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FEA for damping of structures having elastic bodies, viscoelastic bodies, porous media and gas

机译:FEA用于阻尼具有弹性体,粘弹性体,多孔介质和气体的结构

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摘要

A numerical method is proposed to calculate damping properties for soundproof structures involving solid bodies, porous media and air in two-dimensional regions. Both effective density and bulk modulus have complex quantity to represent damped sound fields in the porous media. Particle displacements in the media are discretized using finite element method. For damped solid bodies, displacements are formulated using conventional finite elements including complex modulus of elasticity. Displacement vectors as common unknown variables are solved under coupled condition between solid bodies, porous media and gas. Further, by applying asymptotic method to complex eigenvalue problem, explicit expressions of modal loss factor for the mixed structures are derived. The proposed methods yield appropriate results for some typical problems and this method diminish computational time for large-scaled finite element models concerning the mixed structure. Moreover, it is found that damping can be coupled in the mixed structures between solid bodies, porous media and air.
机译:提出了一种数值方法来计算二维区域内涉及固体,多孔介质和空气的隔音结构的阻尼特性。有效密度和体积模量都具有复杂的量,以表示多孔介质中的阻尼声场。使用有限元方法离散化介质中的粒子位移。对于阻尼固体,使用包括有限弹性模量在内的常规有限元来确定位移。在固体,多孔介质和气体之间的耦合条件下求解位移向量作为常见的未知变量。此外,通过将渐近方法应用于复杂特征值问题,导出了混合结构模态损耗因子的显式。所提出的方法对于一些典型问题产生了适当的结果,并且该方法减少了有关混合结构的大型有限元模型的计算时间。此外,发现阻尼可以在固体,多孔介质和空气之间的混合结构中耦合。

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