蛋形复合材料耐压壳声目标强度分析

Acoustic target strength analysis of composite egg-shaped pressure hulls

为了研究蛋形复合材料耐压壳的水下声目标强度问题,首先以满足强度和屈曲条件的最小厚度蛋形耐压壳为研究对象,采用有限元方法建立声固耦合计算模型,然后分析了材料类型、蛋形系数、复合材料的厚度与缠绕角参数对声目标强度的影响,最后分析了一种带金属封头的蛋形耐压壳的水下声目标强度。研究结果表明,相同外形条件下,复合材料蛋形耐压壳的声目标强度最大值低于钛合金耐压壳;声波沿着蛋形复合材料耐压壳的尖端方向入射时,中高频声目标强度最低且与蛋形系数成反比。建议在深海条件下应用蛋形耐压壳时采用尖端向上的布置方案。

In order to study acoustic target strength of underwater composite egg-shaped pressure hulls,the minimum thickness egg-shaped pressure hulls satisfying the strength and buckling condition are taken as research object.An acoustic-solid coupling model of egg-shaped pressure hull is established with finite element method.The influence of design parameters such as material type,egg-shaped coefficient,composite material thickness and winding angle on acoustic target strength is analyzed.Finally,acoustic target strength of egg-shaped pressure hull composed of composite material with metal head is analyzed.The results show that under the same shape conditions,the maximum acoustic target strength of composite egg-shaped pressure hulls is lower than that of titanium.When sound waves incident along the tip direction of egg-shaped pressure hull,medium and high frequency acoustic target strength is the lowest and it is inversely proportional to the egg-shaped coefficient.It is suggested that egg-shaped pressure shell should be arranged with the tip upward in deep sea.