基于材料非线性海上风力发电机塔架屈曲分析

Buckling Analysis of Wind Turbine Tower Based on Material Nonlinearity

塔架结构是海上风力发电机组的支撑结构,其设计水平直接影响设备的安全性和经济性。风力发电机组塔架高度多在90 m~110 m,作为典型的细长薄壳圆柱结构,屈曲稳定性为塔架设计的主要限制条件。通过有限元数值模拟LBA/MNA分析方法,对海上风力发电机组塔架设备临界屈曲载荷进行计算和分析。通过与EN1993-1-6中基于薄膜应力理论的传统工程算法对比表明:由于塔架的材料非线性特性存在,基于有限元的数值模拟屈曲分析方法结果比传统的工程算法更接近于实际情况,且经济性较优,可为塔架结构的屈曲优化提供方向。

The tower is main supporting structure of wind turbine.The safety and economy of wind turbine is affected by design level directly.The tower height of wind turbine is usually between 90 m and 110 m,so the buckling stability becomes the main limiting condition for tower design.The critical buckling load of wind turbine tower is calculated and analyzed by LBA/MNA analysis method.Compared with traditional engineering algorithm in EN1993-1-6,because of the nonlinear characteristics of the tower materials,the results of the numerical simulation buckling analysis method which is based on the finite element method are closer to the actual situation than the traditional engineering algorithm.LBA/MNA analysis method can obtain better economy and provide direction for buckling optimization of tower structures.