摘要
将隐身夹芯复合材料代替附体结构钢质壳板,建立了斜入射条件下水中隐身夹芯复合材料结构的声学模型;从水声波动方程出发,推导了二维空间声波斜入射时的传递矩阵,及带空腔水附体结构的声反射系数和吸声系数表达式;对带空腔水附体结构模型进行了垂直入射声学试验,试验结果与传递矩阵法数值计算吻合较好;对试验模型进行了斜入射下声学性能数值计算,分析了入射角对反射系数和吸声系数的影响;考虑斜入射下夹芯层厚度、密度、损耗因子、及水层厚度等对隐身附体结构声学性能的影响,应用数值方法对水中隐身夹芯复合材料附体结构进行了声学设计,分析了各层材料参数和几何参数对隐身结构反射系数和吸声系数的影响规律。
The acoustic model of underwater acoustic stealth sandwich composite structure was built.The corresponding transition matrixes,reflection coefficient and absorption coefficient under in-plane oblique incidence were deduced from the acoustic wave equation.The acoustic frequency response of stealth added structure with water layer under vertical incidence was measured by experiment,and the results of transition matrix method match well with the experimental data.The influence of different oblique incidence angles was analyzed.The effects of thickness,density,loss factors of absorption layer and thickness of water on the acoustic stealth performance were calculated,the acoustic stealth structure with underwater sandwich composite material was designed,and the frequency responses of reflection coefficient and absorption coefficient were analyzed by numerical method with different material parameters and different geometrical parameters.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第5期49-54,共6页
Journal of Vibration and Shock
基金
国家973重大基础研究基金项目(51335020101)
国防重点预研基金项目
关键词
声隐身
斜入射
夹芯复合材料
附体结构
传递矩阵
acoustic stealth
oblique incidence
sandwich composite
added structure
transition matrix
