谐振式浮轨扣件结构及钢轨减振降噪效果试验分析

摘要

The structural characteristics of a tuned damper system for a floating rail fastener used in a rail subway system are introduced. The tuned damper system has been designed based on the dynamic absorber theory to reduce rail vibration in the frequency range below 2 000 Hz. The side supporters of rubber wedge of the fastener contain several tuned masses. The rail vibration energy can be transferred and absorbed by the tuned masses so that the rail vibration and noise radiation can be reduced. Measurement results in Chengdu Metro Line 1 show that comparing with DVT I2 fastener track, the vertical vibration of the rail can be reduced by 1.5 dB and the horizontal vibration can be reduced by 0.8 dB with the use of this fastener system. Thus, this system provides an approach to solve the problem of rail vibration induced by softer rail fasteners.%介绍一种用于地铁交通的谐振式浮轨扣件的结构、特点及其谐振系统。该扣件利用动力吸振原理，针对地铁钢轨2000 Hz频率范围设计了内含谐振质量块的橡胶支撑楔块，以吸收钢轨的振动能量，可在一定程度上抑制因低刚度隔振扣件对钢轨振动的影响，降低钢轨的振动和噪声辐射。在成都地铁一号线上进行的实测，其结果表明谐振式浮轨扣件相对于DVT I2扣件钢轨的垂向振动减少了1.5 dB，横向振动减少了0.8 dB，减小了低刚度隔振扣件对钢轨振动增加的影响。