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A Fault Detection Method for Urban Rail Train Wheel Flat Scars

A technology for fault detection and urban rail trains, applied to measuring devices, measuring vibration, and vibration measurement in solids, etc., can solve problems such as reduced safety and riding comfort, enhanced interaction force, and damage, and achieves obvious detection results. The method has strong applicability and good real-time effect

Active Publication Date: 2021-05-25
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 damage that can cause damage to vehicle and track components and cause issues such as reduced safety and ride comfort
The existing wheel detection technology cannot accurately and real-time detect abnormalities such as wheel flat scars, and cannot take effective measures to eliminate safety hazards in time, which is a monitoring problem in the development of urban rail transit

Method used

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  • A Fault Detection Method for Urban Rail Train Wheel Flat Scars
  • A Fault Detection Method for Urban Rail Train Wheel Flat Scars
  • A Fault Detection Method for Urban Rail Train Wheel Flat Scars

Examples

Experimental program
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Effect test

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 a method for detecting the flat scar fault of urban rail train wheels. The method is based on the improved Wegener-Will distribution time-frequency analysis method, and includes the following steps: collecting signals on site, applying adaptive noise reduction to the vibration signals; performing continuous wavelet transformation on the vibration signals, and linearly dividing the wavelet spectrogram into Time-frequency unit to meet the dimension of WVD; extract wavelet coefficients, analyze signal characteristics, and estimate thresholds; perform IWVD processing on vibration signals, and discriminate the wheel state according to the time-frequency map and time-frequency amplitude map of the signal; if the cross-interference term If the number N of components of the vibration signal is exceeded, return to re-estimate the threshold value and continue processing. Based on the improved Wegener-Will time-frequency distribution, the invention has obvious detection results and strong applicability.

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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Patent Type & Authority Patents(China)
IPC IPC(8): G06K9/00G01H1/00G01H1/12
CPCG01H1/003G01H1/12G06F2218/06G06F2218/04
Inventor 邢宗义郎宽
Owner NANJING UNIV OF SCI & TECH
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