What are the methods of low noise? Xiaobian summarizes three treatment methods, namely, sounding, sound insulation treatment, and sound absorption treatment. Lets take a look together:
I. Vocalization: The sound of the fire firing fans is to fix the porous sound absorption material in the inner wall of the air flow channel, or fix it in the pipeline in a certain way to reach the purpose of weakening the air dynamic noise.To fifty decibels.
Second, sound insulation treatment: The method of selecting sound insulation is to turn the noise source and use the sound insulation cover to control the noise in the small area.When the sound wave encounters a shield, due to the changes of the interface characteristic impedance, part of the incident sound energy is reflected, part of it is absorbed, and part of the sound can be transmitted through the shield.The sound insulation function of the material can be indicated by the sound transplantation coefficient.The smaller the sound transparent coefficient, the less sound can be marked, the better the sound insulation function of the material.
Third, sound absorption: The sound absorption mechanism of porous sound absorption materials is: there are many slender pores that penetrate each other inside the material. When the sound waves are incorporated into the surface of these materials, and then incident into these slender pores, it must cause inside the pores to cause the pores.The air movement is close to the air on the wall and the fiber surface. It is not easy to move due to conflict and stagnation resistance, so that the sound energy can be converted into thermal energy and consumes it.Therefore, the functional sound -absorbing materials must be pores, and the holes and holes penetrate each other, and the pores that penetrate through are connected to the outside world, so that sound waves can enter the inside of the material.