大型豪华邮轮在迎浪中非线性运动预报方法研究

目前工程上通常采用的线性理论耐波性预报方法尚不能够准确地预报船舶非线性运动,而全非线性理论预报又因为耗时长不能广泛应用于实际工程中。现将基于切片理论的频域线性预报方法加以扩展,考虑湿表面变化的非线性因素,在时域中求解船舶非线性运动。通过对某艘大型豪华邮轮的非线性运动耐波特性研究,对其理论计算结果与试验结果比较,表明该预报方法能够较好地评估该船的非线性运动耐波特性。给出的计算方法简便、实用,适用于船舶纵向非线性运动预报,对船舶设计阶段的耐波性能评估具有一定的工程实用价值。

Research on the Nonlinear Motion Prediction Method of a Large Luxury Cruise in Head Sea

Currently, linear seakeeping prediction method is usually adopted for engineering applications, which cannot predict the nonlinear ship motion accurately; however, fully nonlinear theory is limited by its time consuming computation cost for wider engineering practice. In this study, the frequency domain strip theory is expanded to take into account nonlinear factors such as the change of wetted surface, and to solve the nonlinear ship motion problem in the time domain. The nonlinear seakeeping characteristics of a large luxury cruise are studied and comparison between the numerical and experimental results shows that this prediction method can properly evaluate the nonlinear seakeeping characteristics of the ship. This method is simple, practical and suitable for nonlinear longitudinal ship motion prediction and has some engineering significance in evaluating the ship seakeeping performance during the preliminary design stage.