For large aperture perforation plate

reducing acoustic mass is a way to realize broadband sound absorption.Meanwhile

the acoustic resistance can be enlarged due to the grazing flow effect as well as the reduction of the acoustic mass.Based on above results

the designing principle was proposed for the parameters of the perforation plate.Besides this

the perforated plate muffler experiment was also conducted.The experimental results show that broadband sound absorption can be achieved for large aperture perforation plate with low acoustic mass in the presence of grazing flow when compared with that of perforated lining without grazing flow.Such perforation plate can be applied to the noise reduction of the aircraft engine nacelle

inlet and exhaust pipe of motor engine

and all kinds of ventilation pipe with large air flow.