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分段式结构对风力机塔架振动特性的影响分析
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作者 程友良 薛占璞 +1 位作者 渠江曼 蒋衍 《噪声与振动控制》 CSCD 2017年第3期37-41,共5页
针对分段式结构引起的风力发电塔架失稳问题,利用刚体有限元法建立分段式结构三维动力学模型,提取模态分析的前五阶非零模态的振型,研究在湍流工况下分段式塔架连接处内外法兰的振型特性,通过内外法兰的振型与频谱响应对比,分析分段结... 针对分段式结构引起的风力发电塔架失稳问题,利用刚体有限元法建立分段式结构三维动力学模型,提取模态分析的前五阶非零模态的振型,研究在湍流工况下分段式塔架连接处内外法兰的振型特性,通过内外法兰的振型与频谱响应对比,分析分段结构对塔架振动特性的影响。结果表明:分段式的外法兰比内法兰各阶振动位移量小,振动变化幅度小,不易发生共振,外法兰的第1阶振型起主导作用,非线性的扭转变形小,该结果可为塔架在运行过程中避免发生共振及失稳现象提供一定的参考。 展开更多
关键词 振动与波 塔架 分段式结构 频谱 扭转变形
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Dynamic Analysis of Wind Power Turbine's Tower under the Combined Action of Winds and Waves
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作者 CHENG You-liang qu jiang-man +1 位作者 XUE Zhan-pu JIANG Yan 《International Journal of Plant Engineering and Management》 2017年第3期140-149,共10页
To deal with the dynamic response problem of offshore wind power tower under the combined action of winds and waves, finite element method is used to analyze the structure and flow field around the outside flange of t... To deal with the dynamic response problem of offshore wind power tower under the combined action of winds and waves, finite element method is used to analyze the structure and flow field around the outside flange of the segmentation part. The changes of pressure distribution and vorticity about the outside flange are obtained Focused on the analysis on the change of hydrostatic pressure and temperature of the tower cut surface, contour lines under the combined action of winds and waves are depicted. Results show that the surface of the offshore wind turbine tower presents instable temperature field when it suffers the action of winds and waves loads, the static pressure increases nonlinear!y with the increase of altitude, the fluid vorticity around the outside flange follows an parabolic curve approximately. Results provide a reference for the actual monitoring data of the offshore wind turbine tower under the combined action of winds and waves, so as to ensure the normal operation of tower. 展开更多
关键词 TOWER segmentation part dynamic response outside flange STEADY
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