船坞登陆舰声散射时频特征数值及试验研究

阐述了基于虚源法的板块元基本原理,以及目标强度和时域回波的计算方法。通过建立三维船坞登陆舰的网格模型,考虑水面反射以及船艉部分浸水的影响,计算得到了水平方位上的目标强度、由远场到近场回声强度的变化规律以及浅海水域下通过水雷正上方时回声强度的通过特性,并对这些结果进行的分析。通过开展运动水面舰船模型声散射湖上试验,获取了舰船模型时域回波特征,并与计算结果对比。研究结果表明,采用基于虚源法的板块元能够对船坞登陆舰的目标强度、回声强度以及时域回波结构给出比较准确的预报。研究结果将对提高船坞登陆舰声隐身特性,避开鱼雷和水雷等水中兵器的攻击提供一定的参考价值。

Numerical and experimental research on acoustic scattering time-frequency characteristics of dock landing ship

The image-source method based Planar Element Method (PEM) and the calculation methods of target strength and its time domain echo are described. By establishing a 3D meshing model of dock landing ship and taking surface reflection and the effect of stern partial flooding into consideration, the target strength of dock landing ship in the horizontal direction, the variation of the echo strength of dock landing ship from far field to near field and the variation of the echo strength of dock landing ship passing over a mine in the shallow water area are calculated and analyzed. Through the acoustic scattering experiment of moving warship model on lake, the time domain echo characteristics of the warship model are obtained and compared with the results of calculation. Research results show that the image-source method based PEM can accurately predict the target strength, the echo strength and echo structure of the dock landing ship, which could provide a reference for improving the stealth characteristics of dock landing ships and avoiding the attack of underwater weapons such as torpedo and mine.