RT Journal Article
SR Electronic
A1 Schweighardt, Attila
A1 Vehovszky, Balázs
A1 Feszty, Dániel
T1 Airflow Resistivity Measurements of Acoustic Poroelastic Materials and their Influencing Factors
JF Manufacturing Technology Journal
YR 2025
VO 25
IS 5
SP 678
OP 688
DO 10.21062/mft.2025.075
UL https://journalmt.com/artkey/mft-202505-0015.php
AB In the automotive sector, poroelastic materials (PEMs) are used as trim elements to achieve the desired interior acoustics of a vehicle. This study examines the effect of manufacturing as well as measurement techniques on airflow resistivity. This property plays a key role in the acoustic behavior of PEMs. First, the importance of engineering acoustics and poroelastic materials in vehicle industry is reviewed, followed by the introduction of the most important properties and their measurement techniques. Next, the theory and the measurement techniques used to determine resistivity via direct method are detailed. Then the factors influencing the results and their quantified effects are presented. More than 10 influencing factors are identified and examined, from which the inhomogeneity, resulting from the production technology proved to be the most significant. The results obtained with direct and inverse methods are compared for validation purposes and to determine the achievable accuracy of the inverse method. The average difference between the two methods is 4.54%, which means that the inverse method can provide a good approximation. Finally, conclusions are drawn and suggestions are made for the future.