噪声是城市环境污染的一个因素,它影响了人们正常生活、学习、工作,甚至对人们的身心健康产生严重威胁。工业生产中的机械机外噪声是最常见的噪音源,所以对此类噪声源的分析有助于我们对噪声进行有效控制,降低机械噪音污染。 Noise is a factor of urban environmental pollution, which affects people’s normal life, study and work, and even poses a serious threat to people’s physical and mental health. Mechanical out-of-machine noise in industrial production is the most common noise source, so analysis of such noise sources helps us to effectively control noise and reduce mechanical noise pollution.