The principle of sound insulation: sound insulation is the most widely used method of noise control engineering, and the simplest method. To put it mildly, an alarm clock is stuck in a vacuum cover without air, and nothing can be heard outside. Note: One thing is that this alarm clock must be suspended in the air without any vibration being transmitted to any contact. Therefore, the actual sound insulation should be divided into two categories. That is, solid sound and air sound. The former is because the vibration propagates along the solid mechanism, and the latter is transmitted to the outside through the air or reflected back. How to prevent or reduce this kind of propagation, the method of isolating the sound propagation is called sound insulation treatment.

Calculation of sound insulation: The sound insulation ability depends on the surface density of the sound insulation member, that is, the weight per unit area m2. The higher the density, the greater the inertial resistance, and the less the vibration is, the better the sound insulation effect is. Do "quality law"

The singing voice of the air sound: When the sound wave touches the wall during the propagation process or the structure is set by the method of sound insulation wall, cover and screen. Some of them are absorbed, and some of them are transmitted through the structure. To test the sound insulation of the structure, a quantity called the sound transmission coefficient is included, which is equal to the ratio of the transmitted sound energy W to the incident sound energy. .

There are several reasons for affecting the sound insulation effect: there is a gap between the theoretical sound insulation of a component and the actual sound insulation. There will be no one hundred percent. The sound insulation effect will be affected by the following reasons: the frequency of the incident sound wave and the quality of the sound insulation member. , damping layer, sound absorbing material, hole leakage sound, sound bridge

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May 18, 2024