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Modifying Effect of Wind Speed on the Temperaturehumidity Interaction Impacting Hand,Foot,and Mouth Disease as Assessed by Years Lived with Disability in Western China 认领 引用
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作者 Jie Sun Junyan Xi +9 位作者 Zhishen Wu Wangjian Zhang Jianjun Bai Yining Xiang Yucan Zhang Jiajia Wang Shihao Wang Jing Gu Yuantao Hao Xiao Lin 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2026年第5期529-540,共12页
Objective Hand,foot,and mouth disease(HFMD)transmission is sensitive to temperature-humidity interactions;however,the role of wind speed in modifying these effects remains unknown.This study investigated how wind spee... Objective Hand,foot,and mouth disease(HFMD)transmission is sensitive to temperature-humidity interactions;however,the role of wind speed in modifying these effects remains unknown.This study investigated how wind speed modifies the combined effects of temperature and humidity on HFMD burden and identified subgroups of individuals with increased vulnerability to these climate exposures.Methods We analyzed data from 524,100 HFMD cases and daily meteorological measurements across Guizhou,China,between 2012 and 2019.Disease burden was quantified as the number of years lived with disability.Exposure-response relationships and lag effects were modeled via distributed lag nonlinear models.Additive interactions were assessed based on the proportions attributable to the interaction.The effects of sex,ethnicity,and urbanization were examined using stratified analyses.Results Meteorological factors showed synergistic effects on HFMD burden.The peak burden occurred at moderate mean temperatures(8.7–22.8°C)combined with high relative humidity(>73.7%),showing a 2.4-fold increase versus the reference.High wind speed(>2.5 m/s)further increased this effect,with a 3.1-fold increase in burden.This joint effect was attributable to the additive interaction involving wind speed and remained robust in stratified analyses that identified heightened vulnerability among boys,minority areas,and urban agglomerations.Conclusion The HFMD burden was highest under specific combinations of temperature and humidity,and further increased with concurrent exposure to high wind speeds.Public health strategies for HFMD prevention should incorporate wind speed monitoring into early warning systems and address vulnerable subgroups,including boys and populations in minority areas and urban agglomerations. 展开更多
关键词 Burden of disease Climate Hand,foot,and mouth disease Interaction Wind speed
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Modulation of a ramp-induced shock wave/boundary layer interaction through extended frequency range pulsed discharge 认领 引用
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作者 Hongyu WANG Hongxun LI +1 位作者 Gang WANG Tao LI 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第5期216-234,共19页
Our experimental study explored the impact of pulse discharge energy deposition,across a wider frequencies ranging from 5 kHz to 20 kHz,on a Shock Wave/Boundary Layer Interaction(SWBLI)at a Mach number of 2.47.Using h... Our experimental study explored the impact of pulse discharge energy deposition,across a wider frequencies ranging from 5 kHz to 20 kHz,on a Shock Wave/Boundary Layer Interaction(SWBLI)at a Mach number of 2.47.Using high-speed schlieren imaging,Planar Laser Scattering(PLS)and Focused Laser Differential Interferometry(FLDI),we analyzed the characteristics of discharge-induced energetic eddies and their impact on SWBLI.The Spectral Proper Orthogonal Decomposition(SPOD)was employed to scrutinize the structural transformations of the flow field under the influence of pulse discharge.Our findings indicate that pulsed discharge significantly alters the flow field by propelling the separation shock upstream,with this effect intensifying as the discharge frequency increases.Additionally,the discharge diminishes the fluctuation intensity of the separation shock and the shear layer,and it reduces the low-frequency spectral energy of the separation shock.SPOD analysis revealed that at high discharge frequencies,the flow field dynamics shift from the low-frequency oscillations of the separation shock to the motion of vortices along the boundary layer,which interact with the shock waves.The control efficacy of pulsed discharge on SWBLI demonstrates remarkable consistency and intensity at frequencies of 10 kHz or higher,whereas a notable attenuation in effectiveness is observed at 5 kHz.This reveals a critical frequency threshold beyond which flow characteristics change markedly,primarily seen in the progressive weakening of the separation shock.However,further frequency increases beyond this point yield diminishing returns in SWBLI control effectiveness. 展开更多
关键词 Flow visualization Plasma flow control Shock wave/boundary layer interaction Supersonic flow Wind tunnel experiments
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Experimental and Numerical Study on Local Scour of Pile Group Foundations for Offshore Wind Turbines Under Wave-Current Interactions 认领 引用 被引量：3
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作者 YU Heng ZHANG Yu-hang +1 位作者 JIA Jia-yu ZHANG Jin-feng 《China Ocean Engineering》 SCIE EI CSCD 2025年第3期493-503,共11页
Under the combination of currents and waves, seabed scour occurs around offshore wind turbine foundations, which affects the stability and safe operation of offshore wind turbines. In this study, physical model experi... Under the combination of currents and waves, seabed scour occurs around offshore wind turbine foundations, which affects the stability and safe operation of offshore wind turbines. In this study, physical model experiments under unidirectional flow, bidirectional flow, and wave-current interactions with different flow directions around the pile group foundation were first conducted to investigate the development of scour around the pile group foundation.Additionally, a three-dimensional scour numerical model was established via the open-source software REEF3D to simulate the flow field and scour around the prototype-scale foundation. The impact of flow on scour was discussed.Under unidirectional flow, scour equilibrium was reached more quickly, with the maximum scour depth reaching approximately 1.2 times the pile diameter and the extent of the scour hole spanning about 4.9 times the pile diameter.Compared with those under unidirectional flow, the scour depths under combinations of currents and waves, as well as bidirectional flow, were slightly smaller. However, the morphology of scour holes was more uniform and symmetrical. The numerical simulation results show good agreement with the experimental data, demonstrating the impact of varying flow directions on the velocity distribution around the foundation, the morphology of scour holes, and the location of the maximum scour depth. 展开更多
关键词 offshore wind turbines pile group foundation local scour wave-current interaction numerical simulation
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Experimental study on interaction between membrane structures and wind environment 认领 引用 被引量：9
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作者 Yang Qingshan Wu Yue Zhu Weiliang 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2010年第4期523-532,共10页
The interaction between membrane structures and their environment can be either static or dynamic. Static interaction refers to interaction with static air, while dynamic interaction refers to wind and its effects. Th... The interaction between membrane structures and their environment can be either static or dynamic. Static interaction refers to interaction with static air, while dynamic interaction refers to wind and its effects. They can be evaluated by two parameters, added mass and radiation/aerodynamic damping, which are experimentally investigated in this study. The study includes the effects of both the static and dynamic interaction on structural dynamic characteristics, and the relationship between the interaction parameters and the covered area of a membrane structure for the static interaction and the relationship between the interaction parameters and wind direction and speed for the dynamic interaction. Experimental data show that the dynamic interaction is strongly correlated with the structural modes, i.e., the interaction of the symmetric modes is much larger than the anti-synmletric modes; and the influence of the dynamic interaction is significant in wind-induced response analysis and cannot be ignored. In addition, it is concluded that the structural natural frequency is remarkably decreased by this interaction, and the frequency band is significantly broadened. 展开更多
关键词 membrane structure structure-air/wind interaction added mass aerodynamic damping aero-elastic model
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Dynamic Analysis of Tension Leg Platform for Offshore Wind Turbine Support as Fluid-Structure Interaction 认领 引用 被引量：6
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作者 黄虎 张社荣 《China Ocean Engineering》 SCIE EI 2011年第1期123-131,共9页
Tension leg platform （TLP） for offshore wind turbine support is a new type structure in wind energy utilization. The strong-interaction method is used in analyzing the coupled model, and the dynamic characteristics ... Tension leg platform （TLP） for offshore wind turbine support is a new type structure in wind energy utilization. The strong-interaction method is used in analyzing the coupled model, and the dynamic characteristics of the TLP for offshore wind turbine support are recognized. As shown by the calculated results： for the lower modes, the shapes are water＇s vibration, and the vibration of water induces the structure＇s swing; the mode shapes of the structure are complex, and can largely change among different members; the mode shapes of the platform are related to the tower＇s. The frequencies of the structure do not change much after adjusting the length of the tension cables and the depth of the platform; the TLP has good adaptability for the water depths and the environment loads. The change of the size and parameters of TLP can improve the dynamic characteristics, which can reduce the vibration of the TLP caused by the loads. Through the vibration analysis, the natural vibration frequencies of TLP can be distinguished from the frequencies of condition loads, and thus the resonance vibration can be avoided, therefore the offshore wind turbine can work normally in the complex conditions. 展开更多
关键词 offshore wind turbine tension leg platform fluid structure interaction dynamic characteristics yaw resonance vibration
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Diurnal wind and nonlinear interaction between inertial and tidal currents in the South China Sea during the passage of Typhoon Conson 认领 引用 被引量：5
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作者 LIU Junliang CAI Shuqun WANG Shengan 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2014年第5期1-7,共7页
Diurnal wind （DW） and nonlinear interaction between inertial and tidal currents near the Xisha Islands of the South China Sea （SCS） during the passage of Typhoon Conson （2010） are investigated using observationa... Diurnal wind （DW） and nonlinear interaction between inertial and tidal currents near the Xisha Islands of the South China Sea （SCS） during the passage of Typhoon Conson （2010） are investigated using observational data and a damped slab model. It is found that the DWs, which are dominated by clockwise wind components, are prominent at our observational site. The DWs increase after the passage of the typhoon from 1 to about 4 m/s, which may be due to the decrease of the sea surface temperature caused by the passage of the typhoon. Kinetic energy spectra and bicoherence methods reveal nonlinear interactions between the inertial currents and the 2MK3 tidal constituent at our observational site. The slab damped model reproduces the inertial currents successfully induced by the total observed winds, and it is shown that the inertial currents induced by DWs are positively proportional to the DWs speed. Even though the observed inertial currents are distinct, the proportion of inertial currents induced by DWs to those induced by the total observed winds is just 0.7%/4% before/after the passage of typhoon. This shows that the inertial currents induced by the DWs are unimportant near the Xisha Islands during the typhoon season. 展开更多
关键词 diurnal winds typhoon inertial currents nonlinear interaction slab damped models
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Typhoon-induced wind waves in the northern East China Sea during two typhoon events:the impact of wind field and wave-current interaction 认领 引用 被引量：2
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作者 Zhao LI Shuiqing LI +3 位作者 Yijun HOU Dongxue MO Jian LI Baoshu YIN 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2022年第3期934-949,共16页
We examined the influences of the wind fi eld and wave-current interaction(WCI)on the numerical simulation results of typhoon-induced wind waves in the northern East China Sea(NECS)using the coupled Simulating Waves N... We examined the influences of the wind fi eld and wave-current interaction(WCI)on the numerical simulation results of typhoon-induced wind waves in the northern East China Sea(NECS)using the coupled Simulating Waves Nearshore+Advanced Circulation(SWAN+ADCIRC)model.The simulations were performed during two typhoon events(Lekima and Muifa),and two widely used reanalysis wind fields,the Climate Forecast System Version 2(CFSv2)from the National Centers for Environmental Prediction(NCEP)and the fifth-generation European Centre for Medium-Range Weather Forecasts(ECMWF)Reanalysis(ERA5),were compared.The results indicate that the ERA5 and CFSv2 wind fields both reliably reproduced the wind variations measured by in-situ buoys,and the accuracy of the winds from ERA5 were generally better than those from CFSv2 because CFSv2 tended to overestimate the wind speed and the simulated significant wave height(SWH),particularly the peak SWH.The WCI effects between the two wind field simulations were similar;these effects enhanced the SWH throughout the nearshore NECS during both typhoons but suppressed the SWH on the right side of the Typhoon Muifa track in the deep and off shore sea areas.In summary,variations in the water depth and current propagation direction dominate the modulation of wave height. 展开更多
关键词 wind field typhoon track significant wave height wave-current interaction the northern East China Sea
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A Simplified Method for Estimating the Initial Stiffness of Monopile-Soil Interaction Under Lateral Loads in Offshore Wind Turbine Systems 认领 引用 被引量：2
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作者 LI Xiao-juan DAI Guo-liang +2 位作者 ZHU Ming-xing WANG Li-yan LIU Hong-yuan 《China Ocean Engineering》 SCIE EI CSCD 2023年第1期165-174,共10页
The interface mechanical behavior of a monopile is an important component of the overall offshore wind turbine structure design.Understanding the soil-structure interaction,particularly the initial soil-structure stif... The interface mechanical behavior of a monopile is an important component of the overall offshore wind turbine structure design.Understanding the soil-structure interaction,particularly the initial soil-structure stiffness,has a significant impact on the study of natural frequency and dynamic response of the monopile.In this paper,a simplified method for estimating the interface mechanical behavior of monopiles under initial lateral loads is proposed.Depending on the principle of minimum potential energy and virtual work theory,the functions of soil reaction components at the interface of monopiles are derived;MATLAB programming has been used to simplify the functions of the initial stiffness by fitting a large number of examples;then the functions are validated against the field test data and FDM results.This method can modify the modulus of the subgrade reaction in the p-y curve method for the monopile-supported offshore wind turbine system. 展开更多
关键词 theoretical analysis pile−soil interaction interface mechanical behavior offshore wind turbine systems
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Analysis of the Influence of the Blade Deformation on Wind Turbine Output Power in the Framework of a Bidirectional Fluid-Structure Interaction Model 认领 引用 被引量：1
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作者 Ling Yuan Zhenggang Liu +1 位作者 Li Li Ming Lin 《Fluid Dynamics & Materials Processing》 EI 2023年第5期1129-1141,共13页
The blades of large-scale wind turbines can obviously deform during operation,and such a deformation can affect the wind turbine’s output power to a certain extent.In order to shed some light on this phenomenon,for w... The blades of large-scale wind turbines can obviously deform during operation,and such a deformation can affect the wind turbine’s output power to a certain extent.In order to shed some light on this phenomenon,for which limited information is available in the literature,a bidirectional fluid-structure interaction(FSI)numerical model is employed in this work.In particular,a 5 MW large-scale wind turbine designed by the National Renewable Energy Laboratory(NREL)of the United States is considered as a testbed.The research results show that blades’deformation can increase the wind turbine’s output power by 135 kW at rated working conditions.Compared with the outcomes of the simulations conducted using the model with no blade deformation,the results obtained with the FSI model are closer to the experimental data.It is concluded that the bidirectional FSI model can replicate the working conditions of wind turbines with great fidelity,thereby providing an effective method for wind turbine design and optimization. 展开更多
关键词 Wind turbine fluid-structure interaction numerical simulation blade
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Dynamic Analysis of A 5-MW Tripod Offshore Wind Turbine by Considering Fluid–Structure Interaction 认领 引用 被引量：4
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作者 ZHANG Li-wei LI Xin 《China Ocean Engineering》 SCIE EI CSCD 2017年第5期559-566,共8页
Fixed offshore wind turbines usually have large underwater supporting structures. The fluid influences the dynamic characteristics of the structure system. The dynamic model of a 5-MW tripod offshore wind turbine cons... Fixed offshore wind turbines usually have large underwater supporting structures. The fluid influences the dynamic characteristics of the structure system. The dynamic model of a 5-MW tripod offshore wind turbine considering the pile-soil system and fluid structure interaction （FSI） is established, and the structural modes in air and in water are obtained by use of ANSYS. By comparing low-order natural frequencies and mode shapes, the influence of sea water on the free vibration characteristics of offshore wind turbine is analyzed. On basis of the above work, seismic responses under excitation by E1-Centro waves are calculated by the time-history analysis method. The results reveal that the dynamic responses such as the lateral displacement of the foundation and the section bending moment of the tubular piles increase substantially under the influence of the added-mass and hydrodynamic pressure of sea water. The method and conclusions presented in this paper can provide a theoretical reference for structure design and analysis of offshore wind turbines fixed in deep seawater. 展开更多
关键词 5-MW tripod offshore wind turbine fluid-structure interaction natural frequency seismic analysis,hydrodynamic pressure
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Overview of Coordinated Control Strategies of Wind Farm Integrated MMC-HVDC 认领 引用
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作者 Jingyi Zhang Huiru Yang +6 位作者 Zhen Tian Meng Huang Pan Feng Fei Liu Zhe Chen Ruanming Huang Xiaoming Zha 《CES Transactions on Electrical Machines and Systems》 EI CSCD 2026年第2期240-256,共17页
With the development of onshore power grid projects in desert,Gobi and desertified regions as well as offshore wind power projects,electric energy requires longdistance transmission due to insufficient local consumpti... With the development of onshore power grid projects in desert,Gobi and desertified regions as well as offshore wind power projects,electric energy requires longdistance transmission due to insufficient local consumption.Modular multilevel converter based high-voltage direct current(MMC-HVDC)has become the mainstream transmission technology for large-scale remote wind farm integration.However,MMC-HVDC electrically decouples wind farms from the main grid,and its interaction with wind farms can trigger various oscillations.In addition,the MMC-HVDC connected wind farm system differs from single-converter grid-connected systems in structure,equipment complexity,and fault evolution,leading to problems such as low inertia,wideband oscillations and poor fault ride-through.To address these issues,coordinated control strategies considering dynamic interactions between wind farms and MMC-HVDC have been widely studied.This paper thus reviews such coordinated control strategies from three aspects:first,introducing common engineering symmetrical monopole/bipolar MMC-HVDC system structures;second,summarizing grid frequency sensing methods and inertia support control strategies for MMC-HVDC and wind farms;third,discussing coordinated oscillation suppression and fault ride-through control strategies,considering direct current(DC)-side faults,alternating current(AC)-side grid faults,and wind farm area faults.Finally,it summarizes deficiencies of existing studies for each challenge and prospects future research directions for MMC-HVDC connected wind farm systems. 展开更多
关键词 Wind farm Modular multilevel converter based high-voltage direct current(MMC-HVDC) Coordinated control Dynamic interactions
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THE ROLE OF MERIDIONAL WIND STRESS IN THE TROPICAL UNSTABLE AIR-SEA INTERACTION 认领 引用 被引量：1
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作者 房佳蓓 杨修群 《Journal of Tropical Meteorology》 2003年第1期95-104,共10页
With a simple tropical coupled ocean-atmosphere model, this paper presents an analysis aiming to understand the relative role of the meridional and zonal wind stresses in the tropical unstable air-sea interaction. The... With a simple tropical coupled ocean-atmosphere model, this paper presents an analysis aiming to understand the relative role of the meridional and zonal wind stresses in the tropical unstable air-sea interaction. The roles of the zonal wind stress, the meridional wind stress and the both are considered respectively into the coupled system. It is demonstrated that the meridional component of the wind stress does not lead to any instability under the local thermal balance assumption, but it does lead to a weak instability under the sea surface temperature advection assumption. Unstable air-sea interaction is dominated by the zonal component of the wind stress, suggesting that ignoring the meridional wind stress is approximately feasible in studying the tropical unstable air-sea interaction. 展开更多
关键词 wind stress air-sea interactions instability
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CISK Kelvin Wave with Evaporation-Wind Feedbackand Air-Sea Interaction-A Further Study ofTropical Intraseasonal Oscillation Mechanism 认领 引用 被引量：8
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作者 李崇银 禚汉如 王作台 《Advances in Atmospheric Sciences》 SCIE CAS 2002年第3期379-390,共12页
The wave-CISK (cumulus convection heating feedback), the air-sea interaction and the evaporation-wind feedback are together introduced into a simple theoretical model, in order to understand their effect on driving tr... The wave-CISK (cumulus convection heating feedback), the air-sea interaction and the evaporation-wind feedback are together introduced into a simple theoretical model, in order to understand their effect on driving tropical atmospheric intraseasonal oscillation (ISO). The results showed that among the introduced dynamical processes the wave-CISK plays a major role in reducing phase speed of the wave to be closer to the observed tropical ISO. While the evaporation-wind feedback plays a major role in unstabilizing the wave. The air-sea interaction has certain effect on slowing down the phase speed of the wave. Therefore, the wave-CISK and evaporation-wind feedback can be regarded as fundamental dynamical mechanism of the tropical ISO. This study also shows that since the effects of the evaporation-wind feedback and the air-sea interaction were introduced, the excited wave is zonally dispersive, which can dynamically explain the activity feature of the observed ISO in the tropical atmosphere very well. 展开更多
关键词 Intraseasonal oscillation CISK Kelvin wave Evaporation-wind feedback Air-sea interaction
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Multi-Objective Optimal Design of the Wind-Wave Hybrid Platform with the Coupling Interaction 认领 引用
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作者 DENG Ziwei ZHANG Baocheng +3 位作者 MIAO Yu ZHAO Bo WANG Qiang ZHANG Kaisheng 《Journal of Ocean University of China》 SCIE CAS CSCD 2023年第5期1165-1180,共16页
An offshore wind-wave hybrid platform could consistently and cost-effectively supply renewable power.A multi-objective optimization process is proposed for a hybrid platform with hydrodynamic coupling interaction.The ... An offshore wind-wave hybrid platform could consistently and cost-effectively supply renewable power.A multi-objective optimization process is proposed for a hybrid platform with hydrodynamic coupling interaction.The effects of various critical structural parameters,spacing values,and wave directions are studied for higher energy capture and offshore platform stability.Approximation models of various key parameters are established to optimize the hybrid system,with the objects of the power capture width ratio and the stability index of the platform.The optimization results are affected by the hydrodynamic coupling interaction,with a tendency to affect the higher frequency of hydrodynamic performance in the hybrid system.After the optimization,an appropriate spacing value effectively improves energy capture performance.The optimal array distance DFf,DFp,the optimal structural parameters Rp,rp,df,rf,and BPTOare 11.57,12.75,5.1,3.3,1.5,6.5 m,and 80436 Nm s-1,respectively.The peak value of the wave energy converter capture width ratio in the hybrid system increases by almost 50%,with a 54%decrease in the stability index. 展开更多
关键词 wind and wave energy hydrodynamic interaction optimization
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Effects of a dipole-like crustal field on solar wind interaction with Mars 认领 引用 被引量：7
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作者 ShiBang Li HaoYu Lu +4 位作者 Jun Cui YiQun Yu Christian Mazelle Yun Li JinBin Cao 《Earth and Planetary Physics》 EI CAS CSCD 2020年第1期23-31,共9页
A three-dimensional four species multi-fluid magnetohydrodynamic (MHD) model was constructed to simulate the solar wind global interaction with Mars. The model was augmented to consider production and loss of the sign... A three-dimensional four species multi-fluid magnetohydrodynamic (MHD) model was constructed to simulate the solar wind global interaction with Mars. The model was augmented to consider production and loss of the significant ion species in the Martian ionosphere, i.e., H^+, O2^+, O^+, CO^+2, associated with chemical reactions among all species. An ideal dipole-like local crustal field model was used to simplify the empirically measured Martian crustal field. Results of this simulation suggest that the magnetic pile-up region (MPR) and the velocity profile in the meridian plane are asymmetric, which is due to the nature of the multi-fluid model to decouple individual ion velocity resulting in occurrence of plume flow in the northern Martian magnetotail. In the presence of dipole magnetic field model, boundary layers, such as bow shock (BS) and magnetic pile-up boundary (MPB), become protuberant. Moreover, the crustal field has an inhibiting effect on the flux of ions escaping from Mars, an effect that occurs primarily in the region between the terminator (SZA 90°) and the Sun Mars line of the magnetotail (SZA 180°), partially around the terminator region. In contrast, near the tailward central line the crustal field has no significant impact on the escaping flux. 展开更多
关键词 solar wind interaction with Mars global MHD simulation crustal field escape flux
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Multiple Tuned Mass Damper Based Vibration Mitigation of Offshore Wind Turbine Considering Soil–Structure Interaction 认领 引用 被引量：10
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作者 Mosaruf HUSSAN Faria SHARMIN Dookie KIM 《China Ocean Engineering》 SCIE EI CSCD 2017年第4期476-486,共11页
The dynamics of jacket supported offshore wind turbine （OWT） in earthquake environment is one of the progressing focuses in the renewable energy field. Soil-structure interaction （SSI） is a fundamental principle t... The dynamics of jacket supported offshore wind turbine （OWT） in earthquake environment is one of the progressing focuses in the renewable energy field. Soil-structure interaction （SSI） is a fundamental principle to analyze stability and safety of the structure. This study focuses on the performance of the multiple tuned mass damper （MTMD） in minimizing the dynamic responses of the structures objected to seismic loads combined with static wind and wave loads. Response surface methodology （RSM） has been applied to design the MTMD parameters. The analyses have been performed under two different boundary conditions： fixed base （without SSI） and flexible base （with SSI）. Two vibration modes of the structure have been suppressed by multi-mode vibration control principle in both cases. The effectiveness of the MTMD in reducing the dynamic response of the structure is presented. The dynamic SSI plays an important role in the seismic behavior of the jacket supported OWT, especially resting on the soft soil deposit. Finally, it shows that excluding the SSI effect could be the reason of overestimating the MTMD performance. 展开更多
关键词 soil-structure interaction multiple tuned mass damper vibration control response surface method jacket supported offshore wind turbine
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The wind-saltation interaction in a saltation boundary layer with a downwind air pressure gradient 认领 引用
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作者 ZhiBao Dong QingSong Mu +1 位作者 GuangQiang Qian WanYin Luo 《Research in Cold and Arid Regions》 2010年第5期384-395,共12页
Studies of interactions between wind and saltating particles （i.e., the wind-saltation interaction） are usually conducted without consideration of the downwind air pressure gradient. However, in a wind tunnel with l... Studies of interactions between wind and saltating particles （i.e., the wind-saltation interaction） are usually conducted without consideration of the downwind air pressure gradient. However, in a wind tunnel with limited size, this gradient is required to maintain the movement of the saltation cloud. Attempts are made to investigate the effects of the downwind air pressure gradient on the wind-saltation interaction in a saltation boundary layer based on the experimental results from a wind tunnel with a relatively small cross-sectional area. The wind-saltation interaction is characterized by airborne stress, grain-borne stress, and the force exerted on the wind by the saltation cloud. Basic equations were developed for wind-saltation interactions without and with a downwind air pressure gradient. The results reveal that unacceptable values of negative grain-borne stress and negative force exerted on the wind by the saltation cloud are obtained if the downwind air pressure gradient is ignored. When this air pressure gradient is defined using the measured wind velocity profiles in the presence of saltation and the downwind air pressure gradient is taken into account, reasonable values for grain-borne stress and the force exerted on the wind by the saltation cloud are obtained. These results suggest that attention must be paid to the effects of downwind air pressure gradients when studying the wind-saltation interaction in a wind tunnel. Consideration of the downwind air pressure gradient, inertial forces, and other unidentified variables will provide a more thorough understanding of the interactions within a saltation boundary layer. 展开更多
关键词 aeolian transport wind-saltation interaction shear stress force
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A numerical study on the weakening trend of subtropical–tropical North Pacific trade winds post-2010 认领 引用
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作者 Jinhui Wen Shouwen Zhang +2 位作者 Lin Wang Hui Wang Dongxiao Wang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第3期36-48,共13页
Trade winds,a fundamental component of tropical atmospheric circulation,exert a crucial influence on the global climate by modulating ocean–atmosphere interactions.In this study,we investigate the weakening trend of ... Trade winds,a fundamental component of tropical atmospheric circulation,exert a crucial influence on the global climate by modulating ocean–atmosphere interactions.In this study,we investigate the weakening trend of the subtropical–tropical North Pacific trade winds after 2010 using both reanalysis datasets and an atmospheric general circulation model(CAM4).The model reasonably captures the observed weakening of the trade winds.Sensitivity experiments reveal that sea surface temperature(SST)variability in the Pacific plays a predominant role in driving the post-2010 weakening of the subtropical–tropical North Pacific trade winds(5°–25°N,170°–120°W).Specifically,results from the experiment forced by Pacific SST suggest that the northward expansion of the tropical western Pacific warm pool enhances deep convection,which triggers an upper-tropospheric wave train.This wave train is associated with a negative sea level pressure trend over the mid-latitude Pacific,which in turn induces anomalous southwesterly winds and suppresses the climatological northeasterly trade winds over the subtropical–tropical North Pacific. 展开更多
关键词 North Pacific trade winds Pacific warm pool air-sea interactions atmospheric general circulation model
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Dynamic Behavior of Offshore Wind Turbines Considering Monopile Flexibility under Combined Wind,Wave and Soil 认领 引用
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作者 Shengya Liu Wei Bian +2 位作者 Linan Li Yang Xue Jingxun Yin 《Energy Engineering》 EI 2026年第9期25-45,共21页
Offshore wind energy plays a critical role in achieving global decarbonization goals,while the dynamic response mechanisms of megawatt-scale turbines under complex environmental conditions remain insufficiently charac... Offshore wind energy plays a critical role in achieving global decarbonization goals,while the dynamic response mechanisms of megawatt-scale turbines under complex environmental conditions remain insufficiently characterized.Current research often oversimplifies the effects of monopile flexibility and its interaction with soil dynamics,leading to gaps in dynamic predictions.To address this limitation,this study develops a comprehensive 15-degree-of-freedom dynamic model for a 22 MW monopile offshore wind turbine(OWT)that incorporates nonlinear pile flexibility and soil-structure interaction through p-y and Q-z curves.The integrated analytical framework,established using Euler-Lagrange equations,enables coupled analysis of aero-hydro-soil-structure interactions through systematic energy formulations.The simulation incorporates wind loads calculated via Blade Element Momentum theory and wave loads computed using Morison's equation based on linear Airy wave theory.The dynamic responses of the OWT system,including displacements and natural frequencies,are then systematically evaluated under combined wind,wave and soil loadings.Comparative analysis of dynamic responses under rigid,semi-rigid and flexible pile configurations reveals distinct behavioral mechanisms,highlighting the crucial role of pile flexibility in soil-structure interaction.The proposed methodology establishes a scalable framework for integrating soil models and control strategies in future research.These findings offer valuable insights for optimizing foundation designs through site-specific stiffness and damping considerations in megawatt-scale OWT engineering applications. 展开更多
关键词 Offshore wind turbine soil-structure interactions dynamic behavior pile flexibility
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Study of parachute inflation process using fluid–structure interaction method 认领 引用 被引量：24
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作者 Yu Li Cheng Han +1 位作者 Zhan Ya'nan Li Shaoteng 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第2期272-279,共8页
A direct numerical modeling method for parachute is proposed firstly, and a model for the star-shaped folded parachute with detailed structures is established. The simplified arbitrary Lagrangian-Eulerian fluid struct... A direct numerical modeling method for parachute is proposed firstly, and a model for the star-shaped folded parachute with detailed structures is established. The simplified arbitrary Lagrangian-Eulerian fluid structure interaction （SALE/FSI） method is used to simulate the infla- tion process of a folded parachute, and the flow field calculation is mainly based on operator split- ting technique. By using this method, the dynamic variations of related parameters such as flow field and structure are obtained, and the load jump appearing at the end of initial inflation stage is cap- tured. Numerical results including opening load, drag characteristics, swinging angle, etc. are well consistent with wind tunnel tests. In addition, this coupled method can get more space-time detailed information such as geometry shape, structure, motion, and flow field. Compared with previous inflation time method, this method is a completely theoretical analysis approach without relying on empirical coefficients, which can provide a reference for material selection, performance optimi- zation during parachute design. 展开更多
关键词 Empirical formula Fluid-structure interaction Inflation process Opening shockiParachute Wind tunnel test
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