Flow-induced vibration in in-line direction of a circular cylinder in a flow (2nd report, nonlinear characteristics of added fluid forces in in-line direction acting on a circular cylinder in a flow)

Takashi Nishihara, Shigehiko Kaneko, Ryoichi Yasukawa, Tatsuo Watanabe

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Pages (from-to)2880-2888
Number of pages9
JournalNippon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Volume68
Issue number10
Publication statusPublished - 2002 Oct 1
Externally publishedYes

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Circular cylinders
Fluids
Damping
Tunnels
Water

Keywords

  • Added Damping
  • Added Mass
  • Circular Cylinder
  • Fluid Force
  • Forced Vibration
  • In-Line Oscillation
  • Nonlinear Characteristics
  • Vibration Coupled with Fluid Motion

ASJC Scopus subject areas

  • Mechanical Engineering

Cite this

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title = "Flow-induced vibration in in-line direction of a circular cylinder in a flow (2nd report, nonlinear characteristics of added fluid forces in in-line direction acting on a circular cylinder in a flow)",
abstract = "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.",
keywords = "Added Damping, Added Mass, Circular Cylinder, Fluid Force, Forced Vibration, In-Line Oscillation, Nonlinear Characteristics, Vibration Coupled with Fluid Motion",
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T1 - Flow-induced vibration in in-line direction of a circular cylinder in a flow (2nd report, nonlinear characteristics of added fluid forces in in-line direction acting on a circular cylinder in a flow)

AU - Nishihara, Takashi

AU - Kaneko, Shigehiko

AU - Yasukawa, Ryoichi

AU - Watanabe, Tatsuo

PY - 2002/10/1

Y1 - 2002/10/1

N2 - 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.

AB - 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.

KW - Added Damping

KW - Added Mass

KW - Circular Cylinder

KW - Fluid Force

KW - Forced Vibration

KW - In-Line Oscillation

KW - Nonlinear Characteristics

KW - Vibration Coupled with Fluid Motion

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