摘要
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 ap-plied 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 incid-ence.
作者
邹志鸿
李威
ZOU Zhi-hong;LI Wei(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration（CISSE）,Shanghai 200240,China)
出处
《舰船科学技术》
北大核心
2018年第8期119-122,共4页
Ship Science and Technology
关键词
有限元
声学覆盖层
参数等效
声目标强度
finite element method
anechoic coatings
parameter inversion
acoustic target strength
