Research On Railway Noise Prediction

Noise prediction research not only improves noise control effect,but also reduces cost,so noise prediction technology has been developing rapidly. Japan and some countries of Europe do a great deal of work at the aspect of noise prediction. But our country does less work at this aspect,which doesn't adapt badly to the railway development of our country,so it is necessary to research more at this aspect.Due to the complexity of noise prediction calculation,the train running noise was taken as line sound source to predigest the model in fore prediction commonly,by this way,the error of the result and the fact value was relatively great. In this paper the train running noise level has been predicted with the theory of point sound source. The sound exposure level of a train set pass,equivalent continuous sound level and maximum sound level of a train set pass has been taken as estimate values,and some kinds of affixation attenuation on the course of noise propagation is considered,then the corresponding visual software has been developed. These make it convenient and precise to predict the noise level. The analysis of this paper indicted:The calculation of software is trust;and it can predict city roadway traffic noise level,and some valuable conclusions for taking measures of reducing noise level are educed.At the same time this paper calculates the effect of train velocity on noise propagation,when mach number is 0.1,sound velocity less effects on noise level;when mach number is 0.4,the difference value is about 2dB whether to consider the sound velocity. So when the train velocity is not very high,the effect of sound velocity may not be considered.The exploitation of this software makes complicated noise prediction calculation convenient. This paper also does some primary research for model experiment if this prediction way,model experiment and fact measure can be fell together,then some factors which is difficult to consider will be corrected,by this way the result will be more precise. This research production will take huge function for railway noise control,wayside layout and new railway aftertime.