1, sound absorption:
Use sound-absorbing materials such as glass wool, foam plastic, slag wool, sound-insulating felt, asbestos wool, aerated concrete, wood wool board and sugarcane board to decorate the wall or ceiling. These porous materials can absorb sound waves and achieve the purpose of reducing noise intensity. Sound-absorbing materials mainly absorb reflected sound, and have little effect on the direct sound directly emitted by the sound source, and are more effective for high-frequency noise than low-frequency noise.
2, silencing:
Using muffler is the main measure to control aerodynamic noise. Muffler is a device that organizes sound propagation and allows airflow to pass through. Mainly used for air ducts and exhaust pipes. There are two kinds of mufflers in common use: resistive mufflers and reactive mufflers. The combination of the two has better noise elimination effect. A high-quality muffler should have large noise reduction, good aerodynamic performance and good structural performance, which are indispensable.
3. Sound insulation:
The equipment that produces noise or the place that needs to be quiet is enclosed in a small space to isolate it from the surrounding environment, so as to achieve the purpose of controlling the spread of noise. For example, in the sound insulation room of an air compressor station, the windows are made of double glass, the doors and windows are decorated with sound-absorbing materials, and the surrounding areas are sealed with rubber strip. A small sound source can use a soundproof cover.
Necessity of noise control in workshop
The noise in the production workshop is widely distributed in various industries and posts. In the Classified Catalogue of Occupational Hazards issued by the Ministry of Health in 2002, more than 60 types of jobs that may cause noise deafness were listed. Therefore, the key to reduce workshop noise is to take comprehensive control measures.
First of all, the factory should be rationally planned and laid out, and the factory that produces noise should have a certain distance from the residential area. It is best to set up a protective belt, plant green trees or set up a sound barrier in the protective belt.
Noise workshop and non-noise workshop, strong noise equipment and general equipment should be separated, and topographic features can also be used to reduce noise. For example, hills, slopes, buildings and trees (forests) are all good barriers, which can block or absorb some noise (db).