风电叶片低阶频率识别的近似解法及试验

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (18) : 78-82.

论文

风电叶片低阶频率识别的近似解法及试验

黄雪梅 , 张磊安

作者信息 +

The low-frequency identification approximate algorithm and test for wind turbine blade

Huang Xue-mei , Zhang Lei-an

Author information +

文章历史 +

摘要

风电叶片截面具有不规则特征，采用传统的Bernoulli-Euler Beam模型求解其低阶固有频率非常困难。提出一种风电叶片低阶固有频率识别的新方法—矩阵传递算法。沿叶片展向将其离散为若干个二节点梁，对每个二节点梁段求出段矩阵，将总传递矩阵等效为若干个段矩阵之积。通过引入边界条件，编制程序对aeroblade3.6-56.4风电叶片的低阶固有频率进行数值计算。最后以该叶片为研究对象，构建一套大叶片模态参数识别试验系统，采用单点激励中的“不测力法”，加速度信号经过有限脉冲滤波器（FIR）和快速FFT变换后，得到最大挥舞、摆振方向(Max flapwise、Max edgewise)的低阶固有频率值。将计算结果与试验结果作对比，验证了矩阵传递算法应用于大叶片低阶固有频率识别的可行性。模态参数识别试验得到的频率值，也为后续的风电叶片疲劳加载试验打下基础。

Abstract

The low-frequency solution using the traditional Bernoulli-Euler Beam Model is very difficult to solve because of the wind turbine blade cross-section for an irregular features. A new identification method for the wind blade low-frequency natural frequency - matrix transfer algorithm is proposed. Many two nodes which are separated into beams along the blade span and the transfer matrix of each segment is obtained. Transfer matrix is equivalent to the total number of segments for the transfer matrix of the product. The aerobalde3.6-56.4 wind turbine blade low-frequency is identification using the calculated programming through the introduction of boundary conditions. Finally, a modal parameter identification test system is setup. The low- frequency for the Max flapwise direction and Max edgewise direction is got with the single-point excitation “unmeasured strength method” by the accelerator signal passing the FIR filter and FFT. The calculated and experimental results are compared and verified the feasibility for transfer matrix algorithm using on the large blade low-frequency identification. The modal parameter identification test to get the frequency value lay the foundation for the wind turbine blade fatigue loading test.

导出引用

黄雪梅;张磊安. 风电叶片低阶频率识别的近似解法及试验[J]. 振动与冲击, 2012, 31(18): 78-82

Huang Xue-mei;Zhang Lei-an. The low-frequency identification approximate algorithm and test for wind turbine blade[J]. Journal of Vibration and Shock, 2012, 31(18): 78-82