论文部分内容阅读
一噪声的物理评价 1.声音与噪声人类生存的空间充满声音。声音是由于物体振动而产生的。例如,用鼓锤去敲鼓就会听到鼓声,手摸鼓面就会感到鼓面在振动,这是固体振动产生的声音;火车发出的气笛声是蒸汽通过气笛时振动的结果;海水的波浪声,就是液体振动的结果。振动的物体是声音的声源,振动在弹性介质(气体、固体、液体)中以波的方式进行传播,这个弹性波就叫做声波。一定频率范围的声波作用于入耳就产生了声音的感觉。频率是每秒钟振动的次
Physical evaluation of a noise 1. Sound and noise The space for human existence is full of sound. The sound is generated by the vibration of the object. For example, drumming drums will hear the drum sounds, and the drumheads will feel the drumheads vibrating. This is the sound generated by the solid vibrations. The gas whistle emitted by the train is the result of the vibration when the steam passes the gas flute Waves of sea water are the result of liquid vibrations. Vibrating objects are the sound source of sound. Vibrations propagate in a wave-like manner in elastic media (gas, solid, liquid). This elastic wave is called sound wave. A certain frequency range of sound waves in the ear produced a feeling of sound. The frequency is the number of vibrations per second