基于光学测量方法的柔性圆柱涡激振动响应试验
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摘要
通过水槽试验研究在均匀流作用下细长柔性圆柱涡激振动的动力响应。采用一种新的光学测量方法直接测量圆柱的振动位移。分析在不同张力和约化速度下圆柱的振动位移、频谱、控制频率和运动轨迹的响应特性,得到在不同张力下完整的涡激振动锁定区间,初始分支、上端分支和下端分支等响应状态,圆柱涡激振动的锁定机制,以及张力的影响作用。
Water flume tests are conducted to investigate the dynamic responses of the vortex-induced vibration(VIV)of a flexible cylinder in uniform flow.The vibration displacement of the cylinder is measured directly by a new optical method.The response characteristics of the vibration displacement,spectrum,dominant frequency and moving trail of the flexible cylinder under different tensions and reduced velocities are analyzed.The complete lock-in regions of VIV are successfully excited for different tensions.The response includes initial branch,upper branch,lower branch and desynchronization regime.The lock-in regime of VIV of a flexible cylinder considering the influence of the tension is obtained.
Water flume tests are conducted to investigate the dynamic responses of the vortex-induced vibration(VIV)of a flexible cylinder in uniform flow.The vibration displacement of the cylinder is measured directly by a new optical method.The response characteristics of the vibration displacement,spectrum,dominant frequency and moving trail of the flexible cylinder under different tensions and reduced velocities are analyzed.The complete lock-in regions of VIV are successfully excited for different tensions.The response includes initial branch,upper branch,lower branch and desynchronization regime.The lock-in regime of VIV of a flexible cylinder considering the influence of the tension is obtained.
引文
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[3] TRIM A D,BRAATEN H,LIE H,et al.Experimental investigation of vortex-induced vibration of long marine risers[J].Journal of Fluids and Structures,2005,21(03):335-361.
[4]唐国强,吕林,滕斌,等.大长细比柔性杆件涡激振动实验[J].海洋工程,2011,29(01):18-25.
[5] GUO H Y,LOU M.Experimental study on coupled cross-flow and in-line vortex-induced vibration of flexible risers[J].China Ocean Engineering,2008,22(01):123-129.
[6] SANAATI B,KATO N.A study on the effects of axial stiffness and pre-tension on VIV dynamics of a flexible cylinder in uniform cross-flow[J].Applied Ocean Research,2012(37):198-210.
[7] ZHU H,LIN P,YAO J.An experimental investigation of vortex-induced vibration of a curved flexible pipe in shear flows[J].Ocean Engineering,2016,121:62-75.
[8] HUERA HUARTE F J,BEARMAN P W.Wake structures and vortex-induced vibrations of a long flexible cylinderpart 1:dynamic response[J].Journal of Fluids and Structures,2009,25(06):969-990.
[9] VANDIVER J K,JAISWAL V,JHINGRAN V.Insights on vortex-induced,traveling waves on long risers[J].Journal of Fluids and Structures.2009,25(04):641-653.
[10] JAUVTIS N,WILLIAMSON C H K.The effect of two degrees of freedom on vortex-induced vibration at low mass and damping[J].Journal of Fluid Mechanics,2004,509(509):23-62.
[2] CHAPLIN J R,BEARMAN P W,HUERA HUARTE F J,et al.Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current[J].Journal of Fluids and Structures,2005,21(01):3-24.
[3] TRIM A D,BRAATEN H,LIE H,et al.Experimental investigation of vortex-induced vibration of long marine risers[J].Journal of Fluids and Structures,2005,21(03):335-361.
[4]唐国强,吕林,滕斌,等.大长细比柔性杆件涡激振动实验[J].海洋工程,2011,29(01):18-25.
[5] GUO H Y,LOU M.Experimental study on coupled cross-flow and in-line vortex-induced vibration of flexible risers[J].China Ocean Engineering,2008,22(01):123-129.
[6] SANAATI B,KATO N.A study on the effects of axial stiffness and pre-tension on VIV dynamics of a flexible cylinder in uniform cross-flow[J].Applied Ocean Research,2012(37):198-210.
[7] ZHU H,LIN P,YAO J.An experimental investigation of vortex-induced vibration of a curved flexible pipe in shear flows[J].Ocean Engineering,2016,121:62-75.
[8] HUERA HUARTE F J,BEARMAN P W.Wake structures and vortex-induced vibrations of a long flexible cylinderpart 1:dynamic response[J].Journal of Fluids and Structures,2009,25(06):969-990.
[9] VANDIVER J K,JAISWAL V,JHINGRAN V.Insights on vortex-induced,traveling waves on long risers[J].Journal of Fluids and Structures.2009,25(04):641-653.
[10] JAUVTIS N,WILLIAMSON C H K.The effect of two degrees of freedom on vortex-induced vibration at low mass and damping[J].Journal of Fluid Mechanics,2004,509(509):23-62.