CN102914364A - Dynamic identifying method for instant contact loss of wheel rail under impact effect of wheel rail - Google Patents

Dynamic identifying method for instant contact loss of wheel rail under impact effect of wheel rail Download PDF

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Publication number
CN102914364A
CN102914364A CN2012103996208A CN201210399620A CN102914364A CN 102914364 A CN102914364 A CN 102914364A CN 2012103996208 A CN2012103996208 A CN 2012103996208A CN 201210399620 A CN201210399620 A CN 201210399620A CN 102914364 A CN102914364 A CN 102914364A
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China
Prior art keywords
frequency
time
wheel
vibration acceleration
wheel rail
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Application number
CN2012103996208A
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Chinese (zh)
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CN102914364B (en
Inventor
林建辉
丁建明
伍川辉
刘璐
易彩
陈春俊
张兵
苏燕辰
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西南交通大学
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Abstract

The invention discloses a dynamic identifying method for instant contact loss of a wheel rail under an impact effect of the wheel rail and belongs to a traffic information safety technology. The dynamic identifying method comprises the following steps: firstly, mounting a vibration acceleration sensor above a wheel axle box; collecting axle box vibration acceleration information measured by the vibration acceleration sensor through a background collector; extracting a time-frequency feature for the axle box vibration acceleration, thereby obtaining a time-frequency distribution feature; and drawing a contour map for the time-frequency distribution feature and judging if the wheel rail instantly loses the contact. According to the scheme, the purpose of immediately detecting the ultra-large hidden danger of the instant contact loss of the wheel rail under the impact effect of the wheel rail is achieved according to the dynamic identifying method provided by the invention; the possibility of derailing of a vehicle is eliminated; the technology is mature; the reliability is high; the cost is low; the quantity of the channels is less; the system is simple; the anti-interference property is high; and the social and economical benefits are very obvious.

Description

A kind ofly because causing wheel track moment, the wheel-rail impact effect loses the dynamic identifying method of contact
Technical field
The invention belongs to traffic and transport field, specifically, relate to and a kind ofly lose the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment.
Background technology
In the process, during wheel brake hard locking, if when wheel exists the soft objects such as ice and snow, leaf to move at Rail Surface, the rotation of wheel motion is become by rolling slides or the motion of trackslipping rolling stock under arms, and wheel track will produce sliding friction.For relative rolling friction, sliding friction is violent, and violent sliding friction produces high temperature so that wheel tread occurs abrading, peels off, rhegma and fall the wheel defective such as piece, and these defectives are brought strike and the injury of intermittence to wheel rail system.Existing theoretical calculation and test test shows, having the wheel-rail impact power of the wheel generation of defective is the several times of wheel track static load, wherein HFS directly has a negative impact to track and wheel, thereby reduce vehicle and circuit serviceable life, increase energy consumption and improve maintenance cost, serious is cause axle temperature to raise axletree occurring fervent; Accelerate on the other hand axletree, the tread Crack Extension causes the axletree cold cut.What pay particular attention to simultaneously is, when the rolling stock travelling speed reaches certain value, when flaw size reaches certain value, wheel-rail impact can cause that later wheel track moment loses contact, some meetings make wheel track repeatedly intermittence lose contact, wheel track loses contact and means that the vertical acting force of wheel track is zero, moment derailment coefficients be infinity, the derailing that the highway section that has large transverse force such as fast running at bend circuit, track Ultrahigh Bypass etc., vehicle occur may be very large.
Summary of the invention
The object of the invention is to lose the especially big hidden danger of contact because wheel-rail impact causes wheel track moment, provide a kind of and lose the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment, the possibility of avoiding vehicle that derailing occurs occurs.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind ofly lose the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment, realize by the following method:
(1) vibration acceleration sensor is installed on wheel axle box top, and gathers the axle box vibration acceleration information that vibration acceleration sensor measures by the collector on backstage;
(2) axle box vibration acceleration information is carried out time-frequency characteristics and extract, obtain the time-frequency distributions feature;
(3) contour map of drafting time-frequency distributions feature judges whether moment loses contact to wheel track.
In order to guarantee the accurate measurement of vibration acceleration sensor, the range of vibration acceleration sensor is ± 50g that frequency response is not less than 2kHz, and the sample frequency of collector is not less than 10kHz in the described step (1).
Further obtain the video distribution feature, the specific implementation step of described step (2) is as follows:
(2a) select frequency slice function, wherein frequency coordinate , The centre frequency of expression conversion, The expression frequency resolution, Expression departs from the number of the resolution of centre frequency, so the basis function of frequency choice function is:
According to Size, the frequency choice function calculates the following three kinds of situations that comprise:
Situation one: when And The time, the frequency choice function For:
And
Situation two: when And The time, the frequency choice function For:
And
Situation three: when And The time, the frequency choice function For:
And
Wherein, Be the frequency discrimination factor, Centered by coordinate corresponding to frequency, satisfy
(2b) the axle box vibration acceleration is carried out Fourier transform, transformation for mula is as follows:
(2c) the frequency slice function is selected the frequency of Fourier, selects formula as follows:
(2d) carry out the time-frequency distributions feature that inverse-Fourier transform obtains vibration acceleration for various centre frequencies:
In order better to realize the present invention, the concrete methods of realizing of described step (3) is as follows:
(3a) contour map of the time-frequency distributions feature of drafting vibration acceleration;
(3b) seek this contour time period corresponding to line chart maximum energy peak value;
(3c) seek successively second largest energy peak in the time period at ceiling capacity, if local energy occurs with the decay that frequency increases in the section at one time, then exist wheel track that the phenomenon that breaks away from occurs.
The present invention compares than prior art, has the following advantages and beneficial effect:
(1) the invention solves a most important problem of present stage, namely how to judge because the wheel-rail impact effect causes its moment and lose contact, avoided a kind of the most abominable factor that endangers vehicle operating safety of bringing because of wheel fault, because the method that can not address the aforementioned drawbacks at present, therefore the present invention is as important breakthrough in this area, thoroughly changed this sky window, because wheel track loses with wheel suddenly and contacts, the harm that brings is immeasurable, therefore the present invention is a new technology, has thoroughly solved this harm.
(2) recognition methods of the present invention is very simple, only need vibration acceleration sensor and the collector of a passage namely to collect information needed, and by calculating, feature extraction, relatively can recognize immediately the phenomenon that this instantaneous wheel and wheel track break away from, have real-time, and process is very simple; Simultaneously the present invention does not need to transform circuit, can carry out system-wide and cover and detect, and reliability is high, easily fill easy care, can satisfy the needs that wheel moment loses the Dynamic Recognition of contact fully.
(3) the present invention has advance and superiority owing to being a brand-new technology, and technology maturation, reliability are high, and good prospect and application market are arranged.
Description of drawings
Fig. 1 is realization flow figure of the present invention.
Fig. 2 is vibration acceleration sensor installation site schematic diagram among the present invention-embodiment.
Fig. 3 is acceleration and the time-frequency characteristics figure thereof when picking rate is 150km/h among the present invention-embodiment.
Fig. 4 is acceleration and the time-frequency characteristics figure thereof when picking rate is 130km/h among the present invention-embodiment.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment, and embodiments of the present invention include but not limited to the following example.
Embodiment 1
As shown in Figure 1, at axle box acceleration transducer has been installed among the present invention, has been used for the dynamic vibration information of Dynamic Acquisition locomotive vehicle-mounted under wheel fault, and done real-time detection computations on the backstage.
As shown in Figure 1, performing step of the present invention is as follows:
(1) vibration acceleration sensor is installed on the axle box
The installation of sensors orientation as shown in Figure 2, wherein the range of vibration transducer is selected in ± 50g, frequency response is not less than 2000Hz, the sample frequency of pick-up transducers is not less than 10kHz, and obtains acceleration signal
Wherein shown in Fig. 3 (a) and Fig. 4 top are divided, collect one group of axle box Vertical Acceleration signal that contains wheel fault, the speed of collection signal is 150km/h and 130km/h, and corresponding frequecy characteristic and same time peak energy are respectively shown in Fig. 3 (b) and Fig. 4 bottom are divided.
(2) carry out the temporal frequency signature analysis
Applying frequency section wavelet transformation carries out time-frequency characteristics to the axle box vibration acceleration and extracts, and the detailed step of feature extraction is as follows:
The first step: the selection of frequency slice function and realization
Frequency coordinate is set , wherein The centre frequency of expression conversion, The expression frequency resolution, Expression departs from the number of the resolution of centre frequency.
The basis function of frequency choice function is described as:
Then calculate the predominant frequency choice function.
(1a) when And The time, frequency is selected choice function For:
Wherein And
(1b) when And The time, frequency is selected choice function For:
Wherein And
(1c) when And The time, the frequency choice function For:
Wherein And
In the above-mentioned formula, Be the frequency discrimination factor, Centered by coordinate corresponding to frequency, satisfy
Second step: the fast fourier transform that the axle box vibration is accelerated:
The 3rd step: the frequency slice function is selected the frequency of Fourier:
The 4th step: carry out the time-frequency distributions feature that inverse-Fourier transform obtains vibration acceleration for different center frequency:
(3) judge that wheel track moment loses the identification of contact
The first step: the contour map of drawing the time-frequency distributions of vibration signal;
Second step: the corresponding time period of seeking maximum energy peak value;
The 3rd section: seek successively other times maximum energy peak value in the time period at ceiling capacity, if local energy occurs with the decay that frequency increases in the section at one time, namely exist wheel track that the phenomenon that breaks away from occurs.
According to above-described embodiment, just can realize well the present invention.

Claims (4)

1. one kind loses the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment, it is characterized in that, realizes by the following method:
(1) vibration acceleration sensor is installed on wheel axle box top, and gathers the axle box vibration acceleration information that vibration acceleration sensor measures by the collector on backstage;
(2) axle box vibration acceleration information is carried out time-frequency characteristics and extract, obtain the time-frequency distributions feature;
(3) contour map of drafting time-frequency distributions feature judges whether moment loses contact to wheel track.
2. according to claim 1ly a kind ofly because causing wheel track moment, the wheel-rail impact effect loses the dynamic identifying method of contact, it is characterized in that, the range of vibration acceleration sensor is ± 50g in the described step (1), frequency response is not less than 2kHz, and the sample frequency of collector is not less than 10kHz.
3. according to claim 2ly a kind ofly lose the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment, it is characterized in that, the specific implementation step of described step (2) is as follows:
(2a) select frequency slice function, wherein frequency coordinate , The centre frequency of expression conversion, The expression frequency resolution, Expression departs from the number of the resolution of centre frequency, so the basis function of frequency choice function is:
According to Size, the frequency choice function calculates the following three kinds of situations that comprise:
Situation one: when And The time, the frequency choice function For:
And
Situation two: when And The time, the frequency choice function For:
And
Situation three: when And The time, the frequency choice function For:
And
Wherein, Be the frequency discrimination factor, Centered by coordinate corresponding to frequency, satisfy
(2b) the axle box vibration acceleration is carried out Fourier transform, transformation for mula is as follows:
(2c) the frequency slice function is selected the frequency of Fourier, selects formula as follows:
(2d) carry out the time-frequency distributions feature that inverse-Fourier transform obtains vibration acceleration for various centre frequencies:
4. according to claim 3ly a kind ofly lose the dynamic identifying method of contact because the wheel-rail impact effect causes wheel track moment, it is characterized in that, the concrete methods of realizing of described step (3) is as follows:
(3a) contour map of the time-frequency distributions feature of drafting vibration acceleration;
(3b) seek this contour time period corresponding to line chart maximum energy peak value;
(3c) seek successively second largest energy peak in the time period at ceiling capacity, if local energy occurs with the decay that frequency increases in the section at one time, then exist wheel track that the phenomenon that breaks away from occurs.
CN201210399620.8A 2012-10-19 2012-10-19 Dynamic identifying method for instant contact loss of wheel rail under impact effect of wheel rail CN102914364B (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104777054A (en) * 2015-05-18 2015-07-15 浙江工业大学 Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology
CN107521511A (en) * 2017-08-18 2017-12-29 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment alarm
CN107521520A (en) * 2017-08-18 2017-12-29 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment early warning
CN108290585A (en) * 2015-11-11 2018-07-17 克诺尔轨道车辆系统有限公司 For to compare the method and apparatus of control mode detection derailing
CN108749849A (en) * 2018-06-05 2018-11-06 唐智科技湖南发展有限公司 A kind of wheel derailment method for early warning, apparatus and system
CN110207810A (en) * 2018-02-28 2019-09-06 常州路航轨道交通科技有限公司 Axle box vibration detecting system
CN110740920A (en) * 2017-06-02 2020-01-31 曙制动器工业株式会社 Derailment sign detection system, control device, derailment sign detection method, and derailment sign detection program

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CN1787941A (en) * 2003-05-15 2006-06-14 西门子运输系统有限公司 Detection of derailment by determining the rate of fall
CN101668672A (en) * 2007-04-27 2010-03-10 株式会社普利司通 Tire grounding state estimating method, tire grounding state estimating device, and grounding state estimating tire
CN102173299A (en) * 2011-01-21 2011-09-07 合肥安迅铁道应用技术有限公司 Positioning monitoring and managing system for mobile derailer
CN102706568A (en) * 2012-05-22 2012-10-03 西南交通大学 Portable train vibration tester

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1787941A (en) * 2003-05-15 2006-06-14 西门子运输系统有限公司 Detection of derailment by determining the rate of fall
CN101668672A (en) * 2007-04-27 2010-03-10 株式会社普利司通 Tire grounding state estimating method, tire grounding state estimating device, and grounding state estimating tire
CN102173299A (en) * 2011-01-21 2011-09-07 合肥安迅铁道应用技术有限公司 Positioning monitoring and managing system for mobile derailer
CN102706568A (en) * 2012-05-22 2012-10-03 西南交通大学 Portable train vibration tester

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104777054A (en) * 2015-05-18 2015-07-15 浙江工业大学 Method for identifying parameters of resonant fatigue crack propagation test vibration system based on soft sensing technology
CN108290585A (en) * 2015-11-11 2018-07-17 克诺尔轨道车辆系统有限公司 For to compare the method and apparatus of control mode detection derailing
CN110740920A (en) * 2017-06-02 2020-01-31 曙制动器工业株式会社 Derailment sign detection system, control device, derailment sign detection method, and derailment sign detection program
CN107521511A (en) * 2017-08-18 2017-12-29 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment alarm
CN107521520A (en) * 2017-08-18 2017-12-29 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment early warning
CN107521520B (en) * 2017-08-18 2019-04-05 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment early warning
CN107521511B (en) * 2017-08-18 2019-06-21 唐智科技湖南发展有限公司 A kind of method and system of wheel derailment alarm
CN110207810A (en) * 2018-02-28 2019-09-06 常州路航轨道交通科技有限公司 Axle box vibration detecting system
CN108749849A (en) * 2018-06-05 2018-11-06 唐智科技湖南发展有限公司 A kind of wheel derailment method for early warning, apparatus and system
CN108749849B (en) * 2018-06-05 2020-01-10 唐智科技湖南发展有限公司 Wheel derailment early warning method, device and system

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