基于不同试验方法和非线性水弹性时域理论的鞭振弹振响应研究

船体主尺度增大会导致严重的鞭振和弹振现象,这会增大船体结构的极限载荷和疲劳损伤.为了深入探究船体的振动响应,文中在拖曳水池对某万箱集装箱船分别进行了分段模型的自航和拖航试验.分析了不同海况下自航和拖航这两种试验方式对鞭振和弹振响应的影响.为计及不同振动频率成分对载荷响应的影响,提出一种考虑波浪记忆效应的非线性水弹性方法.文中提出了一种求解延时函数的方法,能够解决高频区域的阻尼系数的计算限制.最后,船舯弯矩试验结果分别和线性与非线性理论结果进行了比较,发现文中提出的非线性方法能够更好地预报弹性船体的振动响应.

Research on Whipping and Springing Responses of Hull based on Different Experimental Method and Nonlinear Hydroelastic Time-domain Theory

The growth in size of hull may result in serious whipping and springing phenomenon that can increase both the ultimate load and fatigue damage on the hull structure. In order to study the vi-bration responses of hull better, the self-propulsion and towing segmented ship model experiments of a 10000-TEU containership were carried out in a towing tank. The effect of self- propulsion and tow-ing test methods on whipping and springing responses in different sea states is analyzed. In order to consider the effect of various vibration frequency components on load responses, a nonlinear hydroe-lastic method considering the wave memory function is proposed. A method is proposed for time-do-main retardation function to solve limitation in the calculation of damping coefficient at high fre-quency. Finally, the measured results on the central hull are compared with those calculated by the linear hydroelastic theory and nonlinear hydroelastic theory, and it indicates that the nonlinear hy-droelastic method proposed in this paper can predict the vibration responses better.