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Hybrid experimental/numerical technique for determination of the complex dynamic moduli of elastic porous materials

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Abstract

Polyurethane (PU) and other plastic foams are widely used as passive acoustic absorbers. For optimal design, it is often necessary to know the viscoelastic properties of these materials in the frequency range relevant to their application. An experimental/numerical technique has been implemented to determine the Young and shear dynamic moduli and loss factor of poroelastic materials under low-frequency 40–520Hz random excitation. The method consists of measuring the dynamic response of the sample at its surface, and matching the response with the predictions from a finite element model in which the two complex elastic moduli are the adjustable parameters. Results are presented for measurements made in air, under standard pressure and temperature conditions, and compared with predictions based on Okuno’s model. The dependence of elastic moduli on the dimension of the sample and its boundary conditions is also studied.

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Authors and Affiliations

  1. Institute of Advanced Machinery and Design, School of Mechanical and Aerospace Engineering, Seoul National University, Gwanak-ro 599, Gwanak-gu, Seoul, 151-744, Korea

    Amir Hamza & Yeon June Kang

Authors
  1. Amir Hamza
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  2. Yeon June Kang
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Correspondence to Yeon June Kang.

Additional information

This paper was recommended for publication in revised form by Associate Editor Hong Hee Yoo

Professor Yeon June Kang received his B.S. and M.S. degrees in Mechanical Design and Production Engineering from Seoul National University in 1988 and 1990, respectively. He then went on to receive a Ph.D. degree in Acoustics and Vibra-tion from School of Mechanical Engineering, Purdue University in 1994. After his Ph.D., he continued to work as a Postdoctoral Research Associate at Ray W. Herrick Laboratories, Purdue University until 1996. Since 1997, Dr. Kang is working at the Department of Mechanical and Aerospace Engineering, Seoul National University. Dr. Kang’s research interests are in the area of acoustical materials, noise and vibration in automotive engineering, and Korean Bells.

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Hamza, A., Kang, Y.J. Hybrid experimental/numerical technique for determination of the complex dynamic moduli of elastic porous materials. J Mech Sci Technol 23, 283–290 (2009). https://doi.org/10.1007/s12206-008-0715-z

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  • DOI: https://doi.org/10.1007/s12206-008-0715-z

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