CN105128888B - Track waveform abrasion method for quick based on many midpoint string synchro measures - Google Patents

Abstract

Track waveform abrasion method for quick based on many midpoint string synchro measures, including：It is determined that the method for the gauge head number and measurement chord length for detecting track ripple mill；The method of multiple gauge head data acquisitions；Track ripple mill value restored method based on many midpoint strings.The present invention can quickly detect the ability of track deviation based on existing rail checking instrument, transform the structure and detection algorithm of existing rail checking instrument, to obtain track ripple mill value, the method low cost, effect is good, measurement and resolving efficiency high, are adapted to the quick detection to undaform abrasion during track work is engaged in.

Description

Track waveform abrasion method for quick based on many midpoint string synchro measures

Technical field

Method for quick is worn away the present invention relates to a kind of track waveform based on the measurement of many strings, it directly applies to iron The detection of rail road regular maintenance medium wave shape wave abrasion.

Background technology

Rail waveform abrasion (referred to as " ripple mill ") are widely present in different kinds of railways track circuit, are produced when being locomotive operation Raw vibrations and the excitation source of noise, influence the service life of locomotive and the comfortableness of seating, train is also can result in when serious and is gone out Rail, causes the massive losses of lives and properties.Observed by the ripple mill to various tracks and measurement is shown that track ripple grinds presence Universal law：The ripple mill frequency of same place track is basically identical, and maintains certain mileage, and form is with sinusoidal or quasi sine Main, between 50mm-300mm, ripple grinds the initial stage to be formed must just be repaired wave-length coverage, otherwise will gradually be added with the time Speed deteriorates.Therefore, how the key issue that disease control is ground in detection as track ripple is carried out to ripple mill.

One of domestic and international detection method to rail corrugation is inertia method, using the inertial reference of accelerometer, by right The large-scale rail inspection train axle box acceleration signal for obtaining carries out quadratic integral and obtains irregularity value, such as：Britain RCA ripples mill analysis car, China rail undulatory wear dynamic detection system RCIU-1 that Railmeasurement companies develop etc.. The accuracy of detection of the method can reach micron order, but its equipment cost is very high, in the daily manual inspection of track less It is applicable.Another more common detection method is straight chi, such as HYGP-3 rail flatness measuring instruments.The letter of its measuring principle It is single, but operator's labour intensity is big and measurement efficiency is low.

At present, the track geometry measuring trolley based on midpoint string is widely used in each railway construction section, can realize track The continuously and quickly measuring of geometry state, its general principle sees below formula：

Wherein Δ is measured value, and L represents the measurement chord length of travelling wheel composition after Plantago minuta, and F (X) represents track irregularity letter Number.Midpoint string surveys method an intrinsic defect, i.e., when even-multiples of the L for F (X) wavelength, Δ measured value is 0, it is impossible to completed The test assignment of expectation, therefore such dolly is mainly used in measurement F (X) longer wavelengths of track geometry status, that is to say, that base The shorter track ripple mill of F (X) wavelength can not be accurately measured by principle is limited in the track geometry measuring trolley of midpoint string.In view of track Ripple grinds the importance of disease, and exploratory development is a kind of quick, low cost, and accurate railroad track ripple mill detection method is both several railway What theoretic innovation of state-detection, is also requirement of engineering.

The content of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, proposes the track waveform based on many midpoint string synchro measures Abrasion method for quick.

The present invention is achieved by the following technical solutions.

(1) n is symmetrically added to synchronous gauge head in existing track geometry measuring trolley measurement string midpoint gauge head both sides, each gauge head Raceway surface can be simultaneously contacted, track geometry measuring trolley " front and rear travelling wheel+midpoint gauge head " constitutes main string, " every a pair synchronous surveys Head+midpoint gauge head " constitutes one group of synchronous string；

The midpoint gauge head and the n of addition trigger sampling to synchronous gauge head using same signal, realize the synchronization of each gauge head Measurement.

(2) determine synchronous gauge head to quantity n and each other apart from L_i：

According to many midpoint string amplitude-frequency response functions (such as following formula)

Calculate λ to change between 50mm-300mm, select different n values and L_iThe H obtained during value_n(ω) sequence x_jSide Difference S², computing formula such as following formula：

N represents the quantity of the synchronous gauge head pair of addition in formula (a), and λ represents the wavelength of track ripple mill, L_iRepresent i-th pair synchronization Length between gauge head, L₀Length before and after representing between travelling wheel；S in formula (b)²Represent H_nThe variance yields of (ω) sequence, x_jTable Show H_nThe calculated value of jth point in (ω) sequence, x represents H_nIn (ω) sequence average a little, k represents gained H_n(ω) sequence Total length.

To the different n values and L that obtain_iS during value²It is analyzed, takes S²N values when minimum, L₀Value and L_iValue is used as addition The length between length and i-th pair synchronization gauge head between the quantity of synchronous gauge head pair, front and rear travelling wheel.

(3) track ripple mill amplitude is calculated

Main string and each synchronous string are added in the measured value of same orbit measurement point, many midpoint string measured value sum sequences are obtained Σ(X).MODELSRationale, when track ripple grinding tool has wavelength X, many midpoint string measured value sum sequence Σ are surveyed according to midpoint string (X) equally there is wavelength X, wavelength X can be found out with mathematic(al) manipulation to Σ (X) sequences；The mathematic(al) manipulation includes wavelet transformation, The accelerating algorithm of Fourier transform, singular value decomposition, empirical mode decomposition and the above method.

The length L between the front and rear travelling wheel for determining₀, the synchronous gauge head pair of addition quantity n, i between synchronous gauge head Length L_i, the track ripple that is calculated by mathematic(al) manipulation grind wavelength X, bring (a) formula into and obtain H_nThe unique value б of (ω), sequence Each value in row Σ (X) can then calculate the amplitude of current orbit ripple mill divided by б.

Algorithm of the present invention is to calculate automatically, or manual calculations.

The present invention with the addition of multipair synchronous gauge head to realize to track on the basis of the technical scheme of existing rail checking instrument Ripple mill quick measurement, the method overcome existing track geometry measuring trolley can not accurately detect track ripple mill defect, measurement with Efficiency high is resolved, is adapted to the discovery of railroad track ripple mill disease and the routine servicing of track irregularity.

Brief description of the drawings

Fig. 1 is track geometry measuring trolley gauge head installation diagram；

In figure:1 is 1 pair of synchronous gauge head, 2 for before and after travelling wheel, 3 is midpoint side head, and 4 is track geometry measuring trolley, 5 be with The track of waveform abrasion；

Fig. 2 is the algorithm flow that the track waveform based on many midpoint string synchro measures wears away method for quick.

Specific embodiment

The present invention will be described further by following examples combination accompanying drawing 1.

A pair of synchronizations gauge head 1, i.e. n=1 are added in the both sides of 4 midpoint gauge head of track geometry measuring trolley 3, then can be obtained according to formula (a) Double midpoints string amplitude-frequency response function (c) formed after to a pair synchronous gauge heads of addition.

H₁(ω)=2-cos (π L₀/λ)-cos(πL₁/λ) (c)

L is changed according to formula (c)₀And L₁Value be calculated H₁When (ω) changes between wavelength X is 50mm-300mm Sequence, their variance S is calculated to each group receptance function sequence with formula (b)², take S²L when minimum₁The conduct of=667mm values adds Plus a pair synchronous gauge heads 1 between length；L₀The main chord length that=750mm values are constituted as front and rear travelling wheel 2；Using adding Add double midpoint string track geometry measuring trolleys 4 of a pair synchronous gauge heads to carry out measurement on the track 5 worn away with waveform, obtained Double midpoint string measured values sum sequence Σ (X) of actual measurement track ripple mill, carry out mathematic(al) manipulation and obtain its wavelength X to Σ (X).According to true Fixed n, L₀, L₁, current orbit ripple mill wavelength X brings (c) into and is calculated H₁The unique value б of (ω), every in Σ (X) sequence Individual value can calculate the amplitude of current orbit ripple mill divided by б.

Claims (3)

1. a kind of track waveform based on many midpoint string synchro measures wears away method for quick, it is characterized in that:

(1) n is symmetrically added to synchronous gauge head in existing track geometry measuring trolley measurement string midpoint gauge head both sides, each gauge head can Raceway surface is contacted simultaneously；Track geometry measuring trolley " front and rear travelling wheel+midpoint gauge head " constitutes main string, " every a pair of synchronizations gauge head+in The synchronous string of one group of composition of point gauge head "；

(2) determine synchronous gauge head to quantity n and each other apart from L_i：

According to many midpoint string amplitude-frequency response functions

$H_n\left(\mathrm{\ω}\right)=(1-cos({\mathrm{\πL}}_0/\mathrm{\λ}\left)\right)+\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 S², Computing formula such as following formula：

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

N represents the quantity of the synchronous gauge head pair of addition in formula (a), and λ represents the wavelength of track ripple mill, L_iRepresent i-th pair synchronization gauge head it Between length, L₀Length before and after representing between travelling wheel；S in formula (b)²Represent H_nThe variance yields of (ω) sequence, x_jRepresent H_n The calculated value of jth point in (ω) sequence, x represents H_nIn (ω) sequence average a little, k represents gained H_n(ω) sequence it is total Length；

To the different n values and L that obtain_iS during value²It is analyzed, takes S²N values when minimum, L₀Value and L_iValue is synchronous as addition The length between length and i-th pair synchronization gauge head between the quantity of gauge head pair, front and rear travelling wheel；

(3) track ripple mill amplitude is calculated

Main string and each synchronous string are added in the measured value of same orbit measurement point, many midpoint string measured value sum sequence Σ are obtained (X)；MODELSRationale, when track ripple grinding tool has wavelength X, many midpoint string measured values sum sequence Σ (X) are surveyed according to midpoint string Equally there is wavelength X, wavelength X can be found out with mathematic(al) manipulation to Σ (X) sequences；

The length L between the front and rear travelling wheel for determining₀, each synchronous gauge head pair number n, between each synchronization gauge head to synchronous string Length L_i, the track ripple that is calculated by mathematic(al) manipulation grind wavelength X, bring (a) formula into and obtain H_nThe unique value б of (ω), sequence Each value in row Σ (X) can then calculate the amplitude of current orbit ripple mill divided by б.

2. the track waveform based on many midpoint string synchro measures according to claim 1 wears away method for quick, its It is characterized in:The midpoint gauge head and the n of addition trigger sampling to synchronous gauge head using same signal, realize the same pacing of each gauge head Amount.

3. the track waveform based on many midpoint string synchro measures according to claim 1 wears away method for quick, its It is characterized in:The mathematic(al) manipulation includes wavelet transformation, Fourier transform, singular value decomposition, empirical mode decomposition and above-mentioned side The accelerating algorithm of method.