舰船波浪弯矩响应的频率特性

非直壁式舰船在高浪级和高航速下的弯矩响应中，除了含有低频遭遇频率成分外，还存在着一定数量的遭遇频率的倍频成分及船体各谐调的垂向总振动频率成份，它们都会对舰船波浪弯矩的非线性响应产生相应的影响。如果舰船的第一谐调垂向总振动频率正好是遭遇频率的整数倍，这时弯矩的非线性响应将达到极值。本文从模型试验及理论计算两方面分析了舰船波浪弯矩的频率特性，对船体载荷响应理论的发展及设计载荷的确定具有指导意义。

The Frequency Characteristics of Ship Vertical Wave Bending Moments

When ship sails in severe waves with high speed, its hull will experience large amplitude motions and nonlinear wave loads. Apart from the low wave-encounter frequency and high whipping frequencies, there are a lot of frequency components that are the mumbers of wave-encounter frequency existed in the vertical wave bending moments. These components will significantly influence the non-lin- earity of wave-induced and combined bending moment responses. If the first harmonious frequency is just an integral multiple of the wave-encounter frequency, the responses will reach their extreme points. Based on the model experimental and nonlinear strip theory results, this paper investigates the phenomena of multiple frequencies and discusses the characteristics of all componets. It will be mean- ingful to develop ship wave loads theory and determine ship hull design loads.