Research On Acoustic Design Of Emergency Broadcast System In High-speed Train Station

The main research content of this paper is to complete the research of the sound field in the waiting room of the high-speed railway station, and provide a reliable basis for the safety evacuation design. At the same time, the international advanced acoustic theory and research method is introduced to th e domestic related research, providing a reference for other types of large space acoustic research, and finally put forward the feasible high iron station emergency broadcast system acoustic design strategy.Firstly, it introduces the characteristics of the sound field in the waiting room of the high special exhibition hall, which is characterized by a large amount of space, long reverberation time and poor language definition. The composition and control flow of the emergency broadcasting system are intro duced, and the most common arrangement form of the sound source system in the waiting room of the high-speed railway station is defined.Secondly, from the point of view of the electroacoustic design of in the simulation by changing acoustic source arrangement, respectively to study the effect of sound source spacing and the sound source location on speech intelligibility. The study found that with the increase of the sound source spacing, the average value of STI in the space increased, but the uniform of STI become poor; when the sound source is located in the side wall of the 15 m high and corners,the average of STI in the space became higher and more uniform distribution. Therefore, in the acoustic design of emergency broadcast system, we should ensure that all the listening area is in the reverberant radius of sound sources as far as possible; and reverberation time is not the sole indicator of speech intelligibility, only by reducing the reverberation time can not guarantee a good speech intelligibilit y.On the basis of the above parameters, from the perspective of architectural acoustics design, the effects of the position of sound absorption material, the sound absorption capacity and the volume of space on the speech intelligibility are studied respectively by converting the sound field conditions.The study found that when the sound absorption material is located in the ceiling, the average value of STI and distribution uniformity are better than the case of side wall. With the increase of space sound absorption, the average value of STI in space is obviously increased, but its distribution is not uniform.We can get a higher level of language clarity and better STI value uniformity by controlling the space volume in the lower level.Finally, combined with the previous research income out of the conclusion, An acoustic design strategy is proposed to ensure the good performance of the emergency broadcast system in order to provide reference for the relevant engineering design practice.