Long-wave noise problem: The Institute of Environmental Pollution Control Technology of Zhejiang University is testing and analyzing the noise sources of supporting equipment with acoustic instruments in typical residential areas in Hangzhou.
The noise sources such as combustion chamber, gas stove, power supply system, underground garage, heating system, water supply and drainage system and air conditioning equipment are selected. The results show that among the typical noise sources of 12, the longest wave band is the largest, and the long-wave noise has a strong penetrating power, so the long-wave noise has become the noise source that has the greatest impact on residential areas.
Governance methods:
Long-wave noise sources in cities mainly include water heaters, gas stoves, sound boxes, central air conditioners (including cooling towers) and traffic noise. Long-wave noise has the longest sound wave, so long-wave noise has a strong penetrating power to buildings, and its "penetrating power" will bring "internal injuries" to listeners. This kind of sound is so loud that it is illegal according to the testing standard.
The control of long-wave noise is one of the recognized problems in the field of noise control. Generally speaking, there are three ways to control noise, including controlling noise sources, protecting communicators and cutting off transmission channels.
For example, installing a soundproof window is a way to protect the transmitted person, which can also be understood as cutting off the transmission route. Another more active method is to control from the noise source. Such as spraying water-based damping paint on the combustion chamber.
Refer to the above? Baidu encyclopedia-low frequency noise