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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: Numerical simulations of wind excitations are conducted for the 3D model of the cable stayed bridge withduration of 30 s supporting on real data of a strong wind from the literature.steel beams declared a safer structure against vertical and torsional vibrations and rarely expected flutterwind speed.

Keywords： aeroelastic instability     structural damping     flutter wind speed     bending stiffness     torsional stiffness    

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identifiedfrom the vibration testing data of a sectional model suspended in a wind tunnel.It was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMoreover, some of the flutter derivatives of each of the other two models identified with the two methodsMore precisely, the frequency-domain method usually results in smooth curves of the flutter derivatives

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method    

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A novel method for reliability and risk evaluation of wind energy conversion systems considering windspeed correlation

Seyed Mohsen MIRYOUSEFI AVAL,Amir AHADI,Hosein HAYATI

Frontiers in Energy 2016, Volume 10, Issue 1,   Pages 46-56 doi: 10.1007/s11708-015-0384-4

Abstract: At present, to the best of the authors’ knowledge, wind speed and wind turbine generator outage haveturbines, considering wind speed and wind turbine generator outage.The proposed model is presented in terms of appropriate wind speed modeling as well as capacity outageprobability table (COPT), considering component failures of the wind turbine generators.wind speed in the reliability assessment of the wind farms.

Keywords： doubly-fed induction generator (DFIG)     composite system adequacy assessment     wind speed correlation    

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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: Frequency regulation in a generation mix having large wind power penetration is a critical issue, aswind units isolate from the grid during disturbances with advanced power electronics controllers andThus, it is important that wind turbines also contribute to system frequency control.This paper examines the dynamic contribution of doubly fed induction generator (DFIG)-based wind turbineThe optimal speed control parameters have been used for the DFIG to increases its participation in frequency

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

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Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Frontiers in Energy 2021, Volume 15, Issue 1,   Pages 240-255 doi: 10.1007/s11708-018-0514-x

Abstract: Most wind turbines within wind farms are set up to face a pre-determined wind direction.(MA) wind direction with the aim of maximizing the total power generated on wind farms and minimizingIn the first stage, the optimal wind turbine layouts for 8 different major wind directions were determinedsite specific wind turbine orientation.The results reveal that the proposed wind farm layout improves wind power production capacity with minimum

Keywords： optimal placement     wind turbines     wind direction     genetic algorithm     wake effect    

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Droplet spectra and high-speed wind tunnel evaluation of air induction nozzles

Qing TANG, Liping CHEN, Ruirui ZHANG, Min XU, Gang XU, Tongchuan YI, Bin ZHANG

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 442-454 doi: 10.15302/J-FASE-2017169

Abstract:

A series of air induction nozzles were tested in a high-speed wind tunnel.The results indicated that v and v of the droplets decreased quasi-linearly with increased wind speed, while v was affected by the quadratic of wind speed. v , v and v of the droplets were all proportionalconsisting of droplets with a diameter below 100 mm (%<100 mm) was found to be quadratically related to windspeed, and was not markedly influenced by the spray pressure and orifice size.

Keywords： air induction nozzle     wind tunnel     aerial spray     droplet size spectra    

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Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Strategic Study of CAE 2011, Volume 13, Issue 9,   Pages 8-21

Abstract: of suspension bridges, wind induced vibration of cable-stayed bridges and control of wind-rain inducedThe long-span cable-stayed bridges with a 1 000 m main span have high enough critical flutter speed,but the main aerodynamic concern is rain-wind induced vibration of long stay cables.flutter analysis method as 3D bridge flutter precise analysis, the bridge buffeting frequency-domainanalysis under skew wind action, the bridge flutter and buffeting reliability evaluation method based

Keywords： suspension bridge     cable stayed bridge     arch bridge     flutter instability     buffeting response     vortexinduced vibration     wind-rain induced vibration    

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Evaluation of the wind energy potential of two south west sites in Nigeria

Olaleye M. AMOO

Frontiers in Energy 2012, Volume 6, Issue 3,   Pages 237-246 doi: 10.1007/s11708-012-0201-2

Abstract: Wind resource assessment is a crucial first step in gauging the potential of a site to produce energyfrom wind turbines.In this paper, the wind energy potential of Abeokuta (07°03'N, 03°19'E) and Ijebu-Ode (06°47'N, 03°58The results show that the average annual mean wind speed variation for Abeokuta ranges from 2.2 to 5.0Ijebu-Ode was found to be the better of the two sites in terms of annual variation of mean wind speed

Keywords： wind potential     wind speed     wind power density     wind gust     turbulence intensity     Nigeria    

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Power maximization of variable-speed variable-pitch wind turbines using passive adaptive neural fault

Hamed HABIBI, Hamed RAHIMI NOHOOJI, Ian HOWARD

Frontiers of Mechanical Engineering 2017, Volume 12, Issue 3,   Pages 377-388 doi: 10.1007/s11465-017-0431-4

Abstract:

Power maximization has always been a practical consideration in wind turbines.This paper studies the control methodology for variable-speed variable-pitch wind turbines includingThe nonlinear model of the wind turbine is presented, and the problem of maximizing extracted energynonlinear controller is designed; then, to handle uncertainties, the unknown nonlinearities of the windspeed and model noises, and completely unknown actuator faults including generator torque and pitch

Keywords： wind turbine nonlinear model     maximum power tracking     passive fault tolerant control     adaptive neural control    

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Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 272-278 doi: 10.1007/s11709-009-0042-1

Abstract: of self-excited aerodynamic force of bridge are interpreted from such two aspects as amplitude and windThe concept of “generalized flutter derivative” is proposed, and its physical meaning isThe graphs of the generalized flutter derivatives of plate and Sutong Bridge section model are plottedThe characteristics of all generalized flutter derivatives are compared and analyzed, and their superioritiesderivatives graphs with the wind velocity as the horizontal coordinate.

Keywords： bridge     flutter derivative     generalized flutter derivative     self-excited aerodynamic force     Sutong Bridge    

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Condition monitoring of a wind turbine generator using a standalone wind turbine emulator

Himani,Ratna DAHIYA

Frontiers in Energy 2016, Volume 10, Issue 3,   Pages 286-297 doi: 10.1007/s11708-016-0419-5

Abstract: The intend of this paper is to give a description of the realization of a low-cost wind turbine emulatortechnology from graze required for the condition monitoring to diagnose rotor and stator faults in a windemulator reproduces dynamic characteristics both under step variations and arbitrary variation in the windspeed of a typical wind turbine (WT) of a wind energy conversion system (WECS).This wind turbine emulator (WTE) can be reconfigured or analyzed for condition monitoring without the

Keywords： condition monitoring (CM)     wind turbine emulator (WTE)     wind turbine generator (WTG)     maximum power pointtracking (MPPT)     tip speed ratio (TSR)     rotor faults     stator faults    

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controller for control of active and reactive power in DFIG operating in a grid-connected variable speedwind energy conversion system

Azzouz TAMAARAT,Abdelhamid BENAKCHA

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 371-378 doi: 10.1007/s11708-014-0318-6

Abstract: Due to several factors, wind energy becomes an essential type of electricity generation.The objective of this work is to present the modeling and control strategy of a grid connected wind powerThis paper is to present the complete modeling and simulation of a wind turbine driven DFIG in the secondmode of operating (the wind turbine pitch control is deactivated).

Keywords： wind power     doubly fed induction generator (DFIG)     vector control     active power     reactive power     maximum power    

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DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speedwind turbine

Youcef BEKAKRA,Djilani BEN ATTOUS

Frontiers in Energy 2014, Volume 8, Issue 3,   Pages 345-354 doi: 10.1007/s11708-014-0330-x

Abstract: connected to the electric grid through a back-to-back pulse width modulation (PWM) converter for variable speedwind power generation.

Keywords： doubly fed induction generator (DFIG)     wind turbine     back-to-back pulse width modulation (PWM)     DC-link    

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Investigation of wind energy potentials in Brunei Darussalam

M. A. SALAM, M. G. YAZDANI, Q. M. RAHMAN, Dk NURUL, S. F. MEI, Syeed HASAN

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 731-741 doi: 10.1007/s11708-018-0528-4

Abstract: measurement of wind speed at two different locations in Brunei Darussalam.These wind speed distributions were modeled using the Wind Power program.The wind rose graph was obtained for the wind direction to analyze the wind power density onshore andBased on this analysis, it has been found that the wind speed of 3 to 5 m/s has a probability of occurrenceBesides, the annual energy production at a wind speed of 5 m/s has been found to be in the range between

Keywords： wind speed     Weibull distribution     wind rose     wind energy     wind power    

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Techno-economic evaluation of wind energy in southwest Nigeria

Muyiwa S. ADARAMOLA, Olarenwaju M. OYEWOLA, Olayinka S. OHUNAKIN, Rufus R. DINRIFO

Frontiers in Energy 2012, Volume 6, Issue 4,   Pages 366-378 doi: 10.1007/s11708-012-0205-y

Abstract: In this study, an analysis of the wind energy potential in the southwest geo-political region of NigeriaA 37-year (1971–2007) wind speed data set measured at 10 m height, obtained from eight meteorologicalBesides, a techno-economic evaluation of large wind energy conversion systems with power ratings ranging

Keywords： mean wind speed     Weibull distributions     wind turbine     techno-economic analysis     southwest geopolitical region    

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Title Author Date Type Operation

A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Journal Article

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

A novel method for reliability and risk evaluation of wind energy conversion systems considering windspeed correlation

Seyed Mohsen MIRYOUSEFI AVAL,Amir AHADI,Hosein HAYATI

Journal Article

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

Yajvender Pal VERMA, Ashwani KUMAR

Journal Article

Optimal placement of wind turbines within a wind farm considering multi-directional wind speed using

A.S.O. OGUNJUYIGBE, T.R. AYODELE, O.D. BAMGBOJE

Journal Article

Droplet spectra and high-speed wind tunnel evaluation of air induction nozzles

Qing TANG, Liping CHEN, Ruirui ZHANG, Min XU, Gang XU, Tongchuan YI, Bin ZHANG

Journal Article

Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Journal Article

Evaluation of the wind energy potential of two south west sites in Nigeria

Olaleye M. AMOO

Journal Article

Power maximization of variable-speed variable-pitch wind turbines using passive adaptive neural fault

Hamed HABIBI, Hamed RAHIMI NOHOOJI, Ian HOWARD

Journal Article

Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Journal Article

Condition monitoring of a wind turbine generator using a standalone wind turbine emulator

Himani,Ratna DAHIYA

Journal Article

controller for control of active and reactive power in DFIG operating in a grid-connected variable speedwind energy conversion system

Azzouz TAMAARAT,Abdelhamid BENAKCHA

Journal Article

DFIG sliding mode control fed by back-to-back PWM converter with DC-link voltage control for variable speedwind turbine

Youcef BEKAKRA,Djilani BEN ATTOUS

Journal Article

Investigation of wind energy potentials in Brunei Darussalam

M. A. SALAM, M. G. YAZDANI, Q. M. RAHMAN, Dk NURUL, S. F. MEI, Syeed HASAN

Journal Article

Techno-economic evaluation of wind energy in southwest Nigeria

Muyiwa S. ADARAMOLA, Olarenwaju M. OYEWOLA, Olayinka S. OHUNAKIN, Rufus R. DINRIFO

Journal Article