Sage Journals: Discover world-class research

Abstract

A general way to enhance the sound absorption capability of cellular plastic foam is the use of corrugated foam. The corrugated surface can greatly enhance the sound absorption of the foam in the mid and high frequency ranges. In this study, a finite element frequency domain acoustic analysis is used for the analysis. Such a numerical method is more efficient than the methods used in earlier studies as it saves the calculation time on the elements of the incident acoustic field. During the optimal design of the corrugated cellular plastic foam with semi-elliptical shaped upper surface, the cross-sectional width (the length of the minor axis) and the area of one section of the corrugated foam are kept the same throughout the study. The variation of the semi-elliptical shape is performed by changing the length of the semi-major axis. By varying the length of the semi-major axis, the maximum sound absorption capability of the semi-elliptical shaped corrugated foam is found. It is concluded that in the high frequency region (2000—4000 Hz), the foam with the major axis to the cross-sectional width ratio (MWR) of 1.96 has the maximum sound absorption capability and its broadband averaged normal incidence sound absorption coefficient is improved from 0.882 to 0.945.

Keywords

corrugated foam semi-elliptical shape sound absorption coefficient finite element method frequency domain.

Get full access to this article

View all access options for this article.

References

Voronina, N. (1997). An Empirical Model for Rigid Frame Porous Materials with High Porosity, Applied Acoustics , 51(2): 181—198.

Biot, M.A. (1956). Theory of Propagation of Elastic Waves in a Fluid-saturated Porous Solid I. Low-frequency Range, II: Higher Frequency Range, Journal of the Acoustical Society America, 28(2): 168—191.

Craggs, A. (1978). A Finite Element Model for Rigid Porous Absorbing Materials, Journal of Sound and Vibration, 61(1): 101—111.

Craggs, A. (1979). Coupling of Finite Element Acoustic Absorption Models, Journal of Sound and Vibration, 66(4): 605—613.

Easwaran, V. and Munjal, M.L. (1993). Finite Element Analysis of Wedges Used in Anechoic Chambers, Journal of Sound and Vibration, 160(2): 333—350.

Chen, W.-H. , Lee, F.-C. and Chiang, D.-M. (2000). On the Acoustic Absorption of Porous Materials with Different Surface Shapes and Perforated Plates, Journal of Sound and Vibration, 237(2): 337—355.

Kang, Y.J. and Bolton, J.S. (1996). Optimal Design of Acoustical Foam Treatments, Journal of Vibration and Acoustics, 118: 498—504.

Tsay, H.-S. and Yeh, F.-H. (2005). Frequency Response Function for Prediction of Planar Cellular Plastic Foam Acoustic Behavior, Journal of Cellular Plastics, 41(2): 101—131.

Tsay, H.-S. and Yeh, F.-H. (2006). Finite Element Frequency-Domain Acoustic Analysis of Open-cell Plastic Foams, Finite Elements in Analysis and Design, 42(4): 314—339.

10.

Tsay, H.-S. (2006). Three-dimensional Finite Element Frequency Domain Acoustic Analysis of Open Cell Plastics Foams, Journal of Cellular Plastics, 42(6): 487—515.

11.

Tsay, H.-S. and Yeh, F.-H. (2006). The Influence of Circumferential Edge Constraint on the Acoustical Properties of Open-cell Polyurethane Foam Samples, Journal of the Acoustical Society of America, 119(5): 2804—2814.

Optimal Design of Corrugated Cellular Plastic Foam with Semi-elliptical Shaped Upper Surface by Finite Element Frequency Domain Acoustic Analysis

Abstract

Keywords

Get full access to this article

References