航速及定常流场对航行船体结构水弹性力学特性的影响

EFFECTS OF FORWARD SPEED AND STEADY FLOW ON HYDROELASTIC BEHAVIOUR OF TRAVELLING SHIPS

本文侧重于研究航速对船舶结构水弹性力学响应的影响。在文中所叙述的航行船体的三维线性水弹性力学的频域分析方法中，计入了物面边界条件、线性自由面条件以及广义水动力系数和广义波浪激励力积分方程中所有与航速相关项的贡献。对近波面潜航椭球体和在波面上航行的半椭球型弹性水面船体进行了一系列的数值计算，讨论了船体细长比、航速、非均匀定常流场及满足不同自由面条件的格林函数的选用等对船体水动力系数、波浪激励力及结构响应的影响。与整体弹性船模试验结果及三维时域方法、二维方法计算结果进行了比较。

In the present paper the influence of forward speed on the hydroelastic behavior of the travelling ships in waves is investigated. The contributions of the forward speed in all the terms, such as in the wetted surface boundary condition, in the linear free surface condition, and in the integral forms of the hydrodynamic coefficients and the general wave exciting forces, are included in the present method. A serial calculations of an ellipsoid moving beneath wave surface, and a surface ship of the semi-ellipsoid form travelling in waves have been made. The effects of the slenderness, speed, non-uniform steady flow on the hydroelastic properties of the ships are evaluated and discussed. The comparisons of the numerical results obtained by the present method with 3-d time domain method, 2-d method and the model test have been carried out.