Noticias

The highest sound absorption coefficient of ordinary Chalco Aluminum closed cell  aluminum foam plate is not higher than 0.7, and the sound absorption coefficient of aluminum in the low-frequency area below 400HZ is less than 0.2, so the overall sound absorption coefficient is not high.The sound absorption of closed cell  aluminum foam plate mainly depends on three ways: first, helmholtz resonator, second, crack and micropore sound absorption, third, diffuse reflection sound absorption closed cell  aluminum foam plate after cutting surface can form some half hole, namely the helmholtz resonator, the sound waves reach the surface will be part of the material into the hole, the resonant absorption, material is internal cracks and microporous structure, by air, because the viscosity of the air to produce viscous resistance in the cracks and pores, the vibration of air kinetic energy into heat energy dissipation.



After perforating the closed cell  aluminum foam plate material, a series of parallel helmholtz resonators are formed. Due to the generation of a large number of resonators, the sound absorption capacity of the closed cell  aluminum foam plate is significantly improved.
closed cell  aluminum foam plate sound absorption board is made of road and railway sound insulation screen, subway tunnel noise reduction lining, subway station noise reduction lining, tunnel vent noise reduction lining, railway tunnel noise reduction lining, highway tunnel noise reduction lining, cross-river tunnel noise reduction lining and so on.