Comparison of numerical and experimental results of nonlinear wave-induced vertical ship motions and loads
Comparison of numerical and experimental results of nonlinear wave-induced vertical ship motions and loads
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DOI：
10.1007/s007730200007
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发表时间：
2002
影响因子：
2.6
通讯作者：
N. Fonseca;C. Guedes Soares
中科院分区：
文献类型：
--
作者：
N. Fonseca;C. Guedes Soares
提出了一种计算集装箱船在迎浪中行进时垂向响应的非线性时间域法。该方法假定由记忆函数的时间卷积、无限频率附加质量和辐射恢复系数表示的线性辐射力。精确计算了船体瞬时湿表面上的非线性静水恢复力和弗劳德-克里洛夫力。采用动量法计算了甲板上的绿水作用力。对不同的垂荡和纵摇运动、垂向加速度和垂向弯矩等不同垂向船舶响应的非线性效应进行了识别。这些非线性效应表现为传递函数随波幅的变化、时间信号的高次谐波、时间序列的偏移量和峰值的不对称性。数值结果和量化的非线性效应与实验结果进行了比较，表明该方法能够再现主要的非线性效应。
A nonlinear time-domain procedure is presented which is used to calculate the vertical responses of a container ship advancing in head waves. The method assumes linear radiation forces represented by time convolution of memory functions, infinite frequency added masses, and radiation restoring coefficients. The nonlinear hydrostatic restoring and Froude–Krilov forces are computed exactly over the instantaneous wetted surface of the ship's hull. Forces due to green water on deck are calculated using the momentum method. Nonlinear effects are identified on different vertical ship responses, namely on the heave and pitch motions, the vertical accelerations, and the vertical bending moment. These non-linear effects are expressed by the variation of the transfer function with the wave amplitude, the higher-order harmonics of the time signals, the offset of the time series, and the asymmetry of the peaks. The numerical results and the quantified nonlinear effects are compared with experimental results showing an ability to reproduce the main nonlinear effects.