| Track irregularity is one of the root causes of train vibration,which has an important influence on the smooth comfort and safety of running.Track irregularity measuring is divided intodynamic and static two types.the dynamic testing is carried out under load,axle load,track stiffness and inspection speed can affect the dynamic test results,and principle of dynamic and static testing different can lead to differences between dynamic and static test result.Different dynamic and static inspection principles can lead to different dynamic and static detection results,and the inspection site mainly carries out maintenance and review based on static results.At present,there are few studies on the correlation between dynamic and static test results,which is not conducive to guiding field maintenance.This paper conducted an in-depth study on the correlation of dynamic and static inspection data,and mainly completed the following contents:(1)The coupling model of vehicle-ballast track is established.Based on the finite element method,the coupling statics and dynamics simulation model of vehicle-ballast track is established.The track dynamic inspection with different track stiffness is simulated.The validity of the simulation model is verified by the measured data.(2)The correlation of measured dynamic and static track irregularity data was studied.The alignment algorithm of dynamic and static track irregularity is proposed.The correlation of dynamic and static track irregularity data is studied by time domain and frequency domain methods.The results show that the dynamic and static gauge,level and triangle pit are strongly correlated,while the height and track direction are strongly correlated.The dynamic and static gauge and the power spectral density of the triangle pit are basically the same.There are great differences in dynamic and static high and low and orbital spectral densities.The dynamic and static horizontal spectral densities vary greatly in the wavelength range from 1 to 10 m,and are basically the same above10 m.(3)The influence of sleeper suspension on dynamic inspection data is studied.According to the different conditions of sleeper empty lifting,the influence of different axle load and speed on the inspection data is studied.When the axle load deviation is greater than 1.5t,the deviation of track peak and peak value is greater than10%.After the wheel passes the sleeper empty lifting area,the inspection height still continues to fluctuate,with a fluctuation distance of 3m.Under the same axle load and speed,the peak-to-peak values increase linearly with the sleeper suspension depth,but it will not change when the single to consecutive six sleeper suspension depth increases to1.5mm,2.2mm,3.6mm,5.6mm,8.6mm,13.8mm,respectively.The inspection speed has a slight influence on the inspection results of high and low peak-to-peak values.(4)Dynamic detection simulation analysis of track irregularity.In order to make up for the influence that the measured data are difficult to compare the change of inspection speed and track stiffness,the influence of different track stiffness and inspection speed is studied by means of dynamic inspection simulation of track irregularity.It is found that the track stiffness presents a periodic distribution with the sleeper spacing when the bearing stiffness is the same.When the bearing stiffness changes within the normal range,the correlation coefficient between high and low is 0.99.When the track stiffness is 60 k N/mm,the dynamic high and low power spectral density is larger than the static one as a whole,and the dynamic high and low power spectral density at the speed of 60km/h is larger than that at 100km/h and160km/h as a whole. |
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