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.
