航行船舶的三维非线性水弹性分析

基于Wu提出的浮体二阶水弹性理论1],研究大浪中航行船舶的非线性水弹性响应,给出了数值方法和计算结果.在二阶水弹性分析中,主要考虑了大角度刚体转动和瞬时湿表面变化引起的非线性水动力.根据三维线性水弹性理论2],采用移动脉动源格林函数和Kelvin定常兴波假定,求解了对二阶水动力做主要贡献的一阶速度势及响应.最后以航行于不规则波中的小水线面双体船为例,讨论了航速和定常兴波流场对水弹性响应的影响,并对线性和非线性响应的预报结果进行了比较.

Three-dimensional non-linear hydroelastic analysis on ships with forward speed

The theory,numerical methods and the calculated results of the non-linear hydroelastic responses of a ship traveling in rough seas are investigated based on the second order hydroelasticity theory of ships described by Wu et al(1997).The non-linear hydrodynamic actions induced by the rigid body rotations and the variations of instantaneous wetted surface area are included in the second order analysis.The first order wave potentials and responses,which are sure to make the major contributions to the second order hydrodynamic actions,are obtained by employing the translating and pulsating source Green function and the Kelvin steady wave flow solution based on the linear three dimensional hydroelasticity theory(Bishop et al,1986).The influences of the forward speed and the steady wave flow on the responses,and the differences of the predicted linear and non-linear responses are illustrated by the numerical examples of a Small Waterplane Area Twin Hull Ship traveling with forward speed of 11 and 12kns in irregular waves.