基于能量方法的拉索尾流驰振风洞试验研究

Investigation on wake galloping of parallel cables by wind tunnel test based on an energy method

为了研究近距失稳区并列拉索尾流驰振性能,发展了基于能量方法的风洞试验方法。采用强迫振动装置重现了拉索尾流驰振现象,通过能量判断方法分析了下游拉索尾流驰振的运动方向和不稳定区域。从气动力对下游拉索做功的角度,研究了其振动机理,并对比分析了下游拉索不同振幅、来流风速以及频率对尾流驰振性能的影响。试验研究表明,基于能量分析方法所得到的结果与已有结论较为吻合,验证了该方法的可靠性。

In order to study the wake galloping characteristics in a close spacing instability range, a series of wind tunnel tests based on an energy method were carried out. The imposed motion along quasi-elliptical orbits reproduced wake galloping phenomenon of a parallel cable by the forced vibration device. Based on the energy analysis method, the motion trajectory and the unstable region of the downstream cable was analyzed. And the mechanism of the wake galloping was studied from the work done by aerodynamic forces. The influence of amplitudes, velocities of wind flow and vibration frequencies on wake galloping of cables were further discussed. The investigation results show that the results with the energy method agree well with classical results and prove the reliability of the analysis method. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.