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Experimental Investigation on Soft Galloping and Hard Galloping of Triangular Prisms

机译：三角棱镜的软舞动和硬舞动的实验研究

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摘要

The studies currently on soft galloping (SG) and hard galloping (HG) are scarce. In this study, SG and HG of spring-mounted triangular prisms in a water channel are investigated experimentally. A power take-off system (PTO), a spring system, additional weights, and different triangular prisms were used to achieve the variations in damping coefficient c , system stiffness K , oscillation mass m and section aspect ratios α, respectively. The present paper proves that the VIV (vortex-induced vibration) lower branch can be observed in the SG response. In SG response, VIV branches are incomplete while the galloping branch is complete, and galloping can be self-initiated only in the self-excited region. On the contrary, in HG response, VIV branches are complete, the galloping branch is incomplete, and galloping can only be initiated by external excitation at a velocity exceeding the critical velocity. As c and m increase, or K and α decrease, the oscillation mode of a triangular prism gradually transitions from SG to CG (critical galloping), and continues to HG. The amplitude in VIV branch is the main reason causing the onset of galloping in SG response. A critical damping coefficient c c , which is dependent on m , K and α, is proposed to predict the occurrences of SG, CG and HG. When c < c c , SG occurs; when c > c c , HG occurs; when c = c c , CG occurs.
机译：目前关于软驰（（SG）和硬驰gall（HG）的研究很少。在这项研究中，实验研究了水通道中弹簧安装的三角棱镜的SG和HG。动力输出系统（PTO），弹簧系统，附加配重和不同的三棱柱分别用于实现阻尼系数c，系统刚度K，振动质量m和截面纵横比α的变化。本文证明了在SG响应中可以观察到VIV（涡激振动）下分支。在SG响应中，VIV分支不完整而舞动分支完成，并且舞动只能在自激区域自发。相反，在HG响应中，VIV分支是完整的，舞动的分支是不完整的，并且舞动只能通过外部激励以超过临界速度的速度来引发。随着c和m的增加，或K和α的减小，三角棱镜的振荡模式从SG逐渐过渡到CG（临界驰豫），并持续到HG。 VIV分支中的振幅是导致SG响应疾驰的主要原因。提出了一个取决于m，K和α的临界阻尼系数c c来预测SG，CG和HG的出现。当c c c时，发生HG。当c = c c时，发生CG。

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