Wide-area order tracking method and system for monitoring train running gear

Abstract

The invention discloses a wide-area order tracking method for monitoring a train running gear. The method comprises the following steps: obtaining a time-domain vibration signal sequence f (t) collected by a vibration sensor, and obtaining a key-phase vibration signal sequence f (theta) collected by a key-phase sensor at each key-phase phase point; according to the relationship between the key phase theta and the time t in f (theta) and f (t), adopting a spline interpolation method to construct a function relationship between any phase and the time t, and according to the relationship between the function relationship and the time domain vibration signal sequence f (t), adopting the spline interpolation method to construct a relationship between any phase and the vibration signal; obtaining a phase-vibration signal sequence, performing equal-angle resampling on the phase vibration signal sequence, and obtaining a resampled phase vibration signal sequence; and performing Fourier transform on the resampled phase vibration signal sequence to obtain the frequency and amplitude of the vibration signal. According to the invention, accurate order tracking is carried out on the characteristics of the train during running in a wide speed range of the train.

Description

technical field [0001] The invention relates to the technical field of mechanical fault diagnosis, in particular to a wide-area order tracking method and system for monitoring a running part of a train. Background technique [0002] During the running of the train, according to its route arrangement, there will be a continuous start-constant speed-braking cycle, and the working frequency of the running part will continue to change with the change of the speed of the train. Due to the continuous change of the working speed, the vibration signal of the rotating machinery under variable working conditions not only includes the vibration information of the mechanical equipment parts itself, but also includes the speed and load information. The fusion of these information makes the vibration signal very complex and non-stationary. characteristics, causing severe amplitude and frequency modulation of the signal. If traditional spectrum analysis techniques such as Fourier analysis...

AI Technical Summary

Problems solved by technology

However, for the operation site of the train running part, the disadvantage of the frequency multiplier solution is that: since the general operating environment of the train running part is relatively harsh, additional installation of a frequency multiplier will greatly reduce the reliability of the system; It is relatively difficult to transform existing equipment; in addition, the investment in frequency multipliers is not a small cost

The patent announcement number is CN102798462B. The instantaneous phase of the meshing frequency component is obtained by using the Hilbert transform, and then the original vibration signal is self-demodulated and transformed to obtain the order spectrum of the rotary equipment, thereby completing the order tracking without time scale. This method is wrong. However, it is approximated by a mathematical method. For the working conditions with a large speed change range (such as train running), there will be a large error interval, and it is difficult to be used uniformly.

[0006] In the existing technology, it is necessary to assume the order of the actual working condition signal to specify the resampling order. If the set resampling order is relatively small, it will lead to modal Aliasing, increasing the resampling order can avoid this phenomenon, but it will affect the efficiency of the algorithm. More importantly, in practice, the highest order to be analyzed is often unknown. Even if the sampling order is increased, the modal aliasing will also occur cannot be completely avoided

Images