不同行驶条件下轨道交通噪声频率特性比较研究

Study on Frequency Characteristics of Rail Traffic Noise on Different Running Conditions

选取上海轨道交通1号线和明珠线,分别对地面段和高架段列车加速出站、站间匀速以及减速进站时的噪声进行了多次采样分析,结果表明:在不同行驶条件下,轨道交通辐射噪声的频率特性会有显著差异,在列车加速出站、站间匀速和减速进站时,地面段轨道交通辐射噪声1/3倍频程谱主峰频率分别为200Hz、125Hz和200Hz,次峰频率则分别为2500Hz、250Hz和3150Hz;高架段主峰频率均为63Hz,次峰频率则分别为630Hz、630Hz和2000Hz。为提高轨道交通两侧声屏障的降噪效果,应视其辐射噪声频率特性不同分路段进行设计。

This paper studies frequency characteristics of the rail transportation noise of No. 1 Rail Traffic Line and Mingzhu Line in Shanghai. The noise samples are analyzed, which are recorded when the train accelerates to leave from the station, runs at a steady speed or decelerates to get into the station. The results indicate that the spectrums of rail traffic noise are different on different running conditions. According to the 1/3 octave spectrums of different samples, the first peak frequencies are 200Hz, 125Hz and 200Hz, and the secondary peak frequencies are 2500Hz, 250Hz, 3150Hz respectively when the train is running at the ground. The first peak frequencies are all 63 Hz and the secondary peak frequencies are 630Hz,630Hz and 2000Hz respectively when the train is running on the viaduct. To improve the noise reduction effect, it is important to take into account of the frequency characteristics in different sections when designing the sound barriers at the side of the rail traffic.