614 液体の入った狭いすきま内にある構造物の流体付加減衰解析(流体-構造連成振動とスロッシング)(OS.17 : 流体関連振動のダイナミクスと制御)

概要

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In the case that a structure surrounded by liquid in a very narrow gap, fluid mass and fluid damping become very large. In such a case, vibrations characteristics (e.g. natural frequency and damping ratio) in liquid are different from those in air. Therefore, many researchers have studied analytical methods to estimate fluid force on concentric cylinders separated by liquid in a gap. This paper presents an analytical method to estimate fluid damping for a cylinder with projections surrounded by liquid in a very narrow gap. In this model, leakage flow occurs from the top of leakage areas (see Fig.1), which are located in the gap. In this method, we can estimate the fluid damping in nonlinear cases such as when the amplitude of vibrations become as large as the gap. This paper presents an analytical method to estimate fluid damping for beam modes of an elastic cylinder with projection surrounded by liquid in a very narrow gap, including the effect of leakage flow.
社団法人日本機械学会の論文
2001-08-03