A PRELIMINARY STUDY OF THE SPEECH CLARITY OF THE HIGH-SPEED RAILWAY WAITING HALL-AN EXAMPLE OF CHENG DU RAILWAY STATION

摘要

With the continuous development of high-speed train technology in China, many high-speed train lines have been incorporated into the national plan, and high-speed railway stations have gradually become the indispensable center of urban economic and cultural development. As the main part of high-speed railway station, waiting hall plays an important role in passenger diversion waiting. Because the high-speed railway station belongs to the super-large space in acoustics, there is little research data on its acoustical characteristics. At present, China has not formulated the acoustical design specifications for high-speed railway station, so there is no reference for the acoustic design parameters of waiting hall. For this kind of huge public space, how to hear public broadcasting clearly is the primary problem of acoustic design. In this paper, the main acoustic parameters (STI, STIPA and RT) related to speech intelligibility are selected to simulate and analyze the acoustic characteristics of the waiting hall of Chengdu Railway Station. The analysis results show that the reverberation time of the waiting hall with a volume of 1.2 million cubic meters can be shortened to 6.2seconds and the average speech transmission index of the waiting hall can reach 0.4 by using perforated aluminum panels with acoustic tissue applied on the back in the ceiling. Afterreasonable electroacoustic design, the average speech transmission index of public broadcasting in waiting area can be increased to 0.5 by using strong directional loudspeaker array with large horizontal coverage angle and small vertical coverage angle to cover passenger seats evenly. According to IEC 60268-16 standard, STIPA results are in the fair level (0.45-0.60).