深水立管两向自由度涡激振动的数值分析  

Numerical analysis of two-degrees-of-freedom VIV of deepwater riser

作　　者：唐世振[1] 黄维平[1] 刘建军[1] 

机构地区：[1]中国海洋大学海洋工程山东省重点实验室,青岛266100

出　　处：《振动与冲击》2010年第9期206-211,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目资助(50639030)

摘　　要：对更加符合实际情况的两向自由度涡激振动进行数值分析。研究了四种不同质量比(m*=14.45,8.30,3.50和1.87)情况时,顺流向振动与横向振动幅值和频率之间的关系。结果表明,在大质量比(m*=14.45,8.30)时,顺流向振动频率基本可以看做横向振动频率的2倍,并且顺流向振动幅值相对于横向振动幅值来说可以忽略不计,符合现有实验研究结果;当质量比较小(m*=3.50,1.87)时,顺流向振动幅值并不能被忽略,尤其在顺流向处于锁频时。两向振动的主频率基本维持2倍关系,但是除主频率外在顺流向和横向振动频率中,还具有相同或近似相同的振动频率成分。For more approaching to the realistic case,a numerical method was used to analyze the two degrees of freedom vortex-induced vibration(VIV).The relationship was studied between the in-line vibration frequency and the cross-flow frequency for four cases of mass ratios(m=14.45,8.30,3.50 and m=1.87).The results show that the in-line frequency will be twice of that in cross-flow direction when the mass ratio m=14.45 and 8.30,the response amplitude in in-line direction can be neglected compared with that in cross-flow direction,which is in accordance with the experimental results.When the mass ratio m=3.50 and1.87,the in-line response amplitude can't be neglected,especially when the in-line vibration is under a lock-in situation.The same relationship holds for the main frequency,but desides the main frequency,in the spectra of in-line and cross vibrations there exist still the same or approxiamtely the same other frequency components.

关 键 词：海洋工程 深水立管 涡激振动 两向自由度 

分 类 号：TU311.3[建筑科学—结构工程]