基于有限元法的Alberich型覆盖层吸声特性研究

Study of the absorption characteristics of Alberich anechoic coating based on the finite element method

基于有限元法研究了附在钢板上并以空气为背衬的Alberich型覆盖层的吸声特性。通过采用无反射流体吸声边界,可以较少的单元很好地模拟无限声学流场。并针对混合型空腔结构进行了吸声特性的分析,有限元分析结果表明,该空腔结构的吸声特性明显优于相同穿孔率的单腔结构。

Based on the finite element method,the absorption characteristics of the Alberich anechoic coating, which is adhered to the surface of steel plate and the back of the steel plate is exposed in the air, are studied. By using the nonreflecting boundaries, an infinite acoustic flow field could be well simulated with fewer units.A kind of cavity structure, a large cavity surrounded by some small cavities, was proposed. The finite element results show that absorption characteristics of this kind of cavity structure are superior to single-cavity structure with the same perforation rate.