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本文系统地阐述了固定式海洋结构在考虑波浪与结构相互作用情况下的随机动力分析原理·问题的关键在于对波浪力中的非线性阻力项进行线性化,并使耦合的广义阻尼矩阵对角化,为此运用了统计等效线性化方法和迭代方法等,最后使问题归结为若干个独立的线性化的随机微分方程,而方便地予以解决。根据本文原理编成了SELIM和SELIM-1程序。经试用,获得满意的计算结果。七个自由度的算例只经过二、三次迭代即可使迭代误差小于百分之五。
This paper systematically expounds the principle of stochastic dynamic analysis of a fixed ocean structure considering the interaction between waves and structures. The key point is to linearize the nonlinear resistance in the wave force and to make the coupled generalized damping matrix diagonal. For this purpose, statistical equivalent linearization methods and iterative methods are used. Finally, the problem is reduced to a number of independent linearized stochastic differential equations that can be easily solved. The SELIM and SELIM-1 programs were compiled according to the principles of this article. After trial, satisfactory results are obtained. The seven-degrees-of-freedom case only makes two or three iterations to make the iteration error less than 5%.