采用参数等效方法计算了敷设声学覆盖层的结构物水下低频声目标强度。首先应用有限元模拟充水阻抗管的方法获取圆台型空腔声学覆盖层敷设在与计算模型具有相同厚度的钢材上的声反射系数；其次，根据参数等效前后反射系数相等的原理，利用遗传算法反演声学覆盖层的等效物理参数（杨氏模量、泊松比、损耗因子）；最后将反演得到的等效参数应用于均匀阻尼层，获得模型的水下声目标强度，验证该方法的可行性。结果表明，该方法能有效且高效地获得敷设圆台型空腔声学覆盖层的结构物水下低频声目标强度。
It's generally difficult to predict the acoustic target strength of a submarine with anechoic coatings by conventional finite element method (FEM). Parameter inversion is a common method to solve this problem. Some researchers have studied the parameter inversion about normal incidence of anechoic coatings. In this paper, the FEM of impedance tube is used to obtain acoustic reflection coefficient of anechoic coatings. Then the genetic algorithm is applied to acquire the physical parameters of viscoelastic material which is equivalent to anechoic coatings. The LMS Virtual Lab is used to construct finite element model of the anechoic coatings to validate the parameter inversion with normal incidence.
2018,40(8): 119-122 收稿日期：2018-02-07
DOI：10.3404/j.issn.1672-7649.2018.08.023
分类号：TB564;U661.4
作者简介：邹志鸿(1992-),男,硕士研究生,研究方向为船舶振动与噪声控制
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