基于模型试验的张力腿平台涡激运动特性研究  

Vortex induced motion characteristics of a tension leg platform based on model tests

作　　者：李磊[1] 黄维平[1] 梁鹏[1] 

机构地区：[1]中国海洋大学山东省海洋工程重点实验室,青岛266100

出　　处：《振动与冲击》2016年第23期41-45,共5页Journal of Vibration and Shock

基　　金：国家自然科学基金(51079136;51179179)

摘　　要：采用模型试验方法，研究了雷诺数为2．5×10^3～2×10^4范围内张力腿平台的涡激运动问题。试验中设计了一套考虑水平和垂向系泊刚度的锚泊方案，捕捉到涡激运动中的“锁定”和“两支”等现象；试验结果表明：横流向和顺流向均发生了频率锁定现象，横向达到锁定范围的折合速度为 Ur ＝4．0～7．0，顺流向为 Ur ＝6．0～7．0，且横向运动居主导地位；在 Ur≤4．0的非锁定区，涡激升力模型满足斯特哈尔关系；而当 Ur ＞4．0时，该公式不再适用。试验结果也表明：流向角是影响平台运动轨迹的关键因素，当流向角为0°时，平台运动呈正“8字形”；15°时，运动轨迹为“香蕉形”；45°时，为略向左侧弯曲的扁“8字形”。In order to study vortex induced motions（VIM）of a tension leg platform（TLP）,the model tests were conducted in the range of Reynolds number 2.5 ×1 0^3-2 ×1 0^4 .The lock-in and two phase phenomena were caught after considering horizontal and vertical stiffnesses in a designed mooring scheme.The results showed that frequency-locking occurs both in the transverse and in-line directions,and the transverse motion has the predominate position;in this Reynolds number range,when the reduced velocity Ur is equal to 4.0 -7.0,the transvers motion enters the lock-in region;when the reduced velocity Ur is equal to 6.0 -7.0,the in-line motion enters the lock-in region;the lift force model satisfies Strouhal relation when Ur≤4.0;it is no longer suitable when Ur 〉4.0;the current incidence is the key factor influencing the motion trace;the TLP motion has a ‘8-shaped＇ track when the incidence is 0°,when the incidence is 1 5°,the TLP motion has a ‘banana-shaped＇ trace,when the incidence is 45°,the TLP motion has a flat ‘8-shaped＇ track bending to the left.

关 键 词：涡激运动 张力腿平台 模型试验 锁定区 折合速度 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]