噪声是一种不悦耳的、扰乱听觉和破坏安静的声音。从物理意义上来讲,噪声是由许多彼此交替着的复杂声波的杂乱组合。它的波形与音乐相比是无规则的非周期性曲线。噪声对人除了会引起听力损伤和智力衰退外,还会引起高血压、心率紊乱、神经衰弱等疾病。在高噪声环境下工作,使人烦躁和反应迟钝,降低工作效率。噪声还会掩蔽危险信号和指挥信号,增加工伤事故。随着工业和交通运输业的迅速发展,高速、大马力机器日益增多,噪声已成为危害人民健康和污染环境的重要因素,是城市三大公害之一,许多国家都已公布了限制噪声的法规。为了降低机器的噪声,一些先进的工业国家从六十年代初开始,相继开展了多方面的研究,并已取得 Noise is a kind of unpleasant, disruptive hearing and disrupt the quiet voice. In a physical sense, noise is a messy combination of many complex acoustic waves that alternate with each other. Its waveform is a random non-periodic curve compared with music. In addition to noise can cause hearing loss and mental decline, but also cause high blood pressure, heart rate disorders, neurasthenia and other diseases. Work in a noisy environment, annoying and unresponsive, reducing work efficiency. Noise also masks dangerous signals and command signals, increasing accidents at work. With the rapid development of industry and transportation, high-speed and high-horsepower machines are increasing day by day. Noise has become an important factor that endangers the health of the people and pollutes the environment. It is one of the three major public hazards in the city. Many countries have promulgated noise-restricting laws . In order to reduce machine noise, some advanced industrial countries have conducted various studies in succession since the early 1960s and have obtained