円柱構造物の抗力方向流力振動に関する研究 : 第2報,円柱に作用する抗力方向付加流体力の非線形性に関する検討(機械力学,計測,自動制御)

概要

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Precise measurements of added fluid forces acting on a circular cylinder in in-line direction were conducted with some different forcing amplitude conditions in a water tunnel to investigate their nonlinear characteristics. In the previous report, characteristics of added fluid forces were reported in the case that forcing amplitude is 5%. In this report, the experimental results in the case that forcing amplitude is 2.5% and 10% are described and compared with those of 5% amplitude condition. As a result, it was found that added damping forces are strongly dependent on cylinder amplitude, while added mass coefficient is insensitive to it. The measured added damping force was reduced to exciting parameter, which denotes dimensionless exciting fluid force. The characteristics of the exciting parameter agree quantitatively with the in-line oscillation behavior of an elastically supported cylinder in a cross flow obtained by previous free oscillation tests. Furthermore, the effects of fluid damping to the exciting parameter were discussed on the basis of the experimental results in detail.
社団法人日本機械学会の論文
2002-10-25