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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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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 flow stability experimental platform on water flow calibration facility

Development of flow stability experimental platform on water...

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International Conference on Consumer Electronics, Communications and Networks

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

ISBN: (纸本)9781612844589

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 m 3 /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.

关键词： Stability analysis Publishing Standardization Fluid flow measurement Calibration Inspection Fluid flow

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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...

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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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A fully-automatic higher precision apparatus for angular displacement calibration

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

引用

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

作者： Lijun, Ge Tao, Zhang Ying, Xu School of Electrical Engineering and Automation Tianjin University Tianjin Key Laboratory of Process Measurement and Control Tianjin 300072 China

ISBN: (纸本)9781612844572

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. © 2011 IEEE.

关键词： Calibration

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Boundary reconstruction of completely conductive inclusions by Electrical resistance tomography

Boundary reconstruction of completely conductive inclusions ...

引用

IEEE International Workshop on Imaging Systems and Techniques (IST)

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

Determining the boundary of inclusions within an opaque vessel sometimes is of more interest to academic research and industrial application than conductivity distribution when applying process tomography. This work focuses on reconstructing the boundary of completely conductive inclusions by Boundary Element Method with Electrical resistance tomography (ERT). The integral equations of forward problem are reformed since they are not identical as those for low conductivity. Inverse problem is solved with Levenberg-Marquardt (L-M) Algorithm. The results are verified with numerical simulations and errors have shown acceptable.

关键词： Conductivity Tomography Electrodes Integral equations Contact resistance Mathematical model Jacobian matrices

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Hilbert-Huang transform based electrostatic signal analysis for characterization of dilute gas-solid two-phase flow

Hilbert-Huang transform based electrostatic signal analysis ...

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IEEE Instrumentation and Measurement Technology Conference

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

Online measurement of the particulate flow plays a significant role in the monitoring and controlling process of the industrial application. Due to the simple structure and non-intrusive character, the electrostatic sensor is widely used in industrial applications. The electrostatic signal from ring-shape electrostatic sensor was used in this paper to investigate the flow dynamics. Because of the advantages of Hilbert-Huang Transform, it was utilized to characterize the flow dynamics from the electrostatic signal of dilute gas-solid two-phase flow in the horizontal pipeline. A new method was introduced to eliminate the noise component of the electrostatic signal. The filtered electrostatic signal was then analyzed to find the relationship between the average fluctuation frequency and air flow rate. Besides, it can be concluded that the energy of the selected intrinsic mode functions can be a useful parameter to characterize the solid-phase concentration.

关键词： Electrostatics Solids Electrostatic measurements Fluctuations Pipelines Noise Fluid flow measurement

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Construction of gas flow standard facilities by means of positive pressure sonic nozzle

Construction of gas flow standard facilities by means of pos...

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International Conference on Mechanic automation and control engineering (MACE)

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

The sonic nozzle airflow standard facilities are applied widely throughout the world and can be divided into two categories, negative pressure and positive pressure methods. The latter is better than the former at calibrating flowmeters and analyzing the impact of pressure and density on performance of flowmeters. This paper discusses several key issues about establishing standard facilities by the positive pressure method. In order to ensure the stability of stagnation pressure and flow rate, it is vital important to choose rationally the parameters of stable pressure system which is jointly controlled by the air compressors, gasholders and self-operated pressure regulating valves. On the basis of the analysis of the heat transfer process, the water vapor in the compressed air is most likely to be saturated and cause dew to condense out of the compressor air. For this reason, the measures of filtration and drying should be included in the standard facilities. Critical flow function which changes with temperature and pressure must be calculated from ISO equation, instead of using a constant.

关键词： Fluid flow Equations automation Electrical engineering Laboratories process control Fluid flow measurement

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Research of roots flow meter based on ARM Cortex-M3

Research of roots flow meter based on ARM Cortex-M3

引用

International Conference on Consumer Electronics, Communications and Networks

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

This paper introduces an intelligent roots flow meter based on ARM Cortex-M3 processor and μC/OS-II embedded real-time operating system. ARM Cortex-M3 processor is an industry-leading 32-bit processor with lower power consumption and higher performance than other 8-bit or 16-bit processors. Using the μC/OS-II embedded real-time operating system, it will compensate the temperature and pressure of the roots flow meter more instantly. What's more, it makes communication and networking easier by using ZigBee technology.

关键词： Temperature measurement Real time systems Operating systems Zigbee Hardware Fluid flow measurement Fluid flow

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