The porous sound-absorbing material is a sound-absorbing material having a large number of interpenetrating micropores from the surface to the inside. When acoustic waves are incident on the surface of the porous material, the vibration of the air in the micropores is stimulated, and relative motion between the air and the solid tendon is generated. The viscous pores in the air generate corresponding viscous resistance, 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 occurs between the air and the pore wall, due to the effect of heat conduction. It will also convert sound energy into heat energy and absorb sound.
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