Conference Paper Experimental study on the effects of frequency ratio on in-line oscillation of two square cylinders in tandem arrangement

Matsuda, Kazutoshi  ,  Kato, Kusuo  ,  Aratsu, Itsuki  ,  Tashiro, Yoko  ,  松田, 一俊  ,  加藤, 九州男  ,  荒津, 樹  ,  田代, 容子

Description
In a past research concerning the in-line oscillation of two square cylinders with an aspect ratio of B/D=1 arranged in tandem along the flow, a spring supported test was conducted by changing the distance between the two cylinders by elastically supporting a cylinder and fixating another one. However, in real structures, both cylinders are considered to be elastically supported in most cases. Therefore, in this research, a spring supported test was conducted under the condition that both of cylinders with an aspect ratio of B/D=1 arranged in tandem were elastically supported, and the effect of the difference of model support condition on the in-line oscillation response was experimentally investigated. Furthermore, the effect of the natural frequency ratio of the two square cylinders on the in-line oscillation response was also discussed. Flow visualization test by smoke at the time when the two square cylinders were shaking by the forced oscillating method was conducted based on the phase difference and amplitude ratio obtained from the spring supported test. The result of the spring supported test was discussed using the results from the flow visualization tests by smoke. Furthermore, the hysteresis in flow depending upon the distance between the two square cylinders was reported in a previous report. This also was discussed from the result of flow visualization tests.
Meeting Information: First International Symposium on Flutter and its Application (May 15-17, 2016. Mielparque-tokyo), Minato-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
形態: カラー図版あり
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https://repository.exst.jaxa.jp/dspace/bitstream/a-is/612437/1/AA1630046019.pdf

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