地铁小半径曲线段上列车车内振动测试与特性

摘 要：在地铁线路中，小半径曲线段的列车振动加速度一般大于同种轨道结构的直线段。为了研究小半径曲线段车内振动的频谱特性，选择了半径为350m的地下隧道区间进行测试，该区间分布着钢弹簧浮置板整体道床、科隆蛋扣件和DT-III型扣件三种轨道结构。分析了双面胶带、螺钉等多种传感器安装方式对测量结果的影响，采用DASP V11软件测量一天中三个不同时段车厢地板垂向和横向振动加速度，并进行Z振级和X振级分析。结果表明：半径为350m的曲线隧道内，钢弹簧浮置板整体道床、科隆蛋扣件和DT-III型扣件三个区段车厢地板振动对应的垂向振级峰值频率分别为8Hz和63Hz，3.15Hz、8Hz和63Hz，50Hz和100Hz；横向振级峰值频率为63Hz，63Hz，50Hz和100Hz；钢弹簧浮置板整体道床段和科隆蛋扣件段车厢地板振动加速度大于普通型扣件段。通过本次测试，为小半径曲线段振动噪声问题提供一些减振降噪措施选择方面的参考，同时为研究小半径曲线段车厢地板振动特性问题提供支持。

Measurement and Characteristics Analysis of Interior Vibration of Metro Vehicles in Small Radius Curved Sections

Abstract：In the metro line, the train vibration acceleration of the small radius curve section is generally greater than the straight section of the same kind of track structure. In order to study the spectral characteristics of the vibration in the metro with small radius curves, an underground tunnel section with a radius of 350m was selected for testing. The steel spring floating board monolithic track bed, Cologne egg fasteners and DT-III fasteners were placed in the interval. The effects of various sensor mounting methods, such as double-sided tape and screws, on the measurement results were analyzed. The vertical and lateral vibration accelerations of the carriage floor at three different times of the day were measured using DASP V11 software, and Z-level and X-level analysis was performed. The results show that the vertical vibration level corresponding to the steel spring floating board monolithic track bed, Cologne egg fasteners and DT-III fastener segments with a radius of 350 m, the peak frequencies are 8Hz and 63Hz, 3.15Hz、8Hz and 63 Hz, 50Hz and 100Hz, respectively; The lateral peak frequencies are 63Hz, 63Hz, 50Hz and 100Hz, respectively.Through this test, it provides some references for vibration and noise reduction measures for the small radius curve segment vibration and noise problems, and at the same time provides support for the study of the floor vibration characteristics of the small radius curve segment.