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 s...
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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%.
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 o...
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ISBN:
(纸本)9781612844589
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.
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 desc...
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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.
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. Th...
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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...
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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.
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 Univ...
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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.
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 excite...
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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.
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...
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ISBN:
(纸本)9781424494361
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 facility, a gas-solid two-phase flow standard facility used to calibratio electrostatic sensor is designed.
In this paper, a continuous, time varying adaptive controller is developed for an underactuated quadrotor unmanned aerial vehicle (UAV). The vehicle's dynamic model is subject to uncertainties associated with mass...
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In this paper, a continuous, time varying adaptive controller is developed for an underactuated quadrotor unmanned aerial vehicle (UAV). The vehicle's dynamic model is subject to uncertainties associated with mass, inertia matrix, and aerodynamic damping coefficients. A Lyapunov based approach is utilized to ensure that position and yaw rotation tracking errors are ultimately driven to a neighborhood about zero that can be made arbitrary small. Simulation results are included to illustrate the performance of the control strategy.
This paper introduces a new-type turbine flow meter. The concept is to apply magnetic suspension bearing to reform turbine flow meter. Beginning with the structure and working principle of magnetic suspension bearing,...
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This paper introduces a new-type turbine flow meter. The concept is to apply magnetic suspension bearing to reform turbine flow meter. Beginning with the structure and working principle of magnetic suspension bearing, the magnet suspension bearing is compared with the common bearing in their differences and characteristics. To draw a conclusion from the comparison that the turbine flow meter based on magnetic suspension bearings superiors to the one with common bearings, and the problems in the application of magnetic suspension bearing are introduced at the same time. Numerous experiments show that the range of measurement can be largely widened and the working life span of turbine flow meters also can be extended with magnetic suspension bearings.
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