すきま流励起振動に関する研究 : 第3報,壁面が回転振動する場合に作用する流体力のモーメントの評価

概要

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An analytical study is presented on leakage-flow-induced vibrations in the case of a one-dimensional, narrow, tapered passage. The moment of fluid-dynamic forces acting on the walls of the passage when one of them is vibrating in the rotational mode is determined. It is found that the area increment ratio, on which condition negative fluid-dynamic damping and negative fluid-dynamic stiffness can occur, changes remarkably with the location of the pivot. Negative fluid-dynamic stiffness can occur in the case of divergent and convergent passage. Negative fluid-dynamic damping is apt to occur in the case of divergent passage, but if the pivot is situated slightly behind the center of the passage, it can also occur in the case of convergent passage. If the pivot is situated at the inlet of the passage, negative fluid-dynamic stiffness and negative fluid-dynamic damping rarely occur.
社団法人日本機械学会の論文
1988-11-25