Study On Design And Optimization Of Noise Barrier For Railway

With the development of railroading in China, trains keeps speeding up for a long time. As a result, noise pollution from trains wins much attention and becomes a problem to be resolved urgently.As an effective and economic way of reducing noise, Noise barrier is widely used in noise pollution reduction. How to make use of this noise-reducing solution and exercise its biggest economical and technological effects is essential for improving our quality of life.This thesis gives a full explanation of the function of noise barrier of reducing noise, lists the attenuating model of it ,providing the basic theory for the design optimization as well as the prediction of noise-reducing effect.It also introduces the noise-absorbing materials and theory, indicates that the noise-absorbing materials will give its full play in whole when they can absorb noise in different bands, and deduce the formula on noise reducing and absorbing. We do research in the characteristics of five kinds of noise absorbing materials with stationary wave and also test the noise-absorbing modulus of the multiple noise absorbing barrier of useless tyre and the multiple noise absorbing barrier of glass cloth make comparison of them. The outcome shows that the multiple noise absorbing barrier of useless tyre is effective in absorbing noise in middle and low bands. My point of view is that it should be recommended valuably as a good material of noise barrier.This thesis also depicts detailed the design cycle and frame of railway noise barrier, analyses its noise-reducing target value,location, height,length,thickness,frame as well as signt design of it, further bring forward the scheme of optimizing design of the railway noise barrier: covering ratio shall be considered in the design of length;the materials of noise barrier shall be optimically chosen; the way of confirmation about the optimization scheme of noise barrier shall be provided considering the materials, length, height, noise-reducing volume as well as cost. Finally it indicates that the structure of noise barrier can be optimized with height of noise barrier limited and big target value of noise reduction.The way of calculating the general noise reducing volume will be predigested reasonably and necessarily in the railway noise barrier optimization design., considering the parameters such as length, height,location,structure,materials and noise-receiving points, providing the prediction of noise barrier'noise reducing effect.. According to it, a useful and convenient software which can predict the effect of noise barrier will be developed in Visual C++ language and will provide test standard for the design of noise barrier.