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Detection apparatus and method for steel rail failures based on characteristics of non-negative tensor resolution

A technology of non-negative tensor decomposition and detection method, which is applied in the field of detection devices for railway rail damage, and can solve problems such as difficulty in distinguishing damage characteristics.

Active Publication Date: 2013-03-13
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing flaw detection technology can only judge the damages with close damage frequency by the amplitude, and the results judged by this method have the problem that the damage characteristics are difficult to distinguish. Rail damage detection device and method based on negative tensor decomposition vibration characteristics

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  • Detection apparatus and method for steel rail failures based on characteristics of non-negative tensor resolution
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  • Detection apparatus and method for steel rail failures based on characteristics of non-negative tensor resolution

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specific Embodiment approach 1

[0022] Specific implementation mode one: combine figure 1 Describe this embodiment, a rail damage detection device based on non-negative tensor decomposition vibration characteristics, which includes a vibration acceleration sensor array 1, a signal conversion circuit 2, a signal feature extraction module 3, a damage matching module 4 and a damage discrimination module 5 , the acquisition signal output end of the vibration acceleration sensor array 1 arranged on the steel rail to be tested is connected to the signal input end of the signal conversion circuit 2, and the signal output end of the signal conversion circuit 2 is connected to the signal input end of the signal feature extraction module 3, and the signal The signal output terminal of the feature extraction module 3 is connected to the signal input terminal of the damage matching module 4 , and the signal output terminal of the damage matching module 4 is connected to the signal input terminal of the damage discriminat...

specific Embodiment approach 2

[0023] Specific implementation mode two: combination figure 2 Describe this embodiment, the specific steps of this embodiment are as follows:

[0024] Step 1: The vibration acceleration sensor array 1 collects the original vibration signal S(t) of the steel rail under test;

[0025] Step 2: the signal conversion circuit 2 converts the original vibration signal S(t) into a vibration signal x(t);

[0026] Step 3: Decompose the vibration signal x(t) by HHT to obtain the internal solid mode function (IMF) and residual of each order, denoted as: c 1 ,c 2 ,... c n And r, n is a natural number, and then the corresponding Hilbert transform is performed to obtain the amplitude-frequency signal h(w) between the frequency and the amplitude;

[0027] Step 4: Utilize HHT to analyze the amplitude-frequency signal h(w) between the obtained frequency amplitudes, and combine the corresponding measurement points and damage types to establish a three-dimensional tensor of damage signals;

...

specific Embodiment approach 3

[0029] Specific implementation mode three: combination image 3 To illustrate this embodiment, the sub-steps included in Step 3 of Embodiment 2 are as follows:

[0030] Sub-step 1, find out the maximum value and minimum value of x(t);

[0031] Sub-step 2, generate the local maximum value and local minimum value envelope of the signal respectively by the cubic spline interpolation method;

[0032] Sub-step 3, adding and averaging the local maximum envelope and the local minimum envelope of the signal to obtain the local envelope mean value m(t);

[0033] Sub-step 4. Subtract the local envelope mean from the signal: h(t)=x(t)-m(t), continue to perform the above screening process on h(t) several times until the two conditions of IMF are satisfied: Condition 1. In the whole function, the number of extreme points is equal to the number of crossing zero points, or the difference is only 1; Condition 2. At any time, the mean value of the envelope defined by the extreme envelope is ...

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Abstract

The invention provides a detection apparatus and method for steel rail failures based on the characteristics of non-negative tensor resolution and relates to a detection apparatus and method for failures of high-speed steel rails. The invention enables the problems that existing flaw detection technology judges failures with a frequency approaching a failing frequency merely through amplitude and has difficulty in distinguishing characteristics of the failures to be overcome. The detection apparatus for steel rail failures based on the characteristics of non-negative tensor resolution comprises a vibration accelerometer array, a signaling conversion circuit, a signal feature extraction module, a failure coupling module and a failure identifying module. The detection method comprises the following steps: step 1, acquiring original vibration signals of the steel rails; step 2, converting original signals into vibration signals; step 3, resolving the vibration signals by using HHT (Hilbert-Huang transform); step 4, establishing a three dimensional tensor of failure signals by using obtained amplitude-frequency signals among frequency amplitudes; step 5, resolving the established three dimensional tensor by using non-negative tensor resolution and extracting characteristic information. The invention is used for detection of failures of high-speed steel rails.

Description

technical field [0001] The invention relates to a detection device and method for railway rail damage, especially for detection of rail damage in high-speed railways. Background technique [0002] With the vigorous construction of my country's railway transportation, especially the rapid development of high-speed rail, the safety of railway transportation is becoming more and more important. Due to the limitation of damage detection speed, the traditional ultrasonic damage detection technology and mode cannot meet the flaw detection requirements of high-speed railway, and the research of new high-speed railway flaw detection technology is imminent. [0003] During the use of the rail, there will be breakage, cracks and other damage forms, that is, rail damage. There are many types of rail damage, the common ones are wear, peeling, rail head nuclear damage, rail waist screw hole cracks, etc. Rail damage is the main cause of broken rails and an important hidden danger affecti...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04G01N29/44
Inventor 王艳章欣冯乃章沈毅
Owner HARBIN INST OF TECH