CN113847958A - Steel rail locking rail temperature detection method based on vibration mode - Google Patents
Steel rail locking rail temperature detection method based on vibration mode Download PDFInfo
- Publication number
- CN113847958A CN113847958A CN202111137806.1A CN202111137806A CN113847958A CN 113847958 A CN113847958 A CN 113847958A CN 202111137806 A CN202111137806 A CN 202111137806A CN 113847958 A CN113847958 A CN 113847958A
- Authority
- CN
- China
- Prior art keywords
- rail
- steel rail
- temperature
- data
- steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 58
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 11
- 230000005284 excitation Effects 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 4
- 238000012935 Averaging Methods 0.000 claims description 3
- 238000013016 damping Methods 0.000 claims description 3
- 238000004148 unit process Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 238000009529 body temperature measurement Methods 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 description 10
- 238000009792 diffusion process Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
A rail locking rail temperature detection method based on vibration mode belongs to the technical field of rail state detection, and comprises the following steps: firstly, arranging a temperature sensor and a vibration sensor on a steel rail; step two, acquiring force hammer signals and performing correlation comparison on the acquired modal data; thirdly, collecting vibration modes and force hammer excitation signals and transmitting the signals to a man-machine processing unit; processing data to obtain frequency data; screening the obtained frequency data; step six, obtaining the longitudinal force of the steel rail; and seventhly, calculating the locking rail temperature according to the relation between the locking rail temperature and the longitudinal force of the steel rail. The method comprises the steps of measuring the vibration mode of the steel rail and the temperature of the steel rail, selecting a plurality of natural frequencies by utilizing the approximate linear relation between the longitudinal force of the steel rail and the natural frequency of the steel rail, and comprehensively calculating the longitudinal force of the steel rail. The rail temperature measurement can be directly realized by the relationship between the longitudinal force of the steel rail and the temperature without external input conditions.
Description
Technical Field
The invention belongs to the technical field of railway steel rail state detection, and particularly relates to a vibration mode-based steel rail locking rail temperature detection method.
Background
Along with the laying of a large amount of seamless track steel rails of a railway, the influence of longitudinal force on the steel rails is increasingly large, so that the rail locking temperature is an important index for measuring the state of the steel rails of the railway, and the problem that how to quickly and conveniently detect the rail locking temperature of the steel rails is always troubling railway engineering departments is solved. At present, aiming at a locking rail temperature detection scheme: 1. the pile observation method realizes the measurement of the locking rail temperature; 2. the stress diffusion method realizes the measurement of the locked rail temperature; 3. and the locking rail temperature measurement is realized by an ultrasonic detection method. The observation pile method has the following disadvantages: 1) the observation error is larger by adopting manual observation in the pile observation method; 2) the observation pile method can only observe the average locking rail temperature in the section and cannot realize the observation of the stress concentration point; 3) the observation pile method needs to lay a large number of observation piles, and the workload is large. The disadvantages of the stress-dispersion method are as follows: the stress diffusion method can accurately measure the locking rail temperature of the section, but the railway fastener needs to be loosened for diffusion operation, so that the stress diffusion method is long in working time, large in workload and not suitable for rapid measurement. Disadvantages of the ultrasonic testing method: the locking rail temperature cannot be directly measured, information such as the initial locking rail temperature, the initial rail stretching state and the rail material needs to be input, and the information is difficult to acquire for the existing railway.
Disclosure of Invention
Aiming at the problems that observation pile in the prior art is large in observation error, large in workload of a diffusion method and incapable of realizing direct measurement by ultrasonic waves, the invention provides a vibration mode-based rail locking rail temperature detection method. The rail temperature measurement can be directly realized by the relationship between the longitudinal force of the steel rail and the temperature without external input conditions.
The invention adopts the following technical scheme:
a rail locking rail temperature detection method based on a vibration mode comprises the following steps:
firstly, arranging a temperature sensor and a vibration sensor on a steel rail;
secondly, performing signal excitation by adopting a force hammer, and judging the validity of data by acquiring a force hammer signal and performing correlation comparison on acquired modal data;
collecting vibration modes and force hammer excitation signals by adopting high-precision analog quantity collecting equipment, and transmitting the collected data to a human-computer processing unit for data processing and calculation;
fourthly, the man-machine processing unit processes data, and converts the time domain signal into a frequency domain signal through fast Fourier transform to obtain frequency data;
screening the obtained frequency data to obtain effective natural frequency;
step six, acquiring a longitudinal force of the steel rail according to a linear relation between the longitudinal force and the natural frequency;
and seventhly, calculating the locking rail temperature according to the relation between the locking rail temperature and the longitudinal force of the steel rail.
Further, in the first step, the temperature sensor is arranged at the rail web of the steel rail; the vibration sensor is arranged on a neutral axis of the rail web of the steel rail in a magnetic attraction mode, and the vibration sensor spans 1/4, 1/2 and 3/4 which are divided into four equal parts in the horizontal direction.
Furthermore, the bottom of the vibration sensor is fixedly connected with the insulating pad and the power-off electromagnetic seat in sequence.
Further, in the fifth step, the obtained frequency data is screened, specifically: selecting and eliminating low-frequency signals below 500Hz from the test data; selecting a multi-order frequency from the collected data; and selecting a plurality of natural frequencies, comparing the natural frequencies with a natural frequency database, and selecting effective natural frequencies to perform weighting and averaging calculation by combining the influences of the fastener spacing, the fastener rigidity, the fastener quantity, the fastener damping and the steel rail length on the natural frequencies.
Further, in the seventh step, the locked rail temperature calculation formula is as follows:
T=T0 + σ/E/α
wherein: t is locking rail temperature T0The temperature of the steel rail, sigma the longitudinal force of the steel rail, E the elastic modulus of the steel rail and alpha the linear expansion coefficient of the steel rail.
The invention has the advantages and effects that:
the rail locking rail temperature detection method based on the vibration mode can realize rapid and direct measurement of rail locking rail temperature, has high detection precision and high detection speed, realizes miniaturization and portable measurement of equipment, solves the problem of rail temperature measurement of a stress concentration point by railway departments, and provides important basis for maintenance of the railway departments.
The method of the invention does not need manual observation, can realize the observation of stress concentration points, does not need to lay a large number of observation piles, does not need to loosen railway fasteners for diffusion operation, reduces the workload, is suitable for rapid measurement, and avoids the defects of an ultrasonic detection method.
Drawings
FIG. 1 is a schematic layout view of a locking rail temperature detection device;
fig. 2 shows a vibration sensor with an insulating pad and a power-off electromagnetic base at the bottom.
The components in the figure: 1 is a vibration sensor, 2 is an insulating pad, and 3 is a magnetic seat.
Detailed Description
The invention is further explained below with reference to the figures and the examples.
The invention relates to a vibration mode-based rail locking temperature detection method, which comprises the following steps of:
the method comprises the following steps that firstly, a temperature sensor is arranged at the rail web of the steel rail and used for testing the temperature of the steel rail. The vibration sensor is arranged on a neutral axis of the rail web of the steel rail in a magnetic attraction mode, and the vibration sensor spans 1/4, 1/2 and 3/4 which are divided into four equal parts in the horizontal direction. And the sensor is quickly mounted and dismounted by adopting the power-off electromagnet. The electromagnet is not powered at ordinary times and has magnetism, and the sensor can be arranged on the steel rail; the electromagnet is electrified, the magnet loses magnetic force, and the sensor is detached. In order to reduce the influence of electric signals such as track circuits, steel rail traction backflow and the like on collected signals, an insulating pad is additionally arranged between the sensor and the magnetic base, the insulating pad is made of materials which are selected to ensure that the sensor can be quickly connected, and meanwhile, the transmission of vibration signals is not influenced. The power-off electromagnet, the insulating pad and the sensor are connected through threads or bonding, and as shown in fig. 2, the bottom of the vibration sensor 1 is fixedly connected with the insulating pad 2 and the power-off electromagnet seat 3 in sequence.
And secondly, knocking a plurality of knocking points of the rail web of the steel rail by using a force hammer on adjacent spans where the sensors are distributed, so that signal source excitation is realized. The knocking points are selected at 0, 1/4, 1/2 and 3/4 of the neutral axis of the rail web, which is one-fourth across in the horizontal direction.
And thirdly, acquiring vibration modes and force hammer excitation signals by adopting high-precision analog quantity acquisition equipment (a data acquisition unit). The vibration sensor mainly collects a transverse vibration acceleration time domain signal of the steel rail. And transmitting the acquired data to a man-machine processing unit for data processing and calculation. And (3) carrying out correlation comparison on the force hammer signal and the acquired vibration mode data, and judging the validity of the data, as shown in figure 1.
And fourthly, the man-machine processing unit processes data and converts the time domain signal into a frequency domain signal through fast Fourier transform. The low-frequency part of the track vibration is easily influenced by a track bed, a roadbed, a bridge and a tunnel, and the frequency above 500Hz is irrelevant to the track bed structure, so that low-frequency signals below 500Hz are selected and removed from the test data. The selection of multiple order frequencies reduces the effect of fastener spacing and fastener stiffness on the measurement of longitudinal forces. For example, multiple frequency points between 1KHz and 5KHz are obtained through multi-channel comparison, and the number of the frequency points can be different according to different test environments.
And fifthly, selecting a plurality of frequency points from the collected data, comparing the frequency points with a natural frequency database, screening frequency points according to the influence of the fastener spacing, the fastener rigidity, the fastener quantity, the fastener damping and the steel rail length on the natural frequency, selecting effective frequency points 1210Hz, 1508Hz and 2007Hz, wherein the natural frequency in the database is 1200 Hz, 1500 Hz and 2000 Hz respectively, calculating the frequency variation of each natural frequency point, and weighting, averaging and calculating the frequency variation.
And step six, calculating the longitudinal force of the steel rail according to a linear relation between the longitudinal force and the natural frequency.
Step seven, calculating the locking rail temperature according to the relation between the locking rail temperature and the longitudinal force of the steel rail:
the locked rail temperature calculation formula is as follows:
T=T0 + σ/E/α
in the formula, T: locking rail temperature, T0: temperature of steel rail, σ: longitudinal force of steel rail, E: elastic modulus of steel rail, α: linear expansion coefficient of the steel rail.
The rail locking temperature can be obtained by the method. The method comprises the steps of measuring the vibration mode of the steel rail and the temperature of the steel rail, selecting a plurality of natural frequencies by utilizing the approximate linear relation between the longitudinal force of the steel rail and the natural frequency of the steel rail, and comprehensively calculating the longitudinal force of the steel rail. The rail temperature measurement can be directly realized by the relationship between the longitudinal force of the steel rail and the temperature without external input conditions. The rail temperature measuring device can realize rapid and direct measurement of rail locking temperature, has high detection precision and high speed, realizes miniaturization and portable measurement of equipment, solves the problem that the rail temperature measurement is locked at a stress concentration point by a railway department, and provides important basis for maintenance and repair of the railway department.
Claims (5)
1. A rail locking rail temperature detection method based on a vibration mode is characterized by comprising the following steps:
firstly, arranging a temperature sensor and a vibration sensor on a steel rail;
secondly, performing signal excitation by adopting a force hammer, and judging the validity of data by acquiring a force hammer signal and performing correlation comparison on acquired modal data;
collecting vibration modes and force hammer excitation signals by adopting high-precision analog quantity collecting equipment, and transmitting the collected data to a human-computer processing unit for data processing and calculation;
fourthly, the man-machine processing unit processes data, and converts the time domain signal into a frequency domain signal through fast Fourier transform to obtain frequency data;
screening the obtained frequency data to obtain effective natural frequency;
step six, acquiring a longitudinal force of the steel rail according to a linear relation between the longitudinal force and the natural frequency;
and seventhly, calculating the locking rail temperature according to the relation between the locking rail temperature and the longitudinal force of the steel rail.
2. A rail locking rail temperature detection method based on a vibration mode according to claim 1, characterized in that: in the first step, the temperature sensor is arranged at the rail web of the steel rail; the vibration sensor is arranged on a neutral axis of the rail web of the steel rail in a magnetic attraction mode, and the vibration sensor spans 1/4, 1/2 and 3/4 which are divided into four equal parts in the horizontal direction.
3. A rail locking rail temperature detection method based on a vibration mode as claimed in claim 2, characterized in that: the bottom of the vibration sensor is fixedly connected with the insulating pad and the power-off electromagnetic seat in sequence.
4. A rail locking rail temperature detection method based on a vibration mode according to claim 1, characterized in that: in the fifth step, the obtained frequency data is screened, specifically: selecting and eliminating low-frequency signals below 500Hz from the test data; selecting a multi-order frequency from the collected data; and selecting a plurality of natural frequencies, comparing the natural frequencies with a natural frequency database, and selecting effective natural frequencies to perform weighting and averaging calculation by combining the influences of the fastener spacing, the fastener rigidity, the fastener quantity, the fastener damping and the steel rail length on the natural frequencies.
5. A rail locking rail temperature detection method based on a vibration mode according to claim 1, characterized in that: in the seventh step, the locked rail temperature calculation formula is as follows:
wherein: t is locking rail temperature T0The temperature of the steel rail, sigma the longitudinal force of the steel rail, E the elastic modulus of the steel rail and alpha the linear expansion coefficient of the steel rail.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137806.1A CN113847958A (en) | 2021-09-27 | 2021-09-27 | Steel rail locking rail temperature detection method based on vibration mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111137806.1A CN113847958A (en) | 2021-09-27 | 2021-09-27 | Steel rail locking rail temperature detection method based on vibration mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113847958A true CN113847958A (en) | 2021-12-28 |
Family
ID=78980224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111137806.1A Pending CN113847958A (en) | 2021-09-27 | 2021-09-27 | Steel rail locking rail temperature detection method based on vibration mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113847958A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116754091A (en) * | 2023-08-15 | 2023-09-15 | 河北铁达科技有限公司 | Method, device and equipment for detecting rail locking temperature of steel rail |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442679A (en) * | 2002-03-05 | 2003-09-17 | 王建文 | Jointless track temperature force and locking rail temperature test method |
| CN101000269A (en) * | 2006-01-09 | 2007-07-18 | 同济大学 | Method for measuring rail longitudinal force of jointless track structure |
| CN105758463A (en) * | 2016-04-15 | 2016-07-13 | 山西科为感控技术有限公司 | Continuous welded rail track temperature stress detecting system |
| CN110864836A (en) * | 2019-11-15 | 2020-03-06 | 华东交通大学 | Longitudinal force detection method based on steel rail |
| CN110926676A (en) * | 2019-12-17 | 2020-03-27 | 沈阳建筑大学 | Method for acquiring temperature force by utilizing vibration characteristic of steel rail |
| CN113051705A (en) * | 2020-12-24 | 2021-06-29 | 华东交通大学 | Method for accurately predicting rail temperature of steel rail |
-
2021
- 2021-09-27 CN CN202111137806.1A patent/CN113847958A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1442679A (en) * | 2002-03-05 | 2003-09-17 | 王建文 | Jointless track temperature force and locking rail temperature test method |
| CN101000269A (en) * | 2006-01-09 | 2007-07-18 | 同济大学 | Method for measuring rail longitudinal force of jointless track structure |
| CN105758463A (en) * | 2016-04-15 | 2016-07-13 | 山西科为感控技术有限公司 | Continuous welded rail track temperature stress detecting system |
| CN110864836A (en) * | 2019-11-15 | 2020-03-06 | 华东交通大学 | Longitudinal force detection method based on steel rail |
| CN110926676A (en) * | 2019-12-17 | 2020-03-27 | 沈阳建筑大学 | Method for acquiring temperature force by utilizing vibration characteristic of steel rail |
| CN113051705A (en) * | 2020-12-24 | 2021-06-29 | 华东交通大学 | Method for accurately predicting rail temperature of steel rail |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116754091A (en) * | 2023-08-15 | 2023-09-15 | 河北铁达科技有限公司 | Method, device and equipment for detecting rail locking temperature of steel rail |
| CN116754091B (en) * | 2023-08-15 | 2023-10-27 | 河北铁达科技有限公司 | Method, device and equipment for detecting rail locking temperature of steel rail |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107560764B (en) | A method of rail longitudinal force is detected based on rail lateral dynamic characteristics | |
| CN105783799B (en) | A kind of fragment-free track slab gap depth lossless detection method and equipment based on vibration | |
| CN107328496B (en) | A method of based on rail vertical motion Characteristics Detection rail longitudinal force | |
| CN101660958B (en) | Longitudinal force measuring method of seamless track steel rail | |
| Shirole et al. | Damage monitoring in rock specimens with pre-existing flaws by non-linear ultrasonic waves and digital image correlation | |
| CN101539493A (en) | Symmetric signal method for structural damage diagnosis | |
| CN108318126B (en) | Method for detecting rigidity of rail lower base plate based on vertical vibration characteristic of steel rail | |
| CN113847958A (en) | Steel rail locking rail temperature detection method based on vibration mode | |
| CN114065540A (en) | Framework modal resonance judging method based on dynamic stress, vibration and OMA (open mobile alliance) comprehensive analysis | |
| JP2015102363A (en) | Vibration analysis device | |
| CN110936977B (en) | Method for detecting loosening of fastener of high-speed ballastless track structure | |
| CN110926676B (en) | Method for acquiring temperature force by utilizing vibration characteristic of steel rail | |
| CN109855771B (en) | Method for detecting temperature based on vertical acceleration power spectrum density of steel rail | |
| CN111353238A (en) | Pier scouring depth identification method based on vehicle sensing | |
| Fayyadh et al. | Condition assessment of elastic bearing supports using vibration data | |
| CN108333061B (en) | System and method for measuring stress relaxation | |
| CN111504589A (en) | Impact attenuation testing method for rail transit fastener | |
| CN109629347A (en) | The method for evaluating ballastless track roadbed grout hazard rating | |
| CN108318125B (en) | Method for detecting ballast rigidity based on vertical vibration characteristic of steel rail | |
| CN113051705B (en) | Method for accurately predicting rail temperature of steel rail | |
| Obadat et al. | Full-scale field evaluation of microelectromechanical system-based biaxial strain transducer and its application in fatigue analysis | |
| CN113447163A (en) | Method for measuring locked rail temperature based on overall change of steel rail mode | |
| Kapustian et al. | Modeling the state of a railway track foundation by seismic methods | |
| Epple et al. | Ultrasonic monitoring of large-scale structures-input to engineering assessment | |
| Guo et al. | Application of clan member signal method in structural damage detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |