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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

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

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

ISBN: (纸本)9781424494392

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. © 2011 IEEE.

关键词： 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...

引用

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

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

ISBN: (纸本)9781424494392

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. © 2011 IEEE.

关键词： Flowmeters

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Extraction of bubble shape parameters in two-phase flow based on digital image processing

Extraction of bubble shape parameters in two-phase flow base...

引用

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

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

ISBN: (纸本)9781424480395

As the most common pattern of multi-phase flow, Gas/liquid two-phase bubble flow plays an important role in the study of the principle of Gas/liquid two-phase flow. For the rising bubble in Gas/liquid two-phase bubble flow, various kinds of digital image processing methods were introduced, and we disposed the bubble flow images using the digital image processing methods that appropriate for this study;Hough transformation method was introduced and used to extract the simulate ellipse parameters from bubble images, and this parameters could provide the data foundation for further study of the principle of Gas/liquid two-phase flow. © 2011 IEEE.

关键词： Image processing

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The evaluation of the second-order pre-iteration Landweber algorithm based on the method of model-group

The evaluation of the second-order pre-iteration Landweber a...

引用

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

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

ISBN: (纸本)9781424494392

In order to solve the poor real-time property in Landweber algorithm, a pre-iteration algorithm had been proposed by the researchers. But it is still lack of the study on this modified algorithm, especially to its second-order iterative form. In this article, this pre-iteration Landweber algorithm in second-order iterative formula will be evaluated based on the method of model-group, some parameters will be designed to do the quantitative analysis. The results show the second-order pre-iteration Landweber algorithm has a better convergence rate than it in first-order form, it also has a good ability to follow the change of reference model after an optimal number of iteration is found, the quality of the reconstructed images are better and suitable for practical application. © 2011 IEEE.

关键词： Iterative methods

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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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Analysis and selection of the flow stability parameter of flow standard facility

Analysis and selection of the flow stability parameter of fl...

引用

International Conference on Electrical and control engineering (ICECE)

作者： Yanxing Wei Lijun Sun Ziyan He Tao Zhang Tianjin Key Laboratory for Process Measurement and Control School of Electrical and Automation Engineering Tianjin University Tianjin China

In this paper, the evaluation methods of flow standard facility in every regulations were compared and analyzed. Analysis of the two performance parameters of the flow stability within cumulative time and the flow stability between cumulative time. From the two angles of the structure of turbine flow meter itself and the calculation formula of the stability parameter, the selection principle of the stability parameter is determined. The flow stability between cumulative time is selected as the main parameter, and the flow stability within cumulative time as reference. And the results of flow stability test between the method of turbine flow meter and the weighing method were compared. The results show that the method of turbine flow meter can also be an accurate method for testing the flow stability of flow standard facility.

关键词： Stability criteria Turbines Fluid flow measurement Fluctuations Time measurement Uncertainty

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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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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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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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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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