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检索条件"机构=Science and Technology on Ship Integrated Power System Technology Laboratory"

共 390 条记录，以下是151-160 订阅

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Sensitivity analyses of steam generator tube thickness on induced-sgtr in sbo accident

引用

2013 International Conference on Energy Research and power Engineering, ERPE 2013

作者： Qiu, Jin-Rong Peng, Chang-Hong Guo, Yun Laboratory on Steam Power System Wuhan Second Ship Design and Research Institute Wuhan Hubei 430064 China School of Nuclear Science and Technology University of Science and Technology of China Hefei Anhui 230026 China

ISBN: (纸本)9783037857588

For nuclear power plant, station black- out (SBO) is the events that contribute significantly to the level-I core damage risk. For an SBO, it is assumed that both the off-site power and on-site diesel generators fail to supply alternating-current power for the plant systems. SBO induced steam generator tube rupture (SGTR) is a concern because the steam generator (SG) tubes are parts of the reactor coolant pressure boundary and failure of the SG tubes may lead to fission products bypassing the containment. The SG tube integrity may be challenged by high temperature and high pressure conditions and may have a potential to fail due to creep rupture. This study focuses on the probability of SBO induced SGTR accidents under the station blackout (SBO) with RCS integrity, seal LOCA and steam relief valves remaining stuck open for the reference plant. At last, the sensitivity of the tube thick is studied. © (2013) Trans Tech Publications Switzerland.

关键词： Accidents

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Impact analysis of DRFM-based active jamming to radar detection efficiency

Impact analysis of DRFM-based active jamming to radar detect...

引用

IET International Radar Conference 2018, IRC 2018

作者： Liu, Wei Meng, Jin Zhou, Liang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan430033 China

The influence of DRFM active jamming technology on pulse compression coherent radar is studied here. By establishing radar signal detection model and introducing radar equation, the influence of signal produced by DRFM on the detection performance of radar receiver is analysed, and the relationship between radar detection probability and interference power is obtained. Finally, the effective index for judging the jamming effect is summarised, and the range of effective jamming signal power is determined. © 2019 Institution of Engineering and technology. All rights reserved.

关键词： Radar receivers

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Research on flexible control algorithm for acceleration/deceleration in heavy-duty motion 2

Research on flexible control algorithm for acceleration/dece...

引用

2nd International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2019

作者： Yuan, Lei Xu, Mingjin Wu, Zhenxing Xu, Jin Naval University of Engineering Wuhan430033 China Nation Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430033 China

An algorithm for acceleration/deceleration control is proposed in this paper to improve the flexibility of the heavy-duty motion system. The algorithm is based on the five-segment S-type acceleration/deceleration curve. During the acceleration switching time, a circular arc is used to smooth the curve, and the running time of each stage could be reasonably allocated by cyclic iteration. A parameter is defined to quantify the degree of flexibility of the acceleration/deceleration process to match the actual project. This paper will build the model to compare the good and bad point of different algorithms. The result shows that the vibration and impact during the acceleration and deceleration process can be effectively reduced, which means that the flexibility of the system has been greatly improved. © 2019 IOP Publishing Ltd.

关键词： Acceleration

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The Study of Epoxy-Impregnated REBCO Coils

The Study of Epoxy-Impregnated REBCO Coils

引用

2020 IEEE International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD 2020

作者： Li, W.Y. Zheng, J. Peng, S.S. Niu, X.J. Dai, Y.J. Chen, W. Guo, X.H. Wuhan Institute of Marine Electric Propulsion National Key Laboratory of Science and Technology on Vessel Integrated Power System Wu'han430064 China

ISBN: (纸本)9781728152158

REBCO coil is a promising technology for propulsion motor. Although degradation was discovered in epoxy impregnated coil, it is essential to fill the coil with epoxy in such occasion. This paper describes preparation of epoxy-impregnated REBCO coils with tapes from three different Manufacturers. All the coils were tested both before and after epoxy impregnation, consistency of Ic value and high n-value suggest that there's no degradation in these coils. The epoxy-impregnated REBCO coil can go though fast cooling and warming processing five times without degradation, which also assured the high quality of the coils. © 2020 IEEE.

关键词： degradation-free double pancake coil epoxy-impregnated REBCO tape

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A Review of Circuit Models for GaN power Devices 6

A Review of Circuit Models for GaN Power Devices

引用

6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Luo, Di Liu, Xiaohu Wang, Ruitian Li, Xin Naval University of Engineering National Key Laboratory of Science Technology on Vessel Integrated Power System Wuhan China Military Electrical Science and Technology Institute Naval University of Engineering Wuhan China

ISBN: (纸本)9798350346671

GaN devices offer superior performance over Si devices, such as higher mobility, breakdown voltage, switching speed and per-width power density. In the future, GaN devices are expected to surpass Si devices in almost all performance indicators, thereby achieving high-speed and efficient power electronic systems (PES). The model of GaN device is a useful and necessary tool to analyze and evaluate its impact on circuit and system performance, which can help researchers design new PES. This paper reviews latest advances on the models of GaN power devices, and discusses the working principles of GaN, the classification and contributions of GaN model, for understanding the significance of these recent developments. In addition, this paper also considers the challenges and problems encountered in the modeling and application of GaN devices, such as self-heating effect, trap effect and short channel effect, providing guidance for future modeling. This review helps readers understand and use the GaN model to achieve more effective design of GaN-based converters. © 2023 IEEE.

关键词： Gallium nitride

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RESEARCH ON THE FILM THICKNESS CHARACTERISTICS OF JET CONDENSER NOZZLE 31

RESEARCH ON THE FILM THICKNESS CHARACTERISTICS OF JET CONDEN...

引用

2024 31st International Conference on Nuclear Engineering, ICONE 2024

作者： Weiyu, Chu Chonghai, Huang Qi, Xiao Zhaoming, Meng Yilin, Fu Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin China Science and Technology on Thermal Energy and Power Laboratory Wuhan Second Ship Design and Research Institute Wuhan China

ISBN: (纸本)9780791888261

Owing to the expansive applicability of jet condensers across diverse sectors, juxtaposed with the paucity of scholarly investigation into the morphological characteristics of the condenser liquid film, the present study zeroes in on the determinants of film thickness attributable to jet condenser nozzles. In pursuit of this objective, we engineered and actualized a visualization experimental apparatus tailored for the meticulous examination of the film-forming propensities of such nozzles. Subsequent experimental endeavors focused on the dynamics of nozzle-induced spray film genesis. Leveraging bespoke measurement techniques, this inquiry delved into the influence of varied parameters including flow rate and nozzle angle, on the film thickness engendered by the nozzles, thereby elucidating discernible trends in the phenotypical attributes of nozzle film thickness. Findings from this research suggest a proportional relationship between film thickness and flow rate, and an inverse correlation between nozzle diameter and film thickness. These insights furnish empirical underpinnings for the refinement of nozzle configurations in jet condensers, thereby contributing to the enhancement of their operational efficacy. © 2024 by ASME.

关键词： Film thickness

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A Direct Control for Stand-Alone Operation Brushless Doubly Fed Induction Generator Using Sliding-Mode Control Approach

A Direct Control for Stand-Alone Operation Brushless Doubly ...

引用

International Conference on Electrical Machines and systems (ICEMS)

作者： Kai Ji Wenfeng Long Jinping He Science and Technology on Ship Integrated Power System Technology Laboratory Wuhan Institute of Marine Electric Propulsion WuHan China

This paper presents a super-twisting sliding mode direct control (SSM-DC) strategy brushless doubly fed induction generator (BDFIG) for variable speed constant frequency wind energy conversion system. The proposed SSM-DC strategy employs a resonant based super-twisting sliding mode control scheme to directly control the required control winding stator voltage so as to eliminate the power winding stator flux instantaneous errors, without synchronous rotating coordinate transformation involving. The stability, robustness and convergence capability of the proposed control strategy were described and analyzed. Thank to no extra inner control loops involved, thus enhancing the transient performance. Constant converter switching frequency was achieved by using space vector modulation, which reduce the voltage harmonic of generator terminal. In addition, the feasibility and validity of the proposed scheme is prove by simulation results, then, enhanced transient performance and steady-state harmonic spectra is achieved.

关键词： Stator windings Resonant frequency Voltage control Harmonic analysis power system stability Windings

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Broadband power Amplifiers Behavioral Modeling Method Based on Instantaneous Input power 3

Broadband Power Amplifiers Behavioral Modeling Method Based ...

引用

3rd IEEE International Conference on Electronic Information and Communication technology, ICEICT 2020

作者： Li, Wei Bian, Hongwei Meng, Jin Zhang, Jiahao Li, Yi National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China Faculty of Electrical Engineering Naval University of Engineering Wuhan China

ISBN: (纸本)9781728190457

This paper presents a novel Augmented Memory Polynomial (AMP) model for the broadband radio frequency high power amplifiers behavioral modeling and digital predistortion. The proposed model consists of a weighted memoryless sub model and a weighted memory sub model. The weighted memoryless sub model involving a weighting, polynomial error signal, and de-weighting parts is used for predicting the strong static nonlinear behaviors of the power amplifiers. The weighted memory sub model is used for the dynamic memory nonlinearity by introducing an instantaneous power dependent weight function into the static and dynamic terms of the conventional memory polynomial (CMP) model. The performance of the proposed model is assessed in terms of in-band and out-of-band errors, such as normalized mean square error (NSME) and adjacent channel power ratio (ACPR). Compared with the CMP, the weighted memory polynomial (WMP) is complex in computation due to the numbers of model coefficient. Furthermore, the proposed method is applied to the digital predistortion so as to cancel the nonlinearity of the power amplifier. The experimental results show that the proposed for modelling the power amplifier and applying the digital predistortion is feasible and effective because it can result in up to 10dB improvement in the ACPR for the same number of coefficients. © 2020 IEEE.

关键词： power amplifiers

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Analysis and study of skewed slot tooth distance on low electromagnetic noise of three-phase induction motor with squirrel cage rotor

Analysis and study of skewed slot tooth distance on low elec...

引用

2012 6th International Conference on Electromagnetic Field Problems and Applications, ICEF'2012

作者： Zhu, Houquan Zhou, Guihou Chen, Jin Liu, Hailong Huazhong University of Science and Technology Wuhan China Wuhan Institute of Marine Electric Propulsion Wuhan China National Key Laboratory for Vessel Integrated Power System Technology Wuhan China

ISBN: (纸本)9781467313353

This paper studies the electromagnetic noise and vibration of three-phase induction motor with squirrel cage rotor affected by different skewed slots tooth distance. For low electromagnetic noise motor, a traditional method which recommending skewed slot tooth distance of the rotor is equal to one pitch of the stator is not optimal. A new method is proposed in which the coefficient factor is coupled to the stator when considering the behavior of the skewed slot by theoretical derivation and analysis in the influence of skewed slot rotor on the radial magnetic force. It is easy and effective to analyze the harmonic Magnetic Motive Force(MMF) and estimate the effect of skewed slot on reducing main magnetic noise caused by some specific electromagnetic force harmonic when the proper skewed slot tooth distance is selected. Electromagnetic finite analysis coupling electromagnetic field-circuit based on "multi-slice method" is investigated on skewed slot squirrel cage rotor, and simulation on three different skewed slots motor is discussed by this method. Three prototype machines using rotors with different skewed slots tooth distance are developed to validate the applicability of this method and examine the accuracy of the simulation results. In conclusion, its calculation results agree with the test results well. © 2012 IEEE.

关键词： Stators

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Studies on microwave non-thermal sterilization enhanced by Ag@TiO2 core-shell particles 4

Studies on microwave non-thermal sterilization enhanced by A...

引用

4th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2021

作者： Zhang, Rong Liang, Fei Su, Li Zhang, Jiahao Huang, Liyang Jin, Xiaomeng Wang, Miaohua School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China College of Life Science and Technology Huazhong University of Science and Technology Wuhan China National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781665432030

Microwave is widely used in the inactivation of microorganisms, but its low energy efficiency and high heating temperature limit its application scenarios. This paper hopes to solve this problem by preparing microwave non-thermal effect enhancer. In this study, the inactivation performance of nano-Ag, TiO2 and Ag@TiO2 on bacteria under microwave radiation were compared. The results show that Ag@TiO2 has a unique enhancement effect on microwave sterilization. ©2021 IEEE

关键词： Core shell nanoparticles

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