Study of analysis method of interior noise in railway cars by means of ray tracing method

Abstract

We have studied the analysis method of interior noise in railway cars by means of ray tracing method. By using a point source as an input which simulates the speaker test, the analysis result of sound decay along the longitudinal direction of the car didn't always match the measurement result. It is possibly because the wave character of the sound cannot be strictly simulated by the ray tracing method. On the other hand, in simulation for the running condition by applying multiple sources of which amplitude were estimated from the measured vibration of the interior panels, the tendency of the sound change by the difference of interior condition matched well between the analysis and the measurement.