风雨激振中拉索与水线耦合运动规律研究

李 暾;陈政清;李寿英

振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 71-78.

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振动与冲击 ›› 2010, Vol. 29 ›› Issue (12) : 71-78.
论文

风雨激振中拉索与水线耦合运动规律研究

  • 李 暾1,2; 陈政清1; 李寿英1
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ANALYTICAL STUDY OF COUPLED MOTION BETWEEN CABLE AND RIVULET IN RAIN-WIND INDUCED VIBRATION

  • LI Tun1,2;CHEN Zheng-qing1; LI Shou-ying1
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摘要

在建立了水线运动与拉索振动相互耦合的三维连续弹性拉索风雨激振理论模型的基础上,通过振型分解,得到了以拉索各阶振型表示的拉索运动微分方程。利用该理论模型对实际拉索发生风雨激振时拉索和水线的运动规律进行了分析,结论表明:拉索风雨激振具有“限速”、“限幅”的特征;拉索的振动包含多阶拉索固有频率,拉索模态间相互耦合,并不断转化;水线沿拉索表面周向的运动具有一定的周期性,运动时程曲线并非呈正弦规律,其运动频率与拉索振动频率基本一致;水线沿拉索轴向分布不是一条直线,处于平均竖向气动力突降区的水线长度对拉索的振幅有较大的影响。

Abstract

Base on formulation of the model of rain-wind-induced vibration of three-dimensional continuous elastic cable with the coupled cable-rivulet system, cable equations expressed with modes of cable were obtained using modes decoupling method. Cable and rivulet movement regulations were analyzed when rain-wind- induced vibration occurred. It is shown that rain-wind- induced vibration of cable has characteristics of “velocity restricted” and “amplitude restricted”. The motion of cable includes several natural modes which coupled and transformed mutually. The circular motion of rivulet is non-sine rule with period. Frequencies of moving rivulet are basically in accordance with cable frequencies. The distribution of rivulet along axial direction of cable is not a straight line. The length of rivulet in the sudden dive range of aerodynamic force has an important effect on cable amplitude.

关键词

风雨激振 / 三维连续弹性拉索 / 运动水线 / 耦合运动

Key words

rain-wind-induced vibration / three-dimensional continuous elastic cable / actual moving rivulet / coupled motion.

引用本文

导出引用
李 暾;陈政清;李寿英. 风雨激振中拉索与水线耦合运动规律研究[J]. 振动与冲击, 2010, 29(12): 71-78
LI Tun;CHEN Zheng-qing;LI Shou-ying. ANALYTICAL STUDY OF COUPLED MOTION BETWEEN CABLE AND RIVULET IN RAIN-WIND INDUCED VIBRATION[J]. Journal of Vibration and Shock, 2010, 29(12): 71-78

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