CN108279037A - A kind of method for arranging of underground railway track structure real-time monitoring system - Google Patents
A kind of method for arranging of underground railway track structure real-time monitoring system Download PDFInfo
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- CN108279037A CN108279037A CN201711458164.9A CN201711458164A CN108279037A CN 108279037 A CN108279037 A CN 108279037A CN 201711458164 A CN201711458164 A CN 201711458164A CN 108279037 A CN108279037 A CN 108279037A
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Classifications
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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Abstract
The present invention discloses a kind of method for arranging of underground railway track structure real-time monitoring system, and the method step includes：S1, the monitoring content that monitoring system is obtained using finite element software and monitoring position；S2, according to the obtained monitoring contents of S1 and monitoring position, choose fiber bragg grating sensor type；S3, mounting arrangements are carried out to the fiber-optic grating sensor that S2 chooses.The mounting arrangements method of fiber-optic grating sensor in specification of the present invention underground railway track system, it plays and saves the sensor set-up time, it ensure that the effect of sensor installation quality and stability, improve the reliability of sensor gathered data, for underground railway track system, in the non-skylight phase, monitoring provides safe and reliable support, also provides reliable guarantee for the safety of train, even running.
Description
Technical field
The present invention relates to underground railway track system monitor technique fields.It is real-time more particularly, to a kind of underground railway track structure
The method for arranging of monitoring system.
Background technology
Underground railway track structure is railcar operation basis, and the state of track structure determines degree of passenger comfort, safety
And transport capacity.In the case where train high density is run and the underground railway track railroad embankment environment of various complexity, track knot
Structure is as the basis for directly bearing High-speed Train Loads, the gradual hurt of component, deterioration, bridge, tunnel face, changeover portion, curve,
Disease easily occurs for the key areas such as track switch, causes great safety accident, causes great loss.For subway line, by
It is big in conveying people density, train track the time it is short the features such as, determine its can maintenance time only in the skylight period at night, dimension
It repaiies that the activity duration is short, and operating environment is poor, is not only difficult to find disease in time, and on-call maintenance is also difficult to the disease occurred,
Therefore it needs to carry out effective monitoring to underground railway track system.
Currently, the domestic monitoring for underground railway track system, mostly uses artificial detection and the rail inspection in skylight period at night
The dynamic detection of vehicle, it is difficult to grasp the state of underground railway track system in real time, disease once occurs being difficult to find in time, to influence
The safety of driving.
In underground railway track system aspects, based on the monitoring of fiber-optic grating sensor still in the preliminary practice stage, not yet
There is complete molding system to occur.Do not have particularly with mounting arrangements method of the fiber-optic grating sensor in underground railway track system
Molding codes and standards have thereby resulted in the method disunity in sensor installation process, and time-consuming for installation, the feelings such as waste of material
The quality of condition, installation is also irregular, is unfavorable for the correct effective data information of acquisition.Therefore, it is necessary to optical fiber grating sensing
Mounting arrangements method of the device in underground railway track system carries out unified design and specification.
Invention content
The purpose of the present invention is to provide a kind of method for arranging of underground railway track structure real-time monitoring system, to specification light
Mounting arrangements flow of the fiber grating sensor in underground railway track system, improves the reliability of sensor gathered data, is real
When the safe service state of monitoring rail system good technical guarantee is provided.
In order to achieve the above objectives, the present invention uses following technical proposals：
A kind of method for arranging of underground railway track structure real-time monitoring system, the method step include：
S1, the monitoring content that monitoring system is obtained using finite element software and monitoring position；
S2, according to the obtained monitoring contents of S1 and monitoring position, choose fiber bragg grating sensor type；
S3, mounting arrangements are carried out to the fiber-optic grating sensor that S2 chooses.
Preferably, the step S1 further includes：
S1.1, the finite element model that underground railway track system is established using finite element analysis software；
S1.2, statics and dynamic analysis are carried out to the finite element model of underground railway track system, obtain monitoring content and
Position is monitored,
The monitoring content includes atmospheric temperature, rail temperature, track plate temperature, rail stress, rail and track
The relative displacement of the relative displacement of plate and base board and bridge.
Preferably, include to the monitoring location arrangements fiber-optic grating sensor of the rail temperature：Optical fiber grating temperature passes
Sensor and optical fiber optical grating stress sensor.
Preferably, the step S2 includes：
S2.1, the monitoring for stress establish fiber-optic grating sensor model using finite element software, are passed to fiber grating
Sensor model is tested, and optical fiber optical grating stress sensor is chosen；
S2.2, it is directed to temperature monitoring, selects fiber-optical grating temperature sensor；
S2.3, it is directed to displacement monitoring, selects fiber grating displacement sensor.
Preferably, the optical fiber optical grating stress sensor is using copper, the substrate of aluminium material or other chemical industry synthesis materials, base
Piece thickness is not more than the butterfly sheet type sensor of 1mm；
The range of the fiber-optical grating temperature sensor is -25 DEG C -80 DEG C, and measurement accuracy is 0.1 DEG C；
The range of the fiber grating displacement sensor is ± 25mm, measurement accuracy 0.1mm.
Preferably, the step S3 includes：
S3.1, fiber-optical grating temperature sensor is arranged in track plates, rail and atmospheric environment；
S3.2, optical fiber optical grating stress sensor is arranged on rail；
S3.3, fiber grating displacement sensor is arranged in rail bottom-track plates, base board-bridge.
Beneficial effects of the present invention are as follows：
The characteristics of present invention incorporates subway scene complex environments, finite element and examination have been carried out for fiber-optic grating sensor
Analysis is tested, the fiber-optic grating sensor type than selecting is more suitable for underground railway track system.According to the content of monitoring and ground iron hoop
Border feature, the installation for the fiber-optic grating sensor that research and design is acquired for information such as temperature, ess-strain and displacements
Method for arranging simplifies and the flow of specification sensor installation on the basis of ensureing that sensor gathered data is reliable and stable, contracting
The characteristics of short time of mounting arrangements has convenient construction, saves time and economic cost can be the safety of subway train
Even running provides more reliable safety guarantee.
Description of the drawings
Specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.
Fig. 1 shows a kind of method for arranging flow chart of underground railway track structure real-time monitoring system；
Fig. 2 shows the schematic diagrames of optical fiber optical grating stress sensor；
Fig. 3 shows the flow diagram of optical fiber optical grating stress-temperature sensor installation；
Fig. 4 shows the Installation Example figure of optical fiber optical grating stress-temperature sensor；
Fig. 5 shows the schematic diagram of track plates temperature in borehole sensor distribution；
Fig. 6 shows to measure the schematic diagram of the fiber-optical grating temperature sensor installation procedure of track plates temperature gradient；
Fig. 7 shows the layout drawing of atmospheric temperature measurement point；
Fig. 8 shows the installation procedure schematic diagram of the fiber grating displacement sensor of rail-track plates relative displacement；
Fig. 9 shows the Installation Example figure of the fiber grating displacement sensor of rail-track plates relative displacement；
Figure 10 shows the installation procedure schematic diagram of the fiber grating displacement sensor of base board-bridge relative displacement.
In figure：1, protective cover；2, patch type optical fiber optical grating stress sensor；3, the first fiber-optical grating temperature sensor；4、
Fixing device；5, rail；6, iron wire is positioned；7, the second fiber-optical grating temperature sensor；8, track plates；9, screed；10, pedestal
Plate；11, thermometer screen fixed link；12, fixed protective cover；13, sonde-type fiber-optical grating temperature sensor；14, thermometer screen；15, it presss from both sides
Block；16, steel wire rope；17, fiber grating displacement sensor protective device.
Specific implementation mode
In order to illustrate more clearly of the present invention, the present invention is done further with reference to preferred embodiments and drawings
It is bright.Similar component is indicated with identical reference numeral in attached drawing.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, being a kind of method for arranging flow chart of underground railway track structure real-time monitoring system.The present invention is based on ground
Iron environmental quality obtains monitoring content and survey after being analyzed scene progress sensitizing range first with finite element software
Point position；According to obtained monitoring content and point position, to for monitoring temperature, stress and the fiber-optic grating sensor of displacement
Mounting arrangements method be designed and specification, wherein combining shape of the experiment to optical fiber optical grating stress sensor using finite element
Shape, material, thickness etc. are analyzed, and are suitable for the optical fiber optical grating stress sensor of underground railway track system than selecting.To optical fiber light
Gate sensor is according to the difference of monitoring content, respectively different sensor, by fiber-optical grating temperature sensor when to temperature monitoring
In atmospheric environment, track plates, rail；When to stress monitoring, optical fiber optical grating stress sensor is arranged on rail；Displacement is supervised
When survey, fiber grating displacement sensor is arranged in rail-track plates, bridge-base board.The sensor of arrangement at the scene passes through
Optical cable demodulates data by tidal data recovering to splice tray, then by fiber Bragg grating (FBG) demodulator, is finally delivered to server
In.
It is illustrated in figure 2 the schematic diagram of several optical fiber optical grating stress sensors of different shapes.The optical fiber that the present invention uses
Grating technology is made using the characteristic of the space phase grating in fiber grating fibre core using made of the light sensitivity in optical fiber
At various fibre optical sensors.When the temperature of fiber-optic grating sensor local environment, stress and displacement etc. change, grating
Period or fiber core refractive index will change, to make the wavelength of reflected light change, by the change for measuring reflected light wavelength
Change, so that it may to obtain the situation of change of measured physical quantity.The present invention utilizes this feature of fiber grating, first to measuring rail
Fiber-optic grating sensor carried out design than choosing optimization.Using finite element analysis software ABAQUS, different shape, thickness are established
Fiber grating-rail components limit element artificial module of degree, material passes through rail strain and nothing under different condition in conjunction with experiment
Rail, substrate strain difference under substrate condition, analyze various FBG strain gauges, are more suitable for rail track to choose
The optical fiber optical grating stress sensor of component long term monitoring.Preferably, using the lower copper of rigidity, aluminium material or other chemical industry synthesis
The substrate of material, the substrate thickness are not more than the butterfly sheet type sensor of 1mm.
In order to make the technique effect of the technical solution adopted by the present invention and acquirement it can be readily appreciated that with reference to preferred embodiment
And attached drawing, the specific method for arranging of fiber-optic grating sensor of the present invention is described further.
Embodiment one
This example provides one while measuring the method for arranging of the fiber-optic grating sensor of rail stress and rail temperature.
The variation of rail temperature can make infrastructure generation expand with heat and contract with cold, and rail is caused to generate larger stress.Therefore it needs simultaneously to steel
The stress and temperature of rail are paid close attention to, and prevent rail expansion, broken rail and the broken curved generation of rail, and then monitor to rail temperature
When need to be simutaneously arranged fiber-optical grating temperature sensor and optical fiber optical grating stress sensor.As shown in figure 3, for the optical fiber light on rail
The installation procedure schematic diagram of grid stress-temperature sensor.According to above-mentioned installation procedure, the peace of this example as shown in Figure 4 is obtained
Fill instance graph.The range of temperature sensor is -25 DEG C -80 DEG C in this example, and measurement accuracy is 0.1 DEG C.First in rail 5
The position that installation equipment is determined on the web of the rail, processing of rust removing is done to point position；Fixing device for installing 4 below burnishing part；Solid
Determine to install protective cover 1 on device 4 additional；Patch type optical fiber optical grating stress sensor 2 is fixed in the form of pasting entirely using strain gage adhesive
At the web of the rail of rail 5；The optical fiber of patch type optical fiber optical grating stress sensor 2 is welded with optical fiber bonding machine, has been welded
After light loss is prevented around a few optical fiber in protective cover 1；Steel viscose glue is coated on the screw tightened after covering protective cover 1, is prevented
Only protective shell is caused to fall off since rail vibration is excessive；Silica gel is coated at the connection jaws of 1 both sides of protective cover simultaneously and carries out waterproof
Processing, bursting by freezing after avoiding winter optical fiber from making moist；It crosses rail optical fiber cable to be wrapped up with rubber tube, is connected to cable box, is fixed with buckle；
Finally the sensor fiber of introducing is welded in cable box, and is connect with main cable.First fiber grating temperature sensor
Device 3 is identical as 2 installation procedure of patch type optical fiber optical grating stress sensor, is mounted in the same protective cover 1, realizes to rail 5
Temperature, stress while monitor.
Embodiment two
This example provides the detailed method for arranging of the fiber-optic grating sensor of a measurement track plate temperature.The change of temperature
Change very big on the influence of the structure of non-fragment orbit.Will produce shrinkage stress in temperature decrease, inside track plates makes concrete cracking,
And when the temperature increases, concrete slab or the structure adjoined are by high pressure, it may occur that the deformations such as tilt.Therefore it needs to nothing
The temperature gradient of tiny fragments of stone, coal, etc. track is monitored in real time.This example is based on existing research to underground railway track system sensitive regional analysis, temperature
Degree measuring point is located in track plate, edges of boards and plate angle.The monitoring of track plates temperature gradient need to be by fiber grating temperature sensor
In device embedded concrete structure, the mode of embedment is general by the way of first drilling and being embedded to afterwards.And in order to the temperature to each layer
It measures, according to every layer of thickness, the sensor that different number is arranged measures every layer of temperature, as shown in figure 5, being
Measure track plates fiber-optical grating temperature sensor installation procedure schematic diagram.Rail as shown in FIG. 6 is obtained according to above-mentioned installation procedure
Guidance tape temperature in borehole sensor distribution map.Punched with the electric drill of φ 32 first on track plates 8, ensure hole depth pass through track plates 8,
Screed 9, and arrive inside base board 10；Intercepted length positioning iron wire 6 identical with hole depth, it is corresponding in positioning iron wire 6
The second fiber-optical grating temperature sensor 7 is fixed in position installation；Then the second fiber-optical grating temperature sensor on iron wire 6 will be positioned
7 wrap after be put into hole；The exposed optical fiber drum of second fiber-optical grating temperature sensor 7 is good, it is viscous with mucilage sealing；With with rail
The cement of 8 same material of guidance tape fills up hole；Protective cover is installed above hole, and pastes reflecting marking, by all exposed optical fiber
Line carries out poling with uniform nylon rubber pipe, crosses rail partial rubber Guan Zeyong external application PE pipes and is protected, recycles expansion bolt
Pipeline is fixed in orbital plane and bridge floor.
Embodiment three
This example provides the detailed method for arranging of the fiber-optical grating temperature sensor of a measuring environment temperature.For ring
Fiber-optical grating temperature sensor is then generally mounted in shutter, as shown in Figure 7 by the monitoring of border temperature.The position of installation needs
It avoids being directly exposed under sunlight, to ensure the accuracy of environment temperature.For this purpose, thermometer screen is manufactured by national standard, using outstanding
Hang mounting means installation sonde-type fiber-optical grating temperature sensor 13.Thermometer screen 14 is fixed on to selected ambient temperature measurement point
Afterwards, ground, thermometer screen need to be fixed to by fixed protective cover 12 in 14 outside of thermometer screen plus the open fixed protective cover 12 in top
14 are fixed to by thermometer screen fixed link 11 on fixed protective cover 12.Sonde-type fiber-optical grating temperature sensor 13 is fixed on hundred
Inside leaf case 14.
Example IV
This example provides the detailed arrangement of the fiber grating displacement sensor of a measurement rail-track plates relative displacement
Method.When the length travel between rail and track plates is excessive, fastener can be caused to loosen, torque declines, and influences track geometry
The holding of morpheme, and then safety and the stationarity of train operation are influenced, so needing strictly to be controlled.Displacement sensor is logical
One connection foil gauge of steel wire is crossed, foil gauge is fixed on above sensor stand, and holder is mounted on sleeper；Other one of steel wire
It is then mounted on above the holder being fixed together with rail clamp, when generating relative displacement between rail and sleeper, by
It is tightly stuck in above rail in rail clamp, rail clamp can affect steel wire, steel wire forced belt dynamic strain piece together with rail
Deformation is generated, and grating stress is driven to be deformed.Fig. 8 is the fiber grating displacement sensor of rail-track plates relative displacement
Installation procedure schematic diagram.Fig. 9 is the Installation Example figure of the fiber grating displacement sensor of rail-track plates relative displacement.It is first
First equally in the rail foot installation rail fixture block 15 that need to install steel rail displacement sensor；In fixed fiber grating displacement sensor
It is preceding that first itself and transmission cable are welded, choose specific location of the fiber grating displacement sensor under 5 rail of rail；Then in-orbit
Punch position is marked on guidance tape 8 and is punched, and position fiber grating displacement sensor is fixed；The length of steel wire rope 16 is set again
It spends and fixes, so that it is met sensor displacement range, and fiber grating displacement sensor is installed additional to fiber grating displacement sensor
Protective device 17；The optical fiber cable of transmission is wrapped up with rubber tube, cabling to cable box, is fixed on the way with buckle, finally in electricity
The sensor fiber of introducing is welded in cable case, and is connect with main cable.The fiber grating position used in this embodiment
The range of displacement sensor is ± 25mm, measurement accuracy 0.1mm.Because measuring point is located on overpass in this example, also need
Relative displacement between bridge and base board is monitored.The relative displacement as shown in Figure 10 between base board-bridge
The installation procedure of fiber grating displacement sensor.The Fiber Bragg Grating Displacement Sensor of installation procedure and rail-track plates relative displacement
Device installation procedure is similar, and difference lies in the differences of punch position.When measuring the relative displacement of base board-bridge, respectively in bridge
The faces Liang Liang and the punching of the appropriate location of base board.
Technical solution of the present invention has carried out real-time monitoring to underground railway track, is based on Fiber Bragg Grating technology, realizes
To rail temperature, stress in underground railway track system, track plate temperature, environment temperature, rail-track plates relative displacement and pedestal
The real-time data acquisition of plate-bridge relative displacement describes the step of each section sensor is installed and detailed rules and regulations in detail.Meanwhile profit
With ABAQUS modelings and laboratory test analysis, different shape, thickness have been carried out to the fiber Bragg grating strain sensor on rail
Degree, substrate material and mounting means etc. are various preferably, it is determined that are suitable for the long-term real time on-line monitoring of underground railway track system
Fiber Bragg grating strain sensor type.The present invention is using high certainty of measurement, lightweight is small, resistance to complex environment, without drift
The advantages that fiber-optic grating sensor, solve underground railway track system real-time service state sensor in monitoring installation problem.Have
Conducive to field erected speed is accelerated, ensure the stability and accuracy of sensor data acquisition.It is carried for the operation of subway train
Safe and reliable guarantee has been supplied, there is good application prospect.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is every to belong to this hair
Row of the obvious changes or variations that bright technical solution is extended out still in protection scope of the present invention.
Claims (6)
1. a kind of method for arranging of underground railway track structure real-time monitoring system, which is characterized in that the method step includes：
S1, the monitoring content that monitoring system is obtained using finite element software and monitoring position；
S2, according to the obtained monitoring contents of S1 and monitoring position, choose fiber bragg grating sensor type；
S3, mounting arrangements are carried out to the fiber-optic grating sensor that S2 chooses.
2. a kind of method for arranging of underground railway track structure real-time monitoring system according to claim 1, which is characterized in that institute
Stating step S1 includes：
S1.1, the finite element model that underground railway track system is established using finite element analysis software；
S1.2, statics and dynamic analysis are carried out to the finite element model of underground railway track system, obtains monitoring content and monitoring
Position,
The monitoring content includes atmospheric temperature, rail temperature, track plate temperature, rail stress, rail and track plates
The relative displacement of relative displacement and base board and bridge.
3. a kind of method for arranging of underground railway track structure real-time monitoring system according to claim 2, which is characterized in that right
The monitoring location arrangements fiber-optic grating sensor of the rail temperature includes：Fiber-optical grating temperature sensor and optical fiber optical grating stress
Sensor.
4. a kind of method for arranging of underground railway track structure real-time monitoring system according to claim 1, which is characterized in that institute
Stating step S2 includes：
S2.1, the monitoring for stress establish fiber-optic grating sensor model, to fiber-optic grating sensor using finite element software
Model is tested, and optical fiber optical grating stress sensor is chosen；
S2.2, it is directed to temperature monitoring, selects fiber-optical grating temperature sensor；
S2.3, it is directed to displacement monitoring, selects fiber grating displacement sensor.
5. a kind of method for arranging of underground railway track structure real-time monitoring system according to claim 4, which is characterized in that
The optical fiber optical grating stress sensor selects the substrate of copper, aluminium material or other chemical industry synthesis materials, substrate thickness little
In the butterfly sheet type sensor of 1mm；
The fiber-optical grating temperature sensor selected range is -25 DEG C -80 DEG C, and measurement accuracy is 0.1 DEG C；
The fiber grating displacement sensor selected range is ± 25mm, measurement accuracy 0.1mm.
6. a kind of method for arranging of underground railway track structure real-time monitoring system according to claim 1, which is characterized in that institute
Stating step S3 includes：
S3.1, fiber-optical grating temperature sensor is arranged in track plates, rail and atmospheric environment；
S3.2, optical fiber optical grating stress sensor is arranged on rail；
S3.3, fiber grating displacement sensor is arranged in rail bottom-track plates, base board-bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458164.9A CN108279037B (en) | 2017-12-28 | 2017-12-28 | Arrangement method of real-time monitoring system for subway rail structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458164.9A CN108279037B (en) | 2017-12-28 | 2017-12-28 | Arrangement method of real-time monitoring system for subway rail structure |
Publications (2)
| Publication Number | Publication Date |
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| CN108279037A true CN108279037A (en) | 2018-07-13 |
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| CN109291954A (en) * | 2018-11-28 | 2019-02-01 | 华东交通大学 | Embedded intelligent rail of one kind and preparation method thereof |
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| US20200231194A1 (en) * | 2017-09-22 | 2020-07-23 | Thales Management & Services Deutschland Gmbh | Method for mounting a rail monitoring element |
| CN112097884A (en) * | 2020-06-09 | 2020-12-18 | 承德石油高等专科学校 | Dynamic rail weighing fiber grating pressure sensor with flexible amplifying structure |
| CN113405590A (en) * | 2021-05-06 | 2021-09-17 | 中车青岛四方机车车辆股份有限公司 | Device, system and method for testing states of key components of railway vehicle |
| CN113548086A (en) * | 2021-09-18 | 2021-10-26 | 北京全路通信信号研究设计院集团有限公司 | Axle counting method and axle counting system based on wheel-rail coupling shearing force detection |
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| CN114264338A (en) * | 2021-12-29 | 2022-04-01 | 中铁第四勘察设计院集团有限公司 | BIM-based grating array track monitoring information visualization analysis method and system |
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| CN113548086A (en) * | 2021-09-18 | 2021-10-26 | 北京全路通信信号研究设计院集团有限公司 | Axle counting method and axle counting system based on wheel-rail coupling shearing force detection |
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| CN114112103B (en) * | 2021-09-29 | 2024-04-26 | 中铁第四勘察设计院集团有限公司 | Plate-type ballastless track and full-line temperature field monitoring system and health monitoring method thereof |
| CN114264338A (en) * | 2021-12-29 | 2022-04-01 | 中铁第四勘察设计院集团有限公司 | BIM-based grating array track monitoring information visualization analysis method and system |
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