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Feasibility study on electromagnetic tomography system using GMR sensors

Feasibility study on electromagnetic tomography system using...

引用

2011 2nd International Conference on Mechanic automation and control engineering, MACE 2011

作者： Wang, Chao Li, Fanwei Tianjin Key Laboratory of Process Measurement and Control School of Electrical and Engineering Automation Tianjin University Tianjin China

ISBN: (纸本)9781424494392

In this paper, theory of Giant MagnetoResistance (GMR) effect was described. And a detection circuit for GMR sensors was designed. The detection circuit was tested respectively at constant magnetic field and time-varying magnetic field. Based on the results of experiments, the feasibility of the Electromagnetic Tomography (EMT) system using GMR sensors was analyzed. The difficulties and the questions in the work of the EMT system using a GMR sensor were summed up and some advices for future work were put forward. © 2011 IEEE.

关键词： Tomography

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Nonlinear adaptive regulation control of a quadrotor unmanned aerial vehicle

Nonlinear adaptive regulation control of a quadrotor unmanne...

引用

IEEE Conference on control Technology and Applications (CCTA)

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

In this paper, a nonlinear adaptive regulation controller is presented for a class of underactuated quadrotor unmanned aerial vehicle (UAV). The vehicle's dynamics is subject to modeling impression associated with the inertia matrix, aerodynamic damping coefficients, and some other system parameters. The on-line parameter estimation scheme is combined with feedback control to develop the adaptive control laws. Lyapunov based approaches are utilized to prove that the quadrotor UAV's position and yaw angle regulation errors are ultimately driven to zero under parametric uncertainties. Simulation results are included to demonstrate the performance of the control strategy.

关键词： Adaptation models Aerodynamics Adaptive control Stability analysis control design Vehicle dynamics Parameter estimation

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Three-dimensional simulation study of liquid turbine flow sensor

Three-dimensional simulation study of liquid turbine flow se...

引用

International Conference on Electrical and control engineering (ICECE)

作者： Wenliang Yang Lijun Sun Tao Zhang Tianjin key Laboratory of Process Measurement and Control School of Electrical Engineering & Automation Tianjin University Tianjin China

With the turbine flow sensor applications increasingly widespread, the requirements of the turbine flow sensor accuracy are also higher. In this paper, the simulation model was built in strict accordance with the experimental 15 mm diameter turbine flow sensor's geometric structure with careful grid resolutions. Five kinds of turbulence models, including standard k-ω, SST k ω, RNG k-ε, Realizable k-ε and RSM, were used in three dimensional simulation of 15 mm diameter liquid turbine flow sensor and compared with the experimental data. The results showed that the relative error of the average meter factor between simulation and experimental results can reach 2.6% level. RNG k-ε and RSM model can more exactly predict the sensor's linearity. Standard k-ω can be more exact for the prediction of the meter factor of the sensor. The friction torque between the shaft and bearings obtained by theoretical formula has little effect on the turbine flow sensor simulation accuracy.

关键词： Turbines Torque Rotors Friction Mathematical model Accuracy Shafts

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Design of electrostatic velocimetry correlator used in gas-solid two-phase flow

Design of electrostatic velocimetry correlator used in gas-s...

引用

2011 2nd International Conference on Mechanic automation and control engineering, MACE 2011

作者： Wang, Chao Zhang, Zenghui Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China

ISBN: (纸本)9781424494392

The velocity of solid particles in gas-solid two-phase flow is an important parameter, which can reflect the flow condition of gas-solid two-phase flow. However, it is difficult to be measured. The electrostatic sensor combined with correlation technique provides a proper solution to the velocity measurement of gas-solid two-phase flow. The digital signal controller dsPIC33F, which has the advantages of MCU and DSP, had been used in the design of embedded correlator. This correlator has the advantages of simple structure, good real-time performance, high reliability and low power consumption. Through the experiments on the belt electrostatic induction apparatus, this system can meet the requirement of the velocity measurement of gas-solid two-phase flow. © 2011 IEEE.

关键词： Velocity measurement

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A new double frequency exciting mode for the electromagnetic flowmeter

A new double frequency exciting mode for the electromagnetic...

引用

2011 International Conference on Electric Information and control engineering, ICEICE 2011

作者： Tang, Shizhong Dong, Feng Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China

ISBN: (纸本)9781424480395

A new double frequency and rectangular waveform exciting mode is proposed, as to overcome the disadvantage of the current mode. The designed waveform is made up of two kinds of frequencies, the high frequency of 75Hz and the low frequency of 6.25Hz. The high frequency is used to reduce the interference from flow noise. The low frequency is introduced to keep the stabilization of zero. The design is established by using the FPGA and DDS technology. A 10-bit D/A converter and VVCS circuit are adopted to change the voltage signal from FPGA for a current one. The design consists of a power amplification circuit as well, which has a function of magnifying the output current and boosting the ability of load. The characteristics of the new exciting mode are analyzed in details, and the design of the hardware and software is introduces. The experimental result indicates that once the new exciting mode is established, the error of differential inference and orthogonal inference can be reduced greatly. Besides, the measurement accuracy is improved at the same time. © 2011 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Stochastic stability and stabilization of discrete-time Markovian jump systems in the presence of incomplete knowledge of transition probabilities

Stochastic stability and stabilization of discrete-time Mark...

引用

Chinese control Conference (CCC)

作者： Yijing Wang Yunna Sun Zhiqiang Zuo Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University 300072 China

This paper is concerned with the stability analysis and controller design for a class of discrete-time Markovian jump systems subject to incomplete knowledge of transition probabilities. Different from the previous results, some free-weighting matrices are introduced to obtain some new criteria with less conservatism. It is theoretically shown that the previous results are special cases if the free-weighting matrices are chosen to be some special forms. This brings much less conservatism compared with the previous ones. A numerical example is provided to show the effectiveness the proposed method.

关键词： Markov processes Symmetric matrices Linear systems Power system stability Robustness Stability criteria

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A kind of Electrical Resistance Tomography system

A kind of Electrical Resistance Tomography system

引用

2011 International Conference on Electric Information and control engineering, ICEICE 2011

作者： Zhang, Zhiqiang Dong, Feng Xu, Cong Ren, Shangjie Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China

ISBN: (纸本)9781424480395

As a kind of on-line measurement technology possessing advantages of unperturbed, non-radiant and visualization, Electrical Resistance Tomography has wide application prospect in petroleum and chemical industrial production processes which are based continuous-phase conductive medium. For extracting information of the production processes efficiently, a kind of 16 electrodes ERT system based the industrial CompactPCI Bus and FPGA technology is designed. The new system is tested in laboratory, the speed of the system can reach more than 1300 frame/s at the 100kHz sine wave injecting signal, even faster at higher frequency, the Signal-to-Noise ratio of the system can reach above 73dB, and the tomography speed can reach 60 frames/s with pre-iteration algorithm based on the Landweber method. © 2011 IEEE.

关键词： Signal to noise ratio

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Mass action realizations of reaction kinetic system models on various time scales

Mass action realizations of reaction kinetic system models o...

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作者： Hangos, K.M. Szederkényi, G. Process Control Research Group Computer and Automation Reseach Institute Kende u. 13-17 Budapest H-1111 Hungary Department of Electrical Engineering and Information Systems University of Pannonia Egyetem u. 10 Veszprém Hungary

Complex chemical reaction networks often exhibit different dynamic behaviour on different time scales. A combined approach is proposed in this work for determining physically meaningful mass action realizations of complex chemical reaction networks that describe its dynamic behaviour on different time scales. This is achieved by appropriately reducing the detailed overall mass action kinetic scheme using quasi steady state assumptions fit to the particular time scale, and then searching for an optimal realization using mixed integer linear programing. Furthermore, the relationship between the properties (reversibility, deficiency, stability) of the obtained realizations of the same system on different time scales are also investigated and related to the same properties of the detailed overall model. It is shown that the reduced models obtained by quasi steady state assumptions may show exotic nonlinear behaviour, such as oscillations, when the original detailed is globally asymptotically stable. The proposed methods are illustrated by using a simple Michaelis-Menten type reaction kinetic example. The simplified versions of the well known Brusselator model have also been investigated and presented as a case study. © Published under licence by IOP Publishing Ltd.

关键词： Reaction kinetics

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Influence of droplet diameter on vortex flow meter in steam flow measurement

Influence of droplet diameter on vortex flow meter in steam ...

引用

International Conference on Mechanic automation and control engineering (MACE)

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

ISBN: (纸本)9781424494361

As an important secondary energy, steam is widely used in engineering for its role of heat transfer and mechanical transmission. But steam is a complex medium, its state easily changes as the working condition changes, thus causes measurement error. Based on the present situation, a theoretical analysis has been made on vortex flow meter, which proved that the error was related to steam dryness. Numerical simulations were made to verity that measuring accuracy was related to the droplet diameter condensed out from the steam.

关键词： Fluid flow measurement automation Computational fluid dynamics Numerical simulation Time frequency analysis Energy 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

2011 International Conference on Consumer Electronics, Communications and Networks, CECNet 2011

作者： Shengjie, Li Lijun, Sun Lixiao, Qi Lei, Qi 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

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. © 2011 IEEE.

关键词： Flow of gases

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