High speed railway rail corrugation acoustic diagnosis method based on IMF (Intrinsic Mode Function) energy ratio

Abstract

The invention relates to a high speed railway rail corrugation acoustic diagnosis method based on an IMF (Intrinsic Mode Function) energy ratio, and belongs to the technical field of high speed railway vibration noise. The method comprises the following steps that: (1) testing rail roughness; (2) carrying out ensemble empirical mode decomposition; and (3) obtaining an IMF energy ratio: according to the energy ratio of an IMF signal corresponding to fault characteristic frequency, carrying out rail corrugation fault identification, screening to obtain an IMF component corresponding to the railcorrugation, and obtaining a Hilbert marginal spectrum and instantaneous frequency through HHT (Hilbert-Huang Transform). By use of the high speed railway rail corrugation acoustic diagnosis method based on the IMF energy ratio, a direct method is adopted on an operation line to actually measure the rail roughness characteristics of a corrugation-free zone, the IMF energy ratio obtained after an acoustic signal is subjected to EEMD (Ensemble Empirical Mode Decomposition) is subjected to component screening, and IMF energy ratio distortion characteristics are used for carrying out rail corrugation identification. Compared with theoretical acoustic frequency corresponding to the rail roughness actually measured by the direct method, the invention puts forward an efficient high speed railwayrail corrugation acoustic diagnosis strategy.

Description

technical field [0001] The invention relates to an acoustic diagnosis method for rail corrugation of a high-speed railway, in particular to an acoustic diagnosis method for rail corrugation of a high-speed railway based on an IMF energy ratio, and belongs to the technical field of high-speed railway vibration and noise. Background technique [0002] Rail corrugation is a periodic wavy uneven curve that appears on the surface of the rail. Rail corrugation in high-speed railways leads to the vibration and noise generated by the medium and high frequency vibration response of the vehicle-track system, which directly affects the comfort of passengers and the health of residents along the railway. Quality of life, while deteriorating the operating status of each component of the system, aggravating further damage to the rail surface. [0003] Regarding the detection of rail corrugation, in the past, traditional corrugation rulers were used for manual sampling measurement using th...

AI Technical Summary

Problems solved by technology

The amplitude of rail corrugation on high-speed railways is often small at the initial stage, and the acoustic signal generated by the train in running state is inevitably disturbed by noise, and the pulse signal reflecting fault information is easily submerged. The resonance frequency of the railway vehicle-track coupling system or the components of the wheel-rail system is related, so when there is no corrugation, the acoustic signal often has a peak frequency at the characteristic frequency of corrugation. Therefore, the commonly used time-frequency analysis for unsteady signals is used technology, it is also difficult to accurately identify rail corrugation features in the time-frequency spectrum features

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