A study of characterization on polyester fibrous panels and their homogeneity assessment

Tao Yang (1) , Ferina Saati (2) , Jean-Philippe Groby (3) , Xiaoman Xiong (1) , Michal Petrů (1) , Rajesh Mishra (1) , Jiří Militký (1) , Steffen Marburg (2)

1 Technical University of Liberec
2 TUM - Technische Universität Munchen - Technical University Munich - Université Technique de Munich
3 LAUM - Laboratoire d'Acoustique de l'Université du Mans

Nowadays, fibrous polyester materials are becoming one of the most important alternatives for controlling reverberation time by absorbing unwanted sound energy in the automobile and construction fields. Thus, it is worthy and meaningful to characterize their acoustic behavior. To do so, non-acoustic parameters, such as tortuosity, viscous and thermal characteristic lengths and thermal permeability, must be determined. Representative panels of polyester fibrous material manufactured by perpendicular laying technology are thus tested via the Bayesian reconstruction procedure. The estimated porosity and airflow resistivity are found in good agreement with those tested via direct measurements. In addition, the homogeneity of polyester fibrous panels was characterized by investigating the mean relative differences of inferred non-acoustic parameters from the direct and reverse orientation measurements. Some parameters, such as tortuosity, porosity and airflow resistivity, exhibit very low relative differences. It is found that most of the panels can be assumed homogeneous along with the panel thickness, the slight inhomogeneity mostly affecting the thermal characteristic length.

Mots clés: Characterization; bayesian reconstruction; homogeneity; porous materials; polyester fibrous materials

Domaines: Acoustique [physics.class-ph]

Tao Yang, Ferina Saati, Jean-Philippe Groby, Xiaoman Xiong, Michal Petrů, et al.. A study of characterization on polyester fibrous panels and their homogeneity assessment. Polymers, 2020, 12 (9), pp.2098. ⟨10.3390/polym12092098⟩. ⟨hal-03084704⟩