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      Experimental study on wake-induced vibrations of two circular cylinders with two degrees of freedom

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      https://www.riss.kr/link?id=A105103569

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      다국어 초록 (Multilingual Abstract)

      Wind tunnel tests are conducted to investigate wake-induced vibrations of two circular cylinders with a center-to-center spacing of 4 diameters and attack angle varying from 0 to 20 for Reynolds numbers between 18,000 and 168,800. Effects of structural damping, Reynolds number, attack angle and reduced velocity on dynamic responses are examined. Results show that wake-induced vortex vibrations of the downstream cylinder occur in a wider range of the reduced velocity and have higher amplitudes in comparison to the vortex-induced vibration of a single circular cylinder. Two types of wake-induced instability phenomena with distinct dynamic characteristics are observed, which may be due to different generation mechanisms. For small attack angles like 5 and 10, the instability of the downstream cylinder characterizes a one-degree-of-freedom (1-DOF) oscillation moving in the across-wind direction. For a large attack angle like 20, the instability characterizes a two-degree-of-freedom (2-DOF) oscillation with elliptical trajectories. For an attack angle of 15, the instability can transform from the 1-DOF pattern to the 2-DOF one with the increase of the Reynolds number. Furthermore, the two instabilities show different sensitivity to the structural damping. The 1-DOF instability can be either completely suppressed or reduced to an unsteady oscillation, while the 2-DOF one is relatively less sensitive to the damping level. Reynolds number has important effects on the wake-induced instabilities.
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      Wind tunnel tests are conducted to investigate wake-induced vibrations of two circular cylinders with a center-to-center spacing of 4 diameters and attack angle varying from 0 to 20 for Reynolds numbers between 18,000 and 168,800. Effects of structura...

      Wind tunnel tests are conducted to investigate wake-induced vibrations of two circular cylinders with a center-to-center spacing of 4 diameters and attack angle varying from 0 to 20 for Reynolds numbers between 18,000 and 168,800. Effects of structural damping, Reynolds number, attack angle and reduced velocity on dynamic responses are examined. Results show that wake-induced vortex vibrations of the downstream cylinder occur in a wider range of the reduced velocity and have higher amplitudes in comparison to the vortex-induced vibration of a single circular cylinder. Two types of wake-induced instability phenomena with distinct dynamic characteristics are observed, which may be due to different generation mechanisms. For small attack angles like 5 and 10, the instability of the downstream cylinder characterizes a one-degree-of-freedom (1-DOF) oscillation moving in the across-wind direction. For a large attack angle like 20, the instability characterizes a two-degree-of-freedom (2-DOF) oscillation with elliptical trajectories. For an attack angle of 15, the instability can transform from the 1-DOF pattern to the 2-DOF one with the increase of the Reynolds number. Furthermore, the two instabilities show different sensitivity to the structural damping. The 1-DOF instability can be either completely suppressed or reduced to an unsteady oscillation, while the 2-DOF one is relatively less sensitive to the damping level. Reynolds number has important effects on the wake-induced instabilities.

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      참고문헌 (Reference)

      1 Fujino, Y., "wind resistant design of bridges in Japan" Springer Japan 197-229, 2012

      2 Yongle Li, "Wind-tunnel study of wake galloping of parallel cables on cable-stayed bridges and its suppression" 한국풍공학회 16 (16): 249-261, 2013

      3 Wardlaw, R.L., "Wind tunnel and analytical investigations into the aeroelastic behavior of bundled conductors" 94 (94): 642-654, 1975

      4 김선중, "Wake galloping phenomena between two parallel/unparallel cylinders" 한국풍공학회 18 (18): 511-528, 2014

      5 Wong, H.Y., "Vortex-induced wake buffeting and its suppression" 6 (6): 49-57, 1980

      6 Brika, D., "Vortex-induced oscillations of two flexible circular cylinders coupled mechanically" 69 (69): 293-302, 1997

      7 Fujino, Y., "Vibration mechanisms and controls of long-span bridges: a review" 23 (23): 248-268, 2013

      8 Sumner, D., "Two circular cylinders in cross-flow: a review" 26 (26): 849-899, 2010

      9 Xu, G., "Strouhal numbers in the wake of two inline cylinders" 37 (37): 248-256, 2004

      10 Zdravkovich, M.M., "Review of interference-induced oscillations in flow past two parallel circular cylinders in various arrangements" 28 (28): 183-199, 1988

      1 Fujino, Y., "wind resistant design of bridges in Japan" Springer Japan 197-229, 2012

      2 Yongle Li, "Wind-tunnel study of wake galloping of parallel cables on cable-stayed bridges and its suppression" 한국풍공학회 16 (16): 249-261, 2013

      3 Wardlaw, R.L., "Wind tunnel and analytical investigations into the aeroelastic behavior of bundled conductors" 94 (94): 642-654, 1975

      4 김선중, "Wake galloping phenomena between two parallel/unparallel cylinders" 한국풍공학회 18 (18): 511-528, 2014

      5 Wong, H.Y., "Vortex-induced wake buffeting and its suppression" 6 (6): 49-57, 1980

      6 Brika, D., "Vortex-induced oscillations of two flexible circular cylinders coupled mechanically" 69 (69): 293-302, 1997

      7 Fujino, Y., "Vibration mechanisms and controls of long-span bridges: a review" 23 (23): 248-268, 2013

      8 Sumner, D., "Two circular cylinders in cross-flow: a review" 26 (26): 849-899, 2010

      9 Xu, G., "Strouhal numbers in the wake of two inline cylinders" 37 (37): 248-256, 2004

      10 Zdravkovich, M.M., "Review of interference-induced oscillations in flow past two parallel circular cylinders in various arrangements" 28 (28): 183-199, 1988

      11 Dielen, B., "Mechanism of interference galloping of two identical circular cylinders in cross-flow" 54-55 : 289-300, 1995

      12 Yagi, T, Arima, M., "Investigation on wake-induced instabilities of parallel circular cylinders based on unsteady aerodynamic forces" 2015

      13 Ruscheweyh, H., "Interference gallopinginvestigations concerning the phase lag of the flow switching" 43 (43): 2047-2056, 1992

      14 Alam, M.M., "Global aerodynamic instability of twin cylinders in cross-flow" 41 (41): 135-145, 2013

      15 Paidoussis, M.P., "Fluidstructure interactions: Cross-flow-induced instabilities" Cambridge University Press 2011

      16 Kim, S., "Flowinduced vibrations of two circular cylinders in a tandem arrangement. Part 1: Characteristics of vibration" 97 (97): 304-311, 2009

      17 Ljungkrona, L., "Flow visualization and surface pressure measurement on two tubes in an inline arrangement" 6 (6): 15-27, 1993

      18 Hardy, C., "Field observations on windinduced conductor motions" 9 (9): 43-60, 1995

      19 Gu, M., "Experimental investigation of rainwind-induced vibration of cables in cable-stayed bridges and its mitigation" 93 (93): 79-95, 2005

      20 Caetano, E., "Cable vibrations in cable stayed bridges"

      21 Price, S.J., "An investigation of the effect of mechanical damping to alleviate wake-induced flutter of overhead power conductors" 2 (2): 53-71, 1988

      22 Ting, D.K., "An experimental study on the fluidelastic forces for two staggered circular cylinders in cross-flow" 12 (12): 259-294, 1988

      23 Ruscheweyh, H.P., "Aeroelastic interference effects between slender structures" 14 (14): 129-140, 1983

      24 Takeguchi, M., "Aerodynamic stabilization for wake-induced vibration in parallel hanger ropes of the Akashi Kaikyo Bridge" 37 (37): 300-306, 2012

      25 Yoshimura, T., "Aerodynamic stability of four medium span bridges in Kyushu district" 42 (42): 1203-1214, 1992

      26 Matsumoto, M., "Aerodynamic instabilities of twin circular cylinders" 33 (33): 91-100, 1990

      27 Kubo, Y., "Aerodynamic behavior of multiple elastic circular cylinders with vicinity arrangement" 54-55 : 227-237, 1995

      28 Tokoro, S., "A study on wake-galloping employing full aeroelastic twin cable model" 88 (88): 247-261, 2000

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