Electrodes Capacitance Capacitance measurement Fluid flow measurement Capacitive sensors Charge measurement

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A fully-automatic higher precision apparatus for angular displacement calibration

A fully-automatic higher precision apparatus for angular dis...

引用

International Conference on Consumer Electronics, Communications and Networks

作者： Ge Lijun Zhang Tao Xu Ying School of Electrical Engineering & Automation Tianjin Key Laboratory of Process Measurement and Control Tianjin University TJU Tianjin China

ISBN: (纸本)9781612844589

Based on a higher raster angular displacement sensor, a fully-automatic higher precise apparatus for angular calibration is described. By using a higher resolution stepping motor, both of the two types of sensors, the standard raster sensor and the corrected sensor which are fixed in the same axial, can rotate coaxially at the same step. Meanwhile, the related software application platform is developed, which is being used for angular calibration and angular detecting. The output signals from the standard and corrected sensors can be transmitted to a host computer via one COM port. Take a kind of smart angular displacement sensor for calibration example, its angular displacement mathematic model embedded in MCU can be corrected by using this apparatus with higher accuracy so that the technique specification, like basic errors and linearity error can be improved greatly. For the four capacitive angular displacement sensors, their calibrating results sensors show that the averaged basic errors are 0.19%, 0.16%, 0.12% 0.15% respectively and the maximum is 0.62%, and the averaged linearity errors are 0.15% 0.12% 0.10% 0.14% respectively, and the maximum is 0.58% The accuracy of 1.0 level of this capacitive angular displacement sensor can be obtained.

关键词： Calibration Linearity Presses Displacement measurement Transducers Publishing Light emitting diodes

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