拉索式小型风力发电机塔架结构的固有频率分析  

Analysis of the natural frequency of a small size wind turbine tower structure supported by guy cables

作　　者：张永强 崔承勋[1] Zhang Yongqiang;Cui Chengxun(College of Engineering,Yanbian University,Yanji 133000,China)

机构地区：[1]延边大学工学院,吉林延吉133000

出　　处：《可再生能源》2018年第10期1529-1534,共6页Renewable Energy Resources

基　　金：延边大学横向科研项目(413090023)

摘　　要：文章基于Galerkin法,提出了一种可以计算拉索式小型风力发电机塔架结构固有频率的理论模型。为了验证理论模型的有效性,对理论模型进行了模态测试、有限元分析及理论分析。结果表明,理论分析得到的固有频率十分接近模态测试及有限元分析结果。理论模型的参数研究显示,结构的固有频率随钢索预紧力的增大而增大,但预紧力达到某一定值之后固有频率不再增加而趋于极限值。该结果要求制造商在安装说明中指明合理的预紧力值。A theoretical model based on Galerkin method is proposed to predict the resonance frequency of a W/T（WindTurbine） tower structure supported by guy cables. In order to verify the validity of the theoretical model, a reduced W/T tower structure model is manufactured and tested.Frequency and mode data are determined by modal testing,and finite element analysis is performed to calculate the natural frequency of the test model. Numerical and experimental results are compared with those by the theoretical analysis. Parametric study by the theoretical model shows how the cable tension influence the resonance frequency of the W/T tower structure. When the tensional force increases the frequency of the W/T tower structure increase, but the situation that the frequency does not increase above a certain tension limit value indicates a reasonable tension limit. This result that the frequency depends on the tension provides a guide line for installing wind turbine tower to tell the value of the tensional force.

关 键 词：固有频率 振动模态 GALERKIN法 有限元分析 模态测试 

分 类 号：TH113.1[机械工程—机械设计及理论]