In recent years,the exploitation of offshore wind resources has been attached with greater importance.As a result,semi-submersible floating wind turbines(FWTs)have gradually become a popular research topic,with the st...In recent years,the exploitation of offshore wind resources has been attached with greater importance.As a result,semi-submersible floating wind turbines(FWTs)have gradually become a popular research topic,with the structural strength being a research hotspot as it can ensure the safe operation of FWTs.The severe sea conditions of freak waves result in enormous wave heights,extremely fast wave speeds,and concentrated energy.Thus,it is difficult to accurately simulate these effects on the loads of floating wind turbines using the potential flow theory and other theories.In this paper,the structural strength of a floating wind turbine under the action of freak waves is analyzed based on the CFD-FEA coupled method.The effects of the mooring system and the wind load are considered in the time domain,and the CFD method is applied to analyze the wave load of the floating wind turbine under the extreme sea state of freak waves.The strength and motion of the floating wind turbine float structure are analyzed by combining the CFD method and the FEA method,and the analytical results of the mutual transfer of these two methods are taken as the initial quantities for further analysis.The accuracy of the analytical model of the CFD-FEA method is verified by the results of the tank test analysis,and the structural strength analysis under freak wave conditions is carried out for a new type of floating wind turbine.The results of this research provide useful guidance and references for the design and engineering applications of offshore floating wind turbines.展开更多
在现有关于融通仓相关问题的研究中,物流企业皆被界定为第三方物流(Third Party Logitics,3PL),而研究第四方物流(Fourth Party Logistics,4PL)参与融通仓业务的文献还没有,本文把第四方物流引入融通仓业务中,运用委托代理理论,考虑了...在现有关于融通仓相关问题的研究中,物流企业皆被界定为第三方物流(Third Party Logitics,3PL),而研究第四方物流(Fourth Party Logistics,4PL)参与融通仓业务的文献还没有,本文把第四方物流引入融通仓业务中,运用委托代理理论,考虑了第三方物流完成的质押物价值评估、质押物运输、质押物监管、质押物处置及信息共享五个指标,建立第四方物流和多个第三方物流一对多的多任务委托代理模型,并从第四方物流在业务过程中对第三方物流完成任务有无付出努力两个方面展开。结果显示,第四方物流付出努力时,第三方物流努力增加,且第四方物流付出的努力越多,第三方物流越努力工作;第四方物流会给予能力强,从事对收益贡献较大业务的第三方物流更多的激励。展开更多
Floating wind turbines(FWTs) are subjected to combined aerodynamic and hydrodynamic loads varying both in time and amplitude. In this study, a multi-column tension-leg-type FWT(i.e., Wind Star TLP system) is investiga...Floating wind turbines(FWTs) are subjected to combined aerodynamic and hydrodynamic loads varying both in time and amplitude. In this study, a multi-column tension-leg-type FWT(i.e., Wind Star TLP system) is investigated for its global performance under normal operating conditions and when parked. The selected variables are analysed using a fully coupled aero-hydro-servo-elastic time domain simulation tool FAST.Three different loading scenarios(wind only, wave only and both combined) are examined to identify the dominant load influencing each response. The key response variables are obtained and compared with those for an NREL5 MW baseline wind turbine installed on land. The results should aid the detailed design of the Wind Star TLP system.展开更多
基金financially supported by the National Natural Science Foundation of China(Grant Nos.52071161 and 52301322)the Jiangsu Provincial Natural Science Foundation(Grant No.BK20220653).
文摘In recent years,the exploitation of offshore wind resources has been attached with greater importance.As a result,semi-submersible floating wind turbines(FWTs)have gradually become a popular research topic,with the structural strength being a research hotspot as it can ensure the safe operation of FWTs.The severe sea conditions of freak waves result in enormous wave heights,extremely fast wave speeds,and concentrated energy.Thus,it is difficult to accurately simulate these effects on the loads of floating wind turbines using the potential flow theory and other theories.In this paper,the structural strength of a floating wind turbine under the action of freak waves is analyzed based on the CFD-FEA coupled method.The effects of the mooring system and the wind load are considered in the time domain,and the CFD method is applied to analyze the wave load of the floating wind turbine under the extreme sea state of freak waves.The strength and motion of the floating wind turbine float structure are analyzed by combining the CFD method and the FEA method,and the analytical results of the mutual transfer of these two methods are taken as the initial quantities for further analysis.The accuracy of the analytical model of the CFD-FEA method is verified by the results of the tank test analysis,and the structural strength analysis under freak wave conditions is carried out for a new type of floating wind turbine.The results of this research provide useful guidance and references for the design and engineering applications of offshore floating wind turbines.
文摘在现有关于融通仓相关问题的研究中,物流企业皆被界定为第三方物流(Third Party Logitics,3PL),而研究第四方物流(Fourth Party Logistics,4PL)参与融通仓业务的文献还没有,本文把第四方物流引入融通仓业务中,运用委托代理理论,考虑了第三方物流完成的质押物价值评估、质押物运输、质押物监管、质押物处置及信息共享五个指标,建立第四方物流和多个第三方物流一对多的多任务委托代理模型,并从第四方物流在业务过程中对第三方物流完成任务有无付出努力两个方面展开。结果显示,第四方物流付出努力时,第三方物流努力增加,且第四方物流付出的努力越多,第三方物流越努力工作;第四方物流会给予能力强,从事对收益贡献较大业务的第三方物流更多的激励。
基金the National Basic Research Program(973)of China(No.2014CB046205)
文摘Floating wind turbines(FWTs) are subjected to combined aerodynamic and hydrodynamic loads varying both in time and amplitude. In this study, a multi-column tension-leg-type FWT(i.e., Wind Star TLP system) is investigated for its global performance under normal operating conditions and when parked. The selected variables are analysed using a fully coupled aero-hydro-servo-elastic time domain simulation tool FAST.Three different loading scenarios(wind only, wave only and both combined) are examined to identify the dominant load influencing each response. The key response variables are obtained and compared with those for an NREL5 MW baseline wind turbine installed on land. The results should aid the detailed design of the Wind Star TLP system.
