Noise pollution's effects on many industries and day-to-day life
In general, we often refer to unwanted sounds as noise, such as environmental noise, traffic noise, etc. The sound of the piano is music, but for those who are studying or sleeping, it becomes a disturbing noise.
According to different sound sources, noise can be divided into mechanical noise, aerodynamic noise, and electromagnetic noise. Mechanical noise is mainly generated by solid vibration. During mechanical operation, due to mechanical impact, friction, alternating mechanical stress, and uneven power during operation, the metal plates, gears, bearings, etc. of the machinery vibrate, thereby radiating mechanical noise, such as noise generated by machine tools, weaving machines, ball mills, etc. When gas and gas, as well as gas and other objects (solid or liquid) move in high-speed relative motion, gas disturbance caused by viscosity produces aerodynamic noise, such as various types of fan intake and exhaust noise, jet aircraft roar, internal combustion engine exhaust, and gas storage tank exhaust noise. Explosion causing rapid expansion of surrounding air is also an aerodynamic noise. Electromagnetic noise refers to the noise generated by electromagnetic components due to magnetic field pulsation and magnetostriction, such as the noise generated by transformers.
Urban environmental noise plays a very important role in noise research, mainly originating from traffic noise, industrial noise, construction noise, and social life noise. Due to the increasing number of motor vehicles and the widespread use of supersonic aircraft in cities, the noise generated by transportation vehicles (such as cars, tractors, trains, airplanes, etc.) has become one of the main pollution sources of urban environmental noise. Industrial noise not only directly harms production workers, but also affects nearby residents. In industrial noise, the noise from textile mills ranges from 90 to 106dB, while in the mechanical industry, it ranges from 80 to 120dB for large ball mills and blowers, exceeding 130dB. Industrial noise is the main cause of noise induced hearing loss. Construction noise is caused by the use of various construction machinery such as pile drivers, mixers, and cutting machines on construction sites. Social activities and family life noise are also common, such as excessive use of high pitched speakers for promotional activities, which can produce annoying noise. In social life, improper use of radios, tape recorders, and televisions can also become a source of noise that interferes with neighbors in many cases. Household appliances such as electric fans, refrigerators, and washing machines, if designed and manufactured improperly or used improperly, can also become noise sources.
