大型集装箱船在斜浪工况下的扭矩特征研究及结构强度分析

随着大型集装箱船的发展,针对斜浪条件下扭矩载荷特性及其结构强度的分析研究日益重要.本文采用选定的某大型集装箱船开展动态载荷(DLA)分析,建立了水动力湿表面计算模型和质量模型,研究基于扭矩传递函数和主要载荷控制参数的斜浪设计波参数确定方法,分析超越概率水平对扭矩载荷计算结果的影响.考虑典型斜浪参数和超越概率水平,分析对比DLA扭矩与船舶规范(ABS和HCSR)扭矩的差异及原因,提出集装箱船扭矩载荷计算与应用的建议.在此基础上,选定3个斜浪计算工况(45°,60°和75°)开展结构强度分析,通过分析应力计算云图,研究扭矩载荷下船体结构响应的关键位置及其应力趋势.该研究可为大型集装箱船结构设计过程中船体梁扭转强度计算、舱口角隅设计、抗扭箱强度评估等方面提供有益的参考.

Study on Torque Characteristics and Structural Strength of Large Container Ships under Oblique Waves

With the rapid development of large container ships, study on the characteristics of torque load and structural strength under oblique waves is becoming increasingly important. In this paper, a wet surface model and a mass model were built up based on a large container ship to determine the de-sign wave parameters according to the torque response function and dominant load parameters. The relationship between the exceeding probability level and calculated torque was analyzed. Considering the typical oblique wave parameters and exceeding probability level, the calculated torques were stud-ied respectively to indicate the differences based on the methods of dynamic load approach (DLA), American Bureau of Shipping (ABS) and Common Structural Rules for Bulk Carriers and Oil Tankers (HCSR) . The main reasons of the difference were highlighted. Some proposals on how to calculate and apply the torque load to container ships were also presented. Based on those proposals, three wave conditions (45° , 60° and 75° ) were chosen for further case study, where the key structural positions were identified under oblique waves by calculating the stress distribution. This study can serve as a good reference for structural design of large container ships, such as the torsional strength calculation of hull girder, the design of hatch corner and the strength evaluation of torsional box.