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大自然环境中,只要有人群的地方就有噪声。从生理学观点讲,凡使人烦恼或讨厌的声音都可称为噪声,从物理学观点讲,噪声是各种不同频率和声强的声音,呈无规律的杂乱组合。噪声可分为稳态噪声和脉冲噪声两种。稳态噪声可为连续的、间断或起伏的、伴有声级变化大的特点。高强度的稳态噪声常见于运输车辆、卡车驾驶台、各种机械木工发动机修理车间、飞机发动机,舰艇机舱以及坦克驾驶台所发出的声音。公共汽车噪声约80 dB(分贝),车速提高一倍可增加6～10 dB。目前我国的大城市人口密集、交
In a natural environment, there is noise as long as there is a crowd. From the physiological point of view, any annoying or annoying sound can be called noise, from a physical point of view, the noise is a variety of different frequencies and sound intensity of the sound, showed a random messy combination. Noise can be divided into two kinds of steady-state noise and impulse noise. Steady-state noise can be continuous, discontinuous or undulating, with large variations in sound level. High-intensity, steady-state noise is commonly found in the transport vehicles, truck drivers’ cabs, various mechanized woodworking engine repair shops, aircraft engines, naval vessels, and tank cabins. Bus noise about 80 dB (decibels), double the speed can increase 6 ~ 10 dB. At present, the big cities in our country are densely populated and pay