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首页> 外文期刊>日本造船学会论文集 >An Improvement of Broaching Prediction with a Nonlinear 6 Degrees of Freedom Model
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An Improvement of Broaching Prediction with a Nonlinear 6 Degrees of Freedom Model

机译：非线性六自由度模型对拉削预测的改进

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This paper reports on the improvements of a simulation model for ship motions in following and quartering waves. The authors use a wave-piercing tumblehome vessel as a subject ship. The existing 4-DoF (degrees of freedom) model shows some limitation in its capability for predicting broaching of this vessel. In a free-running model experiment for the vessel, we observed rudder and propeller emersion from the water leading to broaching. This rudder and propeller emersions can significantly reduce steering performance. To express these rudder and propeller emersions, we should take account of not only roll but also pitch and heave. Therefore the authors develop a 6-DoF model. With the heave and pitch motion, we can calculate the local draft variation for calculating wave exiting forces and moments. Roll restoring variations are one of the important factors to estimate roll motions. Therefore we theoretically estimate restoring variations in wave then we found the tendency of variation dramatically changes due to the roll angle. Submergence of superstructure can be important for that variation. We also consider the variation of maneuvering coefficients and rudder forces in waves which are relevant to broaching. To estimate these variations, we conduct PMM tests, straight-line tests and rudder angle tests in waves using a scale model of subject ship. With some of these improvements, we obtain better agreements with experimental results than existing 4-DoF model.
机译：本文报告了在跟随波和四分之一波中船舶运动仿真模型的改进。作者将穿浪的不倒翁船用作主题船。现有的4-DoF（自由度）模型在预测此船只拉削的能力方面显示出一定的局限性。在该船的自由运行模型实验中，我们观察到方向舵和螺旋桨从水中冒出导致拉削。方向舵和螺旋桨的出现会显着降低转向性能。为了表达这些舵和螺旋桨的变化，我们不仅要考虑侧倾，还要考虑俯仰和升沉。因此，作者开发了6自由度模型。通过升沉和俯仰运动，我们可以计算出局部吃水变化，以计算出波力和力矩。侧倾恢复变化是估计侧倾运动的重要因素之一。因此，我们从理论上估计波的恢复变化，然后我们发现变化的趋势会由于侧倾角而急剧变化。上层建筑的淹没对于这种变化可能很重要。我们还考虑了与拉削有关的操纵系数和方向舵力在波浪中的变化。为了估计这些变化，我们使用主题船的比例模型在波浪中进行PMM测试，直线测试和舵角测试。通过这些改进中的一些，我们获得了比现有4-DoF模型更好的实验结果一致性。

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