CN107436326A - Fault of construction Rapid non-destructive testing device and method under high-speed iron rail - Google Patents
Fault of construction Rapid non-destructive testing device and method under high-speed iron rail Download PDFInfo
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- CN107436326A CN107436326A CN201710758727.XA CN201710758727A CN107436326A CN 107436326 A CN107436326 A CN 107436326A CN 201710758727 A CN201710758727 A CN 201710758727A CN 107436326 A CN107436326 A CN 107436326A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
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- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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Abstract
The present invention relates to fault of construction Rapid non-destructive testing device under a kind of high-speed iron rail, its signal transmitter unit, signal receiving unit, super mangneto transducer and hub-type vibrating sensor is arranged on railway monitoring car；The oscillation control signal output end of processor connects the signal input part of super mangneto transducer by signal transmitter unit, the signal input part of the signal output part connection signal receiving unit of hub-type vibrating sensor, the signal input part of the signal output part connection A/D conversion system of signal receiving unit, the vibration reflected signal input of the signal output part connection processor of A/D conversion system, hub-type vibrating sensor roll on tested fragment-free track slab when track monitoring car detects to railroad track and detect the vibration signal of tested fragment-free track slab reflection.For the present invention without using any couplant, simple in construction, environment-adapting ability is strong, can realize to fault of construction fast checking under ballastless track of high-speed railway rail.
Description
Technical field
The present invention relates to structure service state under high-speed iron rail and defect technical field of nondestructive testing, and in particular to a kind of
Fault of construction Rapid non-destructive testing device and method under high-speed iron rail.
Background technology
China's high ferro formally puts into operation, and the time is still short, and non-fragment orbit Defect inspection technique study relatively lags behind, high ferro roadbed by
Complicated in its, corresponding disease and defective form are various, and wherein ballastless track supporting layer bottom is come to nothing serious threat high ferro
It is safe for operation.Only Beijing Jiaotong University and each Railway Design institute carried out the work of ballastless track roadbed Defect inspection at present.
Ballastless track structure Non-Destructive Testing is at present mainly using two methods of GPR and impact elasticity ripple detection, because of nothing
The usual monolithic concrete closing of tiny fragments of stone, coal, etc. track bed, the space very little between supporting course bottom and bedding, some possibility only have millimeter,
Ground penetrating radar detection resolution ratio is low, does not reach and investigates thoroughly that ballastless track supporting course bottom grade comes to nothing the requirement of state；It is in addition, mixed
Coagulate in native supporting course bottom and contain reinforcing bar, radar electromagnetic wave signal is caused to shield, influence supporting course bottom and come to nothing the spy of state
Survey precision.Effective detection ballastless track supporting layer bottom that group company of impact elasticity Bo Fashi The Fourth Survey and Design Institute of China Railway proposes
Method (the patent No. that portion comes to nothing：0019699.0), whether this method by or not reinforcing bar screening effect, not passing through elastic wave by ZL2015 1
Wave character, spectrum signature, which are sentenced, knows whether ballastless track supporting layer comes to nothing, and this method is tapped using artificial hand hammer and excited at present, point
Survey mode gathered data, percussion excitation energy is unstable, measuring point measurement accuracy is poor, operating efficiency is low, it is impossible to meets that high ferro is quick
The requirement of detection, it is therefore necessary to be improved to impact elastic wave test device, study quick detection means.
The content of the invention
, should it is an object of the invention to provide fault of construction Rapid non-destructive testing device and method under a kind of high-speed iron rail
For detection means without using any couplant, simple in construction, environment-adapting ability is strong, can realize to ballastless track of high-speed railway rail
Lower fault of construction fast checking.
In order to solve the above technical problems, fault of construction Fast nondestructive evaluation fills under a kind of high-speed iron rail disclosed by the invention
Put, it is characterised in that it includes railway monitoring car, signal transmitter unit, signal receiving unit, super mangneto transducer, hub-type
Vibrating sensor, A/D conversion system and processor, the signal transmitter unit, signal receiving unit, super mangneto transducer and
Hub-type vibrating sensor is arranged on railway monitoring car, and the super mangneto transducer is used for vertically downward tested without tiny fragments of stone, coal, etc. rail
500HZ~10kHZ high frequency elastic wave signal is excited on guidance tape；The oscillation control signal output end of the processor passes through signal
Transmitter unit connects the signal input part of super mangneto transducer, the signal output part connection signal of the hub-type vibrating sensor
The signal input part of receiving unit, the signal input part of the signal output part connection A/D conversion system of signal receiving unit, mould
The vibration reflected signal input of the signal output part connection processor of analog-to-digital converting system, the hub-type vibrating sensor are in-orbit
Rolled when road monitoring car detects to railroad track on tested fragment-free track slab and detect the reflection of high frequency elastic wave signal
Vibration signal.
Fault of construction fast non-destructive detection method under a kind of high-speed iron rail using said apparatus, it is characterised in that it
Comprise the following steps：
Step 1：The railway monitoring car is arranged on tested fragment-free track slab；
Step 2：Processor sends oscillation control signal, and oscillation control signal is conveyed to super mangneto by signal transmitter unit
Transducer, super mangneto transducer excite 500HZ on tested fragment-free track slab vertically downward according to the oscillation control signal of reception
~10kHZ high frequency elastic wave signal；
Step 3：Multilayer below tested fragment-free track slab is being run into by the high frequency elastic wave signal that super mangneto transducer excites
Concrete component gap, leakiness defect and CA screeds come to nothing these porous mediums of face when can produce upward back wave,
Hub-type vibrating sensor gathers reflection wave signal, and the reflection wave signal collected is conveyed into place by signal receiving unit
Manage device；
Step 4：Processor carries out Hilbert-Huang transform (Hilbert-Huang), Ran Houtong to reflection wave signal first
Cross and digital filtering, remarkable spectrum analysis, the in-orbit lower multilayer mixed mud structure of elastic wave are carried out to Hilbert-Huang transform result successively
Spread speed analyzing and processing in part, obtains elastic wave radar profile and remarkable spectrogram, by elastic wave radar cross-section
Figure and the progress manual analysis of remarkable spectrogram are that whether there is fragment-free track slab gap below recognizable tested fragment-free track slab, mix
Coagulate native leakiness or supporting course bottom cavity defect.
Beneficial effects of the present invention：
(1) compared with conventional impact wave velocity method, the present invention proposes to replace traditional-handwork hand hammer using super mangneto transducer
As excitaton source, super mangneto transducer is to use super large magnetostriction materials rod as basic structure, suitable for mass concrete
Etc. structure nondestructive testing signal emission source.It is characterized in big transmission power, bandwidth, reproducible, remained shock is small, delay is short and consolidates
Calmly, the characteristics of high conversion efficiency, small volume, suitable for the requirement of ballastless track supporting layer bottom vacant analysis.
(2) compared with conventional impact wave velocity method, the present invention proposes that hub-type sensor replaces single sensor to receive and shaken
Multiple vibrating sensors, i.e., be angularly built in wheel hub by dynamic signal, realizes that continuous rolling measures, greatly accelerates test
Speed.
(3) compared with conventional impact wave velocity method, the present invention proposes fast non-destructive detection method and device in real time at analysis
Reason collection signal, fast imaging can be carried out to result, intuitively reflect defect.
(4) compared with the artificial single-site data acquisition of conventional impact wave velocity method, the present invention proposes fast non-destructive detection method
And device realizes automatic continuous roller measurement, detection efficiency is high, particularly suitable for runing high-speed railway Window time operation.
Brief description of the drawings
Fig. 1 is the structural representation in the present invention.
Fig. 2 is high ferro non-fragment orbit Non-Destructive Testing arrangement of measuring-line schematic diagram in the present invention；
Fig. 3 is impact elasticity ripple radar profile in the present invention；
Fig. 4 is intermediate frequency spectrum analysis chart of the present invention；
Fig. 5 is defect planar imaging figure in the present invention.
Wherein, 1-railway monitoring car, 2-super mangneto transducer, 3-hub-type vibrating sensor, the transmitting of 4-signal are single
Member, 5-signal receiving unit, 6-A/D conversion system, 7-processor, 8-memory cell, 9-display unit, 10-it is tested
Fragment-free track slab, 11-survey line, 12-CA screeds, 13-supporting course, 14-auxiliary operation wheel
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail：
Fault of construction Rapid non-destructive testing device under a kind of high-speed iron rail of the present invention, the device pass through super mangneto transducing
Device excites high frequency elastic wave signal as exciting source on fragment-free track slab, elastic wave signal run into supporting course bottom cavitation,
Come to nothing the porous mediums such as face when can produce reflection, by hub-type sensor receive non-fragment orbit below reflected signal, by right
Receive reflected signal and carry out corresponding frequency spectrum and image procossing, you can identification non-fragment orbit substructure defect or disease position
Put, reach the purpose of fault of construction Fast nondestructive evaluation under high-speed iron rail.The device such as Fig. 1, it is shown including railway monitoring car 1
(equipped with four auxiliary operation wheels 14), signal transmitter unit 4, signal receiving unit 5, super mangneto transducer 2, hub-type vibration pass
Sensor 3, A/D conversion system 6 and processor 7, the signal transmitter unit 4, signal receiving unit 5, the super and of mangneto transducer 2
Hub-type vibrating sensor 3 is arranged on railway monitoring car 1, and the super mangneto transducer 2 is used for vertically downward in tested nothing
500HZ~10kHZ high frequency elastic wave signal is excited on tiny fragments of stone, coal, etc. track plates 10, and (defects of concrete structure is smaller typically in several millis under rail
Meter Hou Du, elastic wave frequency rate, which reaches 500HZ~10kHZ scopes, could effectively differentiate defect, and the reason for selecting elastic wave is electromagnetism
Ripple lacks applicability due to being disturbed by track plate reinforcing mattress, needs couplant during ultrasound examination, and detection efficiency is slow)；It is described
The oscillation control signal output end of processor 7 connects the signal input part of super mangneto transducer 2, institute by signal transmitter unit 4
The signal input part of the signal output part connection signal receiving unit 5 of hub-type vibrating sensor 3 is stated, signal receiving unit 5
Signal output part connects the signal input part of A/D conversion system 6, the signal output part connection processor 7 of A/D conversion system 6
Vibration reflected signal input, the hub-type vibrating sensor 3 when track monitoring car 1 detects to railroad track
Roll and detect on tested fragment-free track slab 10 vibration signal that is reflected on tested fragment-free track slab 10 (high frequency elastic wave signal
Reflecting vibrations signal).
In above-mentioned technical proposal, vibration signal transmitting terminal and the hub-type vibrating sensor 3 of the super mangneto transducer 2
Centre wheel in same straight line, the hub-type vibrating sensor 3 can on tested fragment-free track slab 10 downline road
Direction rolls.
In above-mentioned technical proposal, the hub-type vibrating sensor 3 is made up of four vibrating sensors and centre wheel, four
Vibrating sensor is circumferentially uniformly embedded on the wheel face of centre wheel (detection track plate lower section 1m inner concretes dress by 90 degree of intervals
Put the best results of 4 vibrating sensors), the signal output part of four vibrating sensors is all connected with the letter of signal receiving unit 5
Number input.
In above-mentioned technical proposal, it also includes memory cell 8 and display unit 9, and the data storage end of the processor 7 connects
Connect the data storage end of memory cell 8, the signal input part of the display signal output part connection display unit 9 of the processor 7.
In above-mentioned technical proposal, the vibration signal transmitting terminal of the super mangneto transducer 2 and hub-type vibrating sensor 3 it
Between spacing range be 0.05~0.2m.By adjusting the spacing for exciting and receiving, the multiple anti-of elastic wave can be effectively suppressed
Projection is rung.
In above-mentioned technical proposal, processor 7 has the function of control signal transmitter unit 4 and signal receiving unit 5, has
Real-time impact elastic wave waveform is shown and the function of spectrum analysis.
Conventional impact elasticity wave detecting method exists in high ferro non-fragment orbit rectangular structure defect Non-Destructive Testing is runed
Two deficiencies：1st, artificial hand hammer excitation energy is unstable, remained shock is big, is easily disturbed；2nd, runing high ferro detection is repaired in high ferro
Window time is implemented, and for maintenance Window time typically within 3 hours, conventional impact elasticity ripple detector is spot measurement side
Formula, time-consuming for gathered data, geophone coupling is difficult, operating efficiency is low.
For first point of deficiency, the present invention is proposed using super mangneto transducer 2 replacement traditional-handwork hand hammer as excitaton source,
Super mangneto transducer 2 is to use super large magnetostriction materials rod as basic structure, lossless suitable for structures such as mass concretes
Detection signal emission source.It is characterized in big transmission power, bandwidth, reproducible, remained shock is small, delay is short and fixes, changes effect
The characteristics of rate is high, small volume, suitable for the requirement of ballastless track supporting layer bottom vacant analysis.
For second point deficiency, the present invention proposes that hub-type vibrating sensor 3 receives vibration signal, i.e., passes multiple vibrations
Sensor is angularly built in wheel hub, is realized that continuous rolling measures, is greatly accelerated test speed.
Fault of construction fast non-destructive detection method under a kind of high-speed iron rail using said apparatus, it is characterised in that it
Comprise the following steps：
Step 1：The railway monitoring car 1 is arranged on tested fragment-free track slab 10；
Step 2：Processor 7 sends oscillation control signal, and oscillation control signal is conveyed to super magnetic by signal transmitter unit 4
Transducer 2 is caused, super mangneto transducer 2 excites on tested fragment-free track slab 10 vertically downward according to the oscillation control signal of reception
500HZ~10kHZ high frequency elastic wave signal；
Step 3：By the high frequency elastic wave signal that super mangneto transducer 2 excites run into it is more below tested fragment-free track slab 10
Layer concrete component gap, leakiness defect and CA screeds come to nothing these porous mediums of face when can produce upward reflection
Ripple, hub-type vibrating sensor 3 gather reflection wave signal, and the reflection wave signal collected is defeated by signal receiving unit 5
Give processor 7；
Step 4：Processor 7 reflection wave signal is carried out first Hilbert-Huang transform (be used for low frequency signals suppression and high frequency with
Machine noise), then by in-orbit to Hilbert-Huang transform result progress digital filtering, remarkable spectrum analysis, elastic wave successively
Spread speed analyzing and processing in lower multilayer mixed mud component, obtains elastic wave radar profile and remarkable spectrogram, by right
Elastic wave radar profile and remarkable spectrogram carry out the CA mortars that manual analysis is the recognizable tested lower section of fragment-free track slab 10
Layer 12 and supporting course 13 whether there is fragment-free track slab gap, concrete leakiness or supporting course bottom cavity defect, and defect
Depth location.
In above-mentioned technical proposal, during by carrying out manual analysis to elastic wave radar profile and remarkable spectrogram, for
The good section of the tested rectangular structure of fragment-free track slab 10, elastic wave radar profile waveform is completely regular, in normal attenuation
Form, remarkable spectrogram show as dominant frequency stabilization, integral into unimodal form, nothing be present for surveying the rectangular structure of fragment-free track slab 10
The situation of tiny fragments of stone, coal, etc. track plates gap, concrete leakiness or supporting course bottom cavity defect, elastic wave radar profile show as ripple
Shape is disorderly, discontinuous seismic event feature, and remarkable spectrogram shows as dominant frequency and declines, multimodal morphological feature is presented.
In the step 1 of above-mentioned technical proposal, the railway monitoring car 1 is arranged on hub-type when on tested fragment-free track slab 10
A vibrating sensor in vibrating sensor 3 is posted on tested fragment-free track slab 10；
Also include step 5 after the step 4：Railway monitoring car 1 moves forward the center of hub-type vibrating sensor 3 along track
The 1/4 of girth is taken turns, then the inspection operation of repeat step 2~4.
In above-mentioned technical proposal, 5~8 surveys line 11 are marked in the tested upper edge line direction side by side parallel of fragment-free track slab 10
(survey line 11 is closeer, and lateral resolution is higher, but is limited by the influence of track, can only typically arrange 5~8.Specific single survey line
11 are evenly distributed on track plates equivalent to profile scanning of 2 dimensions along rail direction, multiple surveys line, are advantageous to the 3-dimensional overall evaluation
Multi-layer concrete structural intergrity below track plates), as shown in Fig. 2 pressing the method for step 1~step 5 to each survey line
Carry out detection operation.
In above-mentioned technical proposal, processor 7 is played back, data inspection, to data matter to the reflection wave signal gathered
Amount is poor, and the disorderly data segment of vibration signal detects again.Data inspection finishes, processor 7 can be to gathered data real time data at
Reason, has following functions：Noise compacting, spectrum analysis, correlation analysis, filtering process, elastic wave radar profile, quick plane
Imaging, 3D figure shows.Inspection result figure has following form：Elastic wave radar profile, as shown in Figure 3, spectrum analysis figure,
As shown in Figure 4, fault of construction quick plane is imaged, as shown in Figure 5.Pass through analysing elastic ripple radar profile, frequency spectrum point
Analysis figure, the recognizable non-fragment orbit substructure defect of fault of construction quick plane imaging or disease position.For under non-fragment orbit
The section of portion well-formed, the waveform of detection is completely regular, and in normal attenuation form, dominant frequency is stablized, integral into list on frequency spectrum
Peak shape state, the defects of hole, crack be present for non-fragment orbit substructure, the waveform of detection is disorderly, on frequency spectrum dominant frequency decline,
Multimodal form is presented.
In the step 3 of above-mentioned technical proposal, hub-type vibrating sensor 3 gather the acquisition time of reflection wave signal for 1~
2ms。
The content that this specification is not described in detail belongs to prior art known to professional and technical personnel in the field.
Claims (10)
1. fault of construction Rapid non-destructive testing device under a kind of high-speed iron rail, it is characterised in that it includes railway monitoring car
(1), signal transmitter unit (4), signal receiving unit (5), super mangneto transducer (2), hub-type vibrating sensor (3), modulus
Converting system (6) and processor (7), the signal transmitter unit (4), signal receiving unit (5), super mangneto transducer (2) and
Hub-type vibrating sensor (3) is arranged on railway monitoring car (1), and the super mangneto transducer (2) is used to exist vertically downward
500HZ~10kHZ high frequency elastic wave signal is excited on tested fragment-free track slab (10)；The vibration control of the processor (7)
Signal output part connects the signal input part of super mangneto transducer (2) by signal transmitter unit (4), and the hub-type vibration passes
The signal input part of the signal output part connection signal receiving unit (5) of sensor (3), the signal output of signal receiving unit (5)
The signal input part of end connection A/D conversion system (6), the signal output part connection processor (7) of A/D conversion system (6)
Reflected signal input is vibrated, the hub-type vibrating sensor (3) is when track monitoring car (1) detects to railroad track
Rolled on tested fragment-free track slab (10) and detect the reflecting vibrations signal of high frequency elastic wave signal.
2. fault of construction Rapid non-destructive testing device under high-speed iron rail according to claim 1, it is characterised in that：It is described
The vibration signal transmitting terminal of super mangneto transducer (2) is located at same straight line, the hub-type with hub-type vibrating sensor (3)
Centre wheel in vibrating sensor (3) can roll in downline road direction on tested fragment-free track slab (10).
3. fault of construction Rapid non-destructive testing device under high-speed iron rail according to claim 1, it is characterised in that：It is described
Hub-type vibrating sensor (3) is made up of four vibrating sensors and centre wheel, and four vibrating sensors are circumferentially pressed between 90 degree
Every being uniformly embedded on the wheel face of centre wheel.
4. fault of construction Rapid non-destructive testing device under high-speed iron rail according to claim 1, it is characterised in that：It is also
Including memory cell (8) and display unit (9), the data of the data storage end connection memory cell (8) of the processor (7) are deposited
Chu Duan, the signal input part of the display signal output part connection display unit (9) of the processor (7).
5. fault of construction Rapid non-destructive testing device under high-speed iron rail according to claim 1, it is characterised in that：It is described
Spacing range between the vibration signal transmitting terminal and hub-type vibrating sensor (3) of super mangneto transducer (2) for 0.05~
0.2m。
6. fault of construction fast non-destructive detection method, its feature under a kind of high-speed iron rail using claim 1 described device
It is, it comprises the following steps：
Step 1：The railway monitoring car (1) is arranged on tested fragment-free track slab (10)；
Step 2：Processor (7) sends oscillation control signal, and oscillation control signal is conveyed to super magnetic by signal transmitter unit (4)
Transducer (2) is caused, super mangneto transducer (2) is according to the oscillation control signal of reception vertically downward in tested fragment-free track slab (10)
On excite 500HZ~10kHZ high frequency elastic wave signal；
Step 3：By the high frequency elastic wave signal that super mangneto transducer (2) excites run into it is more below tested fragment-free track slab (10)
Layer concrete component gap, leakiness defect and CA screeds come to nothing these porous mediums of face when can produce upward reflection
Ripple, hub-type vibrating sensor (3) collection reflection wave signal, and the reflection wave signal collected is passed through into signal receiving unit
(5) it is conveyed to processor (7)；
Step 4：Processor (7) carries out Hilbert-Huang transform to reflection wave signal first, then by successively to Hilbert
Huang result carries out the spread speed point in digital filtering, remarkable spectrum analysis, the in-orbit lower multilayer mixed mud component of elastic wave
Analysis is handled, and elastic wave radar profile and remarkable spectrogram is obtained, by entering to elastic wave radar profile and remarkable spectrogram
Below the i.e. recognizable tested fragment-free track slab (10) of row manual analysis with the presence or absence of fragment-free track slab gap, concrete leakiness or
Supporting course bottom cavity defect.
7. fault of construction fast non-destructive detection method under high-speed iron rail according to claim 6, it is characterised in that：Pass through
It is good for tested fragment-free track slab (10) rectangular structure when carrying out manual analysis to elastic wave radar profile and remarkable spectrogram
Good section, elastic wave radar profile waveform is completely regular, and in normal attenuation form, it is steady that remarkable spectrogram shows as dominant frequency
Determine, integral into unimodal form, fragment-free track slab gap, concrete leakiness be present for surveying fragment-free track slab (10) rectangular structure
Or the situation of supporting course bottom cavity defect, elastic wave radar profile shows as waveform disorder, discontinuous seismic event feature, tall and erect
More spectrogram shows as dominant frequency decline, multimodal morphological feature is presented.
8. fault of construction fast non-destructive detection method under high-speed iron rail according to claim 6, it is characterised in that：It is described
In step 1, the railway monitoring car (1) is arranged on when on tested fragment-free track slab (10) in hub-type vibrating sensor (3)
One vibrating sensor is posted on tested fragment-free track slab (10)；
Also include step 5 after the step 4：Railway monitoring car (1) moves forward hub-type vibrating sensor (3) center along track
The 1/4 of girth is taken turns, then the inspection operation of repeat step 2~4.
9. fault of construction fast non-destructive detection method under high-speed iron rail according to claim 6, it is characterised in that：In quilt
Survey fragment-free track slab (10) upper edge line direction side by side parallel mark a plurality of survey line (11), to each survey line by step 1~
The method of step 5 carries out detection operation.
10. fault of construction fast non-destructive detection method under high-speed iron rail according to claim 6, it is characterised in that：Institute
State in step 3, the acquisition time of hub-type vibrating sensor (3) collection reflection wave signal is 1~2ms.
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| CN108387642A (en) * | 2018-02-11 | 2018-08-10 | 石家庄铁道大学 | Non-fragment orbit detection device and method |
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| CN111830136A (en) * | 2020-08-07 | 2020-10-27 | 中铁第一勘察设计院集团有限公司 | Ballastless track concrete structure damage detection method based on stress wave |
| CN111855714A (en) * | 2020-07-20 | 2020-10-30 | 河南城建学院 | Detection device and detection method for cement concrete pavement void disasters |
| CN114371365A (en) * | 2022-01-12 | 2022-04-19 | 国网浙江省电力有限公司电力科学研究院 | Cable defect positioning method, equipment and storage medium |
| CN115881079A (en) * | 2023-02-16 | 2023-03-31 | 山东铁路投资控股集团有限公司 | Noise early warning method, system, equipment and storage medium in railway track construction |
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| CN114371365A (en) * | 2022-01-12 | 2022-04-19 | 国网浙江省电力有限公司电力科学研究院 | Cable defect positioning method, equipment and storage medium |
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