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Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 2,   Pages 109-117 doi: 10.1007/s11465-013-0252-z

Abstract:

A neural-network (NN)-based active control system was proposed to reduce the low frequency noise radiationMulti-frequency control in frequency domain was achieved by simulation through the NN-based control systems

Keywords： active vibration control (AVC)     neural network (NN)     low frequency noise     frequency domain control     multi-frequency    

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Integrated virtual-design methods for forecasting radiated noise of single cylinder diesel block

GUO Lei, HAO Zhiyong, XU Hongmei, LIU Lianyun

Frontiers in Energy 2008, Volume 2, Issue 4,   Pages 416-421 doi: 10.1007/s11708-008-0097-z

Abstract: The frequency response of the block was calculated using the finite element method (FEM).Finally, the radiated noise such as sound power level and efficiency in the out sound field were obtained

Keywords： bearing     dynamical     frequency response     dynamical simulation     hybrid dynamical    

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Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems

Le YANG, Shuo WANG, Jianghua FENG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3,   Pages 329-353 doi: 10.1007/s11465-018-0466-1

Abstract: interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequencyUnlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled withinduction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequencyEMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter,

Keywords： variable-frequency drive (VFD)     electromagnetic interference (EMI)     motor drive modeling     EMI noise suppression    

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Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 446-472 doi: 10.1007/s11709-019-0605-8

Abstract: Most of denoising methods fail to filter such noise properly.Both the signal-to-noise ratio and the peak signal-to-noise ratio are small.

Keywords： ambient vibration test     high level noise     iterative signal enhancement     wavelet     cross and autocorrelation    

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Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

Frontiers in Energy 2009, Volume 3, Issue 1,   Pages 80-84 doi: 10.1007/s11708-009-0008-y

Abstract: A brief review is presented on previous experimental results and correlations on the friction factor of cryocooler regenerators operating at oscillating flow and pulsating pressure conditions, for different mesh sizes of packed woven screens, focusing on the effects of different operating frequencies ranging from 20 to 80 Hz, at room and cryogenic temperatures. A comparison of the friction factor data with those of other studies is presented to clarify the reason for the difference. Finally, a new oscillating flow correlation of regenerators, in terms of several non-dimensional parameters, is discussed and compared.

Keywords： friction factor     regenerator     oscillating flow     high frequency    

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Improving retrieval precision of NO

Jinpeng YANG

Frontiers of Mechanical Engineering 2009, Volume 4, Issue 1,   Pages 92-96 doi: 10.1007/s11465-009-0001-5

Abstract: The NO density error retrieved by the traditional method of differential optical absorption spectroscopy (DOAS) was analyzed. The technique for reducing the error is proposed and used to obtain the NO density of Chengdu through DOAS.

Keywords： absorption structure     low-frequency structure     absorption cross-section     NO2 density    

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Analysis and design of pulse frequency modulation dielectric barrier discharge for low power applications

Tang-tang GUO,Xing-liang LIU,Shi-qiang HAO,Chi ZHANG,Xiang-ning HE

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 3,   Pages 249-258 doi: 10.1631/FITEE.1400185

Abstract: For low power dielectric barrier discharge (DBD) used in small-size material treatment or portable devicesIn this paper, steady-state analysis of the low power DBD is presented, considering the inevitable parasiticfirst harmonic approximation (RCFHA) is applied to linearize the equivalent load circuit of DBD at lowfrequency and the derived expressions are accurate and convenient for the analysis and design of therange and the applied electrode voltage, is discussed when the power is regulated with pulse frequency

Keywords： Dielectric barrier discharge     Rectifier-compensated first harmonic approximation     Parasitic capacitance     Power converter design    

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Analysis and design of transformer-based CMOS ultra-wideband millimeter-wave circuits for wireless applications: a review Review Articles

Yi-ming YU, Kai KANG

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 1,   Pages 97-115 doi: 10.1631/FITEE.1900491

Abstract: First, we introduce a mm-Wave low-noise amplifier with transformer-based Gm-boosting and pole-tuningIt achieves wide operating bandwidth, low noise figure, and good gain performance.injection-current-boosting tech-nique which can significantly increase the locking range of mm-Wave injection-locked frequency

Keywords： CMOS     Millimeter-wave (mm-Wave)     Ultra-wideband     Transformer     Low-noise amplifier     Injection-locked fre-quencytripler     Injection-locked frequency divider     Mixer    

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Addressing Frequency Control Challenges in Future Low-Inertia Power Systems: A Great Britain Perspective Perspective

Qiteng Hong, Md Asif Uddin Khan, Callum Henderson, Agustí Egea-Àlvarez, Dimitrios Tzelepis, Campbell Booth

Engineering 2021, Volume 7, Issue 8,   Pages 1057-1063 doi: 10.1016/j.eng.2021.06.005

Abstract: This paper presents opinions and insights on the challenges associated with frequency control in a low-inertiatechniques that act over different time scales: synchronous condensers, inertia emulation, and fast frequencyrecent research and development projects in GB, along with the opinions on their roles in addressing the frequencycontrol challenges in future low-inertia systems.

Keywords： Fast frequency control     Inertia emulation     Synchronous compensation     Low-inertia systems    

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Improvement to observability measures of LFO modes in power systems with DFIGs

Shenghu LI

Frontiers in Energy 2021, Volume 15, Issue 2,   Pages 539-549 doi: 10.1007/s11708-019-0617-z

Abstract: Observation of the low-frequency oscillation (LFO) modes in power systems is important to design the

Keywords： wind power system     low-frequency oscillation (LFO)     observability measure     sensitivity     doubly-fed induction    

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The Extremely Low Frequency Engineering Project for Underground Exploration

Jianxun Lu,Xianjun Zhuo,Yong Liu,Guoze Zhao,Qingyun Di,

Engineering 2022, Volume 10, Issue 3,   Pages 13-20 doi: 10.1016/j.eng.2021.12.003

Keywords： EngineeringAchievements    

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Design of noise-reduction seats for high-speed trains

Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 3,   Pages 385-389 doi: 10.1007/s11465-017-0438-x

Abstract: reduce noise.interior noise spectral characteristics.improved sound-absorption coefficient in the entire frequency band.seats substantially reduced the noise in an entire train car.Therefore, the noise-reduction seats are effective in noise reduction.

Keywords： high-speed train     sound-absorbing materials     perforated board     noise-reduction seats    

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Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5,   Pages 449-457 doi: 10.1631/FITEE.1500262

Abstract: Noise statistics are essential for estimation performance.In practical situations, however, a priori information of noise statistics is often imperfect.Previous work on noise statistics identification in linear systems still requires initial prior knowledgeof the noise.Then by applying state estimates obtained from the H∞ filter, better estimates of the noise mean and

Keywords： Noise estimate     H∞     filter     Target tracking    

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The extremely low frequency engineering project using WEM for underground exploration

Zhuo Xianjun,Lu Jianxun,Zhao Guoze,Di Qingyun

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 42-50

Abstract:

The ELF (extremely low frequency) engineering project for underground

Keywords： wireless electro-magnetic method（WEM）     resource exploration     earthquake predication    

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Ambient Noise Tomography for Coral Islands Article

Shaohong Xia, Changrong Zhang, Jinghe Cao

Engineering 2023, Volume 25, Issue 6,   Pages 182-193 doi: 10.1016/j.eng.2021.09.022

Abstract: characteristics and obtained a 3D subsurface structure of the coral island using ambient noise tomographyWe made the following findings: ① The ambient noise frequencies can be roughly categorized into threeThe spectral characteristics of the noise below 5 Hz were consistent at different stations, but therewere significant differences in the characteristics of the noise above 5 Hz. ② For ambient noise frequenciesthe high degree of cementation of the outer reef flat stratum on the seaward side. ④ There were two low-velocity

Keywords： Coral island     Ambient noise tomography     Engineering geology     South China Sea    

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Title Author Date Type Operation

Frequency domain a9ctive vibration control of a flexible plate based on neural networks

Jinxin LIU, Xuefeng CHEN, Zhengjia HE

Journal Article

Integrated virtual-design methods for forecasting radiated noise of single cylinder diesel block

GUO Lei, HAO Zhiyong, XU Hongmei, LIU Lianyun

Journal Article

Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems

Le YANG, Shuo WANG, Jianghua FENG

Journal Article

Wavelet-based iterative data enhancement for implementation in purification of modal frequency for extremely

Hassan YOUSEFI, Alireza TAGHAVI KANI, Iradj MAHMOUDZADEH KANI, Soheil MOHAMMADI

Journal Article

Comparative study of oscillating flow characteristics of cryocooler regenerator at low temperatures

Yonglin JU , Qingqing SHEN ,

Journal Article

Improving retrieval precision of NO

Jinpeng YANG

Journal Article

Analysis and design of pulse frequency modulation dielectric barrier discharge for low power applications

Tang-tang GUO,Xing-liang LIU,Shi-qiang HAO,Chi ZHANG,Xiang-ning HE

Journal Article

Analysis and design of transformer-based CMOS ultra-wideband millimeter-wave circuits for wireless applications: a review

Yi-ming YU, Kai KANG

Journal Article

Addressing Frequency Control Challenges in Future Low-Inertia Power Systems: A Great Britain Perspective

Qiteng Hong, Md Asif Uddin Khan, Callum Henderson, Agustí Egea-Àlvarez, Dimitrios Tzelepis, Campbell Booth

Journal Article

Improvement to observability measures of LFO modes in power systems with DFIGs

Shenghu LI

Journal Article

The Extremely Low Frequency Engineering Project for Underground Exploration

Jianxun Lu,Xianjun Zhuo,Yong Liu,Guoze Zhao,Qingyun Di,

Journal Article

Design of noise-reduction seats for high-speed trains

Xiaojun DENG, Yanju ZHAO, Haijin ZHANG, Renzhong SHUAI, Leiwei ZHU

Journal Article

Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

Journal Article

The extremely low frequency engineering project using WEM for underground exploration

Zhuo Xianjun,Lu Jianxun,Zhao Guoze,Di Qingyun

Journal Article

Ambient Noise Tomography for Coral Islands

Shaohong Xia, Changrong Zhang, Jinghe Cao

Journal Article