CN106740983B - A kind of track fracture monitoring method and device - Google Patents
A kind of track fracture monitoring method and device Download PDFInfo
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- CN106740983B CN106740983B CN201710007811.8A CN201710007811A CN106740983B CN 106740983 B CN106740983 B CN 106740983B CN 201710007811 A CN201710007811 A CN 201710007811A CN 106740983 B CN106740983 B CN 106740983B
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000003776 cleavage reaction Methods 0.000 claims abstract description 29
- 230000007017 scission Effects 0.000 claims abstract description 29
- 238000002604 ultrasonography Methods 0.000 claims description 11
- 238000012806 monitoring device Methods 0.000 claims description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000010010 raising Methods 0.000 description 3
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- 235000008434 ginseng Nutrition 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61K—AUXILIARY EQUIPMENT SPECIALLY ADAPTED FOR RAILWAYS, NOT OTHERWISE PROVIDED FOR
- B61K9/00—Railway vehicle profile gauges; Detecting or indicating overheating of components; Apparatus on locomotives or cars to indicate bad track sections; General design of track recording vehicles
- B61K9/08—Measuring installations for surveying permanent way
- B61K9/10—Measuring installations for surveying permanent way for detecting cracks in rails or welds thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L23/00—Control, warning or like safety means along the route or between vehicles or trains
- B61L23/04—Control, warning or like safety means along the route or between vehicles or trains for monitoring the mechanical state of the route
- B61L23/042—Track changes detection
- B61L23/044—Broken rails
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The application provides a kind of track fracture monitoring method and device.The first ultrasonic sensor and the second ultrasonic sensor is respectively set at the both ends of orbital segment to be monitored in advance, first ultrasonic sensor and the second ultrasonic sensor are respectively used to the ultrasonic signal in monitoring track；Method includes: to obtain the first ultrasonic signal that first ultrasonic sensor monitors and the second ultrasonic signal that second ultrasonic sensor monitors；Judge whether first ultrasonic signal or second ultrasonic signal meet preset condition；If at least one of first ultrasonic signal or second ultrasonic signal meet preset condition, determines and track cleavage event occurs in the orbital segment.The application, which passes through to monitor, determines that at least one of the first ultrasonic signal or second ultrasonic signal meet preset condition, determines that track cleavage event occurs for the orbital segment, track fracture monitoring method realization provided by the present application is simple, at low cost, low in energy consumption.
Description
Technical field
This application involves space flight detection and railway security technical field more particularly to a kind of track based on Acoustic detection are disconnected
Split monitoring method and device.
Background technique
It is higher and higher to the degree of dependence of railway transportation with the development of modern economy, investment of the country to railway transportation
Also persistently increase, construction of the railway network achieves the development of great-leap-forward, while the requirement to train running speed also steps up.
In recent years, China railways experienced six extensive speed-raisings, and raising speed railway has reached 16500 kilometers, continuous in the speed of train
While raising, the amount of starting of train also gradually increases.For China railways traffic driving still based on passenger-cargo co, train density is high
It ranks first in the world.All to the efficient public security system of train operation, more stringent requirements are proposed for these factors, and safety is railway fortune
Defeated eternal theme guarantees that the high speed of train, safety, steady, running without interruption becomes railway efficient transportation in this case
An important mission.
Military service safety of the railway operation safety mainly for railroad rail.By studying the monitoring of the whole network broken rail, realize to iron
The safety detection of rail service state can find broken rail event in time, avoid major accident.Therefore, it realizes disconnected to track
The monitoring split is to ensuring that railway operation has a very important significance safely.
Currently, China mainly uses hand propelled inspection car manually to patrol rail vehicle and large-scale rail-defect detector car regular visit, or adopt
Broken rail detection is carried out to the methods of rail real-time monitoring with track circuit.However these broken rail detection methods realize complicated, power consumption
Greatly, at high cost.Therefore it provides a kind of realize that simple, low cost, the track fracture monitoring method of low-power consumption are that current urgent need solves
A technical problem.
Summary of the invention
In view of this, the application provides a kind of track fracture monitoring method and device, simple, at low cost, power consumption is realized
Low, technical solution is as follows:
One side based on the application, the application provides a kind of track fracture monitoring method, in advance in track to be monitored
The first ultrasonic sensor and the second ultrasonic sensor is respectively set in the both ends of section, and first ultrasonic sensor and the second ultrasound pass
Sensor is respectively used to the ultrasonic signal in monitoring track；The described method includes:
Obtain the first ultrasonic signal and second ultrasonic sensor prison that first ultrasonic sensor monitors
The second ultrasonic signal measured；
Judge whether first ultrasonic signal or second ultrasonic signal meet preset condition；
If at least one of first ultrasonic signal or second ultrasonic signal meet preset condition, institute is determined
It states and track cleavage event occurs in orbital segment.
Preferably, described to judge whether first ultrasonic signal or second ultrasonic signal meet preset condition packet
It includes:
Judge first ultrasonic signal or second ultrasonic signal whether include track fracture and crack propagation sound
Learn characteristic information.
Preferably, after track cleavage event occurs for the determination orbital segment to be monitored, the method also includes:
Determine that first ultrasonic signal meets the first moment of preset condition and second ultrasonic signal meets in advance
If the second moment of condition；
Calculate the time difference at first moment Yu second moment；
According to the time difference, ultrasonic signal spread speed and first ultrasonic sensor and the second ultrasonic sensing
The distance between device value calculates the position that track cleavage event occurs on the orbital segment.
Preferably, after obtaining first ultrasonic signal and/or the second ultrasonic signal, the method also includes:
The first ultrasonic signal and/or the second ultrasonic signal that get are pre-processed.
Preferably, first ultrasonic sensor and the second ultrasonic sensor are piezoelectric type acoustic sensor.
Another aspect based on the application, the application provide a kind of track break monitoring device, comprising:
At least two ultrasonic sensors, at least two ultrasonic sensor include the first ultrasonic sensor and the second ultrasound
Sensor, first ultrasonic sensor and the second ultrasonic sensor are separately positioned on the both ends of orbital segment to be monitored, are used for
Monitor the ultrasonic signal in track；
Acquiring unit, for obtaining the first ultrasonic signal and described that first ultrasonic sensor monitors
The second ultrasonic signal that two ultrasonic sensors monitor；
Judging unit, for judging whether first ultrasonic signal or second ultrasonic signal meet preset condition；
First determination unit, for judging first ultrasonic signal or second ultrasonic signal when the judging unit
At least one of when meeting preset condition, determine that track cleavage event occurs for the orbital segment.
Preferably, the judging unit is specifically used for, and judges first ultrasonic signal or second ultrasonic signal is
The no acoustic feature information including track fracture and crack propagation.
Preferably, further includes:
Second determination unit, for determining that first ultrasonic signal meets the first moment of preset condition and described
Second ultrasonic signal meets the second moment of preset condition；
First computing unit, for calculating the time difference at first moment Yu second moment；
Second computing unit, for according to the time difference, ultrasonic signal spread speed and first ultrasonic sensing
The distance between device and the second ultrasonic sensor value calculate the position that track cleavage event occurs on the orbital segment.
Preferably, further includes:
Pretreatment unit, for being pre-processed to the first ultrasonic signal and/or the second ultrasonic signal that get.
Preferably, the ultrasonic sensor is piezoelectric type acoustic sensor.
In track fracture monitoring method provided by the present application, first is respectively set at the both ends of orbital segment to be monitored in advance
Ultrasonic sensor and the second ultrasonic sensor, first ultrasonic sensor and the second ultrasonic sensor are respectively used to real-time monitoring
Ultrasonic signal in track.When track cleavage event occurs in orbital segment, what the first ultrasonic sensor monitored the first surpasses
The second ultrasonic signal that acoustical signal and the second ultrasonic sensor monitor can meet preset condition, and therefore, the application passes through
It monitors and determines that at least one of the first ultrasonic signal or second ultrasonic signal meet preset condition, determine the orbital segment
Track cleavage event occurs, track fracture monitoring method realization provided by the present application is simple, at low cost, low in energy consumption.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the flow chart that a kind of track provided by the present application is broken monitoring method；
Fig. 2 is the scheme of installation of ultrasonic sensor in the application；
Fig. 3 is another flow chart that a kind of track provided by the present application is broken monitoring method；
Fig. 4 is a kind of structural schematic diagram of track break monitoring device provided by the present application；
Fig. 5 is a kind of another structural schematic diagram of track break monitoring device provided by the present application.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, it illustrates a kind of flow charts of track fracture monitoring method provided by the present application.In concrete application
Before the application method, the first ultrasonic sensor and the second ultrasound is respectively set at the both ends of orbital segment to be monitored in advance first
Sensor, as shown in Fig. 2, first ultrasonic sensor and the second ultrasonic sensor are respectively used to the ultrasound letter in monitoring track
Number.For track longer for length, the application can be spaced fixed range in orbit and a ultrasonic sensor is arranged, and lead to
Spaced multiple ultrasonic sensors in orbit are crossed, are multiple orbital segments by division of period orbit, the monitoring object of the application is
For the orbital segment between every two ultrasonic sensor.Specifically, method includes:
Step 101, the first ultrasonic signal and second ultrasound that first ultrasonic sensor monitors are obtained
The second ultrasonic signal that sensor monitors.
During traveling, wheel can rub with interorbital and generate ultrasonic wave train, and the setting of the first ultrasonic sensor is in-orbit
The other end of orbital segment, the first ultrasonic sensor and the second ultrasonic sensor is arranged in one end of road section, the second ultrasonic sensor
Ultrasonic signal in the real-time monitoring orbital segment simultaneously.Clear for ease of description, the application monitors the first ultrasonic sensor
Obtained ultrasonic signal is referred to as the first ultrasonic signal, and the ultrasonic signal that the second ultrasonic sensor monitors is referred to as second
Ultrasonic signal.
In the application actual application, the first ultrasonic sensor and the second ultrasonic sensor can be specially piezoelectric type
The piezoelectric type acoustics sensor implement body is adsorbed on the rail bottom or the web of the rail of track, the piezoelectric type acoustics sensor by acoustic sensor
Device can receive the ultrasonic signal of 40kHz to 300kHz frequency range.
In the application, when track cleavage event does not occur for orbital segment, what the first ultrasonic sensor monitored the first surpasses
The characteristic parameters such as frequency, the amplitude of the second ultrasonic signal that acoustical signal and the second ultrasonic sensor monitor all can be at some
It is smoothly presented in fixed range.
Step 102, judge whether first ultrasonic signal or second ultrasonic signal meet preset condition.If full
Foot executes step 103, if conditions are not met, returning to step 101.
Specifically, the application can use time frequency analysis side after getting the first ultrasonic signal and the second ultrasonic signal
Method analyzes it, and the step 102 can be specifically, judge first ultrasonic signal or the second ultrasound letter at this time
Number whether include track fracture and crack propagation acoustic feature information.Wherein, acoustic feature information includes frequency of sound wave, sound wave
Amplitude etc..When track cleavage event occurs in orbital segment, the fracture of track or crackle can make the first ultrasonic signal and the
The frequency of two ultrasonic signals changes, and the event acoustic feature dominant frequency of middle orbit fracture and crack propagation is in 120kHz-
Between 170kHz, therefore in orbital segment when generation track cleavage event, the frequency of the first ultrasonic signal and the second ultrasonic signal
It can fall in frequency range 120kHz-170kHz, thus the application can be by judging the first ultrasonic signal and the second ultrasound
Whether the frequency of signal, which falls in the frequency range, judges to learn track cleavage event whether occurs in current orbit section.This
Outside, the time-domain signal of the first ultrasonic signal and the second ultrasonic signal can also occur significantly to be mutated, and its amplitude significantly increases, this
Application judges track cleavage event whether occurs in current orbit section by judging that its range value size can also be realized.
The application is executed when judging that at least one of the first ultrasonic signal or the second ultrasonic signal meet preset condition
Step 103, it determines and track cleavage event occurs in the orbital segment.If the first ultrasonic signal and the second ultrasonic signal are discontented
Sufficient preset condition then shows that track cleavage event does not occur in current orbit section, continues to obtain the first ultrasonic signal and the in real time
Two ultrasonic signals.
Step 103, it determines and track cleavage event occurs in the orbital segment.
It is preferred as the application, it can also include step 100 after step 101, the first ultrasound got is believed
Number and/or the second ultrasonic signal pre-processed.Wherein pretreatment includes signal amplification, filtering, A/D conversion etc..
In the application actual application, what the first ultrasonic sensor and the second ultrasonic sensor monitored the first surpasses
Acoustical signal and the second ultrasonic signal can have the problems such as power is smaller, there are interfering frequencies, therefore the application is getting first
After ultrasonic signal and the second ultrasonic signal, it is successively amplified, its frequency is filtered out for 100kHz ultrasonic signal below,
A/D conversion etc., to guarantee the accuracy of ultrasonic signal.
Therefore it in track fracture monitoring method provided by the present application, is respectively set in advance at the both ends of orbital segment to be monitored
First ultrasonic sensor and the second ultrasonic sensor, first ultrasonic sensor and the second ultrasonic sensor are respectively used in real time
Monitor the ultrasonic signal in track.When track cleavage event occurs in orbital segment, the first ultrasonic sensor monitor the
The second ultrasonic signal that one ultrasonic signal and the second ultrasonic sensor monitor can meet preset condition, therefore, the application
It determines that at least one of the first ultrasonic signal or second ultrasonic signal meet preset condition by monitoring, determines the rail
Track cleavage event occurs in road section, track fracture monitoring method realization provided by the present application is simple, at low cost, low in energy consumption.
Further, the application can also further determine that errant after determining that track cleavage event occurs in orbital segment
The position that track fracture or crackle specifically occur in section, as shown in figure 3, on the basis of Fig. 1, further includes:
Step 104, determine that first ultrasonic signal meets the first moment of preset condition and second ultrasound is believed
Number meet the second moment of preset condition.
The application determines and records that generation meets default item after determining that track cleavage event occurs in current orbit section
First moment of the first ultrasonic signal of part, and generate the second moment for meeting the second ultrasonic signal of preset condition.
Specifically, the application can extract the time for generating the obvious rising edge for the first ultrasonic signal for meeting preset condition
Information extracts the temporal information conduct for generating the obvious rising edge for the second ultrasonic signal for meeting preset condition as the first moment
Second moment.
Step 105, the time difference at first moment and second moment is calculated.
Step 106, according to the time difference, ultrasonic signal spread speed and first ultrasonic sensor and second
The distance between ultrasonic sensor value calculates the position that track cleavage event occurs on the orbital segment.
Track fracture monitoring method provided by the present application has the advantages that
1, the application be suitable for switch area tongue, heart rail, wing rail, stock rail fracture and the real-time monitoring of serious hurt；
2, the application is not take up rail, does not influence track normal operation；
3, the application may be implemented remotely to monitor, and it is accurate to position fracture, being capable of directly and accurately guide maintenance personnel
Site examining and repairing is reached, inspection is carried out without the whole region in longer lines, saves the rail repair time；
4, the application can realize that track crack propagation and the detection of track fracture can be detected before thorough broken rail occurs
The health status of its rail service phase out judges whether there is the generation such as slight crack, crack propagation, early discovery damage, realizes early
Phase early warning；
5, the application may extend to the Integrity Verification of rail fastening etc..
It is broken monitoring method based on a kind of track provided by the present application above, the application also provides a kind of track fracture monitoring
Device, as shown in Figure 4, comprising:
At least two ultrasonic sensors 100, at least two ultrasonic sensor 100 include the first ultrasonic sensor 101
With the second ultrasonic sensor 102, first ultrasonic sensor 101 and the second ultrasonic sensor 102 are separately positioned on to be monitored
Orbital segment both ends, for monitoring the ultrasonic signal in track；The ultrasonic sensor 100 is specially piezoelectric type acoustics sensor
Device；
Acquiring unit 200 monitors the first obtained ultrasonic signal for obtaining first ultrasonic sensor 101, and
Second ultrasonic sensor 102 monitors the second obtained ultrasonic signal；
Judging unit 300, for judging whether first ultrasonic signal or second ultrasonic signal meet default item
Part；
First determination unit 400, for when the judging unit 300 judges first ultrasonic signal or described the second surpasses
When at least one of acoustical signal meets preset condition, determine that track cleavage event occurs for the orbital segment.
Wherein, the judging unit 300 is specifically used for, and judges first ultrasonic signal or second ultrasonic signal is
The no acoustic feature information including track fracture and crack propagation.
Preferably, the application can also include, as shown in Figure 5:
Second determination unit 500, for determining that first ultrasonic signal meets the first moment of preset condition, Yi Jisuo
State the second moment that the second ultrasonic signal meets preset condition；
First computing unit 600, for calculating the time difference at first moment Yu second moment；
Second computing unit 700, for according to the time difference, ultrasonic signal spread speed and first ultrasound
The distance between sensor 101 and the second ultrasonic sensor 102 value calculate the position that track cleavage event occurs on the orbital segment
It sets；
And pretreatment unit 800, it is pre- for being carried out to the first ultrasonic signal got and/or the second ultrasonic signal
Processing.
It should be noted that all the embodiments in this specification are described in a progressive manner, each embodiment weight
Point explanation is the difference from other embodiments, and the same or similar parts between the embodiments can be referred to each other.
For device class embodiment, since it is basically similar to the method embodiment, so being described relatively simple, related place ginseng
See the part explanation of embodiment of the method.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
A kind of track fracture monitoring method provided herein and device are described in detail above, answered herein
With specific case, the principle and implementation of this application are described, and the explanation of above example is only intended to help to manage
Solve the present processes and its core concept；At the same time, for those skilled in the art, according to the thought of the application,
There will be changes in specific embodiment and application range, in conclusion the content of the present specification should not be construed as to this Shen
Limitation please.
Claims (6)
1. a kind of track is broken monitoring method, which is characterized in that be respectively set first at the both ends of orbital segment to be monitored in advance
Ultrasonic sensor and the second ultrasonic sensor, first ultrasonic sensor and the second ultrasonic sensor are respectively used to monitoring track
In ultrasonic signal；The described method includes:
It obtains the first ultrasonic signal that first ultrasonic sensor monitors and second ultrasonic sensor monitors
The second ultrasonic signal arrived；
Judge whether first ultrasonic signal or second ultrasonic signal meet preset condition；
If at least one of first ultrasonic signal or second ultrasonic signal meet preset condition, the rail is determined
Track cleavage event occurs in road section；
After wherein track cleavage event occurs for the determination orbital segment to be monitored, the method also includes:
Determine that first ultrasonic signal meets the first moment of preset condition and second ultrasonic signal meets default item
Second moment of part；
Calculate the time difference at first moment Yu second moment；
According to the time difference, ultrasonic signal spread speed and first ultrasonic sensor and the second ultrasonic sensor it
Between distance value, calculate on the orbital segment occur track cleavage event position；
Wherein, described to judge whether first ultrasonic signal or second ultrasonic signal meet preset condition and include:
Judge whether first ultrasonic signal or second ultrasonic signal include that track fracture and the acoustics of crack propagation are special
Reference breath.
2. the method according to claim 1, wherein obtaining first ultrasonic signal and/or the second ultrasound letter
After number, the method also includes:
The first ultrasonic signal and/or the second ultrasonic signal that get are pre-processed.
3. the method according to claim 1, wherein first ultrasonic sensor and the second ultrasonic sensor are equal
For piezoelectric type acoustic sensor.
4. a kind of track break monitoring device characterized by comprising
At least two ultrasonic sensors, at least two ultrasonic sensor include the first ultrasonic sensor and the second ultrasonic sensing
Device, first ultrasonic sensor and the second ultrasonic sensor are separately positioned on the both ends of orbital segment to be monitored, for monitoring
Ultrasonic signal in track；
Acquiring unit, for obtaining the first ultrasonic signal that first ultrasonic sensor monitors and described the second surpassing
The second ultrasonic signal that sonic transducer monitors；
Judging unit, for judging whether first ultrasonic signal or second ultrasonic signal meet preset condition；
First determination unit, for judging in first ultrasonic signal or second ultrasonic signal when the judging unit
When at least one meets preset condition, determine that track cleavage event occurs for the orbital segment；
Second determination unit, for determining that first ultrasonic signal meets the first moment and described second of preset condition
Ultrasonic signal meets the second moment of preset condition；
First computing unit, for calculating the time difference at first moment Yu second moment；
Second computing unit, for according to the time difference, ultrasonic signal spread speed and first ultrasonic sensor and
The distance between second ultrasonic sensor value calculates the position that track cleavage event occurs on the orbital segment；
Wherein, the judging unit is specifically used for, judge first ultrasonic signal or second ultrasonic signal whether include
The acoustic feature information of track fracture and crack propagation.
5. device according to claim 4, which is characterized in that further include:
Pretreatment unit, for being pre-processed to the first ultrasonic signal and/or the second ultrasonic signal that get.
6. device according to claim 4, which is characterized in that the ultrasonic sensor is piezoelectric type acoustic sensor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710007811.8A CN106740983B (en) | 2017-01-05 | 2017-01-05 | A kind of track fracture monitoring method and device |
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| CN201710007811.8A CN106740983B (en) | 2017-01-05 | 2017-01-05 | A kind of track fracture monitoring method and device |
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| CN106740983B true CN106740983B (en) | 2019-02-19 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107607618A (en) * | 2017-09-07 | 2018-01-19 | 新疆金风科技股份有限公司 | The crack warning method and crack warning system of the hardware of wind power generating set |
| KR102369916B1 (en) * | 2020-05-12 | 2022-03-04 | 한국철도기술연구원 | Rail fracture decision system and method for deciding rail fracture using the same |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960005A (en) * | 1974-08-09 | 1976-06-01 | Canac Consultants Limited | Ultrasonic testing device for inspecting thermit rail welds |
| CN101424664A (en) * | 2008-12-05 | 2009-05-06 | 中国铁道科学研究院金属及化学研究所 | Rail tread crack ultrasonic detection device and detecting method |
| CN102416970A (en) * | 2011-10-12 | 2012-04-18 | 北京安通伟业铁路工务技术有限公司 | On-line steel rail fracture monitoring system and knock detection method |
| CN103472134A (en) * | 2013-08-05 | 2013-12-25 | 河北省自动化研究所 | Method for detecting steel rail fracture point by using sound |
-
2017
- 2017-01-05 CN CN201710007811.8A patent/CN106740983B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3960005A (en) * | 1974-08-09 | 1976-06-01 | Canac Consultants Limited | Ultrasonic testing device for inspecting thermit rail welds |
| CN101424664A (en) * | 2008-12-05 | 2009-05-06 | 中国铁道科学研究院金属及化学研究所 | Rail tread crack ultrasonic detection device and detecting method |
| CN102416970A (en) * | 2011-10-12 | 2012-04-18 | 北京安通伟业铁路工务技术有限公司 | On-line steel rail fracture monitoring system and knock detection method |
| CN103472134A (en) * | 2013-08-05 | 2013-12-25 | 河北省自动化研究所 | Method for detecting steel rail fracture point by using sound |
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