无界流场中充流弹性壳体声透射数值研究

Numerical Investigation on Sound Transmission Through Submerged Fluid-Filled Elastic Shell

利用耦合有限元与边界元方法计算了声波激励下浸没在无界流场中内部充满流体的弹性薄壳声透射 .在有限元方法和边界元法中均采用了八结点曲面四边形等参单元 .耦合方程是以声场变量表达 .为验证数学模型的正确性 ,对点声源激励下无界水域中充气球壳进行了数值计算 .结果表明 ,壳体内外表面声压数值计算结果与解析解相当吻合 .

Sound transmission through submerged,fluid filled elastic thin shell excited by incidentacoustic waves in the interior domain was calculated using the coupled FEM and BEM method.Eight- nodded curvi- linear quadrilateral isoparametric shell element is used both in the FEM and in the BEM.The resulting coupled equation system was expressed in terms of acoustic variables.To validate the scheme,an air- filled,submerged in water spherical shell excited by a sound source located at the center of the sphere was calculated.Comparison of the calculated surface pressures with the corresponding analytical solutions shows that they are in good agreement.