Abstract
In the paper, an experiment investigation was conducted for one- and two-degree of freedom vortex-induced vibration (VIV) of a horizontally-oriented cylinder with diameter of 11 cm and length of 120 cm. In the experiment, the spring constants in the cross-flow and in-line flow directions were regulated to change the natural vibration frequency of the model system. It was found that, in the one-degree of freedom VIV experiment, a “double peak” phenomenon was observed in its amplitude within the range of the reduced velocities tested, moreover, a “2T” wake appeared in the vicinity of the second peak. In the two-degree of freedom VIV experiment, the trajectory of cylinder exhibited a reverse “C” shape, i.e., a “new moon” shape. Through analysis of these data, it appears that, besides the non-dimensional in-line and cross-flow natural vibration frequency ratios, the absolute value of the natural vibration frequency of cylinder is also one of the important parameters affecting its VIV behavior.
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The project was supported by the National Natural Science Foundation of China (51009033) and the Fundamental Research Funds for the Central Universities.
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Kang, Z., Jia, LS. An experimental investigation of one- and two-degree of freedom VIV of cylinders. Acta Mech Sin 29, 284–293 (2013). https://doi.org/10.1007/s10409-013-0014-5
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DOI: https://doi.org/10.1007/s10409-013-0014-5