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Your search keyword '"Zhu, Lianghong"' showing total 31 results
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31 results on '"Zhu, Lianghong"'

3. Overmodulation Voltage Boundary Adaptation-Based Field Weakening Strategy for High-Speed SPMSM Drives

Author

Jing, Runze, Wang, Qiwei, Wang, Gaolin, Zhu, Lianghong, Zhang, Guoqiang, and Xu, Dianguo

Abstract

The overmodulation (OVM) strategy can improve the modulation index (MI) of the output voltage and expand the speed and torque range in the field weakening (FW) region. However, the motor current harmonics would be increased. To solve this issue, this article proposes an OVM voltage boundary adaptation-based FW strategy for high-speed permanent magnet synchronous motor (PMSM) drives. By analyzing the frequency spectrum of the OVM output voltage, an FW current model containing the harmonics is established. The adaptation strategy between different voltage boundaries is adopted in the dynamic state by inserting more continuous voltage vectors. The adaptive regulation of the optimized voltage boundary in the steady state is proposed by increasing the utilization of the dc-bus voltage considering the THD limitation of the phase current. The motor operating state is judged by the speed and current information, and the smooth switching between dynamic and steady states is realized. A contour plot of MIs is constructed to classify the OVM levels, and the boundary initial value curve is fitted to reduce the adaptive time. The proposed strategy can maximize the motor torque and speed satisfying the THD limitation, which is experimentally verified on a 6-kW high-speed PMSM platform.

Published
2024
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6. Supplemental material - Study on terahertz spectrum variation of inner package with different wrapped objects

Author

Wang, Jie, Yan, Shihan, Peng, Liang, Zhang, Hua, Zhu, Lianghong, Long, Sha, Wu, Hao, and Zhang, Xiaoxuan

Subjects
FOS: Materials engineering, 91299 Materials Engineering not elsewhere classified
Abstract

Supplemental material for Study on terahertz spectrum variation of inner package with different wrapped objects by Jie Wang, Shihan Yan, Liang Peng, Hua Zhang, Long Sha, Hao Wu and Xuan Xiao Zhang in Journal of Industrial Textiles Journal

Published
2023
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13. Phase Current Reconstruction Error Suppression Method for Single DC-Link Shunt PMSM Drives at Low-Speed Region

Author

Zhu, Lianghong, Chen, Feifan, Li, Binxing, Li, Chengrui, Wang, Gaolin, Wang, Siqi, Zhang, Guoqiang, Xu, Dianguo, Zhu, Lianghong, Chen, Feifan, Li, Binxing, Li, Chengrui, Wang, Gaolin, Wang, Siqi, Zhang, Guoqiang, and Xu, Dianguo

Abstract

The extensive application of vector phase shift modulation method in permanent magnet synchronous motor drive systems with single dc-link current sensor results in obvious current ripple in the low-speed region. The patterns of these ripples vary greatly in different sectors, leading to nonnegligible phase current reconstruction errors. In this article, an estimation of the local average current change rate (ELAC(2)R) based reconstruction error suppression method within the switching cycle is proposed to resolve this problem. By comparing the actual and the ideal sampling points, the increase of current ripple and the reconstruction error caused by the combination of the vector phase shift and the single current sensor sampling in the low-speed region are modelled and analyzed. Then according to equivalent modelling of the current ripple between the ideal and the actual sampling points, the more accurate phase current information can be quickly obtained based on the sampling value. The compensation process is significantly simplified and the computation burden of the processor is reduced. Experimental results show that the performance of current reconstruction can be improved effectively with less harmonic content with the proposed method., QC 20220315

Published
2022
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28. A Recognition Method and Application for One-Dimensional Waveform

Author

Du Rongyi, Ye Qing, and Zhu Lianghong

Subjects
Engineering, business.industry, Wavelet transform, Electromagnetic induction, Computer Science::Sound, Source separation, Graphical analysis, Waveform, Crest, Computer vision, Pattern matching, Artificial intelligence, business, Algorithm, Coding (social sciences)
Abstract

Real-time pattern recognition of one-dimensional waveform often requires both rapidity and accuracy. This paper presents a one-dimensional wave separation coding method, which simulates the way of human to understand figure, in order to carry through the graphical analysis of the wave crest or trough and their amounts, and to form pattern data-base of the waveform code. The model can make pattern match fast. This method is applied to the electromagnetic induction waveform identification of the road vehicles. The accuracy rate of real-time recognition can reach 92%.

Published
2008

30. A Light and Anonymous Three-Factor Authentication Protocol for Wireless Sensor Networks.

Author

Zhu, Lianghong, Xiang, Huaikun, and Zhang, Kai

Subjects
*KEY agreement protocols (Computer network protocols), *WIRELESS sensor networks, *DATA transmission systems
Abstract

Recently, wireless sensor networks (WSNs) have been widely used in a variety of fields, and make people's lives more convenient and efficient. However, WSNs are usually deployed in a harsh and insecure environment. Furthermore, sensors with limited hardware resources have a low capacity for data processing and communication. For these reasons, research on efficient and secure real-time authentication and key agreement protocols based on the characteristics of WSNs has gradually attracted the attention of academics. Although many schemes have been proposed, most of them cannot achieve all known security features with satisfactory performance, among which anonymity, N-Factor security, and forward secrecy are the most vulnerable. In order to solve these shortcomings, we propose a new lightweight and anonymous three-factor authentication scheme based on symmetric cryptographic primitives for WSNs. By using the automated security verification tool ProVerif, BAN-logic verification, and an informal security analysis, we prove that our proposed scheme is secure and realizes all known security features in WSNs. Moreover, we show that our proposed scheme is practical and efficient through the comparison of security features and performance. [ABSTRACT FROM AUTHOR]

Published
2022
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31. Research on the quick identification of Digital Meter based on the intelligent template match.

Author

Zhu Lianghong and Cui Hongwei

Abstract

During the developing of Digital Meter System inspection, the accurate and quick code identification shall be required. It needs quick refresh rate and more numbers. This essay refers to a quick identification of Digital Meter based on the intelligent template match. The digital image to be identified is turned into a binary image, which is simple and has the same dimension with template. Then quick match identification begins. It is proved that this method can meet the identification requirements completely, the higher accuracy, simple and less calculation, quick identification. [ABSTRACT FROM PUBLISHER]

Published
2012
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