In consideration of the problem of the fluid-structure coupling numerical calculation under an transient load with free-surface effect,this paper built a modified doubly asymptotic approximation (DAA) equation considering the free surface wave-making effect based on the DAA.The equation was introduced to the fluid-structure interacting calculation of the structures transient motion problems near the free-surface,and a modified DAA2 equation was given.By comparing the results of numerical calculation with the experiment,the reasonability of the procedure was validated.This paper analyzed the effects of different water depths on the structure dynamic characteristics of fluid-solid interaction.The research results indicate that the free-surface effect has a great influence on the structure dynamic characteristics,especially on the metaphase and anaphase of the structured motion.%针对自由液面效应影响下的瞬态载荷作用下圆柱体的流固耦合数值计算问题,在双渐近法(DAA)的基础上,经推导得到考虑自由液面兴波效应的修正DAA方程.将该方程引入到自由面附近结构瞬态运动问题的流固耦合计算中,给出修正二阶双渐近法(DAA2)方程.将数值计算结果与实验结果相比较,验证了程序的合理性.在此基础上,分析了水深对结构流固耦合动态特性的影响.研究结果表明:自由液面效应对近自由液面附近结构的动态特性(尤其是结构运动中后期)有很大影响.
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