Design Of High-Speed Train Noise Testing System And Data Processing

In recent years.high speed rail achieve rapid development with the rapid development of economy and society in our country. It's one of the important methods to solve the minsheng problem to construct high speed rail massively.High speed train has great volume and efficiency,which could not only alleviate the tense situation of traffic.but also promote rapid development and function upgrade in the town along the railway.It will facilitate the development of new town.accelerate the urbanization process in our country,and meet the demand of well-off city finally. With the great effect on economy and society.high speed rail generates noise pollution in move,which brings relevant environment problem.So it's necessary to measure the noise in high speed train.There's two stages in this thesis.one for the design of noise data accquistion system and the other for the data analysis.Noise data accquision system is based on the controller FPGA.At first,the microphones transform the signal,then the signal disposal device achive the amplification and filter process in the signal.at last AD converter transforms the analog signal into digital signal.FPGA Contrls the whole process,stores the data in NAND FLASH and transfer it to upper computer.A weighting and 1/3 octave are two most important parameters in data analysis,which are calculated by programming. A weighting is approximate consistent of ear hearing,which is compared to 1/3 octave. So we could achive characteristics of high speed train noise distribution regularity.and provide the basis for the noise reduction and train retrofit.