The invention discloses a method for directly forecasting wave load of a crane ship, which comprises the following steps of: establishing a hydrodynamic grid model, establishing a mass model with weight distribution of the whole ship, and obtaining speed potential under regular waves through analysis and calculation; obtaining a virtual mass inertia moment of a heavy object on the hoisting crane by adopting a mass decomposition method; rewriting a quality matrix equation; an inertia internal load is obtained by calculating hydrodynamic force, and wave bending moment and wave shearing force of the front end section of the mass section and a frequency response function of ship motion and load are calculated; a response spectrum is obtained by setting short-term sea conditions and wave spectrums, and short-term forecasting is conducted on the response spectrum through a spectrum analysis method; and according to the probability distribution of each short-term sea condition in the long life cycle, a long-term load extremum forecast of the hull structure is obtained. According to the method, the correct wave load of the crane ship is successfully obtained; and the problem of wave load forecasting when a heavy object is not in the length range of the ship can be solved.
本发明公开了一种用于起重船波浪载荷直接预报方法,其包括以下步骤:建立水动力网格模型,建立具有全船重量分布的质量模型,通过分析计算,在规则波下,得到速度势;采用分解质量方法得到起重吊上的重物的虚拟质量惯性矩;改写质量矩阵方程;通过计算水动力得到惯性内载荷,并计算出质量段前端剖面的波浪弯矩和波浪剪力以及船舶运动和载荷的频率响应函数;通过设定短期海况和波浪谱,得到响应谱,使用谱分析方法对响应谱进行短期预报;再根据每个短期海况在长寿命周期内的概率分布,得到船体结构的长期载荷极值预报。本发明成功得到了起重船正确的波浪载荷;同样可解决大重量物体不在船长范围内的波浪载荷预报问题。
Method for directly forecasting wave load of crane ship
用于起重船波浪载荷直接预报方法
2023-04-04
Patent
Electronic Resource
Chinese
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