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5th International Conference on control Engineering and Artificial Intelligence, CCEAI 2021

作者： Yao, Xinhong Li, Xuejing Shanghai Institute of Measurement and Testing Technology Shanghai Key Laboratory of On-line Testing and Control Technology China

ISBN: (纸本)9781450388870

Electromagnetic flowmeter (EMFM) plays an important role in many production processes such as industry, medicine and agriculture. According to the measurement principle, the traditional electromagnetic flowmeter must have a large-size excitation module to provide a uniform magnetic field. However, this structure limits the use of electromagnetic flow meters. The saddle coil design has certain applications in electromagnetic flow sensors. The geometric size of the saddle coil is smaller than the Helmholtz coil and other large coils, so it has certain advantages in practical applications. But it causes the inhomogeneity of the induced magnetic field, which affects the measurement accuracy. This paper analyzes a saddle-shaped excitation module. An extended theory with a small magnetized flowmeter is proposed and compared with the experimental results. The electromagnetic field solution of the finite element program is proposed. The results of this study have certain guiding significance for the design process of the electromagnetic flowmeter excitation coil. © 2021 ACM.

关键词： Magnetic fields

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A Novel Corrugated Horn Antenna for Compact Field Measurement

A Novel Corrugated Horn Antenna for Compact Field Measuremen...

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International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Zuojiansheng Zuojiansheng Chen Chaochan Wuzhuang Wuzhuang Shanghai Institution of Measurement and Testing Technology Shanghai Key Laboratory of On-Line Testing and Control Technology Shanghai Institution China

In this paper, a novel corrugated horn antenna is developed in a wide frequency ranges from 40 GHz to 60GHz ,which is used to evaluate performance of the compact field. After simulation and optimization, a novel manufactured corrugated horn antenna is developed, the main data of which show great consistency with simulated data in parameters of standing-wave coefficient, radiation pattern and radiation gain. In the end, the developed corrugated horn antenna is used to evaluate the performance of compact field, which meet the measurement needs.

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Research on a Three-phase Flow Electromagnetic Measurement Method 4

Research on a Three-phase Flow Electromagnetic Measurement M...

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2020 4th International Conference on Energy Material, Chemical Engineering and Mining Engineering, EMCEME 2020

作者： Li, Xuejing Li, Haiyang Shanghai Institute of Measurement and Testing Technology Shanghai Key Laboratory of On-line Testing and Control Technology Shanghai China

For a long time, industrial and agricultural production has a wide range of requirements for energy saving and emission reduction. The flow parameter detection of water/gas/oil three-phase flow is of great significance in the control and optimization of the petroleum industry process. Using the principle of correlation method, a multi-electrode electromagnetic measurement method is designed to measure the three-phase flow. The system has the function of self-detection of the meter zero point. The finite element method is used to calculate and analyze the distribution of sensitive fields inside the flow measurement sensor and the influence of different physical parameters of non-conductive objects on the disturbance characteristics of the flow measurement sensor. And through experiments to prove the feasibility, stability and accuracy of the constructed measurement system. © 2021 Published under licence by IOP Publishing Ltd.

关键词： Flow measurement

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Investigation on the Direct Current Coefficient of I/V Transducer

Investigation on the Direct Current Coefficient of I/V Trans...

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International Conference on Electronic Measurement and Instruments, ICEMI

作者： Liren Zhou Li Zhu Ji Geng Shanghai Key Laboratory of On-line Testing and Control Technology Shanghai Institute of Measurement and Testing Technolog Shanghai China

Direct current coefficient is an essential parameter of I/V transducer, which directly affects the measurement results. Traditional method, comparing the measured transducer with the standard transducer, has limitations; failure to solve the problem in essence. To measure the direct current coefficient accurately, a measuring device was developed, which consists of direct current source, standard direct current ratio, adjustable standard direct current ratio, standard I/V transducer, voltage meter and null indicator. A measurement method was proposed, which fixes the value of direct current source and current flowing through the standard I/V transducer; adjusts the current through the high accuracy ratio conversion. The error measurement principle was employed to minimize the influence on the measurement results. Measure the current coefficient of an I/V transducer and restore its actual working state. The result shows that the current coefficients in the four current ranges are all negative, and are basically in the order of 10 −5 . The proposed method is characterized by breaking dependence on the superior standard device and meets the needs of precise measurement result correction.

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Study on A-GNSS Terminal Over-The-Air Test System 15

Study on A-GNSS Terminal Over-The-Air Test System

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15th IEEE International Conference on Electronic Measurement and Instruments, ICEMI 2021

作者： Wang, Yunling Cai, Qing Xu, Jie Shanghai Institute of Measurement and Testing Technology Shanghai Key Laboratory of On-line Testing and Control Technology Shanghai China

ISBN: (纸本)9781665444910

The A-GNSS terminal Over-The-Air (OTA) test system is a system for OTA performance of terminals that support A-GNSS. Terminals supporting A-GNSS can search for satellite navigation signals quicker than terminals only supporting GNSS. Active test is to measure the radiant power and receiving sensitivity of terminal over the air in a microwave anechoic chamber, which displays radiation performance of whole terminal obviously. Many test plans for OTA have been released, and among them the most recognized one is released by CITA. The instruments are mainly provided by Spirent and RS. This paper introduces test plans, test situation of network operators and test institutions, compares 2 solutions provided by Spirit and RS, describes test procedures, and simulates sensitivity test process. © 2021 IEEE.

关键词： testing

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Real-Time Checks for Radiated Emission Measurement System 6

Real-Time Checks for Radiated Emission Measurement System

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6th International Conference on Electronics technology, ICET 2023

作者： Li, Jinlong Zhao, Wenhui Jin, Shanyi Shanghai Institute of Measurement and Testing Technology Emc Laboratory Fundamental Performance Test Center Shanghai Key Laboratory of Online Test and Control Technology Shanghai China

ISBN: (纸本)9798350337693

In radiation emission measurement, it is necessary to switch different types of measuring antennas or adjust the polarizations of the antennas. Therefore, there is a large risk of measurement data errors in the radiation emission measurement system. However, the current intermediate validation method used for the measurement system is time-consuming and not suitable for frequently checking the system compliance. In this paper, a real-time check method for radiated emission measurement system is proposed to achieve real-time validation of the measurement system during the measurement process. Meanwhile, the influences of the reference signals and electromagnetic wave reflections from the multi-frequency reference source device on measured data are avoided. The accuracy and reliability of the measured data can be ensured. © 2023 IEEE.

关键词： Antennas

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Q-Learning for Stackelberg Games of Uncertain Nonlinear Systems 3

Q-Learning for Stackelberg Games of Uncertain Nonlinear Syst...

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3rd International Conference on Service Robotics, ICoSR 2024

作者： Tang, Wenbei Cui, Xiaohong Sun, Jun Deng, Jiaxian The College of Mechanical and Electrical Engineering China Jiliang University Hangzhou China China Jiliang University Zhejiang Province Key Laboratory of On-line Testing Equipment Calibration Technology Research Hangzhou China

ISBN: (纸本)9798350367119

The Stackelberg equilibrium approach is based on the traditional dynamic programming technique, which requires an understanding of the system model to solve the optimal control problem. Therefore, we propose a Q-learning algorithm based on actor-critic structure to solve the optimization problem of Stackelberg game in nonlinear systems with unknown system model data. Currently, the Q-learning algorithm is mainly used in the study of linear systems in this direction, and the study of nonlinear system problems is limited. In addition, the stability of the system is ensured by proving the consistency of the system state and the ultimate boundedness of the neural network weight estimation error. Finally, the effectiveness of the algorithm is verified by simulation experiment. © 2024 IEEE.

关键词： Dynamic programming

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Research on weight function distribution method under special boundary based on electrical characteristics

Research on weight function distribution method under specia...

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IEEE Information technology, Networking, Electronic and Automation control Conference

作者： Xuejing Li Xinhong Yao Shanghai Institute of Measurement And Testing Technology Shanghai China Shanghai Key Laboratory of On-Line Testing and Control Technology Shanghai China

The correct solution of weight function is very important to the analysis of induced potential distribution. In this paper, the weight function under the special boundary of Laplace equation is simulated and studied. Firstly, the boundary conditions are studied by using the electrical characteristics of the electromagnetic flowmeter sensor. Secondly, the weight functions of different conductivity and thickness measuring tubes are analyzed. Finally, the analysis conclusions are verified from the perspective of experiments. The research conclusion proves the correctness and validity of the research theory based on the special boundary weight function of electrical characteristics. The analysis method in this paper is of great significance in studying the influence of electromagnetic flowmeter wall contamination and electrode contamination on the weight function.

关键词： Electrodes Weight measurement Conductivity Flowmeters Pollution measurement Electron tubes Electromagnetics

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Research on electromagnetic flowmeter measurement of non-full pipe flow based on numerical analysis method

Research on electromagnetic flowmeter measurement of non-ful...

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IEEE Information technology, Networking, Electronic and Automation control Conference

作者： Xuejing Li Zhongli Zhang Shanghai Institute of Measurement And Testing Technology Shanghai China Shanghai Key Laboratory of On-Line Testing and Control Technology Shanghai China

The measurement of non-full pipe uniform flow with circular section is the focus of energy saving and emission reduction and government regulation. In order to study the accurate measurement of non-full flow, a three- dimensional mathematical model was established, and the boundary conditions were determined. Based on the velocity distribution characteristics of non-full flow section, an electromagnetic non-full flow measurement device is constructed. Set up the non-full flow calibration device in the laboratory, and carry out the experiment of real flow measurement in the laboratory. In order to ensure the accuracy of non-full tube flow measurement, the flow stabilizing device and non-full tube electromagnetic flowmeter are designed based on the study of the flow field distribution of non-full tube flow. The experimental results show that the error is less than 1.3% and the expanded uncertainty is U = 0.025% (K = 2) . The simulation model and parameter selection are also verified by the experimental results.

关键词： Uncertainty Measurement uncertainty Flowmeters Boundary conditions Mathematical models Regulation Electron tubes

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An experimental study of noise generated by tandem blades

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Chinese Journal of Aeronautics 2025年第2期38卷 143-160页

作者： Xiaolong TANG Fan TONG Chao WANG Jue DING Guangming LI Xiaoquan YANG Shanghai Institute of Applied Mathematics and Mechanics Shanghai Frontier Science Center of MechanoinformaticsShanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Key Laboratory of Aerodynamic Noise Control China Aerodynamics Research and Development CenterMianyang 621000China Equipment Design and Testing Technology Research Institute China Aerodynamics Research and Development CenterMianyang 621000China

To facilitate the low-noise design of tandem lift bodies as applied in aeroengines and aircraft,the acoustic features of tandem blades are investigated by wind-tunnel *** is further specialized for the rotating blades applied in contra-rotating open rotors under the concept of frozen-rotor.A 70-channel phased microphone array and nine high-precision free-field microphones are *** beamforming method,enhanced by a source filtering technique,is employed to locate noise sources,providing insights into the source patterns of blade-blade interaction noise concerning flow speed,blade spacing,and aft blade *** results show the following:(A)Sources of tandem-blade noise exist in the form of concentrated source clusters,resulting in two major clusters:the mid-span interaction noise and the tip-induced noise.(B)These source clusters tend to separate as flow speed or blade spacing increases.(C)By increasing blade spacing,the band-pass filtered overall sound pressure level is reduced by 2.9 dB.(D)A two-phase noise suppression pattern is observed with blade clipping,resulting in a total reduction of 3.0 dB for the interaction noise through the removal of tip-induced noise sources and the replacement of mid-span noise *** on these findings,suggestions concerning blade spacing and clipping are discussed.

关键词： Tandem blades Contra-rotating open rotor Noise Beamforming Blade spacing and clipping Wind tunnel test

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