隔声去耦瓦抗冲击性能数值研究

Numerical Study on the Anti-shock Capability of Acoustic Insulated and Decoupled Tiles

在水下结构表面敷设隔声去耦材料是应用最广泛也是非常有效的一种提高水下航行器隐身性能的方法。但由于隔声去耦瓦含有空腔的特殊结构形式,该空腔结构形式在受到爆炸冲击波时,腔体将产生变形并吸收能量,这必然会对水下航行器的抗冲击性能产生影响。基于有限元法,通过改变敷设在结构表面的隔声去耦瓦性能参数(包括空腔结构形式、空腔尺寸及材料厚度等),采用ABAQUS大型非线性动力学分析软件,对隔声去耦瓦空腔结构变形与冲击波能量吸收之间的关系进行了研究,得到了隔声去耦覆盖层空腔结构变形、速度及加速度与冲击波能量吸收之间的关系,并在此基础上,给出兼具抗冲和隔振功能的声学覆盖层结构设计建议。结果表明在声学覆盖层满足结构减振降噪要求情况下,建议尽量减小声学覆盖层的腔体形状。

Covering of acoustic insulated and decoupled tile materials is the widely used and very efficient way to improve the hiding capability of underwater vehicles. However, these tiles have a unique structure with cavity inside which may distort and absorb energies under the impact of explosive shock waves and thus affects the anti-shock performance of underwater vehicles. Based on FEM, by changing the tile parameters （the cavity shape and dimension, the layer thickness, etc.）, the relation between tile distortion and the impact energy absorption is investigated by general nonlinear dynamic software package-ABAQUS. As a result, the relation of tile layer distortion, velocity, and acceleration with respect to the energy absorption capability is established. Based on these relations, some suggestions are made to make balance between anti-shock performance and vibration isolating effect in design of the acoustic tile layers. The results show that once the noise and vibration control meet the requirements, the cavity shape of acoustic covering layer should be as minimum as possible.