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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/65308


    Title: Finite Element Frequency-domain Acoustic Analysis of Open-Cell Plastic Foams
    Authors: Tsay, H.-S.;Yeh, F.-H.
    Contributors: 淡江大學機械與機電工程學系
    Keywords: Corrugated open-cell plastic foam;Biot;Laplace transform;Finite element method;Dynamic stiffness;Acoustic response
    Date: 2006-01-01
    Issue Date: 2011-10-20 21:38:57 (UTC+8)
    Abstract: A numerical method using an impulsive excitation to excite and collect the acoustic frequency response functions of corrugated open-cell plastic foams is presented in this study. In the study, the Biot's poroelasticity equations are first phrased in terms of solid and fluid displacements and then transformed into the Laplace domain. With the use of the general quadrilateral or triangular elements, the stiffness matrixes for the foams in the Laplace domain are then derived by the Galerkin-type finite element method. After solving and obtaining the dynamic stiffness transfer functions for the foams that are excited by an impulsive pressure on their upper surface, the Laplace transformed stiffness transfer functions are then transformed into frequency domain called dynamic stiffness functions, which can be further used in calculating the acoustic properties of foams. For validations, the proposed Laplace transformed finite element method (LTFEM) is first used to predict the acoustic properties of a planar and rigidly backed open-cell plastic foam with infinite width and permeable upper surface. Thereafter, the influences of the thickness, the width-to-thickness ratio, and the roller as well as fixed side edge restraints on the planar foams’ acoustic properties are examined. Furthermore, the use of LTFEM to predict the acoustic properties of corrugated foams are demonstrated and discussed. Without the use of the additional acoustic field that is required in the earlier studies, results predicted in the present study are in good agreement with either the exact solutions or the experimental data.
    Relation: Finite Elements in Analysis and Design42(4), pp.314-339
    DOI: 10.1016/j.finel.2005.08.003
    Appears in Collections:[機械與機電工程學系暨研究所] 期刊論文

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