The porous sound absorbing material is a sound absorbing material having a large number of interpenetrating micropores from the surface to the inside. When the sound wave is incident on the surface of the porous material, the air vibration in the micropores is excited, and the relative motion between the air and the solid ribs is generated due to corresponding viscous resistance is generated in the viscous hole of the air, so that the kinetic energy of the vibrating air is continuously converted into heat energy, thereby attenuating the acoustic energy. In addition, when the air is adiabatically compressed, heat exchange between the air and the hole wall is continuously performed due to the heat conduction. It will also turn the sound energy into enthusiasm and absorb the sound.
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