Track height irregularity prediction system and method based on axle box vibration acceleration

Abstract

The invention discloses a track height irregularity prediction system and method based on axle box vibration acceleration. The track height irregularity prediction system comprises an axle box vibration acceleration sensor, a rotation pulse tacho-generator, a simulation preprocessing circuit, an A / D (analog / digital) conversion circuit, an embedded system, a wireless network router and an upper computer. The axle box vibration acceleration sensor is arranged on an axle box disposed on a running part of a train. The rotation pulse tacho-generator is arranged in an end cover of a train axle. Axle box vibration signals collected by the axle box vibration acceleration sensor and train speed signals collected by the rotation pulse tacho-generator are subject to low-pass filtering processing through the simulation preprocessing circuit, analog signals are converted to digital signals through the A / D conversion circuit, the digital signals are sent to the upper computer by the embedded system through the wireless network router to be processed, and the upper computer measures the track height irregularity result through the vibration signals. The track height irregularity prediction system and method have the advantages of low cost and good implementation.

Description

technical field [0001] The invention relates to the technical field of track irregularity prediction, in particular to a track height irregularity prediction system and method based on axle box vibration acceleration. Background technique [0002] Track irregularity refers to the deviation of track geometry, size and spatial position from its normal state. The straight track is not flat or straight, and it deviates from the centerline position and the correct size of the track height and width; the curved track is not smooth, deviates from the centerline position of the curve, deviates from the correct value of curvature, superelevation, and gauge, and deviates from the changing size along the slope Equal orbital geometric deviations are commonly referred to as orbital irregularities. It is the main factor affecting the random vibration of rolling stock, the fatigue damage of track structure and the decrease of rolling stock operation safety. [0003] There are many reason...

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Problems solved by technology

[0004] Yang Wenzhong studied the acceleration of the axle box and the irregularity of the track (Yang Wenzhong's research on the relationship between the acceleration of the axle box and the irregularity of the track based on Xiaobo's research on the relationship between the acceleration of the axle box and the irregularity of the track, Tongji University Doctoral Dissertation 2008). Not smooth, but this method requires multiple accelerometers with different bandwidths, and the engineering construction is poor

[0005] Li Zaiwei et al proposed to use the Hilbert-Huang transform method to analyze the relationship between the unevenness of the vehicle-track system and the vertical vibration acceleration of the vehicle (Li Zaiwei, Lian Songliang, Liu Xiaozhou HHT in the vertical vibration of the vehicle-rail system Application in Time-Frequency Analysis, Vibration Test and Diagnosis 2013), using empirical mode decomposition (empirical mode decomposition, referred to as EMD) to decompose the measured height irregularity and vehicle vertical vibration acceleration signals to obtain the intrinsic mode function; then, by comparing and analyzing the time-domain waveform and the Hilbert energy spectrum of the two eigenmode functions, the deterministic correspondence between the high and low uneven eigenmode functions and the vehicle vertical vibration acceleration eigenmode functions is illustrated, The vertical vibration acceleration of the vehicle can be used to identify the bad section of the unevenness of the track. This method needs to collect vibration and track irregularity data based on the track inspection vehicle, and cannot be applied to ordinary operating vehicles.

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