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A wheel fault diagnosis and fault prevention method for identifying apparent thermal grid impact

A fault diagnosis and grid division technology, which is applied in the field of protection and reliability design, and rail vehicle wheel safety monitoring, can solve the problems of undetected thermal division cracks, etc., and achieve the effect of rapid expansion and extension and accident prevention

Active Publication Date: 2020-02-28
北京唐智科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Before the inventor proposed the wheel thermal grid crack theory, there was no similar theory reported in the literature, nor about detecting thermal grid cracks and its impact, detecting apparent thermal grid cracks and impact, and detecting thermal grid fault expansion reports of failure forms, etc.

Method used

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  • A wheel fault diagnosis and fault prevention method for identifying apparent thermal grid impact
  • A wheel fault diagnosis and fault prevention method for identifying apparent thermal grid impact
  • A wheel fault diagnosis and fault prevention method for identifying apparent thermal grid impact

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0059] One of the embodiments, according to the diagnosis theory and monitoring data, the driving control suggestion is put forward

[0060] It is known that the primary sprung resonant frequency of rolling stock is usually FG0=20~24≈22Hz.

[0061] Then because the sprung mass M=25t of a certain locomotive is about M / m=4.39 times of the unsprung mass m=5.7t, because the sprung and unsprung mass share spring (stiffness is K) and damper (damping is η ) contact, so,

[0062] When the wheel does not leave the track, the resonant frequency of the sprung resonance system formed by M, K and η is FG0=(K / M)^0.5 / (2π),

[0063] When the wheel jumped off the track, the resonant frequency of the unsprung resonance system formed by m and K, η was FG=(K / m)^0.5 / (2π);

[0064] Therefore, unsprung FG>sprung FG0, the estimated unsprung generalized resonance frequency is FG1=(M / m) 0.5 FG0=4.39 0.5 ×22=46Hz.

[0065] A car often runs at the speed of N = 300r / min, as attached Picture 1-1 . W...

Embodiment 3

[0073] Embodiment three: according to the formula (3) C=A+20log(RJ / 3) correction alarm level difference

Embodiment 2

[0074] What is listed in the second embodiment is that the early warning is reached according to the level difference of the 1st to 3rd order decision of the tread, and then the apparent thermal grid is solidified or expanded into multi-deformation confirmation, supplemented by the deduction of "multilateral early warning". The essence is to use the modulation spectrum of the apparent thermal grid shock to issue an alarm at the "warning" level. If the apparent thermal grid shock develops to a constant amplitude without modulation, the modulation spectrum will be lost and the diagnosis will be missed; even if there is modulation in the apparent thermal grid shock, the amplitude of the modulation spectrum is low, such as attached diagram 2-1 , attached Figure 2-2 , the alarm level is low (early warning) and cannot guide timely maintenance. In order to prevent the missed diagnosis of the apparent thermal grid impact, it is necessary to use the magnitude of the apparent thermal...

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PUM

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Abstract

The invention discloses a wheel fault diagnosis and fault prevention method capable of recognizing apparent hot partition impact. According to the wheel fault diagnosis and fault prevention method, hot partition and apparent hot partition impact monitoring and alarming, and submission of proper maintenance are performed during running of a wheel, so that the hot partition is immediately prevented from being differentiated into an apparent hot partition crack deepened into a wheel center or continually expanding into polygonal non-circularity; resulting wheel accidents are prevented; the service life of the wheel is prolonged by immediate elimination of damage and prevention of rapid expansion; and damage to adjacent components caused by wheel apparent hot partition and expanding polygonal non-circularity impact is prevented. Under the current situation that optimization of a wheel manufacturing process is not realized to eliminate or reduce the internal causes of the hot partition impact, unsprung nonlinear generalized resonance is found through monitoring diagnosis; a driving control suggestion of changing the driving speed is given; the unsprung nonlinear generalized resonance caused by the hot partition impact is avoided; the condition under which the hot partition is differentiated into consolidated apparent hot partition is avoided; and the occurrence of the consolidated apparent hot partition and the polygonal non-circularity is delayed.

Description

technical field [0001] The invention belongs to the technical field of rail transit vehicle wheel safety monitoring, protection and reliability design, and in particular relates to a wheel fault diagnosis and fault prevention method for identifying apparent thermal grid impact. Background technique [0002] Steel wheels for rail transit are divided into cast steel wheels and rolled steel wheels. The cast steel wheel is obtained by casting the molten steel obtained by smelting directly in the mold, and the rolled steel wheel is obtained by rolling the casted wheel blank in the mold. The basic material of these two types of wheels is the casting formed by the cooling of molten steel. Since molten steel is condensed into castings, crystallization will occur—the same kind of substances will condense into crystals, and impurities will be squeezed into the lattice between the crystals, so that the castings are composed of a large number of crystal collections; and the simple roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 唐德尧李修文
Owner 北京唐智科技发展有限公司