With the application of sound absorbing material in large-scale engineering, people have a vague understanding of the principle of Sound Absorptive Tiles, so it has produced some mistaken understanding of the sound absorbing material.
Sound absorbing board Knowledge: fiber porous Sound Absorptive Tiles board materials, such as glass wool, rock wool, mineral wool, polyester fiber Sound Absorptive Tiles board, Sound Absorptive Tiles mechanism is the material inside a large number of tiny connected pores, sound waves along these pores can be in-depth material inside, and the friction with the material will be converted into heat energy. The Sound Absorptive Tiles characteristic of porous sound absorbing material is increasing with the increasing of frequency, which means that low-frequency absorption is not good for high-frequency absorption. Porous materials to absorb the sound requirements are: the material has a large number of voids, the gap between the connectivity, pore depth inside the material.
With the wall or smallpox in the air layer perforated plate, even if the material itself Sound Absorptive Tiles performance is very poor, this structure also has Sound Absorptive Tiles performance, such as perforated gypsum board, plank, metal plate, and even slit-like sound-absorbing bricks. This type of Sound Absorptive Tiles is known as Helmholtz resonant sound, the Sound Absorptive Tiles principle is similar to the acoustic resonance of a Thermos bottle, in which the external space of the material is connected with the internal cavity through a narrow bottleneck, and when the sound wave is incident, the resonant frequency of the neck between the air and the interior space produces a sound energy loss. The characteristic of Helmholtz resonance absorption is that it has a large Sound Absorptive Tiles coefficient only at resonant frequencies. Thin film or thin plate and wall or ceiling of the existence of cavities can also absorb sound, such as wood, metal plate made of ceiling or wall panels, such structure of the Sound Absorptive Tiles mechanism is the thin plate resonance absorption. In the resonant frequency, a large amount of sound energy is absorbed due to the intense vibration of the thin plate. Most of the thin plate resonance absorption has better Sound Absorptive Tiles performance in low frequency.