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Abstract

A numerical method using an impulsive excitation to excite and obtain the acoustic frequency response functions of isotropic open cell plastic foams is presented. The proposed three-dimensional finite element frequency domain acoustic analysis (3D FEFDAA) is first used to validate the acoustic properties of infinite planar and rigidly backed open cell plastic foam. Thereafter, the influences of fixed edge constraints and the width-to-thickness ratio on the acoustic properties of planar foam with finite width and length are examined. Furthermore, the use of 3D FEFDAA to predict the acoustic properties of the air layer and the pyramid foam is demonstrated. Without the use of the incident acoustic field that is required in the earlier studies, results predicted in the present study are shown to agree with the exact solutions.

Keywords

open cell plastic foam three-dimensional finite element method frequency domain dynamic stiffness acoustic behavior

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Three-dimensional Finite Element Frequency Domain Acoustic Analysis of Open Cell Plastics Foams

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