The Contrast And Research On Different Confirming Methods About Reverberation Time Of Medium And Small-scale Gymnasium

The fast gymnasium buildings develop, the more requirements to gymnasiums' the acoustic environment that people demand is occurred, so is the acoustics design in gyms. Reverberation time is not only an important index in architectural acoustics design, but also an important parameter to appraise gyms' timbre quality.Different reverberation time should be designed according to different functions in gyms. However, as most gyms in China are multi-functional and comprehensive so far, they are not merely confined to the sport competitions, sometimes also hold some literature and art joint performances, singing competitions and meetings, all of which make reverberation time of gymnasium is designed as an appropriate digit in order to assuage the side-effects of sound due to short reverberation time : astringent feeling, not plump, too long, muddy pronunciation, producing the effect of sheltering between the syllables , affecting people's understanding ability .The original method to confirm reverberation time in designs is to use computational formula W . C. Sabin put forward in early century. Based on the assumptions that indoor acoustic field spread fully and decayed equally, Sabin proposed that the reverberation time is proportion to room's volume, inverse proportion to the volume of sound absorption in the room.The appearance of the computer simulating procedure has offered another method to definite reverberation time. People can set up the environmental model of acoustic field of gymnasiums using this software, then simulate diffusion, absorption and attenuation of sound waves so as to calculate the reverberation time finally.Gymnasium final reverberation time still should be measured by instruments; the result should be contrasted with those of formula and computer program. Lots of experience indicates that errors lie in these three methods, what is the real reason to produce error is the purpose of this dissertation.This paper starts with such respects affecting reverberation time as volume , size , level form of time to contrast different kinds of sound absorption characteristics and the different impacts on material sound absorption performance of the characteristic of sound-absorbing material in the sounds of design ; Then , the paper explains separately the theoretical foundation and prerequisites of calculating formula of reverberation time, the design thoughts of the computer simulation procedure and method of calculating reverberation time, and operation principles and instructions for...