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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 ...

引用

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

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

引用

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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Simulation of sensing field for electromagnetic tomography system

Simulation of sensing field for electromagnetic tomography s...

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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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Reconstruction of rising bubble with digital image processing method

Reconstruction of rising bubble with digital image processin...

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IEEE Instrumentation and Measurement Technology Conference

作者： Yuchen Bian Feng Dong Hongyi Wang Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University TJU Tianjin China

The description for rising bubble is important for the study of principle of the Gas/liquid two-phase flow. As to the rising bubble, reconstruction the shape of the bubble can make a strong foundation for further description. The bubble images were collected with two cameras; the images were preprocessed using digital images processing methods; parameters of the simulated ellipse were extracted with Hough transformation; and bubble simulated ellipsoid model were reconstructed based on these extracted parameters.

关键词： Ellipsoids Image edge detection Image reconstruction Wiener filter Maximum likelihood detection Gray-scale Noise

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Data fusion for measurement of water holdup in horizontal pipes by conductivity rings

Data fusion for measurement of water holdup in horizontal pi...

引用

IEEE Instrumentation and Measurement Technology Conference

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

This paper introduces a method of fusing measurement data of a set of conductivity ring sensors to determine the average water holdup of oil-water two-phase flow within a horizontal pipeline. A six-ring conductivity sensor was built with 1kHz sampling rate, which delivers the generalized dimensionless conductivity and predicts the average water holdup based on Maxwell equation. An adaptive weighting algorithm is then brought forward to fuse the dimensionless conductivity and Maxwell equation to optimize the overall prediction upon average water holdup. The results suggest that the data fusion method reduces average relative error with 5.9%.

关键词： Conductivity Fluid flow measurement Electrodes Conductivity measurement Equations Sensor fusion

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

High-precision electrical resistance tomography with externa...

引用

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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