导管架平台非线性随机响应分析  

NONLINEAR STOCHASTIC RESPONSE ANALYSIS OF JACKET-TYPE PLATFORMS

作　　者：钱江[1] 王秀喜[2] 

机构地区：[1]同济大学 [2]中国科学技术大学

出　　处：《海洋工程》1992年第1期10-19,共10页The Ocean Engineering

摘　　要：本文分析研究了导管架平台结构在随机波浪作用下的动力响应问题。采用空间刚架单元建立有限元方程。认为海浪是零均值、平稳、各态历经的高斯过程,波高谱服从P-M分布.利用线性波理论及广义Morison公式计算波浪载荷。计及流体与结构运动之间的耦合,用统计线性化方法处理非线性水动阻尼力。结构的均方响应通过迭代求得。计算了一个总高65m、工作水深55m的平台结构在多种工况下的均方响应,并分析比较了几种不同简化模型所得结果之间的差异。In this paper, the dynamic responses of jacket-type offshore platforms under random sea waves is studied,and the finite element of spatial frame is adopted. The ocean waves are considered to be zero mean, stationary and ergodic gaussian random processes specified by the P-M wave height spectrum. Linear wave theory and the generalized Morison equation are used to calculate the wave forces on the structure. The fluid-structure interaction is taken into consideration. The fluid drag, forces are linearized by stochastic linearization technique. The equivalent drag coefficient matrix is given in integral form,The mean-square responses of the structure are obtained by iteration. Numerical results of a platform with height of 65 Meters, standing in the depth of 55 meters, subujected to symmetrical and uhsy-mmetircal loads are presented and compared with other simplified models.

关 键 词：导管架平台 随机响应 Morison 动力响应问题 阻尼力 高斯过程 线性波 零均值 均方 波浪载荷 

分 类 号：P75[天文地球—海洋科学]