Objective Evaluation of Sound Quality of Noises inside High Speed Train

The noises in the driver's cab and the carriage of a high-speed train are measured respectively at different speeds on site.By using the linear sound pressure level,A-weighted sound pressure level and specific loudness,the spectrum characteristics of the measured interior noises at 330km/h are analyred and the dominant frequency ranges are identified.Objective evaluation of the measured interior noises are carried out in respect of the sound quality of loudness,sharpness,roughness and fluctuation strength based on the psycho-acoustical theory.The research results indicate as follows:Analysis of the specific loudness accurately characterizes the frequency components which induce changes in loudness to the feeling of human ears;The loudness of interior noises at all measure points enhances coutinuously with increasing of the train speed,especially in the cab,the front car of the train,Which is under intensified aerodynamic effect;Loudness assessment tells that the interior acoustic environment of the high speed train needs to be further improved to satisfy the requirements of passengers for acoustic comfort,especially in the cab and at the position of the centre plates of the carriage where appropriate measures should be taken to reduce vibration and noises.