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

Huang Xue-mei;Zhang Lei-an

Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (18) : 78-82.

PDF(1471 KB)
PDF(1471 KB)
Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (18) : 78-82.
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The low-frequency identification approximate algorithm and test for wind turbine blade

  • Huang Xue-mei , Zhang Lei-an
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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.

Key words

wind turbine blade / low-frequency / transfer matrix algorithm / modal test system

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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
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