A water flow diverter is an essential and error determining component of a liquid flow facility based on a static gravimetric system with flying start and finish. A new diverter was developed in order to reduce the un...
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Electromagnetic tomography (EMT) is of potentially practical value in the field of both industrial and biomedical detection. However, the sensitivity of the sensor array on the changes of the object field distribution...
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Electromagnetic tomography (EMT) is of potentially practical value in the field of both industrial and biomedical detection. However, the sensitivity of the sensor array on the changes of the object field distribution, sensitivity and accuracy of the system, measurement precision and system stability are highly dependent on excitation condition. In this paper, the excitation condition of EMT is analyzed with COMSOL Multiphysics the finite element analysis software, the effect can be discussed in two aspects. One is the direct effect on the measurement results from the change of the excitation condition; another is the changing affect on the distribution of integrated sensing field. In this paper, two elements were set which would lead to the change of the excitation condition, the excitation frequency and the excitation strategy. These two elements would affect the sensing field from diverse aspects.
Differential pressure (DP) flow meters are playing an increasingly important role in multiphase flow in petroleum industry. The long waist cone flow meter, as a new type of DP flow meter, is introduced in this paper. ...
Differential pressure (DP) flow meters are playing an increasingly important role in multiphase flow in petroleum industry. The long waist cone flow meter, as a new type of DP flow meter, is introduced in this paper. And its flow field in a horizontal pipe of 50mm diameter is numerically simulated with Computational Fluid Dynamics (CFD), in search of the optimum pressure-tapping method. The 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 measurement. The 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 methods. The 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.
Conductance sensor array is widely used in measuring two-phase flow parameters, in this paper we propose a new configuration of conductance sensors with six rectangular electrodes of same size from the pipe facing to ...
Conductance sensor array is widely used in measuring two-phase flow parameters, in this paper we propose a new configuration of conductance sensors with six rectangular electrodes of same size from the pipe facing to an inner ring-type electrode and use it to measure gas cross-sectional-averaged water holdup value. The designed six rectangular electrodes are axially flush-mounted on the inside wall of an insulating duct. The geometry of six electrodes conductance sensor was determined with finite element numerical analysis. Sensor optimization of the electric field such as uniformity, spatial sensitivity is proposed. This configuration can improve measurement accuracy, through analyze sensitivity distribution, the role of soft field is discussed, and acquired the final size of the electrodes in the end. The simulation results were obtained from COMSOL Multiphysics finite element software.
This paper mainly studies the design and optimization of diverter's nozzle in the flow facility. The profile of the flow at the outlet of the nozzle has great influence to the performance of the diverter. In case ...
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While nowadays inspection and maintenance is mainly performed manually, the deployment of mobile robot systems could reduce the necessary resources for these tasks in the future. Within this paper major hindrances and...
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While nowadays inspection and maintenance is mainly performed manually, the deployment of mobile robot systems could reduce the necessary resources for these tasks in the future. Within this paper major hindrances and possible remedies for the deployment of teleoperated mobile robots in industrial environments are discussed. Specifically, concepts for the seamless integration of mobile robots into industrial infrastructures, for intuitive feedback and commanding of such robots as well as advanced user-interfaces are elaborated. It is discussed in how far this multi-modal approach promises to significantly improve the usability of teleoperated robots for industrial applications.
It presents a computer control system for processcontrol based on data-driven. The system focuses on process data and is able to deal with the complex problems such as nonlinearity, significant delay, strong coupling...
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ISBN:
(纸本)9781467323635
It presents a computer control system for processcontrol based on data-driven. The system focuses on process data and is able to deal with the complex problems such as nonlinearity, significant delay, strong coupling and stochastic uncertainty, which are ubiquitous in processcontrol. It adopts both modeling method based on data and learning control theory. The computer control system is composed of PC servers and high performance embedded special controllers. control network adopts fully-distributed automation islands based on industrial Ethernet. So the powerful ability of data process is provided for the system and can satisfy the requirement of modeling and controlling based on data-driven.
The computer control system of a steel plant is composed of Siemens S7-400 PLC and configuration software WinCC. In order to achieve real-time control of water flow accurately in quenching process, this paper uses a c...
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ISBN:
(纸本)9781467323635
The computer control system of a steel plant is composed of Siemens S7-400 PLC and configuration software WinCC. In order to achieve real-time control of water flow accurately in quenching process, this paper uses a combination of Smith predictor and PID controller to compensate time delay of system and overcome problems caused by the delay. MATLAB simulation verifies that this method can solve the time delay problem in quenching process, and provide a solution for real-time control of water flow.
This paper introduces a method of forming up the cross sectional velocity profile of horizontal two-phase flow by adopting a dual-plane Electrical Resistance Tomography (ERT) system and cross correlation method. The p...
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This paper introduces a method of forming up the cross sectional velocity profile of horizontal two-phase flow by adopting a dual-plane Electrical Resistance Tomography (ERT) system and cross correlation method. The preliminary results are presented with numerical simulations, where a pixel-like mesh is used to segment the cross section of the measuring field. The relationship between the peripheral voltages measured from the electrodes with a feature value within a specific pixel is determined. The numerical simulation results show that this method can provide a visual distribution of velocity profile of dispersed phase within a continuous phase in the cross section of the pipeline.
The paper deals with working principle and design methods about gas flow standard facilities by master meter method. A wind tunnel was designed to work as the flow velocity measurement and calibration platform. The di...
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