基于多种组合算法的船附体结构设计优化

Design optimization of ship attachment structure based on multiple combined algorithms

为了减少船舶的阻力,提升船舶快速性和耐波性,本文将添加球鼻首的DDG1000驱逐舰作为原始船型,研究增加尾压浪板、鳍和水翼对船体性能的影响。首先,将原始模型添加尾压浪板,并且caeses软件平台下进行全参建模,基于组合优化算法策略进行优化。设置2套组合优化方案,经对比发现,sobol算法和NSGA-II组合优化方案得到的模型更为优越。添加尾压浪板优化后的模型,在2.02 m/s和1.77 m/s航速下,优化后模型阻力都减少2.5%,证明尾压浪板有减阻特性。将添加尾压浪板优化后的船体后作为初始模型,添加鳍和水翼,并基于组合算法策略,进行多维参数优化。经数值计算,发现鳍和水翼并不能起到减阻效果,但是在一定航速下,鳍与水翼可以抑制兴波,进而减少剩余阻力。最终,在规则波条件下,进行数值模拟,发现安装尾压浪板、鳍与水翼附体后,波浪增阻增大,当λ/L超过0.9时,波浪增阻小于优化后,安装附体后船体,升沉与纵摇以及耐波性均得到不同程度的改善。

In order to reduce the resistance of the ship and improve the speed and seakeeping of the ship, this paper takes the DDG1000 destroyer with bulbous nose as the original ship type to study the effect of adding stern wave plates, fins and hydrofoils on the hull performance. First of all, the original model is added with a wake board, and full-parameter modeling is performed under the caeses. software platform, which is optimized based on the combination optimization algorithm strategy. This paper sets up two sets of combined optimization schemes. After comparison, it is found that the model obtained by the sobol algorithm and the NSGA-II combined optimization scheme is more superior. Adding the optimized model of the tail pressure wave board, at 2.02 m/s and 1.77 m/s speed, the resistance of the optimized model is reduced by 2.5%,which proves that the tail pressure wave board has drag reduction characteristics. Then the hull optimized by adding the stern wave plate is used as the initial model, fins and hydrofoils are added, and multi-dimensional parameter optimization is performed based on the combined algorithm strategy. After numerical calculations, it is found that the fins and hydrofoils do not have the effect of drag reduction, but at a certain speed, the fins and hydrofoils can suppress wave making, thereby reducing residual drag. Finally, under regular wave conditions, a numerical simulation was performed and it was found that after installing the tail pressure wave plate, fin and hydrofoil appendage, the wave resistance increased. When L exceeds 0.9, the wave resistance increase is less than the optimized hull after installing the appendage. Heave, pitch and seakeeping have been improved to varying degrees.