Noise and vibration spectrum of structure-borne noise from railway system

In this study, the spectrum and resonance frequencies of the structure-borne noise and vibration excited by the train traffic on concrete viaduct structure are examined. Comparisons of air- and structure-borne noise spectrum between local and overseas trains are taken. Real-time octave band and FFT (Fast Fourier Transform) mode are used to analyze structure-borne noise spectra in details. Based on the spectrum results of the structure-borne noise, air-borne noise lies on high frequency component and structure-borne noise lies between 20 Hz and 200 Hz, which is a tonal noise. From the FFT analysis, the vibration resonance frequencies are 43 Hz and 54 Hz and acoustics coincidence are 121.5 Hz and 128.5 Hz. The theoretical relationships between sound and vibration are in agreement with the experimental results. The results will be useful for the prediction of structure-borne noise from railways.