Prediction of non-linear ship responses in waves considering forward speed effects
Prediction of non-linear ship responses in waves considering forward speed effects
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考虑前进速度影响的非线性船舶波浪响应预测
DOI：
10.1080/09377255.2016.1221607
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发表时间：
2016
影响因子：
2.2
通讯作者：
el Moctar
中科院分区：
文献类型：
--
作者：
Riesner;von Graefe;Shigunov;el Moctar
本文介绍了一种用于确定船舶在波浪中的非线性响应(运动和载荷)的非线性时间域边界元方法。用Cummins的一般方法在时间域中表示运动方程。水动力分为惯性力、辐射力、绕射力、弗劳德-克里洛夫力和恢复力。辐射力是通过舰船的脉冲响应与运动速度卷积在时间域中确定的。计算了瞬时湿表面上的Froude-Krylov力和恢复力，考虑了船舶运动、原波和定常波系。由入射波绕射的线性问题产生的复力幅值计算绕射力。利用线性水动力阻尼系数或附加质量可以确定船舶的冲击响应。在这项工作中，这两种方法进行了比较。对三种不同船型在不同航速下用该方法计算的船舶运动与模型试验、基于Ranse的模拟结果以及线性频域结果进行了比较。结果表明，卷积积分很好地表示了辐射力。基于阻尼系数的卷积积分在零速时显示出明显的优势。随着前进速度的提高，增加的基于质量的卷积积分在某些情况下会导致更好的结果。
This article describes the development of a non-linear time-domain boundary element method to determine non-linear ship responses (motions and loads) in waves. The general approach by Cummins was used to express the equation of motion in the time domain. Hydrodynamic forces were split into inertia, radiation, diffraction, Froude–Krylov and restoring components. Radiation forces were determined in time domain by convolution of the impulse response of the ship with the motion velocity. The Froude–Krylov and restoring forces were computed over the instantaneous wetted surface, taking into account ship motions, the undisturbed wave and stationary wave system. Diffraction forces were computed from the complex force amplitude resulting from the linear problem of the incident wave diffraction. The impulse response of the ship can be determined using the linear hydrodynamic damping coefficients or added masses. In this work, these two approaches were compared. Ship motions calculated with the developed method were compared with model test and RANSE-based simulations as well as with linear frequency domain results for three different ship types at various forward speeds. It was shown that the convolution integral represents the radiation forces satisfactorily. The convolution integral based on damping coefficients showed distinct advantages at zero speed. With increasing forward speed, the added mass-based convolution integral leaded in some cases to better results.
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DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
Jens Ley;S. Sigmund;O. E. Moctar
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DOI：
--
发表时间：
2014
期刊：
影响因子：
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1993
期刊：
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DOI：
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发表时间：
2009
期刊：
影响因子：
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作者：
H. Söding;V. Bertram
通讯作者：
V. Bertram
DOI：
--
发表时间：
2012
期刊：
影响因子：
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作者：
H. Söding
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H. Söding