Urban rail train wheel flat fault detection method

A technology for fault detection and urban rail trains, applied in measurement devices, vibration measurement, vibration measurement in solids, etc., can solve problems such as enhanced interaction force, reduced safety and ride comfort, injury, etc., and achieves strong applicability of the method. , the detection results are obvious, the real-time effect is good

Active Publication Date: 2017-11-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, with the rapid increase in the speed of urban rail vehicles and the rapid increase in the number of passengers, the interaction force between the wheel set and the track has increased, resulting in an increasing number of non-circular contact surfaces between the wheel set and the rail, including flat scars on the wheel tread The most common form of d...

Method used

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  • Urban rail train wheel flat fault detection method
  • Urban rail train wheel flat fault detection method
  • Urban rail train wheel flat fault detection method

Examples

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Embodiment 1

[0089] Apply the described IWVD time-frequency distribution analysis method, and use the simulation data obtained by the computer simulation model established by Simpack to carry out experiments: select the simulation signal and the speed of 60 kilometers per hour for the single-section carriage bogie fault-free wheel at a speed of 60 kilometers per hour The single wheel of No. 1 bogie of the single car per hour is processed with the simulation signals of 20mm, 40mm, and 80mm flat scars respectively. Its time domain diagram is as image 3 As shown, where (a) is the simulated signal diagram of a non-faulty wheel, (b) the simulated signal diagram of a 20mm flat-scarred wheel, (c) the simulated signal diagram of a 40mm flat-scarred wheel, and (d) the simulated signal diagram of an 80mm flat-scarred wheel. The time-frequency diagram of IWVD is as follows Figure 4 As shown, where (a) is the IWVD diagram of a non-faulty wheel, (b) is the IWVD diagram of a 20mm flat-scarred wheel, ...

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Abstract

The invention discloses an urban rail train wheel flat fault detection method. The method is on the basis of an improved Wigner-Ville distribution time frequency analysis method, and comprises the following steps of: acquiring signals on the spot, and carrying out adaptive denoising on vibration signals; carrying out continuous wavelet transform on the vibration signals, and linearly dividing a wavelet spectrogram into time frequency units so as to satisfy dimensionality of WVD; extracting a wavelet coefficient, analyzing signal features and estimating a threshold value; carrying out IWVD processing on the vibration signals, and carrying out wheel state discrimination according to a time frequency graph and a time frequency amplitude graph of the signals; if cross interference items exceed a component number N of the vibration signals, returning to re-calculate the threshold value and continuing to carry out processing. The method is on the basis of improved Wigner-Ville time frequency distribution, so that the detection result is obvious and the applicability is high.

Description

technical field [0001] The invention belongs to the technical field of wheel detection, in particular to a method for detecting flat scar faults of urban rail train wheels. Background technique [0002] The train wheel set is one of the most important parts in the running parts of the vehicle. It not only bears the full weight of the vehicle body and passengers or goods, but also is responsible for transmitting the interaction force between the wheel set and the rail, especially when the wheel passes over the rail. The vertical vibration acceleration on the The wheel set needs to withstand more impacts, including large static loads and dynamic loads, assembly stress and brake pads, thermal stress generated by brake pads during braking, and centrifugal force when passing through curves. [0003] However, as the speed of urban rail vehicles increases and the number of passengers increases sharply, the interaction force between the wheel set and the track increases, resulting ...

Claims

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Application Information

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IPC IPC(8): G06K9/00G01H1/00G01H1/12
CPCG01H1/003G01H1/12G06F2218/06G06F2218/04
Inventor 郎宽邢宗义
Owner NANJING UNIV OF SCI & TECH
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