摘要
针对内波致水平剪切流使得隔水管发生多模态和高模态的响应问题,本文采用内波控制方程与刚盖边界条件,结合半经验的尾流振子模型以及隔水管的非线性振动方程,建立了隔水管在内波致剪切流流场中的涡激振动模型,给出了隔水管在内波致水平剪切流与背景流叠加作用下的涡激振动响应和功率谱密度分布情况。结果表明:内波致剪切流与背景流叠加后,引起锁振区间的变化,并激发了隔水管多模态涡激共振,隔水管会产生复合模态振动,疲劳影响更加复杂;高阶模态内波能量较小,对隔水管涡激振动影响较小,低模态内波对隔水管涡激振动影响更为显著。
Internal wave-induced horizontal shear flow may cause multi-and high-mode responses by a riser.By adopting the internal wave control equation and rigid cover boundary conditions,in combination with the semi-empirical wake oscillator model and the nonlinear vibration equation of risers,a vortex-induced vibration model of a riser in an internal wave shear flow field was established.The vortex-induced vibration response and the power spectral density distribution of the riser under the combined action of internal wave-induced horizontal shear and background flows were also determined.The results showed that superimposition of the internal-wave-induced shear flow and the background flow may cause variations in lock-in range,leading to multi-mode VIVs;moreover,vibration of the drilling riser with composite modes may occur on the riser.The effect of fatigue damage was complex.While the energy of internal waves with a high-order mode was small and exerted little influence on the vortex-induced vibration of the riser,low-mode internal waves demonstrated a more significant influence on this vibration.
作者
王琮
刘振纹
WANG Cong;LIU Zhenwen(CNPC Engineering Technology Research Co.,Ltd.,Tianjin 300451,China)
出处
《哈尔滨工程大学学报》
EI
CAS
CSCD
北大核心
2018年第9期1465-1471,共7页
Journal of Harbin Engineering University
关键词
涡激振动
内波
隔水管
背景流
尾流振子
多模态
约化速度
频率锁定
vortex-induced vibration(VIV)
internal waves
riser
background flow
wake oscillator
multi-mode
reduced velocity
frequency lock
作者简介
王琮(1978-),男,高级工程师.通信作者,王琮,E-mail:wangcong1021@mail.cnpc.com.cn.
