45度大倾角倾斜柔性圆柱涡激振动不相关原则实验验证

PDF(2331 KB)

振动与冲击 ›› 2017, Vol. 36 ›› Issue (7) : 177-183.

论文

徐万海，马烨璇，杜杰，罗浩

作者信息 +

Test verification for independence principle applied in vortex-inducedvibrations of a flexible cylinder inclined at 45°

XU Wanhai,MA Yexuan,DU Jie,LUO Hao#br#

Author information +

文章历史 +

摘要

涡激振动是诱发海洋立管、海底管道与海洋风机系泊缆线等细长柔性圆柱结构疲劳损伤的重要因素。已有研究大多关注结构轴向与来流垂直的情况，实际的海洋工程中，圆柱结构轴向与来流并不完全垂直，存在一定倾斜角度。针对这种复杂的情况，倾斜圆柱涡激振动的不相关原则被提出，即假定倾斜圆柱涡激振动与来流速度在结构轴向的垂直方向投影分量引起的垂直圆柱情况等价。然而，不相关原则的正确与否至今仍然存在争议。本文为了论证倾斜柔性圆柱涡激振动不相关原则的正确性，设计了室内模型实验，开展了长径比为350，倾角为45o的倾斜柔性圆柱涡激振动实验，采用应变传感器测量结构应变信息，运用模态分析法对实验数据进行处理。通过倾斜圆柱与垂直圆柱的实验结果对比，发现在控制模态转化区域，倾斜圆柱更容易被激发高阶模态，同时倾斜圆柱与垂直圆柱在测点处的应变和位移差异较大，并均出现高频特征。最终得出了较大倾角状态下倾斜柔性圆柱涡激振动不相关原则不成立的结论。

Abstract

Vortex-induced vibrations (VIV) can cause fatigue damage of marine pipeline and mooring lines.The current VIV studies focus on a canonical problem that a circular cylinder freely to oscillates within a flow perpendicular to the body axis.In practical applications,cylinder structures are often inclined with respect to the direction of the oncoming flow.Aiming at this complex situation,the independence principle (IP) that the VIV of an inclined circular cylinder is assumed to be equivalent to the VIV of a vertical circular cylinder excited by the projection component of oncoming flow velocity in the direction perpendicnlar to the cylinder’s axis is proposed.However,more attentions need to be paid to the validity of the independence principle.Here,laboratory tests were conducted for vortex-induced vibrations (VIV) of an inclined flexible cylinder with a ratio of length to diameter of 350 and an incline angle of 45° in order to check the validity of the independence principle (IP).Strain gages were adopted to measure the cylinder’s dynamic response,a modal analysis approach was used to analyze the measured data.The test results of a vertical cylinder and the inclined cylinder were compared.It was shown that the higher order modes are easy to be excited for the inclined cylinder in the controlled mode transition region; the strain and displacement at measured points of both cylinders are obviously different and the higher order modes’ features of VIV responses are observed.All the results indicated that the use of IP may not be correct to describe the VIV of the flexible cylinder inclined at 45°.

导出引用

徐万海，马烨璇，杜杰，罗浩. 45度大倾角倾斜柔性圆柱涡激振动不相关原则实验验证[J]. 振动与冲击, 2017, 36(7): 177-183

XU Wanhai,MA Yexuan,DU Jie,LUO Hao. Test verification for independence principle applied in vortex-inducedvibrations of a flexible cylinder inclined at 45°[J]. Journal of Vibration and Shock, 2017, 36(7): 177-183

参考文献

[1]. Sarpkaya,T. Vortex induced oscillations: a selective review[J]. Journal of Applied Mechanics 1979,46 (2): 241-258.
[2]. Bearman, P.W. Vortex shedding from oscillating bluff bodies[J]. Annual Review of Fluid Mechanics, 1984, 16: 195-222.
[3]. Vandiver, J.K. Dimensionless parameters important to the prediction of vortex induced vibration of long, flexible cylinders in ocean currents[J]. Journal of Fluids and Structures, 1993, 7:423-455.
[4]. Sarpkaya,T. A critical review of the intrinsic nature of vortex-induced vibrations[J]. Journal of Fluids and Structures, 2004, 19: 389-447.
[5]. Facchinetti, M.L., Langre, E.de., Biolley, F. Coupling of structure and wake oscillators in vortex-induced vibrations[J]. Journal of Fluids and Structures, 2004,19 (2): 123-140.
[6]. Gabbai, RD., Benaroya, H. An overview of modeling and experiments of vortex -induced vibration of circular cylinders[J]. Journal of Sound and Vibration, 2005, 282: 575-616.
[7]. Violette, R., Langre, E. de., Szydlowski, J. Computation of vortex-induced vibrations of long structures using a wake oscillator model: Comparison with DNS and experiments[J]. Computers and Structures, 2007, 85: 1134-1141.
[8]. Williamson, C.H.K., Govardhan, R. A brief review of recent results in vortex-induced vibrations[J]. Journal of Wind engineering and industrial Aerodynamics, 2008, 96: 713-735.
[9]. 宋芳,林黎明,林国灿.圆柱涡激振动的结构-尾流振子耦合模型研究[J],力学学报,2010,42(3):357-365.
Song Fang, Lin Liming, Lin Guocan. The study of vortex-induced vibrations by computation using coupling model of structure and wake oscillator[J]. Chinese Journal of Theoretical and Applied Mechanics, 2010, 42(3):357-365.
[10]. Xiaodong Wu,FeiGe, YoushiHong. A review of recent studies on vortex-induced vibrations of long slender cylinders[J]. Journal of Fluids and Structures, 2012, 28:292-308.
[11]. Hongxiang Xue, WenyongTang,XueQu. Prediction and analysis of fatigue damage due to cross-flow and in-line VIV for marine risers in non-uniform current[J]. Ocean Engineering,2014,83:52-62.
[12]. 黄维平,刘娟,唐世振.考虑流固耦合的大柔性圆柱体涡激振动非线性时域模型[J]. 振动与冲击,2012,31 (9):140-143．
HUANG Wei-ping, LIU Juan, Tang Shi-zhen. Nonlinear model of vortex induced vibration of flexible cylinder in consideration of fluid-structure interaction[J].Journal of Vibration and Shock,2012,31(9): 140-143．
[13]. 唐友刚,樊娟娟,张杰,王丽元,桂龙.高雷诺数下圆柱顺流向和横向涡激振动分析[J].振动与冲击,2013,32(13):88-
92.
TANG You-gang, FAN Juan-juan, ZHANG Jie, WANG Li-yuan, GUI Long. In line and transverse vortex-induced vibration analysis for a circular cylinder under high Reynolds number [J]. Journal of Vibration and Shock,2013,32(13) : 88-92．
[14]. 高云,任铁,付世晓,熊友明,赵勇.柔性立管涡激振动响应特性试验研究[J],振动与冲击,2015,34(17):6-11.
GAO Yun, REN Tie, FU Shi-xiao, XIONG You-ming, ZHAO Yong. Tests for response characteristics of VIV of a flexible riser [J].Journal of Vibration and Shock, 2015, 34(17): 6-11.
[15]. Hanson,A.R. Vortex-shedding from yawed cylinders[J]. AIAA Journal, 1966, 4(4):738-740.
[16]. Van Atta, C. W. Experiments on vortex shedding from yawed circular cylinders [J]. AIAA Journal 6, 1968:931-933.
[17]. Franzini, G.R., Gonçalves, R.T., Meneghini, J.R., et al One and two degrees-of-freedom vortex-induced vibration experiments with yawed cylinders[J].Journal of Fluids and Structures, 2013, 42:401-420.
[18]. Zhao, M., Cheng, L., Zhou, T. Direct numerical simulation of three-dimensional flow past a yawed circular cylinder of infinite length[J]. Journal of Fluids and Structures, 2009, 25:831-847.
[19]. Jain, A., Modarres-Sadeghi, Y. Vortex-induced vibrations of a flexibly mounted inclined cylinder [J]. Journal of Fluids and Structures, 2013,43: 28-40.
[20]. 李寿英,顾明. 斜、直圆柱绕流的CFD 模拟[J],空气动力学学报,2005,23(2):222-227.
LI Shou-ying, GU Ming. Numerical simulation for flow around perpendicular and oblique circular cylinders[J]. Acta Aerodynamic Sinica,2005,23(2):222-227.
[21]. 许常悦,孙智,王从磊.偏斜来流对圆柱跨声速绕流的影响[J].应用数学和力学,2014,35(10):1135-1142.
XU Chang-yue, SUN Zhi, WANG Cong-lei. Effects of Tilted Free-Stream on the Transonic Flow past a Circular Cylinder[J]. Applied Mathematics and Mechanics, 2014, 35(10):1135-1142.
[22]. 杜晓庆,费陈杰,况中华,赵燕. 展向剪切流作用下斜置圆柱气动特性研究[J].振动与冲击.2014, 33(21):31-37.
DU Xiao-qing，FEI Chen-jie,KUANG Zhong-hua,ZHAO Yan. Aerodynamic characteristics of an inclined circular cylinder in a span-wise linear shear flow[J]. Journal of Vibration and Shock, 2014,33(21):31-37.
[23]. Bourgueta,R. Karniadakis,G.E., Triantafyllou. M.S. On the validity of the independence principle applied to the vortex-induced vibrations of a flexible cylinder inclined at 60o[J]. Journal of Fluids and Structures 2015, 53:58-69.
[24]. Ji-ning Song, Lin Lu, Bin Teng, Han-IIPark, et al. Laboratory tests of vortex-induced vibrations of a long flexible riser pipe subjected to uniform flow [J]. Ocean Engineering, 2011, 38:1308-1322.
[25]. Lie,H., Kaasen, K.E. Modal analysis of measurements from a large-scale VIV model test of a riser in linearly sheared flow[J]. Journal of Fluids and Structures, 2006, 22: 557-575.
[26]. Chaplin, J. R., Bearman, P. W., Huera Huarte, F. J., Pattenden, R. J. Laboratory measurements of vortex-induced vibrations of a vertical tension riser in a stepped current[J]. Journal of Fluids and Structures, 2005, 21: 3-24.
[27]. Trim, A.D., Braaten, H., Lie, H., Tognarelli, M.A., Experimental investigation of vortex-induced vibration of long marine risers[J]. Journal of Fluids and Structures, 2005, 21: 335-361.
[28]. 张建侨,宋吉宁,吕林等.柔性立管涡激振动实验的数据分析[J],中国海洋平台,2009,24(4):26-32.
ZHANG Jian-qiao,SONG Ji-ning,LV Lin, et al. Analysis on the Vortex-induced vibrations experimental results of flexible risers[J]. China Offshore Platform, 2009,24(4):
26-32.