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Purpose <p>In recent years, the global wind power capacity is increasing rapidly. While wind turbines harvest wind energy to generate electricity, they also continue to vibrate under wind loads. Since the vibrations may reduce the service life of the wind turbine and thus increase average cost of electricity generation over the whole service life, the study of vibration suppression methods for the wind turbine is of great significance. Therefore, a wind turbine vibration suppression method based on the semi-active negative stiffness spring is proposed in this study.</p> Methods <p>By replacing the fixed-length connecting rod in a passive negative stiffness spring with a telescoping rod, a novel semi-active negative stiffness spring is proposed in this study. Based on the concept of insensitive frequency band, a design method of the controller for adjusting the length of the telescopic rod is further proposed. Simulations and experiments are conducted to verify the performance of the semi-active vibration isolator based on the proposed semi-active negative stiffness spring.</p> Results <p>The simulation results show that compared with the classic passive vibration isolator, the stroke of the proposed semi-active vibration isolator is reduced by 65% and the vibration suppression performance is better. Experimental results show that compared with the classical negative stiffness spring, the proposed semi-active negative stiffness spring can realize a wider range of high-static-low-dynamic stiffness with the same range of negative stiffness, thereby achieving better vibration suppression performance.</p> Conclusion <p>The vibration isolator based on the semi-active negative stiffness spring can effectively suppress the vibration of the wind turbine tower, and its performance is better than that of the classic passive vibration isolator and the vibration isolator based on the classical negative stiffness spring. For other vibration isolation systems, the proposed semi-active negative stiffness spring also has potential application value.</p>

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Vibration Suppression of a 19-DOF Wind Turbine Based on a Novel Semi-active Negative Stiffness Spring

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Haoyu Wang,
  • Michael Z. Q. Chen

摘要

Purpose

In recent years, the global wind power capacity is increasing rapidly. While wind turbines harvest wind energy to generate electricity, they also continue to vibrate under wind loads. Since the vibrations may reduce the service life of the wind turbine and thus increase average cost of electricity generation over the whole service life, the study of vibration suppression methods for the wind turbine is of great significance. Therefore, a wind turbine vibration suppression method based on the semi-active negative stiffness spring is proposed in this study.

Methods

By replacing the fixed-length connecting rod in a passive negative stiffness spring with a telescoping rod, a novel semi-active negative stiffness spring is proposed in this study. Based on the concept of insensitive frequency band, a design method of the controller for adjusting the length of the telescopic rod is further proposed. Simulations and experiments are conducted to verify the performance of the semi-active vibration isolator based on the proposed semi-active negative stiffness spring.

Results

The simulation results show that compared with the classic passive vibration isolator, the stroke of the proposed semi-active vibration isolator is reduced by 65% and the vibration suppression performance is better. Experimental results show that compared with the classical negative stiffness spring, the proposed semi-active negative stiffness spring can realize a wider range of high-static-low-dynamic stiffness with the same range of negative stiffness, thereby achieving better vibration suppression performance.

Conclusion

The vibration isolator based on the semi-active negative stiffness spring can effectively suppress the vibration of the wind turbine tower, and its performance is better than that of the classic passive vibration isolator and the vibration isolator based on the classical negative stiffness spring. For other vibration isolation systems, the proposed semi-active negative stiffness spring also has potential application value.