3712 流力弾性振動発生時の減衰の非線形性の影響(J13-2 流動励起振動2(非線形・制振・最適設計),J13 流体関連の騒音と振動)

概要

論文の詳細を見る
An estimated damping ratio is used to evaluate the occurrence of the fluid-elastic instability. However, many structures contain some nonlinearity, especially in their damping ratios. Then, it is a great problem which value is used for the estimation of the critical flow velocity. As the nonlinear damping usually shows the increasing trend to the vibration amplitude of tubes, vibrations of a tube with the negative damping due to the fluid flow are calculated for some parametric cases, where the structural damping component has a linear relation to the tube-amplitude. The results show the tube plays as a kind of limit cycle in a few seconds, and the final amplitude depends on the nonlinear trend of the structural damping. It is suggested that this nonlinear damping trend is used for the design estimation of the fluid-elastic instability.
社団法人日本機械学会の論文
2006-09-15