跨座式单轨列车与地铁列车通过高架线路时辐射噪声特性对比试验

Comparative Experimental Research on Radiated Noise Characteristics of Straddle Monorail Trains and Metro Trains Passing through Elevated Tracks

[目的]城市轨道交通的辐射噪声对环境影响较大,当前针对地铁列车辐射噪声的研究不能直接指导跨座式单轨列车的外部噪声控制,因此有必要进一步研究跨座式单轨列车的辐射噪声特性。[方法]将重庆轨道交通1号线作为地铁列车辐射噪声试验对象,将重庆轨道交通3号线作为跨座式单轨列车辐射噪声试验研究对象,采用试验的方法研究了跨座式单轨列车和地铁列车运行过程中的辐射噪声声压级;选取与轨道梁中心距离分别为7.5 m、10.0 m、20.0 m处的测点进行研究,对比分析了不同工况下,跨座式单轨列车和地铁列车各测点的声压级。[结果及结论]跨座式单轨列车在直线路段的平均最大辐射噪声声压级整体大于曲线路段,且其随着测点与轨道梁中心距离的增加而逐渐减小。直线路段和曲线路段工况下,跨座式单轨列车的平均最大辐射噪声声压级比地铁列车的平均最大辐射噪声声压级小4~10 dB(A)。

[Objective]Radiated noise from urban rail transit has a significant environmental impact.Current research on the radiated noise of metro trains cannot directly guide the external noise control for straddle monorail trains.Therefore,it is necessary to further study the radiated noise characteristics of straddle monorail trains.[Method]Chongqing Rail Transit Line 1 is taken as the experimental subject for metro train radiated noise,while Chongqing Rail Transit Line 3 is selected for straddle monorail train radiated noise.The study adopts experimental methods to investigate the SPL(sound pressure level)of radiated noise during the operation of staddle monorail trains and metro trains.Measurement points are selected at distances of 7.5 m,10 m,and 20 m from the center of the track beam,and a comparative analysis is conducted on the SPL at these points under different operating conditions.[Result&Conclusion]The average maximum radiated noise SPL of straddle monorail trains on straight track sections is overall higher than that on curved track sections.It gradually decreases as the distance between measurement points and the center of the track beam increases.Under both straight and curved track conditions,the average maximum radiated noise SPL of straddle monorail trains is 4 to 10 dB(A),lower than that of metro trains.