水平轴风力发电机塔架模态影响因素分析

 以某个大型水平轴风力发电塔架为例,采用四因素三水平试验对影响水平轴风力发电机塔架模态的因素进行分析;运用矩阵分析法对塔架进行模态计算,并利用大型有限元软件ABAQUS完成了塔架的数学建模和模态分析,分别考虑了塔架底部门洞、风轮(含轮毂)和机舱的质量、风轮(含轮毂)及机舱的整体偏心、塔架的壁厚及直径对塔架模态的影响。结果表明,风轮(含轮毂)及机舱的整体质量、塔架的壁厚以及直径对塔架的模态影响最为显著,而塔架底部的门洞对塔架模态的影响很小,可以忽略;塔架顶部风轮(含轮毂)及机舱的整体偏心对塔架模态的影响情况由风轮(含轮毂)及机舱的整体偏心程度决定,偏心越大受影响的程度越大。

Modal Analysis on the Impact Factors of Horizontal-axis Wind Turbine Tower

Taking a large tower of horizontal-axis wind turbine as an example, the factors affecting horizontal-axis wind turbine tower are analyzed by the test of four factors and three levels, the modals are calculated using matrix analysis. The finite element model is built and the modal analysis is completed by using the finite element software of ABAQUS. The factors including bottom of the tower openings, the total mass of the cabin and wind wheel (with hubs), the overall eccentric of the cabin and wind wheel (with hubs), and the wall thickness and diameter of the tower are considered in the modal analysis. Through the research of the factors on horizontal-axis wind turbine tower, the results show that the significant factors are the total mass of the cabin and wind wheel (with hubs), and the wall thickness and diameter of the tower, however the factor of the bottom of the tower openings could be ignored; the impact of the overall eccentric of the cabin and wind wheel (with hubs) on horizontal-axis wind turbine tower is determined by the degree of the overall eccentric of the cabin and wind wheel (with hubs), the bigger bias is, the bigger affected degree is.