粘弹性材料声辐射计算的二次建模理论研究(英文)  

Study of Twice Modeling Theory for Viscoelasitc Materials in Sound Radiation

作　　者：顾晓军[1] 殷学文[1] 彭东立[1] 朱蓓丽[1] 

机构地区：[1]上海交通大学振动,冲击,噪声国家重点实验室,上海200240

出　　处：《船舶力学》2007年第6期953-960,共8页Journal of Ship Mechanics

基　　金：Supported by University Philosophy Doctoral Station Scientific Research Foundation(Grant No. 20040248011)

摘　　要：本文采用二次建模方法,对具有微观结构的粘弹性材料的声辐射问题进行了研究。第一次建模时针对包含单个内部结构的周期细胞进行精确的建模,根据有限元计算结果获得粘弹性阻尼层等效成正交各向异性材料的等效物性参数;第二次建模时,该粘弹性阻尼层可简单地用具有该等效物性参数的均匀材料替代。二次建模计算所划分网格的尺度较大,可选择的单元类型也更多。在作该材料的低频受激振动声辐射预报时,上述特点能够在保证计算精度的前提下,大幅度地降低计算成本,缩短计算时间。A twice modeling method in underwater sound radiation prediction for viscoelastic materials with inner voids under stimulation is developed.During the first modeling process, FEM method is adopted to get the strain and stress of elements in a single periodical cell, all these results can deduce the equivalent material properties of orthotropic material. Subsequently, the damping layers coated on the shell of the structure can be replaced by a homogeneous material with equivalent parameters. In the second modeling process, more various element types are chosen and larger element size is adopted.These merits may ensure a more precise sound radiation prediction level with less analysis time or cost in lower frequency band.

关 键 词：粘弹性阻尼材料 正交各向异性 辐射噪声 

分 类 号：O343.8[理学—固体力学]