鉛直につり下げられた片持弾性送水管の横振動 : 管上端が鉛直方向に加振される場合

概要

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The lateral vibration of a cantilevered flexible pipe hanging vertically and conveying fluid, which is parametrically excited by the vertical motion at the upper end, is examined theoretically and experimentally. The complex amplitude equation of the vibration is derived from nonlinear coupled equations for axial flow velocity and lateral deflection of the pipe. Using the derived equation, the effects of the exciting frequency and amplitude on the steady-state vibration are mainly investigated just under the flow velocity corresponding to the neutral stability of the self-excited vibration of the pipe. Furthermore, the experiment was conducted with a flexible pipe model conveying water. The parametrically excited vibration of the pipe was observed as predicted in the theory.
1988-09-25