Spar平台垂荡—纵摇耦合运动的不稳定性  

Unstability of coupled heave-pitch motions for Spar platform

作　　者：刘利琴[1] 唐友刚[1] 王文杰[1] 

机构地区：[1]天津大学建工学院船舶与海洋工程系,天津300072

出　　处：《船舶力学》2009年第4期551-556,共6页Journal of Ship Mechanics

基　　金：国家863项目(2007AA09Z30);国家自然科学基金重点项目(NO.50639030)

摘　　要：研究了深水Spar平台垂荡—纵摇耦合不稳定运动的形式和条件。以经典Spar平台为例,基于垂荡包络线概念,分析了平台垂荡—纵摇耦合运动的相互放大效应及"舞动"运动。结果表明,当垂荡包络线周期与纵摇固有周期相等时,纵摇运动失稳;因纵摇对垂荡的耦合影响,垂荡幅值不断增大,同时垂荡运动的变化又影响纵摇运动,使得纵摇幅值小幅度增加,平台运动存在相互放大效应。纵摇失稳后,Spar平台将处在一种奇特的"舞动"运动形式。The form of unstable motion and its occurring condition for the coupled heave-pitch of Spar platform are studied. Taking a classic Spar platform as an example, the mutual amplifying and ＂dancing＂ motion of the coupled heave-pitch motion for the platform are investigated based on the idea of heave envelope. The results show that the pitch is unstable when the period of heave envelope is equal to the natural period of pitch;the amplitude of the heave is increasing because of the coupling influence of pitch on heave, it effects the pitch motion at the same time and the pitch amplitude is increased tardily, the mutual amplifying phenomena is found in the motion of platform. The platform performs special ＂dancing＂ motion after pitch unstable motion occurs.

关 键 词：SPAR平台 垂荡—纵摇耦合运动 相互放大效应 舞动运动 

分 类 号：U674.381[交通运输工程—船舶及航道工程]