Measurement Method Of Track Irregularity And Its Spectrum Analysis

With the rapid development of China's high-speed railway,the study of the smoothness of the track is particularly important for the railway system.The smoothness of the track is lower than the minimum value of the train operation,which is the main cause of the safety accident of the train.When the smoothness of the track is good,the high-speed train has little vibration during the driving process,and the comfort of the person riding the train is good.When the smoothness of the track is poor,not only the vibration of the car body will increase,but also Causes large noise,which makes the human body's comfort drop rapidly and may cause the vehicle to derail and threaten personal safety.Therefore,studying the smoothness of the track is of great significance for ensuring vehicle safety and life safety.First of all,this paper introduces the concept of the current track smoothness and the classification of the track irregularity,the reasons for the formation,the influence of different track irregularities on the train travel.At the same time,this paper also introduces the commonly used measurement methods of the track irregularities.Secondly,in view of the limitations of the commonly used measurement methods for the track irregularities,this paper proposes an track centerline registration algorithm without control points,which registers the track midlines obtained by different sensors to compare different sensor measurement,and provides technical support for the future research on track smoothness using multiple sensors.Finally,this paper uses the windowed Fourier transform and wavelet analysis to analyze the relevant content of the track irregularity.The obtained track irregularity data is analyzed by the windowed Fourier transform method,and the track irregularity frequency domain structure within a certain mileage is obtained.Wavelet analysis is used to analyze the waveform irregularity of the track.The wavelet analysis method is used to analyze the original data of the track irregularity,and extract its main component and extract,locate and identify the waveform by calculating the maximum and minimum value of the waveform.In summary,through the post-registration analysis of the track center line under different sensors finds that the GNSS measuring track midline can reach 3-4 cm,which can provide technical support for the rapid measurement of the internal and external parameters of the track.In this paper the periodic irregular waveforms existing in the high-speed railway track can be identified located and the wavelength can be extracted.