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441 results on '"Pan, Mengchun"'

9. Research on Maglev Track Irregularity Based on Power Spectral Density

Author

Yang, Qingqin, Zhang, Qi, Zhang, Zhuo, Chen, Dixiang, Pan, MengChun, Zhou, Wenwu, Su, Kuan, Ren, Yuan, Ma, Hao, Liu, Lihui, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Tan, Kay Chen, Series Editor, Yadav, Sanjay, editor, Kumar, Rahul, editor, Zainuddin, Hidayat, editor, and Deng, Lvxiang, editor

Published
2023
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16. Analytic Hierarchy Process (AHP)-Based Evaluation of Extremely-Low-Frequency Magnetic Field Contribution Rates.

Author

Fu, Hongyu, Pan, Mengchun, Zhang, Qi, Hu, Jiafei, Guan, Feng, Xu, Yujing, Huang, Bo, Li, Haibin, Chen, Dixiang, and Liu, Zhongyan

Subjects
ANALYTIC hierarchy process, MAGNETIC fields, FEATURE extraction, SUBMARINES (Ships)
Abstract

The extremely-low-frequency (ELF) magnetic fields of submarines serve as key characteristics for target detection, with their formation mechanisms being complex and diverse. Effectively manipulating a submarine to reduce its magnetic signature is crucial for enhancing its magnetic stealth capabilities. However, current research on the impact of various causative factors is insufficient. This study proposes a contribution rate assessment method based on the Analytic Hierarchy Process (AHP) model, aiming to provide a theoretical basis for effective manipulation. Initially, a thorough analysis of the threat causes of a submarine's ELF magnetic fields is conducted, and a corresponding hierarchical threat structure model is established. Subsequently, magnetic field signal characteristics generated by different causes are obtained through simulation, and threat matrices and characteristic matrices are constructed. Finally, the contribution rates of different causative magnetic fields to the total magnetic field are calculated, and the simulation results validate the effectiveness of the method. At the stern detection line, the contribution rate of the wake magnetic field is the highest, reaching 0.7649. Along the radial detection line, the contribution rate of the shaft frequency magnetic field is the highest and gradually decays, eventually falling below the wake magnetic field at 150 m and remaining at an approximately 0.5 contribution rate. This study calculates the contribution rates under different operational conditions and detection scenarios, laying a technical foundation for research on the comprehensive active control strategies of submarine ELF magnetic fields in different scenarios. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Spin‐Transfer‐Torque Magnetic Tunnel Junction Nonlinear In‐Sensor Computing Synapse for Improving the Performance of the Feedforward Neural Network

Author

Ji, Minhui, primary, Wang, Jiayuan, additional, Yang, Liyuan, additional, Zhang, Xinmiao, additional, Hu, Yueguo, additional, Du, Qingfa, additional, Hu, Jiafei, additional, Qiu, Weicheng, additional, Peng, Junping, additional, Chen, Xiaowen, additional, Luo, Yanxiang, additional, Fang, Bin, additional, Li, Peisen, additional, and Pan, Mengchun, additional

Published
2024
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23. Output Characteristics of External-Cavity Mode-Hop-Free Tunable Laser Source in C+L Band.

Author

Sun, Jisheng, Qiu, Liqiang, Liu, Lei, Sheng, Liwen, Cui, Yudong, Huang, Lin, Pan, Mengchun, Nian, Fushun, and Hu, Jiafei

Subjects
TUNABLE lasers, ACTIVE medium, SPECTRUM analysis, VECTOR analysis, RADIATION
Abstract

Tunable laser sources with a wide wavelength tuning range, mode-hop-free (MHF) operation, and high spectral purity are essential for applications such as high-resolution spectroscopy, coherent detection, and intelligent fiber sensing. In this paper, we present a wide-range tunable laser source that operates without mode hopping, based on external cavity feedback using a semiconductor gain chip as the laser gain medium. The wavelength, power, and spectral characteristics of the laser are experimentally measured. A wide MHF continuous wavelength tuning range from 1480 nm to 1620 nm with a side-mode suppression ratio of more than 61.65 dB is achieved. An output optical power of more than 11.14 dBm with good power stability can also be realized in the full C+L band. This proposed external-cavity tunable laser source features a narrow intrinsic linewidth and MHF tunable radiation with a maximum sweep speed of 200 nm/s, enabling practical applications such as high-resolution vector spectrum analysis. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Velocity-Related Magnetic Interference Compensation of Unmanned Underwater Vehicle.

Author

Luo, Huihui, Pan, Mengchun, Du, Qingfa, Zhang, Qi, Hu, Jiafei, and Ding, Zengquan

Subjects
*STANDARD deviations, *SUBMERSIBLES, *REMOTE submersibles, *FIELD research
Abstract

Underwater magnetic detection based on unmanned underwater vehicles (UUVs) is an important approach for marine exploration and monitoring. Due to the interference of the carrier magnetic field, the detection accuracy is severely limited. To improve the performance of magnetic detection, various compensation methods have been developed. However, the compensation effectiveness of these methods is greatly diminished when UUVs sail at different velocities. In this paper, we propose a velocity-related interference magnetic compensation method that enhances the conventional Tolles–Lawson model. By introducing a velocity-related term and combining the ridge regression with the linear fitting algorithm, we determine the compensation parameters for various UUV velocities. Field experiments are conducted to verify the effectiveness of the proposed method. The results show that the root mean square error of the total magnetic field after compensation is reduced from 246.90 nT to 2.23 nT. Our study demonstrates that the velocity-related compensation method can significantly improve the accuracy of interference magnetic compensation under different UUV velocities, making it applicable to actual underwater magnetic detection. [ABSTRACT FROM AUTHOR]

Published
2023
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