Pfretszchner, J., Cobo, P., Cuesta, M., Fernández, A., and Schmitt, A.
Acta Acustica united with ACUSTICA, 91 (Supp. 1), S130
In Internoise 2004 we reported the new concept of Microperforated Insertion Units, MIU, introducing their innovative acoustic and mechanical performances as an alternative to the traditional Microperforated Panel Absorbers, MPP. Theoretical and experimental results were compared in an impedance tube with diameters of 3 and 10 mm. In this work, we consider the angular dependence of the absorption coefficient of a large MIU panel (2.4 x 2.4 m2) in free field. Both theoretical and experimental results are presented, showing the acoustic absorptive capabilities of the device.
