摘要
城市轨道交通的噪声主要来自于轮轨噪声,抑制钢轨的振动速度,对降低轮轨噪声有显著作用,目前的轮轨降噪技术对于轮轨噪声,尤其是500 Hz以下的中低频率成分还缺乏理想的制约手段,而影响沿线地区声环境的主要是噪声中的低频成分。在阻尼钢轨、动力吸振器的基础上,开发了一种＂动力吸振多层约束阻尼钢轨吸振器＂,有显著降噪效果的频率下限为200 Hz。工程应用的结果表明：加钢轨吸振器后,正线的列车通过平均声级比原来降低约4 dB（A）,列车站台噪声降低2 dB（A）～3 dB（A）。该型钢轨吸振器现场安装方便,使用的胶粘剂对钢轨没有腐蚀作用,不会造成对线路通讯、钢轨探伤和列车行驶的不良影响。
Wheel-rail noise plays a dominant part in the overall noise of urban railway transportation.It is a key issue to restrain the vibration velocity of rail for reducing wheel-rail noise.Most current techniques are not effective enough for reducing wheel-rail noise,especially for the frequency components lower than 500Hz,which make great contribution to the acoustic noise pollution on the zone along railway.Based on damping rail and dynamic absorber,a novel constrained damping dynamic absorber on railway was developed,which had a lower limitation of effective frequency band about 200 Hz.The application results showed that the noise on the normal railway reduced near 4dB(A),and noise on platform reduced near 2~3dB(A).This constrained damping dynamic absorber was easy to be stuck on a rail,and had no negative effect on the communication function of railway,vehicle running and supersonic detecting damage of rail.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第10期78-80,共3页
Journal of Vibration and Shock
关键词
轮轨噪声
动力吸振器
阻尼
轨道交通
wheel-rail noise
dynamic absorber
constrained damping
urban railway
