基于背衬影响的水下声隐身夹芯复合材料结构设计

在考虑背衬影响的前提下,建立了3种典型水下声隐身夹芯复合材料的结构模型;从水声波动方程出发,推导了3种模型的传递矩阵、声反射系数和吸声系数,并通过试验验证了传递矩阵法的有效性;考虑吸声层厚度、密度、损耗因子、水层厚度等对声隐身性能的影响,应用数值方法对水下夹芯复合材料声隐身结构形式进行了设计,分析了各层材料参数对隐身结构反射系数和吸声系数的影响规律;在吸声层中附加了一层复合材料,有效地抑制了隐身结构的谐振峰,并研究了附加层的匹配位置,使隐身结构在不改变吸声层厚度的情况下获得了更好的声学性能.

Structural design on underwater acoustic stealth sandwich composite based on effect of backing

Based on the effect of backing,the underwater acoustic stealth sandwich composite was classified to establish three kinds of structural models.The corresponding transition matrixes,reflection coefficient and absorption coefficient were deduced from the acoustic wave equation.The results of transition matrix method were matched to the experimental data.The effect of acoustic stealth on the thickness,density,loss factors of absorption layer and the thickness of water were calculated.The structure of underwater sandwich composite was designed and the reflection coefficient and absorption coefficient response were analyzed with the numerical method.The resonance peak value was restrained by adding an additional composite layer within absorption layer.The acoustic performance of structure was enhanced by putting the additional layer in an appropriate location.