Time domain simulation of nonlinear ship motions using an impulse response function method
Time domain simulation of nonlinear ship motions using an impulse response function method
复制标题
使用脉冲响应函数法对非线性船舶运动进行时域仿真
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
G. Zaraphonitis
中科院分区：
文献类型：
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作者：
Shukui Liu;A. Papanikolaou;G. Zaraphonitis
本文提出了一种基于脉冲响应函数概念的非线性时域方法。针对船舶在海上六自由度非线性运动的仿真，应用动量守恒定理推导了运动方程，并在时域上进行了数值求解。水动力系数由线性位势理论确定，而运动方程中考虑了某些非线性项，如振幅波的激励、船体几何实际润湿所产生的精确恢复力和力矩以及半经验非线性粘性阻尼。最后，在考虑大角度运动时，保留了非线性惯性项。通过对S-175船体、DTC船体和KVLCC2船体等已建立的基准船舶模型的研究，对所开发的理论方法和计算机代码进行了验证。本方法的结果与其他数值代码和现有实验数据之间的一致性很好，这证实了所开发的数值方法能够提供可靠的预测。
In this paper, a nonlinear time domain method based on the impulse response function concept is presented. For the simulation of the six DOF nonlinear motions of a ship in seaways, the equations of motion are derived by application of the momentum conservation theorem and numerically solved in the time domain. Hydrodynamic coefficients are determined by linear potential theory, whereas certain nonlinear terms are considered in the equations of motion, such as the excitation by large amplitude waves, the exact restoring forces and moments resulting from the actual wetting of the ship hull geometry and the semi-empirical nonlinear viscous damping. Finally, nonlinear inertia terms are retained when considering large angles of motions. The validation of the developed theoretical method and computer code has been conducted by the study of well-established benchmark ship models, namely the S-175 hull, the DTC hull and the KVLCC2 hull. Good agreement has been observed between the results of the present method, other numerical codes and available experimental data, which confirm the capability of the developed numerical approach to deliver reliable predictions.