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A PXI based Operating-Strategy-Configurable ERT for Gas-Water Horizontal Flow Regime Identification

A PXI based Operating-Strategy-Configurable ERT for Gas-Wate...

引用

The 7th International Symposium on Measurement Techniques for Multiphase Flows

作者： CAO Yang DONG Feng TAN Chao Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University

Electrical Resistance Tomography(ERT) technique has great prospective in industrial measurement and monitoring with merits of non-intrusive,non-radiant,visualization and ***,the application of this technique is restricted by its real-time *** this paper,the scheme of the Operating-Strategy-Configurable ERT system based on PXI module instruments has been *** Operating-Strategy-Configurable ERT System can work in different working Strategies including 16-electrodes mode,8-electrodes mode and 4-electrodes for different flow regime,16-electrodes mode is used for imaging,8-electrodes and 4-electrodes mode for regime identification and monitoring The result shows that,when the ERT system is working in dual-plane mode,the sampling speed of each plane is 625 frames/s at 16-electrodes mode,1562frames/s at 8-electrodes mode,and 3125 frames/s at 4-electrodes *** has improved the system real-time *** characteristic value which is extracted by the wavelet from the measured data of each cross section shows that the system has a good capacity of identification flow regimes.

关键词： Electrical Resistance Tomography PXI Operating-Strategy-Configurable Flow Regime

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Optimum design of vision sensor for the three-dimensional measurement of bubbles

Optimum design of vision sensor for the three-dimensional me...

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The 7th International Symposium on Measurement Techniques for Multiphase Flows

作者： T.Xue Y.X.Jin Z.F.Cao T.Zhang Tianjin Key Laboratory of Process Measurement and Control College of Electrical Engineering and AutomationTianjin University

We develop a novel virtual stereo vision sensor which contains just single high-speed camera and two reflector sets to measure three-dimensional feature parameters of bubbles in the gas-liquid two-phase *** measurement principle of the binocular stereo vision sensor and the virtual stereo vision sensor are analyzed in *** to the mathematical model of the virtual stereo vision sensor,the structure parameters of virtual stereo vision sensor are optimized based on the actual size of view field,and the three-dimensional measurement error is *** threedimensional modality and motion parameters are tested on the upstream bubble producing *** experimental results show that the three-dimensional distance error of the virtual stereo vision sensor is better than 0.132 mm and the relative error is better than 0.5%,and the three-dimensional motion trail of bubble is reconstructed.

关键词： gas-liquid two-phase flow bubbles three-dimensional measurement vision sensor optimum design

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Investigation on Pressure-tapping Methods of Long Waist Cone Flow meter Using CFD Simulation

Investigation on Pressure-tapping Methods of Long Waist Cone...

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The 7th International Symposium on Measurement Techniques for Multiphase Flows

作者： WEI Can TAN Chao DONG Feng YU Xuelian Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University

Differential pressure(DP) flow meters are playing an increasingly important role in multiphase flow in petroleum *** long waist cone flow meter,as a new type of DP flow meter,is introduced in this *** its flow field in a horizontal pipe of 50 mm diameter is numerically simulated with Computational Fluid Dynamics(CFD),in search of the optimum pressure-tapping *** results of numerical simulations indicate that the long waist cone flow meter has the merits of the annular channel flow meters by forming an annular flow in annular channel region,which makes it possible to improve the repeatability and accuracy of *** high pressure port at the 1D upstream of the cone's entrance section and the low pressure port at the middle of annular channel region and 3D downstream of the cone's exit section are the optimum pressure-tapping *** relative error of discharge coefficient is within ±0.5%.This investigation will provide a theoretical and design basis for the development of new DP flow meters.

关键词： Long Waist Cone Flow Meter Pressure-tapping Methods CFD Acceleration Pressure Loss

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Fuzzy Clustering based Fusion For ERT Tomography Image

Fuzzy Clustering based Fusion For ERT Tomography Image

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The 7th International Symposium on Measurement Techniques for Multiphase Flows

作者： Shihong Yue Weiqin Li Xian Zhao Ziqiang Cui Huaxiang Wang School of Electrical Engineering and Automation Tianjin Key Laboratory of Process Measurement and ControlTianjin University

Electrical resistance tomography(ERT) techniques have been developed rapidly during the past decades as an advanced measurement and visualization *** drive pattern in ERT could provide an acceptable solution in some applications,while for most complex applications additional information is required for comprehensive understanding of the process under ***,individual driven system has been studied for various measurements,but there are poor sensor integration and data fusion approaches in *** this paper,any ERT imaging method is considered as a classifier,and then a fuzzy clustering based fusion method has been developed to fuse these classifiers towards better ERT image *** proposed method is applied to image the same investigated objectives under eight typical current drive *** show that the proposed method can provide image of higher space resolution than any individual drive pattern.

关键词： Image fusion Electrical resistance tomography Current drive pattern

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GPRS based remote data acquisition and forecasting system for long-distance natural Gas pipeline monitoring

GPRS based remote data acquisition and forecasting system fo...

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2012 International Conference on Computational Problem-Solving, ICCP 2012

作者： Zhao, Xiaoyan Zhang, Zhaohui Meng, Wei School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Advanced Control of Iron and Steel Process Ministry of Education Beijing 100083 China School of Electrical and Electronic Engineering Nanyang Technological University 3 Singapore Singapore

ISBN: (纸本)9781467316972

Wireless based data acquisition solutions are widely used in many fields like structure monitoring, transportation or environmental studies. This paper presents a General Packet Radio Service (GPRS) based remote data acquisition and forecasting system, which monitors the geological disasters along the natural gas pipeline under the ground. The field data terminal units (DTU) collect data from the sensors installed on the pipe, and transmit the data by GPRS module to the server in the control center. The server processes the data, broadcasts on the website, and forecasts abnormal variation in time. Three years' operation in site shows the system is effective and feasible. © 2012 IEEE.

关键词： Data acquisition

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Robust control with state decoupler for combined shape and gauge system in rolling process

Robust control with state decoupler for combined shape and g...

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International Conference on Automatic control and Artificial Intelligence, ACAI 2012

作者： Jing, Peng Tong, Chaonan Hu, Changjun School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Advanced Control for Iron and Steel Process Ministry of Education Beijing 100083 China School of Computer and Communication Engineering University of Science and Technology Beijing Beijing 100083 China

ISBN: (纸本)9781849195379

Considering the dynamic characteristics of the deformation zone, a new model of combined shape and thickness system in rolling process was proposed, regarding bending force and gauge as the main factors. Taking various kinds of secondary causes, perturbation and disturbance into consideration, robust control methods were brought in. A mathematic model was proposed based on field data, then static decoupler and robust controller were developed with benefit of robust control toolbox in MATLAB. Simulation results show the effectiveness of tracing and decoupling and robustness for parameter perturbation.

关键词： Robust control

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Analysis of constant-current characteristics for current sources

Analysis of constant-current characteristics for current sou...

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Chinese control and Decision Conference, CCDC

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

A current source is one of the most important circuits in Electrical Impedance Tomography (EIT) hardware systems for measuring conductive multiphase flows. One of its important and challenging features is to deliver a relatively large and constant current for a wide range of resistive loads, high signal to noise ratio, and a large bandwidth. To resolve this problem, three different current sources are discussed and compared. They are the Howland current source, an enhanced Howland current source and a dual op-amp current source. The constant-current characteristics is analyzed and compared in circuit principle. Simulation and experimental results show that the enhanced Howland is most stable among the three current sources when the frequency or load changes. Initial tests have proven the feasibility of EIT system with the enhanced Howland current source.

关键词： Impedance Tomography Resistors Voltage measurement Resistance Current measurement Electrodes

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The dynamic compensation of temperature sensors in sonic nozzle airflow standard facilities based on method of positive pressure

The dynamic compensation of temperature sensors in sonic noz...

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IEEE Instrumentation and Measurement Technology Conference

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

Pt-resistance temperature sensors are very often used in gas-supply systems, and the sonic nozzle airflow standard facilities are no exception. In order to improve dynamic response of Pt thermal resistances and obtain the detailed variation of temperature in pipeline and stagnation tank of airflow standard facility, a realization technique of the temperature compensation, using the model of heat transfer to acquire regularity of temperature change, solving the actual model of Pt thermal resistances and parameters of inverse model by particle swarm optimization algorithm and wavelet filtering algorithm, has been presented in detail. The experimental and simulation results demonstrate the correctness and effectiveness of this compensation method.

关键词： Heat transfer Temperature sensors Thermal resistance Standards Fluids Heating Temperature measurement

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Application of PLC for arranging bottle in Beer filling production line

Application of PLC for arranging bottle in Beer filling prod...

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Chinese control and Decision Conference, CCDC

作者： Tianxia Zhang Feng Dong Hao Yuan Tianjin Key Laboratory of Process Measurement and Control School of Electrical Engineering and Automation Tianjin University Tianjin China

In order to make the operation of Beer filling production line automatic and efficient, the control of each subsection needs to be optimized. Arranging bottle is the first subsection of the beer filling production line. And the realization of its control function plays an important role in the smooth operation of the entire production line. To address the issue of the automatic control problems in the arranging bottle process, PLC (programmable logic controller) technology is applied to realize the design of the control system architecture and control procedures. In the project of the control system, depending on the operating state, the functions of the motors and solenoid valves, which are the key parts, are designed. According to the different operation, timely adjustments are made to improve the system efficiency. Meanwhile, on the basis of the monitoring of the operational status and the design of the program, the system faults are diagnosed, and the appropriate control treatments are made, which achieves an automatic, efficient and stable operation of the arranging bottle process.

关键词： Belts Solenoids Valves Sensors Induction motors process control

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Annular field-focusing capacitance sensor for visualization of the two phase flows

Annular field-focusing capacitance sensor for visualization ...

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IEEE Instrumentation and Measurement Technology Conference

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

In this work, the construction of a field-focusing capacitance sensor geometry in the pipeline for monitoring the multiphase flow of non-conductive materials is presented. With a built-in cone, the annular flew field is formed. The sensor geometry has the electrodes around the built-in cone and the inner wall of the tube for forming the field-focusing capacitance measurement form in annular field. Two typical sensitivity maps for the annular field-focusing geometry were calculated with a finite element approach and some typical situation with the sensitivity feature are discussed. Using the multiplexed excitation and parallel measurement scheme, the capacitance of the fluid in the sub-region which defined by the field-focusing sensor in the annular pipe is measured. The prototype sensor is formed by 16 by 16 electrodes, presenting a total of 256 sub-domain capacitance measurements. The annular field flow images can be obtained from the raw measurement data directly. Three annular field two phase flow types are used to carry out simulation experiments and the imaging capability is tested.

关键词： Electrodes Capacitance Capacitance measurement Permittivity Sensitivity Imaging Shape

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