The comprehensive noise reduction coefficient of the new foam aluminum material reaches 0.75, and the sound absorption coefficient of the 250~1000Hz mid-range frequency reaches above 0.9, which far exceeds the commonly used sound-absorbing materials such as rock wool, gypsum board, and perforated metal plate. Its comprehensive sound insulation and noise reduction ability is polyurethane foam. It is 7-10 times that of plastic, glass fiber and aluminum honeycomb. It is used in high-speed trains and car box panels, and its sound insulation is close to 30dB. New foam aluminum materials are used in more and more fields with their superior sound absorption and noise reduction and related properties, mainly in highway sound barriers, road tunnel noise reduction, subsea tunnel noise reduction, tunnel vents; sound absorption in swimming pools Wall; foam aluminum new materials make sound-absorbing linings for buildings, such as recording studios, dubbing rooms, concert halls, conference halls, stadiums, etc.
The main influencing factors of the sound absorption and noise reduction effect of the new foam aluminum material are as follows:
1. The new foam aluminum material is a porous material, and its sound absorption performance is more obvious for high-frequency sounds, that is to say, the sound absorption coefficient is large in the high-frequency region. The sound absorption effect for low-frequency sounds is not ideal, so the sound absorption coefficient in the low-frequency region is small;
2. The thickness of the sound-absorbing board made of the new foam aluminum material is different, and the sound absorption rate is different. With the increase of the thickness, the excellent frequency of sound absorption will develop in the direction of absorbing low frequency. However, when the frequency of the sound is greater than 500 Hz, the sound absorption coefficient of the new foam aluminum material has nothing to do with the thickness;
3. When the density of the new foamed aluminum material increases, the excellent sound absorption rate at this time will also develop towards low-frequency sound, and the pore size of the new foamed aluminum material and how many have obvious differences in the sound absorption performance of the sound-absorbing board.
To put it simply, the choice of new foam aluminum materials is different, such as thickness, density, pores, etc., and the sound absorption effect reflected will be different. No matter how the new foam aluminum material is selected, it is more effective to fit its own situation.