Vibration Measurement and Analysis of High Speed Railway Based on Wavelet Analysis

Abstract

In order to better study the vibration characteristics of railway viaduct, field test and pulsation test are carried out for the bridge vibration caused by the operation of a high-speed railway train. The natural vibration frequency of the bridge is analyzed, and 1 / 3 octave analysis and wavelet analysis are carried out for the vibration signal caused by the train excitation. The analysis results show that: the measured value of vertical frequency of bridge is close to the theoretical value, and the measured value is slightly larger than the theoretical value; the wavelet analysis results show that the vibration energy of the measured points is mainly concentrated in the third frequency band (15.625 ∼ 31.25 Hz), the fourth frequency band (31.25 ∼ 62.5 Hz) and the seventh frequency band (250 ∼ 500 Hz). Compared with the urban viaduct, the vibration and noise analysis of high-speed railway bridge should be appropriately extended to 500 Hz. The time-frequency diagram shows that the main vibration frequency range of the bridge is about 30-60 Hz.