When the sound wave is incident to the surface portion of the sound, it can be absorbed by the object transforming into other forms of energy, known as the sound absorbing. The sound absorbing properties of the material can be represented by absorption coefficient, the greater the sound absorption coefficient, the better the sound absorption performance of the material. The nature of the sound absorption properties of the material is relative to the material structure, the angle of incidence of the sound wave and the frequency of the acoustic wave. The mechanism of porous sound-absorbing material is as this: the material interior has inter-connected holes and the sound entering the small pore causes air movement within the pore. Due to friction and viscous resistance, the air close to wall and the fiber surface does not move easily, thus sound energy is transformed into heat energy. Therefore, the good performance of sound-absorbing material should be porous, and the interior holes shall be inner connected. Also the holes shall be connected to the outside world so that the sound waves can enter the material.
Noise control products: composite acoustic panels and efficient insulation board, multi-functional shock pad
Demonstration projects:The blower noise control engineering for Dongyi Thermal Power Hi-Tech Heating Co., Ltd.,