Study On Noise Decrease For Increase In Sound Absorption In The Ticket Office Of The Railway Station

With the rapid development of rail transit,the ticket office becomes a fully functional,crowded and noisy hall,which needs to be improved.However,the study on the noise of ticket hall is mostly limited to the investigation of the noise status and the general noise reduction measures of ticket hall,and no specific noise reduction measures are proposed according to the sound sources and spatial characteristics of ticket hall.Therefore,based on the determination of the sound source and noise status of a ticket office,this paper proposes some measures to reduce the noise.The noise and the reverberation times in the ticket office are measured on the spot,and it is higher than the limit of 70 d B(A).The main noise sources are determined,and an online questionnaire survey is conducted according to the noise status of the ticket office.The sound field of the ticket office is modeled with EASE software,the distribution of sound pressure level is analized and the reverberation times are calculated.And the simulation results were compared with the experimental results.According to the simulation and test results,a sound absorption and noise reduction scheme is proposed,and the acoustic parameters,thickness and arrangement of the material are determined.The main conclusions are as follows:The average sound pressure level in the ticket office is 74.2d B(A)above the station noise limit of 70 d B(A),and the reverberation time is 3.8s above the optimal value 1.2s at500 Hz 1/3 octave band.The main noise source is the conductor’s voice through the louderspeaker,which is consistent with the survey results.Simulation results and tests show that before noise reduction,the sound pressure level in the area near the wall of the ticket office is higher,and the sound field in the area far away from the wall is relatively uniform,with reverberation sound as the dominant sound.According to theoretical calculations and simulation calculations,the noise reduction is up to 5.4d B(A),and the sound pressure level in the ticket hall after noise reduction is 68.8d B(A)below the noise limit.