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RISS 인기검색어
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- 저자 : Xuewei Chao (검색결과 5 건)
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Tilt Angle Measurement Based on Arrayed Eddy Current Sensors
Xuewei Chao,Yang Li,Jing Nie 한국자기학회 2016 Journal of Magnetics Vol.21 No.4
Eddy current (EC) sensor works based on the electromagnetic induction principle and has been widely applied in the industrial testing and evaluation due to its robustness and environmental adaptability. Meanwhile, tilt angle measurement is mainly based on the laser or visual method, which is strict with the measurement environment and not suitable for the industrial applications. In this paper, a novel tilt angle measurement method based on arrayed EC sensors is proposed. Both the simulation and experiments indicate that the measured error is approximately linear with tilt angle and the accuracy after compensation is 0.25°. In conclusion, this research cannot only broaden the scope of EC application, but also overcome the shortcomings of existing angle measurement methods.
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Disturbed-entropy: A simple data quality assessment approach
Yang Li,Xuewei Chao,Sezai Ercisli 한국통신학회 2022 ICT Express Vol.8 No.3
From the perspective of information value, we proposed a simple and effective approach to assess data quality, called disturbed-entropy. In specific, considering image classification task, the existing samples per category are statistically represented as a pixel prototype, which is used to disturb the unseen samples. Then, the entropy of disturbed image is calculated based on predicted probability. Both the numerical and visual experiments are conducted to show the effect. In case of same data budget, the performance comparison based on selected good and bad data is significant and consistent. This work attempts to gain insight into data quality and redundancy.
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Lijiao Gong,Xinheng Li,Xuewei Chao,Jing Zuo,Yang Li 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
As known, the variation of distances between the adjacent coils will affect the transfer efficiency in magnetic coupled resonance system. In order to explore the influence of distance on the optimum transfer efficiency, a four-coil magnetic coupled resonance system is established. Based on the mutual inductance coupling theory, the relationship between the transfer efficiency and coupling coefficient is obtained. Supported by the simulation analysis and experimental evidences, it is found that the coupling coefficient k23 (between transmitter and receiver coils) is the most significant factor affecting the transfer efficiency. Under the optimal k23, the transfer efficiency will increase with the coupling coefficient k12 (between driver and transmitter coils). Besides, it will firstly increase and then decrease with the coupling coefficient k34 (between receiver and load coils). Moreover, the theoretical calculation formula of k23 is deduced, which can make a contribution to the optimization of parameters and improvement of transfer efficiency for the four-coil magnetic coupled resonance system.
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Lijiao Gong,Xinheng Li,Xuewei Chao,Yang Li,Hui Li,Hongwei Li 한국자기학회 2017 Journal of Magnetics Vol.22 No.3
The impedance matching problem of magnetic coupled resonant wireless power transfer system based on planar spiral coils is studied in this paper. Taken the coupling factors into account, the relationships between impedance matching, resonant frequency and transfer distance are analyzed. Supported by the simulation analyses and experimental evidences, it is indicated that the optimum matching resistances for transfer power and transfer efficiency are different. In details, the optimal matching resistance for output power decreases with the transfer distance, while that for the transfer efficiency does not vary with transfer distance. Thus, this research provides a valuable reference for the further research on adaptive impedance matching of magnetic coupled resonant wireless power transfer system.
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Magnetic Shielding Analysis for Arrayed Eddy Current Testing
Jing Nie,Yang Li,Saibo She,Xuewei Chao 한국자기학회 2019 Journal of Magnetics Vol.24 No.2
Arrayed eddy current testing (AECT) has been widely applied in the field of crack detection, displacement measurement and many other fields due to its non-destructive and high efficiency. But the coupling interference of AECT exists objectively and leads to the detection error directly. In this paper, a magnetic shielding layer is proposed to reduce the coupling interference. The relationships between electromagnetic parameters of magnetic shielding material and coupled magnetic field are discussed theoretically. Furthermore, the simulation and experiments are carried out, the results are consistent. It shows that the application of magnetic shielding layer in AECT can reduce the mutual inductance of probe coils and increase the output voltage. Additionally, the most important factor to select material of magnetic shielding layer is the conductivity. Thus, the magnetic shielding layer with large conductivity will be suitable for AECT to promote the testing performance.
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