Characterization of a nonlinear sound absorber at low frequencies and high sound levels

International audienceTo characterize nonlinear acoustic loads identification techniques have been developed. A specific setup of impedance tube named “Short Kundt’s Tube” (SKT) was built to reach high sound levels at low frequencies. Two approaches, developed in the frequency domain,are discussed: a linearization method giving access to the acoustic impedance and a nonlinear model which is able to characterize energy transfer to higher harmonics. Both are excitation level dependent