CN105128888A - Track corrugated abrasion quick detection method based on multi-midpoint chord synchronous measurement - Google Patents

Abstract

The invention relates to a track corrugated abrasion quick detection method based on multi-midpoint chord synchronous measurement. The track corrugated abrasion quick detection method comprises a method for detecting the number of measuring heads used for detecting track corrugated abrasion and measuring the chord length, a method for collecting data of the multiple measuring heads and a track corrugated abrasion value restore method based on multi-midpoint chords. By means of the track corrugated abrasion quick detection method, based on the capability that an existing track detecting instrument can quickly detect the deviation of a track, the structure of the existing track detecting instrument and a detecting algorithm are transformed so as to obtain the track corrugated abrasion value, and the method is low in cost, good in effect, high in measuring and resolving efficiency and suitable for quick detection of corrugated abrasion in track public services.

Description

Based on the track waveform abrasion method for quick of many mid points string synchro measure

Technical field

The present invention relates to a kind of track waveform abrasion method for quick measured based on many strings, it directly applies to the detection of railroad track daily attention medium wave shape wave abrasion.

Background technology

Rail waveform abrasion (being called for short " ripple mill ") are extensively present in different kinds of railways track circuit, the excitation source of vibrations and noise is produced when being locomotive operation, the service life affecting locomotive and the traveling comfort taken, also may cause train derailment time serious, cause the massive losses of lives and properties.By to observe the ripple of various track mill and measurement shows that track ripple mill also exists universal law: the ripple mill frequency of same place track is basically identical, and maintain certain mileage, form is based on sinusoidal or quasi sine, range of wavelength is between 50mm-300mm, the initial stage that ripple mill is formed just must be repaired, otherwise will accelerate gradually in time to worsen.Therefore, how the key issue becoming the disease control of track ripple mill is detected to ripple mill.

One of domestic and international method of inspection to rail corrugation is inertia method, utilize the inertial reference of accelerometer, irregularity value is obtained by carrying out quadratic integral to the large-scale rail inspection train axle box acceleration signal obtained, as: the RCA ripple mill of Railmeasurement company of Britain development analyzes car, China rail undulatory wear dynamic detection system RCIU-1 etc.The most high energy of accuracy of detection of the method reaches micron order, but its equipment cost is very high, not too applicable in the daily manual inspection of track.Another kind of more common method of inspection is straight chi, as HYGP-3 rail flatness measuring instrument etc.Its principle of measurement is simple, but operator's labour intensity is large and measure inefficiency.

At present, the track geometry measuring trolley based on mid point string is widely used at each railway construction section, can realize the continuously and quickly measuring of track geometry status, and its groundwork is shown in following formula:

$\mathrm{\Δ}=\frac{F(X-\frac{L}{2})+F(X+\frac{L}{2})}{2}-F\left(X\right)$

Wherein Δ is observed reading, and the measurement chord length that after L represents Plantago minuta, walking wheel is formed, F (X) represents track irregularity function.Mid point string survey method has an intrinsic defect, namely when L is the even-multiple of F (X) wavelength, Δ observed reading is 0, the test assignment of expectation can not be completed, therefore such dolly is mainly used in measuring the longer track geometry status of F (X) wavelength, that is, based on mid point string track geometry measuring trolley due to principle limit can not Measurement accuracy F (X) wavelength shorter track ripple mill.In view of the importance of track ripple mill disease, exploratory development is fast a kind of, low cost, and railroad track ripple mill method of inspection is the theoretic innovation of railway geometry state-detection accurately, is also requirement of engineering.

Summary of the invention

The object of the invention is to overcome the deficiencies in the prior art, propose the track waveform abrasion method for quick based on many mid points string synchro measure.

The present invention is achieved by the following technical solutions.

(1) measure string mid point gauge head bilateral symmetry at existing track geometry measuring trolley and add n to synchronous gauge head, each gauge head can contact raceway surface simultaneously.Track geometry measuring trolley " front and back walking wheel+mid point gauge head " form main string, " every a pair synchronous gauge head+mid point gauge head " forms one group of synchronous string.

The n of described mid point gauge head and interpolation adopts same signal to trigger sampling to synchronous gauge head, realizes the synchro measure of each gauge head.

(2) determine that gauge head is to quantity n and distance L each other _i:

According to many mid points string amplitude-frequency response function (as shown in the formula)

$H_n\left(\mathrm{\ω}\right)=(1-cos({\mathrm{\πL}}_0/\mathrm{\λ}))+\underset{i=1}{\overset{n}{\Σ}}\[1-cos({\mathrm{\πL}}_i/\mathrm{\λ})\]---\left(a\right)$

Calculate λ to change between 50mm-300mm, select different n values and L _ithe H obtained during value _n(ω) sequence x _jvariance S ², computing formula as shown in the formula:

$S^2=\frac{\underset{j=1}{\overset{k}{\Σ}}{(x_j-x)}^2}{k}---\left(b\right)$

In formula (a), n represents the quantity that the synchronous gauge head of interpolation is right, and λ represents the wavelength that track ripple grinds, L _irepresent that i-th to the length between synchronous gauge head, L ₀length before and after representing between walking wheel.S in formula (b) ²represent H _n(ω) variance yields of sequence, x _jrepresent H _n(ω) computing value of jth point in sequence, x represents H _n(ω) in sequence average a little, k represents gained H _n(ω) total length of sequence.

To the different n value obtained and L _is during value ²analyze, get S ²n value time minimum, L ₀value and L _ibe worth as the length and i-th between the quantity of adding gauge head, front and back walking wheel the length between synchronous gauge head.

(3) track ripple mill amplitude calculates

Main string and each synchronous string are added in the observed reading of same orbit measurement point, obtain many mid points string measured value sum sequence Σ (X).Survey MODELSRationale according to mid point string, when track ripple grinding tool has wavelength X, many mid points string measured value sum sequence Σ (X) has wavelength X equally, uses mathematic(al) manipulation to find out wavelength X to Σ (X).Described mathematic(al) manipulation comprises wavelet transformation, Fourier transform, svd, the accelerating algorithm of empirical mode decomposition and said method.

The length L between the front and back walking wheel determined ₀, add the right quantity n of synchronous gauge head, i is to the length L between synchronous gauge head _i, the track ripple mill wavelength X to be calculated by mathematic(al) manipulation, (a) formula of bringing into obtains H _n(ω) unique value б, then can calculate each value in many mid points string measured value sum sequence Σ (X) amplitude of current orbit ripple mill divided by б.

Algorithm of the present invention is automatic calculating, or manual calculations.

The present invention with the addition of multipair synchronous gauge head to realize the Quick Measurement to track ripple mill on the technical scheme basis of existing rail checking instrument, the method overcome the defect that existing track geometry measuring trolley accurately can not detect track ripple mill, measure with to resolve efficiency high, be applicable to the mill discovery of disease of railroad track ripple and the routine servicing of track irregularity.

Accompanying drawing explanation

Fig. 1 is track geometry measuring trolley gauge head erection plan;

In figure: 1 is 1 to synchronous gauge head, and 2 is front and back walking wheel, and 3 is mid point side head, and 4 is track geometry measuring trolley, 5 for having the track of waveform abrasion;

Fig. 2 is the algorithm flow of the track waveform abrasion method for quick based on many mid points string synchro measure.

Detailed description of the invention

The present invention 1 will be described further by reference to the accompanying drawings by following examples.

A pair synchronous gauge head 1, i.e. n=1 is added, then two mid points string amplitude-frequency response function (c) formed after can obtaining interpolation a pair synchronous gauge head according to formula (a) in track geometry measuring trolley 4 mid point gauge head 3 both sides.

H ₁(ω)＝2-cos(πL ₀/λ)-cos(πL ₁/λ)(c)

L is changed according to formula (c) ₀and L ₁value calculate H ₁(ω) wavelength X be change between 50mm-300mm time sequence, use formula (b) to calculate their variance S to each group of response function sequence ², get S ²l time minimum ₁=667mm value is as the length between a pair synchronous gauge head 1 added; L ₀the main chord length that=750mm value is formed as front and back walking wheel 2.The two mid point string track geometry measuring trolleys 4 that with the addition of a pair synchronous gauge head are used to carry out measuring on the track 5 with waveform abrasion, obtain two mid point string measured values sum sequence Σ (X) of actual measurement track ripple mill, mathematic(al) manipulation is carried out to Σ (X) and obtains its wavelength X.According to the n determined, L ₀, L ₁, current orbit ripple mill wavelength X is brought (c) into and is calculated H ₁(ω) unique value б, can calculate each value in two mid point string measured value sum Σ (X) sequence divided by б the amplitude of current orbit ripple mill.

Claims (3)

1., based on a track waveform abrasion method for quick for many mid points string synchro measure, it is characterized in that:

(1) measure string mid point gauge head bilateral symmetry at existing track geometry measuring trolley and add n to gauge head, each gauge head can contact raceway surface simultaneously; Track geometry measuring trolley " front and back walking wheel+mid point gauge head " form main string, " every a pair synchronous gauge head+mid point gauge head " forms one group of synchronous string;

(2) determine that gauge head is to quantity n and distance L each other _i:

According to many mid points string amplitude-frequency response function (as shown in the formula)

$H_n\left(\mathrm{\ω}\right)=(1-cos({\mathrm{\πL}}_0/\mathrm{\λ}))+\underset{i=1}{\overset{n}{\Σ}}\[1-cos({\mathrm{\πL}}_i/\mathrm{\λ})\]---\left(a\right)$

Calculate λ to change between 50mm-300mm, select different n values and L _ithe H obtained during value _n(ω) sequence x _jvariance S ², computing formula as shown in the formula:

$S^2=\frac{\underset{j=1}{\overset{k}{\Σ}}{(x_j-x)}^2}{k}---\left(b\right)$

In formula (a), n represents the quantity that the synchronous gauge head of interpolation is right, and λ represents the wavelength that track ripple grinds, L _irepresent that i-th to the length between synchronous gauge head, L ₀length before and after representing between walking wheel; S in formula (b) ²represent H _n(ω) variance yields of sequence, x _jrepresent H _n(ω) computing value of jth point in sequence, x represents H _n(ω) in sequence average a little, k represents gained H _n(ω) total length of sequence;

To the different n value obtained and L _is during value ²analyze, get S ²n value time minimum, L ₀value and L _ibe worth as the length and i-th between the quantity of adding gauge head, front and back walking wheel the length between synchronous gauge head.

(3) track ripple mill amplitude calculates

Main string and each synchronous string are added in the observed reading of same orbit measurement point, obtain many mid points string measured value sum sequence Σ (X), MODELSRationale is surveyed according to mid point string, when track ripple grinding tool has wavelength X, many mid points string measured value sum sequence Σ (X) has wavelength X equally; Mathematic(al) manipulation is used to find out wavelength X to Σ (X);

The length L between the front and back walking wheel determined ₀, each synchronous string number n, each to the length L between the synchronous gauge head of synchronous string _i, the track ripple mill wavelength X to be calculated by mathematic(al) manipulation, (a) formula of bringing into obtains H _n(ω) unique value б, then can calculate each value in many mid points string measured value sum sequence Σ (X) amplitude of current orbit ripple mill divided by б.

2. the abrasion of the track waveform based on many mid points string synchro measure method for quick according to claim 1, is characterized in that: the n of described mid point gauge head and interpolation adopts same signal to trigger sampling to synchronous gauge head, realizes the synchro measure of each gauge head.

3. the abrasion of the track waveform based on many mid points string synchro measure method for quick according to claim 1, it is characterized in that: described mathematic(al) manipulation comprises wavelet transformation, Fourier transform, svd, the accelerating algorithm of empirical mode decomposition and said method.