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 fording 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.
|ジャーナル||Nippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C|
|出版ステータス||Published - 2002 10|
ASJC Scopus subject areas
- Mechanics of Materials
- Mechanical Engineering
- Industrial and Manufacturing Engineering