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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 systemsA pre-testing experiment of the control system on a real simply supported plate was conducted.The NN-based control algorithm was shown to perform effectively.These works lay a solid foundation for the active vibration control of mechanical structures.

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

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Diversity Glass Antennas for Tri-Band WiFi Applications Article

Peng Fei Hu, Kwok Wa Leung, Kwai Man Luk, Yong Mei Pan, Shao Yong Zheng

Engineering 2023, Volume 23, Issue 4,   Pages 157-169 doi: 10.1016/j.eng.2022.09.011

Abstract:

This paper investigates two novel polarization- and pattern-diversity glass dielectric resonator antennas (DRAs), both of which are for tri-band (2.4, 5.2, and 5.8 GHz) wireless fidelity (WiFi) applications. It also investigates what type of diversity antenna is most suitable for WiFi router applications by comparing the two DRAs, along with a new space-diversity glass DRA. These three diversity glass DRAs are also compared with a commercial space-diversity monopole pair to benchmark the performance of the glass DRA in WiFi router applications. In our polarization-diversity antenna, a double-port feeding scheme is developed to excite different DRA modes. The frequencies of the DRA modes are tuned by using a stepped DRA. For the pattern-diversity design, a stacked DRA is introduced to broaden the bandwidth for both the conical and broadside radiation modes. All three of the new diversity antennas were fabricated and measured to verify the simulations. In our experiment, the bit error rate (BER) of the three diversity glass antennas and the reference space-diversity monopole antenna was also measured, and the results are compared and discussed. It is found that the polarization-diversity omnidirectional DRA has the most stable BER among the three.
 

Keywords： WiFi Diversity antennas Multi-frequency     Glass     Dielectric resonator antennas     Multiple-input multiple-output    

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Impact of wind power generating system integration on frequency stabilization in multi-area power system

Y. K. BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

Frontiers in Energy 2015, Volume 9, Issue 1,   Pages 7-21 doi: 10.1007/s11708-014-0338-2

Abstract: inertial support because of power electronic converters between the grid and the WPGS to facilitate frequencyThe proposed control strategy suggests a substantial contribution to system inertia in terms of short-termThe control scheme uses fuzzy logic based design and takes frequency deviation as input to provide quickactive power support, which balances the drop in frequency and tie-line power during transient conditionsSimulation results advocates the justification of control scheme over other schemes.

Keywords： two area power system     automatic generation control     wind power generating system (WPGS)     deregulated environment    

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Capacity limitation of nuclear units in grid based on analysis of frequency regulation

Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN

Frontiers in Energy 2012, Volume 6, Issue 2,   Pages 148-154 doi: 10.1007/s11708-012-0174-1

Abstract: Based on the analysis of frequency regulation, mathematic models for nuclear units in the grid are establishedThe relationship between different styles of frequency regulation and the allowable capacity of the nuclear

Keywords： nuclear units capacity     overspeed     primary frequency control (PFC)     second frequency control (SFC)    

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A comprehensive review of wind power based power system frequency regulation

Frontiers in Energy 2023, Volume 17, Issue 5,   Pages 611-634 doi: 10.1007/s11708-023-0876-6

Abstract: However, its low inertia characteristic may threaten the system frequency stability of the power systemThus, the capability of WP participating in the system frequency regulation has become a research hotspotIn this paper, the impact of WP on power system frequency stability is initially presented.In addition, various existing control strategies of WP participating in frequency regulation are reviewedThe pros and cons of each control strategy are also discussed.

Keywords： frequency regulation strategies     wind turbine generators     grid-forming control     model predictive control    

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Load frequency control in deregulated power system with wind integrated system using fuzzy controller

Yajvender Pal VERMA, Ashwani KUMAR

Frontiers in Energy 2013, Volume 7, Issue 2,   Pages 245-254 doi: 10.1007/s11708-012-0218-6

Abstract: This paper presents the analysis of load frequency control (LFC) of a deregulated two-area hydro-thermaland arrests the initial fall in frequency after disturbance.The inertial control responds to frequency deviations, which takes out the kinetic energy of the windturbine for improving the frequency response of the system.To enhance the participation of the doubly fed induction generator (DFIG) in the frequency control, optimal

Keywords： frequency regulation     fuzzy controller     de-regulated power system     doubly fed induction generator (DFIG)    

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Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Frontiers in Energy 2012, Volume 6, Issue 2,   Pages 184-192 doi: 10.1007/s11708-012-0185-y

Abstract: Thus, it is important that wind turbines also contribute to system frequency control.The frequency deviation is considered by the controller to provide the inertial control.The optimal speed control parameters have been used for the DFIG to increases its participation in frequencycontrol.control.

Keywords： doubly fed induction generator (DFIG)     load frequency control     inertial control     wind energy conversion    

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H∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 3,   Pages 264-275 doi: 10.1007/s11709-013-0214-x

Abstract: floor isolation from the ground motions are filtered by the structure, leaving the majority of the frequencycontent of the input motion lower than the predominant frequency of the structure.Semi-active control with an control was adopted for the floor isolation system and a new input shapingThe control algorithm proved to be more advantageous than passive control because of its capacity toadjust control strategies according to the different motion frequency characteristics.

Keywords： semi-active     floor isolation     H∞ control     MR damper     shaping filter     shaking table    

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Development and testing of a wireless smart toolholder with multi-sensor fusion

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 4, doi: 10.1007/s11465-023-0774-y

Abstract: In this study, we propose a wireless smart toolholder with multi-sensor fusion for simultaneous sensingThereafter, structural design, circular runout, dynamic balancing, static stiffness, and dynamic inherent frequency

Keywords： wireless smart toolholder     multi-sensor fusion     circular runout     dynamic balancing     static stiffness     dynamic inherent frequency    

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Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Frontiers of Mechanical Engineering 2008, Volume 3, Issue 4,   Pages 360-364 doi: 10.1007/s11465-008-0084-4

Abstract: set up the mapping function between a complicated region and a unit dish region, and the fundamental frequencyTaking an elastic rectangle-plate with arc radius as an example, the testing mode frequency band of platesis determined by analyzing the fundamental frequency; meanwhile, according to hamming testing methodof multi-point excitation to the single-point response, and by signal processing technology and itsComparing the first order modal frequency with the theoretical fundament frequency, the validity of the

Keywords： multi-point excitation     rectangle-plate     single-point     processing technology     trigonometric interpolation    

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Motion control of multi-actuator hydraulic systems for mobile machineries: Recent advancements and future

Bing XU, Min CHENG

Frontiers of Mechanical Engineering 2018, Volume 13, Issue 2,   Pages 151-166 doi: 10.1007/s11465-018-0470-5

Abstract:

This paper presents a survey of recent advancements and upcoming trends in motion control technologiesemployed in designing multi-actuator hydraulic systems for mobile machineries.However, motion control technologies of multi-actuator hydraulic systems have faced increasing challengesIn this study, an overview of the evolution of existing throttling control technologies is presented,Then, the advanced operation methods of multi-actuator mobile machineries are reviewed, including coordinated

Keywords： motion control     electrohydraulic control     energy efficiency     mobile machineries    

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Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Strategic Study of CAE 2006, Volume 8, Issue 10,   Pages 66-70

Abstract:

The closed-loop feedback structure of PID generalized predictive control (PID - GPC) is proposed,Further more, the influence of PID - GPC parameter tuning on its robustness is analyzed in frequency

Keywords： predictive control     robustness     frequency domain     small-gain criterion     PID control    

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Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Strategic Study of CAE 2008, Volume 10, Issue 10,   Pages 67-71

Abstract:

Stepped-frequency signal is a broad band signal which enhances rangeBaseband signal that is received in stepped-frequency radar can be thought of as the linear combinationExtended Prony algorithm is applied to stepped-frequency radar, which can obtain more exact target information

Keywords： high resolution radar     stepped-frequency signal     extended Prony’s method     multi-scattering center    

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Shape control of multi-cellular inflatable panels

N. KATAYAMA, K. ISHIMURA, K. MINESUGI, DANIEL J. INMAN

Frontiers of Mechanical Engineering 2013, Volume 8, Issue 3,   Pages 276-282 doi: 10.1007/s11465-013-0267-5

Abstract:

Multi-cellular inflatable structures are ultra-light and robust against membrane damage such as pinholesIn the present study, shape control for a simple multi-cellular inflatable panel was achieved via a novel

Keywords： Membrane structures     inflatable structure     shape control     smart structures     structural mechanics     space engineering    

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Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Frontiers of Structural and Civil Engineering   Pages 981-993 doi: 10.1007/s11709-023-0979-5

Abstract: modeled the moving-vehicle-induced forcing excitation on a single-span prismatic bridge as a multiple frequency-multiplicationThe forced modal responses consist of multiple frequency-multiplication steady-state harmonics and onedamped mono-frequency complementary harmonic.single-span simple beams, the moving vehicle carriage heaving oscillation modulates the beam modal frequency

Keywords： forced vibration     linear Euler beam     moving load     harmonic structure     frequency modulation     end restraints    

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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

Diversity Glass Antennas for Tri-Band WiFi Applications

Peng Fei Hu, Kwok Wa Leung, Kwai Man Luk, Yong Mei Pan, Shao Yong Zheng

Journal Article

Impact of wind power generating system integration on frequency stabilization in multi-area power system

Y. K. BHATESHVAR,H. D. MATHUR,H. SIGUERDIDJANE

Journal Article

Capacity limitation of nuclear units in grid based on analysis of frequency regulation

Yiping DAI, Pan JIANG, Lin GAO, Weimin KAN, Xiaoqing XIAO, Ge JIN

Journal Article

A comprehensive review of wind power based power system frequency regulation

Journal Article

Load frequency control in deregulated power system with wind integrated system using fuzzy controller

Yajvender Pal VERMA, Ashwani KUMAR

Journal Article

Dynamic contribution of variable-speed wind energy conversion system in system frequency regulation

Yajvender Pal VERMA, Ashwani KUMAR

Journal Article

H∞ control in the frequency domain for a semi-active floor isolation system

Yundong SHI, Tracy C BECKER, Masahiro KURATA, Masayoshi NAKASHIMA

Journal Article

Development and testing of a wireless smart toolholder with multi-sensor fusion

Journal Article

Fundamental frequency and testing mode of complicated elastic clamped-plate vibration

QI Hongyuan, GUAN Yiduo

Journal Article

Motion control of multi-actuator hydraulic systems for mobile machineries: Recent advancements and future

Bing XU, Min CHENG

Journal Article

Frequency-domain-based Robustness Analysis for PID Generalized Predictive Control

Wang Fanzhen,Chen Zengqiang,Yao Xiangfeng,Yuan Zhuzhi

Journal Article

Research on Prony’s method modeling in multi-target detection of stepped-frequency radar

Hu Tiling,Li Xingguo

Journal Article

Shape control of multi-cellular inflatable panels

N. KATAYAMA, K. ISHIMURA, K. MINESUGI, DANIEL J. INMAN

Journal Article

Multi-harmonic forced vibration and resonance of simple beams to moving vehicles

Journal Article