Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


C. Droz

Prace konferencyjne
1.  Ahsani S., Boukadia R.F., Droz C., Zieliński T.G., Jankowski Ł., Claeys C., Desmet W., Deckers E., On the potential of meta-poro-elastic systems with small mass inclusions to achieve broad band a near-perfect absorption coefficient, ISMA2020 / USD2020, International Conference on Noise and Vibration Engineering / International Conference on Uncertainty in Structural Dynamics, 2020-09-07/09-09, Leuven (BE), pp.2463-2472, 2020

This paper discusses the potential of meta-poro-elastic systems with small mass inclusions to create broadband sound absorption performance under the quarter-wavelength limit. A first feasibility study is done to evaluate whether embedding small mass inclusions in specific types of foam can lead to near-perfect absorption at tuned frequencies. This paper includes an optimization routine to find the material properties that maximize the losses due to the mass inclusion such that a near-perfect/perfect absorption coefficient can be achieved at specified frequencies. The near-perfect absorption is due to the mass-spring effect, which leads to an increase in the viscous loss. Therefore, it is efficient in the viscous regime. The well-known critical frequency, which depends on the porosity and flow resistivity of the material, is commonly used as a criteria to distinguish the viscous regime from the inertial regime. However, for the types of foam of interest to this work, the value of critical frequency is below the mass-spring resonance frequency. Hence, the inverse quality factor is used to provides a more accurate estimation on the frequency at which the transition from the viscous regime to the inertial regime.

Afiliacje autorów:
Ahsani S. - Katholieke Universiteit Leuven (BE)
Boukadia R.F. - inna afiliacja
Droz C. - inna afiliacja
Zieliński T.G. - IPPT PAN
Jankowski Ł. - IPPT PAN
Claeys C. - Katholieke Universiteit Leuven (BE)
Desmet W. - Katholieke Universiteit Leuven (BE)
Deckers E. - Katholieke Universiteit Leuven (BE)

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