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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Li, Wanjing Ji, Kai Shao, Zimin Liu, Bangyin Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China Wuhan Institute of Marine Electric Propulsion Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

In the wireless power transmission system, DC-DC converter is often cascaded in order to achieve power regulation. However, due to the constant current source characteristics of the dual LCC compensation topology, the right-half-plane (RHP) zero is introduced in the control of the DC-DC converter, which leads to the deterioration of the dynamic performance of the system or even make the system unstable. This article will propose a double closed loop power control method, and the influence of the RHP zero on the stability and dynamic performance of the system is analyzed. The proposed control method does not rely on the communication between primary and secondary sides. Through experiment, the overshoot of the system has been improved, which is less than 10%. © 2022 IEEE.

关键词： power control

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Multi-stage attack weapon target allocation method based on defense area analysis

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Journal of systems Engineering and Electronics 2020年第3期31卷 539-550页

作者： JIA Zhengrong LU Faxing WANG Hangyu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China College of Weaponry Engineering Naval University of EngineeringWuhan 430033China

For better reflecting the interactive defense between targets in practical combat scenarios,the basic weapon-target allocation(WTA)framework needs to be improved.A multi-stage attack WTA method is ***,a defense area analysis is presented according to the targets’positions and the radii of the defense areas to analyze the interactive coverage and protection between targets’defense ***,with the coverage status and coverage layer number,a multi-stage attack planning method is proposed and the multi-stage attack objective function model is *** is conducted with interactive defense combat scenarios,the traditional WTA method and the multi-stage WTA method are compared,and the objective function model is validated with the Monte-Carlo *** results suggest that if the combat scenario involves interactive coverage of targets’defense areas,it is imperative to analyze the defense areas and apply the multi-stage attack method to weakening the target defense progressively for better combat effectiveness.

关键词： weapon-target allocation(WTA) defense area analysis combat effective analysis

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Line width mathematical model in fused deposition modelling for precision manufacturing 2

Line width mathematical model in fused deposition modelling ...

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2020 2nd International Conference on power, Energy and Electrical Engineering, PEEE 2020

作者： Jiang, J.C. Xu, Xinghua Rui, Wanzhi Jia, Zhengrong Ping, Zuowei National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

Additive manufacturing is becoming increasingly popular because of its unique advantages, especially fused deposition modelling (FDM) which has been widely used due to its simplicity and comparatively low price. However, in current FDM processes, it is difficult to fabricate parts with highly accurate dimensions. One of the reasons is due to the slicing process of 3D models. Current slicing software divides the parts into layers and then lines (paths) based on a fixed value. However, in a real printing process, the printed line width will change when the process parameters are set in different values. The various printed widths may result in inaccuracy of printed dimensions of parts if using a fixed value for slicing. In this paper, a mathematical model is proposed to predict the printed line width in different layer heights. Based on this model, a method is proposed for calculating the optimal width value for slicing 3D parts. In the future, the proposed mathematical model can be integrated into slicing software to slice 3D models for precision additive manufacturing. © The Authors, published by EDP sciences, 2021.

关键词： Fused Deposition Modeling

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On the improvement of power conversion efficiency of parametric arrays

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Chinese Journal of Acoustics 2023年第4期42卷 450-463页

作者： LU Zhimiao MENG Jin WANG Bo ZHAO Zhihua HU Anqi National Key Laboratory of Science and Technology on Vessel Integrated Power System Technology Naval University of EngineeringWuhan 430000

Due to the low power conversion efficiency of parametric array, the proposed method can be used to improve the power conversion efficiencies of parametric arrays by adjusting the specific acoustic impedance. The Kuznetsov equation that describes parametric arrays is first studied, the inffuence of Lagrangian densities on difference frequency wave is analyzed,and the relationship between the Lagrangian density and the acoustic impedance is ***, the method of arranging perforated plates around the parametric array to adjust the acoustic impedance is proposed. The proposed method is validated through numerical simulations. The results show that this method can improve the power conversion efficiency of the parametric array by using perforated plates to change the acoustic impedance.

关键词： parametric impedance method

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FPGA Implementation of High-throughput, Low-latency Complex LMS Algorithm

FPGA Implementation of High-throughput, Low-latency Complex ...

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2019 IEEE International Conference on Signal, Information and Data Processing, ICSIDP 2019

作者： Liu, Yongcai Ge, Songhu Xing, Jinling Cui, Zhongpu Meng, Jin National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering China

ISBN: (纸本)9781728123455

This paper presents the FPGA implementation results of the LMS algorithm with complex input/output data. The implementation is fulfilled based on Xilinx system generator in a graphical programming manner, and demonstrated on Xilinx KC705 evaluation board. It is shown that complex LMS algorithm, regardless of the order of filter, can support more than 200 million-samples-per-second (Msps) throughput rate when 16-bit complex input/output data are considered, with latency of 3 or 4 clock periods (i.e. 15ns or 20ns when clock frequency is 200MHz). © 2019 IEEE.

关键词： Computer graphics

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Strain Rate Effect of Armature Material for Electromagnetic Rail Launcher 13

Strain Rate Effect of Armature Material for Electromagnetic ...

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13th International Symposium on Linear Drives for Industry Applications, LDIA 2021

作者： Du, Peipei Lu, Junyong Li, Kai Feng, Junhong Li, Xiangping The National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering China

ISBN: (纸本)9781728172101

During the sliding contact between the armature and the rail of the electromagnetic rail launcher, the armature material has serious wear and failure. In order to accurately predict the failure process of the armature, the ZwickHTM5020 high-speed tensile testing machine is used to carry out the strain rate 1 s-1, 10 s-1, 100 s-1, 1000 s-1 and other working conditions of the armature material mechanical performance test, and the VIC-2D ultra-high-speed non-contact strain measurement system is used to carry out the armature material strain test in the dynamic stretching process. Experimental studies have found that the armature material for battery track transmitters has a certain strain strengthening effect. It is found that with the increase of the strain rate, the yield strength of the armature material increases from 400 MPa to 462 MPa, and the failure strength increases from 480 MPa to 525 MPa, which has important application value for the maximum design of armature. © 2021 IEEE

关键词： Strain rate

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Crack-SegNet: Surface Crack Detection in Complex Background Using Encoder-Decoder Architecture 4

Crack-SegNet: Surface Crack Detection in Complex Background ...

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4th International Conference on Sensors, Signal and Image Processing, SSIP 2021

作者： Ran, Rong Xu, Xinghua Qiu, Shaohua Cui, Xiaopeng Wu, Fuhui National Key Laboratory Of Science And Technology On Vessel Integrated Power System Naval University Of Engineering China

ISBN: (纸本)9781450385725

Timely and accurate detection of the initiation and expansion of crack is of great significance for improving safe operation of civil infrastructures. Image-based visual surface inspection has been an indispensable way for long-time infrastructure monitoring. However, existing crack detection methods generally suffer from the interference of complex background, leading to obvious performance drops. To tackle this, an improved encoder-decoder architecture based on SegNet is proposed in this paper, namely crack-SegNet. The encoder network hierarchically learns visual features from the original image, and the decoder network gradually up-samples and maps the encoded features to the input size for the pixel-level classification. In order to enhance the feature capacity of cracks in complex background, a channel attention mechanism is integrated into the encoder, as well as a spatial attention module in the decoder to improve the feature representation of cracks. Meanwhile, a spatial pyramid pooling is also attached to the last convolutional layer of the encoder to capture crack with different scales. To better validate the proposed method, a challenging metal surface crack dataset with much more complex background is collected. Experimental results on the datasets show that the proposed crack-SegNet outperforms other state-of-the-art crack detection methods, especially in complex background. © 2021 ACM.

关键词： Semantic Segmentation

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Secure Transmission for NOMA systems with Imperfect SIC

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China Communications 2020年第11期17卷 67-78页

作者： Zhongwu Xiang Xiaobing Tong Yueming Cai College of Communications Engineering Army Engineering University of PLANanjing 210007China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

This paper investigates secure transmission for non-orthogonal multiple access(NOMA)systems where the imperfect successive interference cancellation(SIC)is considered at both legitimate users and eavesdropper(Eve).A power allocation scheme is designed for the legitimate users to mitigate the effect of the SIC error caused by imperfect *** characterizing the secrecy performance of the NOMA system,the closed-form expressions for connection outage probability(COP),secrecy outage probability(SOP),and effective secrecy throughput(EST)are derived over Nakagami-m fading channels in both NOMA and benchmark orthogonal multiple access(OMA)*** also provide security and reliability trade-off results(SRT)for the users in the NOMA and OMA *** results verify our analysis and show that the strong users achieve better secrecy performance but worse reliability performance and NOMA outperforms OMA in terms of SRT.

关键词： physical layer security non-orthogonal multiple access imperfect SIC security and reliability trade-off

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Design and Implementation of a 150kW High Frequency Transformer in High Voltage Large power Solid State Transformer Consist of Multi-DABs

Design and Implementation of a 150kW High Frequency Transfor...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Jinping He Kai Ji Nianzhou Liu Derong Lin Science and Technology on Ship Integrated Power System Technology Laboratory WuHan China

ISBN: (纸本)9781728133997

This paper mainly focus on the design and implementation methods of a 150kW high power high frequency transformer (HPHFT) in high voltage solid state transformer consist of multi-DABs (Dual Active Bridges). Based on theoretical analysis and design experience, the detailed calculation process of winding loss considering skin effect and proximity effect is given and also the loss calculation method of nanocrystalline materials. Then some other aspects of the design process, such as winding structure, insulation and so on, are introduced. At last, a prototype of a 150kW high frequency transformer was implemented, experimental results of the proposed transformer coincide with the design.

关键词： Windings power transformer insulation Magnetic cores Resistance Proximity effects

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Analysis and Experimental Validation of Rotor Optimal Design on the Noise Reduction of Permanent Magnet Synchronous Motor for Electric Vehicle

Analysis and Experimental Validation of Rotor Optimal Design...

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International Conference on Electrical Machines and systems (ICEMS)

作者： Yang Liu Xiaohui Xu Gao Yang Changpeng Lv Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan China

ISBN: (纸本)9781728133997

Since permanent magnet synchronous motor (PMSM) is the key component of electric vehicle (EV) propulsion system, the noise, vibration and harshness (NVH) behavior of PMSMs is essential to the riding amenity of EVs. The noise performances of PMSMs are mainly caused by the electromagnetic forces and can be amplified by the mechanical structure. Therefore, in this paper, the electromagnetic forces are comprehensively studied in terms of time and spatial harmonic distributions with the employment of 2D finite element analysis (FEA) and Fourier transformation (FFT) under different operating conditions. Then, in order to improve the noise performance, an optimal design of the rotor is proposed to minimize the radial electromagnetic force. Finally, the effectiveness of the optimal rotor design is verified by both anechoic chamber test and real vehicle test.

关键词： Harmonic analysis Electromagnetic forces Force Rotors Stator windings Vibrations

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