The impact of environmental noise on various industries and life
Under normal circumstances, we often refer to sounds that we do not want to hear as noise, such as environmental noise, traffic noise, etc. The sound of the piano is music, but it becomes disturbing noise to people who are studying or sleeping.
According to different sound sources, noise can be divided into mechanical noise, aerodynamic noise and electromagnetic noise. Mechanical noise is mainly caused 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 machine vibrate. Thereby radiating mechanical noise, such as the noise generated by machine tools, looms, ball mills, etc. When gases and gases, and gases and other objects (solid or liquid) are in high-speed relative motion, gas disturbance is caused by viscosity, which produces aerodynamic noise, such as the intake and exhaust noise of various types of fans, jet aircraft The noise generated by the roar, internal combustion engine exhaust, and gas storage tank exhaust is also a kind of aerodynamic noise caused by the rapid expansion of the surrounding air due to explosions. Electromagnetic noise is the noise caused by the vibration of electromagnetic components caused by magnetic field pulsation and magnetostriction, such as the noise generated by transformers.
Urban environmental noise occupies a very important position in noise research. It mainly comes from traffic noise, industrial noise, construction noise and social life noise. Due to the increasing number of motor vehicles in cities and the extensive use of supersonic aircraft, the noise generated by transportation vehicles (such as cars, tractors, trains, airplanes, etc.) has become one of the main sources of urban environmental noise pollution. Industrial noise not only directly harms production workers, but also affects nearby residents. Among the industrial noises, the noise of textile factories is 90~106dB, that of machinery industry is 80~120dB, large ball mills and large blowers are above 130dB. Industrial noise is the main cause of noise-induced deafness. Construction noise is caused by the use of various pile drivers, mixers, cutting machines and other construction machinery on construction sites. Noise is also common in social activities and domestic life. For example, excessive use of tweeters for promotional activities can produce annoying noise. In social life, improper use of radios, tape recorders, and televisions can in many cases become a source of noise that interferes with neighbors. Household appliances such as electric fans, refrigerators, and washing machines can also become noise sources if they are not properly designed and manufactured or used improperly.
