有限長円柱のインライン振動に関する水槽実験(流体工学,流体機械)

概要

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A bluff body like a marine structure can be vibrated variously by a separation flow around it. In this study, we focused on in-line oscillation of a circular cylinder under free vibration tests in two degrees of freedom. We studied typical characteristics of in-line oscillation of circular cylinders both in a smooth flow and in a turbulent flow in water tunnel tests. The circular cylinders with finite span lengths were supported elastically in two degrees of freedom. As a result, the response amplitude in the 2nd excitation region is dampened more sensitively with increasing reduced mass-damping parameter C_n than in the 1st excitation region compared with the results of circular cylinder that can oscillate only in one degree of freedom. Also the amplitude in 2nd excitation region is dampened in a turbulent flow, and the lissajous figure of a circular cylinder changed from a figure of 8 to a complex ellipse.
社団法人日本機械学会の論文
2005-03-25