A method for detecting and evaluating the stability of rail vehicle snaking motion

Abstract

The present invention provides a method for detecting and evaluating the stability of the snaking motion of a rail vehicle. Aiming at the problems of large energy loss and inaccurate peak extraction due to the narrow filter frequency band in the existing snaking motion detection method, the present invention is based on the snaking motion The high-order odd harmonic frequency characteristic filters the sampling signal to obtain a broadband filtered signal; and within the predetermined frequency identification range, conducts snake main frequency identification on the filtered signal to obtain the snake main frequency; then, filters the filtered signal again to obtain the snake main frequency signal; then extract the first peak sequence and its corresponding time series by performing continuous peak extraction on the main frequency signal in the time domain; use the main frequency oscillation cycle ratio rule of the main frequency to extract the continuous peak value of the filtered signal based on the time series, thereby A second peak sequence is obtained, and vehicle stability can be judged based on the second peak sequence. The method provided by the invention can improve the discrimination sensitivity and the accuracy of peak extraction.

Description

technical field [0001] The invention belongs to the field of monitoring the running safety state of a running part of a rail vehicle, and in particular relates to a method for detecting and evaluating the stability of the snaking motion of a rail vehicle. Background technique [0002] The wheel-set meandering motion is one of the inherent characteristics of rail vehicles. The fundamental reason for its formation is determined by the geometric characteristics of the rail vehicle wheel-rail contact, and the wheel-set meandering motion of rail vehicles cannot be fundamentally eliminated. When the running speed of the vehicle exceeds the critical speed of snaking motion, the lateral and oscillating motion of the bogie and the vehicle will develop into an unstable state with gradually expanding amplitude, which will bring great safety risks to the vehicle operation. Therefore, monitoring the bogie snaking state is of great significance to ensure and improve the safety of vehicle ...

AI Technical Summary

Problems solved by technology

[0008] In summary, due to the large energy loss of the filtered signal, or the inaccurate peak value extracted, the sensitivity of the discrimination of the stability of the rail vehicle snaking motion needs to be improved.

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