Partner: R.F. Boukadia

Conference papers
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.

Ahsani S.-Katholieke Universiteit Leuven (BE)
Boukadia R.F.-other affiliation
Droz C.-other affiliation
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)