Contribution analysis of interior noise and floor vibration in high-speed trains by operational transfer path analysis

A study on the contribution analysis of interior noise and floor vibration in high-speed trains was conducted using operational transfer path analysis. Initially, noise and vibration measurement at various locations on a high-speed train was conducted with accelerometers and microphones. Measurement positions were selected based on the dominant sources of noise and vibration aboard high-speed trains when traveling at high speeds. From the measurements, the characteristics of interior noise and floor vibration were deduced at various train speeds. In addition, noise and acceleration characteristics of the source positions at various speeds were also suggested. Synthesized results regarding interior noise and floor vibration were obtained from operational transfer path analysis, and the estimation was validated by comparison with measured results. The synthesized results were obtained by combining transfer functions obtained through operational transfer path analysis and measured signals from the sources. After validation, the contribution analysis of the interior noise and floor vibration was conducted from the synthesis of the transfer functions and the measurement results. Finally, the main sources of interior noise and the floor vibration in the frequency domain were derived from the contribution analysis. From the results, wheel noise and center pivot vibration were identified as the main causes of interior noise and floor vibration in a high-speed train at a speed of 300km/h.