城市居住区设备噪声频率特性分析

 在对杭州市噪声污染影响进行调查的基础上,选择典型的居住区配套设备噪声源进行分析,选取供电系统、地下车库、电梯设备、供热系统、排水供水系统、空调设备和通风系统中的12种典型噪声源,采用VS302USB双通道实时分析仪调试并记录以上设备正常运转状态的数字声信号.此外,通过声信号处理分析这些噪声源的频谱及低、中、高频段的能量比率.结果表明,各声源最大声压级所在频段以低频段最多(12种典型噪声中9种),最大能量分布频段也是以低频段最多(12种典型噪声中的7种),因而低频噪声已经成为居住区中影响最大的噪声源.

The analysis of noise frequency characters of facilities in urban residential area

On the basis of investigating the influence of noise pollution in Hangzhou City, the typical noise sources from associated facilities in residential area were selected for analysis; choicing 12 typical noise sources such as noises from electricity supply systems, underground parking, elevator equipments, heat supply systems, water discharge and supply systems, air condition equipments and ventilation system, adopting VS302USB double passage actual analyzer, the numeral sound signal of above facilities at normal operation state was investigated and recorded. Furthermore, the spectrum of these noise sources and the energy ratio of the low, middle and high frequency bands were analyzed through sound signal treatment. The maximum sound pressure degree of each sound source was located the most in low-frequency bands (9 in 12 typical noise sources) and the most energy distribution was also the most in low-frequency bands (7 in 12 typical noise sources). So the low-frequency noise were the most noise sources in the resident area.