Investigation of influence of defects of sound absorption structures on their acoustic efficiency

摘要

For this work, experimental studies of the influence of technological defects on the acoustic efficiency of sound-absorbing structures (SAS) were carried out. Two types of defects were investigated: the diameter of the perforation and the delamination at the boundary of the honeycomb core and the non-perforated and perforated power shell. A series of laboratory experiments was performed to evaluate the acoustic efficiency of SAS cells with different diameters and different stratification schemes on an interferometer with a normal sound wave drop. Based on the results of the studies, the dependences of the natural frequency of the resonator and the coefficient of loss of acoustic pressure on the diameter of the perforation and on the stratification scheme were revealed.