Analysis And Synthetise Of The Vibration Signals From High-Speed Train

As a new type of source,high-speed railway source has the advantages of easy collection,no pollution,strong regularity and high repeatability.By studying the high-speed railway vibration and analyzing the vibration characteristics,we have a deeper understanding of the propagation law of high-speed railway vibration.In view of the fact that improving the application of high-speed railway vibration signal in practical engineering has always been a problem faced by many geophysical researchers,a method of directly observing the signal waveform of high-speed railway vibration time domain is proposed to monitor the running state of high-speed railway.The time domain signal of high-speed railway vibration has a strong regularity.Through a large number of data comparative analysis,it is found that there is a kind of periodic phenomenon.The clarity of this kind of periodic phenomenon plays an important role in the feasibility analysis of this method.In view of this,through the synthesis of high-speed railway vibration time domain signal,the paper analyzes the relationship between the definition of high-speed railway vibration time domain signal waveform periodic phenomenon and the running speed of high-speed railway as well as the distance between high-speed railway and observation point,and makes a preliminary study on its feasibility.The research content of this paper mainly includes:(1)The research data of high-speed railway operation monitoring,high-speed railway vibration and synthetic seismic recording methods at home and abroad are collected,and the research contents,ideas and methods of this paper are summarized.(2)Refer to the literature to collect the relevant principles and methods used in the process of high-speed railway vibration time domain signal synthesis,mainly including the attenuation principle of seismic wave,rake wavelet and other relevant contents.(3)The specific process of vibration characteristic analysis of high-speed railway in this work is described.It includes analyzing the formation mechanism of high-speed railway vibration,arranging observation points along the Guiyang Guangzhou high-speed railway in Lingchuan County,Guilin City,Guangxi Province,using engineering seismograph to collect the actual vibration signal data of high-speed railway,processing and analyzing five groups of data,and then finding out the characteristics of high-speed railway vibration signal.(4)The synthesis of high-speed railway vibration time domain signals is carried out,including the construction of two kinds of high-speed railway source signals by using the reyko wavelet function,the synthesis of high-speed railway vibration signals and the test and analysis of the synthesis results.The results show that:(1)The waveform of the synthesized high-speed railway vibration time domain signal is similar to that of the actual high-speed railway vibration time domain signal.By setting different parameters for comparative analysis,the operation speed of high-speed railway and the distance between high-speed railway and observation point have a great impact on the clarity of the periodic phenomenon of the high-speedrailway vibration time domain signal waveform.The current condition is to restore the synthesis method When the performance is good and the frequency spectrum characteristics of high-speed rail vibration are fixed,the running speed of high-speed rail is inversely proportional to the definition of periodic phenomena of high-speed rail vibration time domain signal in a certain range.The smaller the speed is,the clearer the periodic phenomena of high-speed rail vibration time domain signal are;the distance between high-speed rail distance detection point and the definition of periodic phenomena of high-speed rail vibration time domain signal are also inversely proportional to the distance When the distance increases,the resolution of the periodic phenomena in the vibration time domain of high-speed railway becomes smaller.(2)It is not mature to analyze the running state of high-speed railway by directly observing the signal waveform in time domain of high-speed railway vibration.The reason is that there are many influencing factors and the definition of periodic phenomenon of waveform is not stable,which needs further study,but it still creates conditions for the extensive application of high-speed railway vibration signal in the future.