鉴于在两个频率接近的临近附属结构之间设置连接粘滞阻尼器(Viscous Damper,VD)的减震效果往往很差,该文采用了一种新型的减震方法:共享调谐质量阻尼器(Shared Tuned Mass Damper,STMD)的方法。该方法在临近的附属结构之间附加公共质量...鉴于在两个频率接近的临近附属结构之间设置连接粘滞阻尼器(Viscous Damper,VD)的减震效果往往很差,该文采用了一种新型的减震方法:共享调谐质量阻尼器(Shared Tuned Mass Damper,STMD)的方法。该方法在临近的附属结构之间附加公共质量块,并以粘滞阻尼器连接,利用附属结构与质量块之间的相对运动来耗能减震;同时实现了两个附属结构的协调振动,避免地震作用下附属结构碰撞的发生,并且当附属结构频率接近时共享调谐质量阻尼器(STMD)有很好的减震效果。该文研究了在临近附属结构之间分别采用粘滞阻尼器(VD)和共享调谐质量阻尼器(STMD)时的减震效果,并对共享调谐质量阻尼器(STMD)减震效果的适用情况和影响因素进行了分析。展开更多
For the offshore wind turbines installed in earthquake areas,their operation is affected by seismic loads in addition to wind and wave loads.Therefore,it is necessary to study the dynamic responses and vibration contr...For the offshore wind turbines installed in earthquake areas,their operation is affected by seismic loads in addition to wind and wave loads.Therefore,it is necessary to study the dynamic responses and vibration control of the wind turbines.In previous studies,the structural responses of offshore wind turbines are usually investigated in the parked case,while the blade rotation effect is usually not considered.The evaluation on the structural responses may be inaccurate under this condition,further affecting the evaluation on the vibration control performance of a control system.In view of it,this paper established a complete multi-body model of a fixed-bottom offshore wind turbine considering pile-soil interaction,and then performed simulations when the wind turbine was subjected to multiple external excitations.Continued,a single tuned mass damper(STMD)system and a multiple tuned mass dampers(MTMDs)system were applied to control structural vibrations of the wind turbine.Then,based on the construction of a simplified main structure-TMD system,TMD parameters were optimized.Finally,twelve load cases including operating and parked conditions were selected to perform simulations.Results show that the influence of the seismic excitation on blade responses is greater under the parked condition than that under the operating condition.Moreover,STMD/MTMDS exhibit better performance under the parked condition than that under the operating condition.Compared with STMD,MTMDS can better suppress the vibrations at both the fundamental and high-order modes,and exhibits significant robustness under the condition of changing soil parameters.展开更多
文摘鉴于在两个频率接近的临近附属结构之间设置连接粘滞阻尼器(Viscous Damper,VD)的减震效果往往很差,该文采用了一种新型的减震方法:共享调谐质量阻尼器(Shared Tuned Mass Damper,STMD)的方法。该方法在临近的附属结构之间附加公共质量块,并以粘滞阻尼器连接,利用附属结构与质量块之间的相对运动来耗能减震;同时实现了两个附属结构的协调振动,避免地震作用下附属结构碰撞的发生,并且当附属结构频率接近时共享调谐质量阻尼器(STMD)有很好的减震效果。该文研究了在临近附属结构之间分别采用粘滞阻尼器(VD)和共享调谐质量阻尼器(STMD)时的减震效果,并对共享调谐质量阻尼器(STMD)减震效果的适用情况和影响因素进行了分析。
基金sponsored by the Scientific Research Foundation of Chongqing University of Technology (Grant No. 2020ZDZ023)the Project of Science and Technology Research Program of Chongqing Education Commission of China (Grant No. KJQN202101133)+2 种基金the National Natural Science Foundation Cultivation Program of Chongqing University of Technology (Grant No.2021PYZ14)Shanghai Engineering Research Center of Marine Renewable Energy (Grant No. 19DZ2254800)the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN201805801)
文摘For the offshore wind turbines installed in earthquake areas,their operation is affected by seismic loads in addition to wind and wave loads.Therefore,it is necessary to study the dynamic responses and vibration control of the wind turbines.In previous studies,the structural responses of offshore wind turbines are usually investigated in the parked case,while the blade rotation effect is usually not considered.The evaluation on the structural responses may be inaccurate under this condition,further affecting the evaluation on the vibration control performance of a control system.In view of it,this paper established a complete multi-body model of a fixed-bottom offshore wind turbine considering pile-soil interaction,and then performed simulations when the wind turbine was subjected to multiple external excitations.Continued,a single tuned mass damper(STMD)system and a multiple tuned mass dampers(MTMDs)system were applied to control structural vibrations of the wind turbine.Then,based on the construction of a simplified main structure-TMD system,TMD parameters were optimized.Finally,twelve load cases including operating and parked conditions were selected to perform simulations.Results show that the influence of the seismic excitation on blade responses is greater under the parked condition than that under the operating condition.Moreover,STMD/MTMDS exhibit better performance under the parked condition than that under the operating condition.Compared with STMD,MTMDS can better suppress the vibrations at both the fundamental and high-order modes,and exhibits significant robustness under the condition of changing soil parameters.
