【摘要】 为探明城市道路交通噪声频率特性及分布特点,选取哈尔滨市4个区域的8条道路对其进行频率监测。利用声能量和频率重心计算公式,分析各条道路的低频段、中频段、高频段能量分布及其频率重心。结果表明:城市道路交通噪声频段声能量主要呈现为中低频特性,且以低频为主;城市道路交通噪声的频率重心主要分布于100~400 Hz,集中分布在200~250 Hz;噪声频率随水平距离的增加衰减程度不同,距离越大,衰减越明显;不同类型道路的交通噪声频率特性随车速、车流量以及车型的变化而不同,在分析噪声频率特点时,应综合考虑各种因素的影响。对不同频率特性的道路交通噪声频率特性及分布的研究,将为今后依据交通噪声频率特性选择更合理的降噪方法提供理论依据。更多还原

【Abstract】 In order to investigate the frequency and distribution characteristics of urban road traffic noise,this paper selects 8roads of 4 areas in Harbin to carry out frequency monitoring. The sound energy and frequency center of gravity formulas are used to analyze low,middle and high frequency energy distribution and frequency center of the roads. The results show that the sound energy of urban road traffic noise is mainly low and middle frequency and the low frequency plays a dominant role. Furthermore,the frequency center of gravity is distributed in 100 ~ 400 Hz and is mainly distributed in 200 ~ 250 Hz. Attenuation of noise frequency varies with the increase of horizontal distance. The greater the distance is,the more the frequency attenuates. Traffic noise frequency of different types of roads varies with speed,vehicle flow and vehicle type and the influence of various factors should be considered while analyzing noise frequency characteristics. The study on the frequency characteristics and distribution of road traffic noise with different frequency will provide a theoretical basis for choosing a more reasonable noise reduction method based on the traffic noise frequency characteristics.更多还原