What are the common misunderstandings in noise control projects
Author：Trlon Views: Time:2020-10-12
Many people do not understand the basic principles of the construction control and treatment of the cooling tower noise control project. They just add something at the source of the noise at will, but the noise has not changed at all. Some are likely to become more and more uncomfortable. This is the common drawback in noise control. What are the common drawbacks in the construction of noise control projects? Next, trlon editor will give you a brief introdction.
Problem one of noise control project:
Misunderstanding that the uneven surface layer will have sound absorption effect. In some early living rooms, cement calendered indoor decoration methods were often used on the walls. It is felt that this kind of uneven surface layer structure has the effect of adsorbing noise. There are actually two types of sound absorption methods, namely porous structure sound absorption and resonance sound absorption. The sound absorption of porous structure requires connecting holes in the material, and the sound absorption requires cavities, and the structure similar to cement calendering has neither connecting holes nor connecting holes. There is no cavity, so most of them have no adsorption effect on the sound. This point should be focused on when carrying out noise control.
Noise control project problem two:
Misunderstanding that if it is a hard bag, it will have excellent sound absorption characteristics. In some engineering decoration, the frequently used structure is the base material (mostly blockboard or solid wood multilayer board) with a layer of 2 to 3 mm thick. Composite hard covered textile. This type of interior decoration method has simple construction and good decoration style, so it is widely used. However, it is a mistake to assume that this type of structure has excellent sound absorption because the surface layer is hard-covered textile. Because the sound-absorbing properties of porous structured sound-absorbing materials are closely related to the thickness of the material, assuming that the material is too thin, it cannot play an effective sound-absorbing effect.
Generally speaking, it is assumed that the sound-absorbing effect of the comparison target is to be achieved, and the thickness of the sound-absorbing material must be at least 10mm, otherwise it cannot be used as a sound-absorbing structure. Of course, the sound absorption effect of the structure can be enhanced according to the way the cavity is set on the back of the porous structure. Generally speaking, it is assumed that to achieve the target sound absorption effect, the thickness of the sound-absorbing material must be at least 10mm, otherwise it cannot be used as a sound-absorbing structure.
Of course, the sound absorption effect of the structure can be enhanced by setting the cavity on the back of the porous structure. The method is to have a certain cavity away from the wall when installing the board. The thickness of the cavity should exceed 30mm, and the substrate should not be too thick. It is better to use five plywood or nine centimetre board, and open holes or gaps of a certain area in the substrate. If you want to enhance low-frequency sound absorption, you can use micro-perforated sound-absorbing materials. If you want to enhance mid- and high-frequency sound absorption, you need to open a relatively large hole, the porosity should exceed 30%, and the diameter should exceed 20mm. This kind of method strengthens the sound absorption effect of the structure without changing the decoration style.
The above content is a brief introduction to the more common problems in noise control projects. Although noise control is technically perfect, it is necessary to adopt noise control because of the large scale of modern industrialization and transportation. There are many enterprises and venues, so in order to avoid noise problems, it is necessary to carry out a comprehensive measurement from the aspects of technology, economy and function. Of course, actual problems should be analyzed in detail. In areas where you are manipulating outdoors, design rooms, production workshops, or long-term work for employees, the intensity of noise should be low; in warehouses or with fewer people going to production workshops or wide areas, higher noise levels are fine. All in all, there needs to be a certain difference in the face of noise at different times, places, properties, and delay times.