CN214372614U - Signal capturing system and tunnel health detection system - Google Patents
Signal capturing system and tunnel health detection system Download PDFInfo
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- CN214372614U CN214372614U CN202120110956.2U CN202120110956U CN214372614U CN 214372614 U CN214372614 U CN 214372614U CN 202120110956 U CN202120110956 U CN 202120110956U CN 214372614 U CN214372614 U CN 214372614U
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Abstract
The utility model discloses a signal capture system, include: the fiber grating sensor comprises a fiber grating sensor individual or a distributed array formed by the fiber grating sensor individual and a fiber grating demodulator, wherein the fiber grating demodulator is connected with the fiber grating sensor or the array formed by the fiber grating sensor through a signal transmission fiber optic cable; the fiber grating sensor or the distributed array senses the environment parameters of the tunnel and/or the state parameters of the artifacts arranged in the tunnel, and transmits the sensing signals to the fiber grating demodulator through the signal transmission fiber optic cable. The system has strong anti-interference capability in transmission by adopting optical signals, is simple in field layout and suitable for long-term remote signal transmission, does not need to arrange control equipment on the field, and does not need to provide a special power supply for the fiber bragg grating sensor; the acquisition and transmission process is not influenced by complex electromagnetic environment in the tunnel. Further the utility model also discloses a tunnel health detection system.
Description
Technical Field
The utility model relates to a district tunnel monitoring technology field in the track traffic, in particular to signal capture system and tunnel health detection system.
Background
The rail transit system comprises a large number of interval tunnels, and the safety of the tunnels and the effective operation of equipment in the tunnels are key parts of the stable operation of the whole rail transit system. Therefore, the health state of the tunnel and the artificial objects arranged in the tunnel can be acquired in time, and the judgment of whether the potential safety hazard exists is particularly necessary.
Taking a tunnel fan as an example, the existing online monitoring system can monitor the vibration and loosening conditions of various parts such as the fan, a bracket, a bolt and the like in real time, and can perform fan fault analysis and early warning protection. The electric measurement method adopts a strain resistor, has low precision, poor anti-interference capability and short service life, needs a power supply on site, is difficult to transmit signals in a long distance and is not suitable for long-term monitoring. The control equipment needs to be arranged on site for data acquisition and analysis, and the analysis result is uploaded to the control center through the Ethernet, and the control center is not provided with a data analysis function and a data processing function.
In view of the above, how to provide a signal capturing system and a tunnel health detection system that have strong anti-interference capability, long service life, and fast and convenient layout and are suitable for long-term remote centralized monitoring becomes a technical problem that needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a strong interference killing feature, longe-lived, the simple signal capture system who is fit for long-term remote centralized monitoring is laid to the scene. And analyzing the captured signals to obtain the tunnel health information.
In order to realize the purpose, the utility model discloses a technical scheme be:
a signal capture system, comprising:
the fiber grating sensor comprises a fiber grating sensor individual or a distributed array formed by the fiber grating sensor individual and a fiber grating demodulator, wherein the fiber grating demodulator is connected with the fiber grating sensor or the array formed by the fiber grating sensor through a signal transmission fiber optic cable;
the fiber grating sensor or the distributed array senses the environment parameters of the tunnel and/or the state parameters of the artifacts arranged in the tunnel, and transmits the sensing signals to the fiber grating demodulator through a signal transmission fiber optic cable.
Preferably, the fiber grating sensor is one or more of a fiber grating tension sensor, a fiber grating temperature sensor, a fiber grating displacement sensor, a fiber grating gap sensor and a fiber grating vibration sensor, and the environmental parameter and/or the state parameter is/are a tension parameter, a temperature parameter, a displacement parameter, a gap parameter and a vibration state parameter.
Preferably, the fiber grating sensor is a coordinatable two-dimensional fiber grating vibration pickup, the coordinatable two-dimensional fiber grating vibration pickup is arranged on a fan arranged in the tunnel and a bearing platform structure for mounting the fan, the coordinatable two-dimensional fiber grating vibration pickup comprises a housing, two cantilever beams which vibrate in a single dimension and have equal strength are arranged in the housing, the vibration directions of the two cantilever beams which vibrate in the single dimension are mutually perpendicular, and the two cantilever beams which vibrate in the single dimension are both provided with fiber gratings, so that the strain of the fiber gratings is caused when the cantilever beams are forced to vibrate, and the central wavelength of the reflected light of the fiber gratings is changed.
Preferably, the two cantilever beams are respectively arranged on two flat plates which are perpendicular to each other, the end parts of the two flat plates are mutually connected and fixed, any flat plate consists of a vibration area and a shell connecting area which is arranged on one side of the vibration area, which is far away from the other flat plate, and the shell connecting area is fixedly connected with the shell; the vibration areas of the two flat plates are connected with each other, a slit is arranged on each vibration area, the slit is arranged along the outline direction of the vibration areas, the vibratable parts formed by dividing the slit on each vibration area form the cantilever beam, and each vibration area is triangular or trapezoidal.
Preferably, the fiber grating sensor or the distributed array is connected to a plurality of branch optical paths, each branch optical path is connected to a main optical cable through an optical cable junction box, and each branch optical cable is connected to the fiber grating demodulator through the main optical cable.
Preferably, the fiber grating demodulator demodulates the laser reflected from the fiber grating sensor and obtains a wavelength signal of the reflected laser
A tunnel health detection system is characterized by comprising the signal capturing system; the signal processing system is connected with the signal capturing system; the signal processing system analyzes the tunnel and/or the safety state of the artificial object arranged in the tunnel based on the acquired environment parameters of the tunnel and/or the state parameters of the artificial object arranged in the tunnel.
Preferably, when the state parameter is a vibration state parameter, a characteristic spectrum of the vibration of the artificial object is obtained based on the vibration state parameter, and the characteristic spectrum is trended to obtain the current state of the artificial object and the remaining safe life.
Preferably, the signal capturing system and the signal processing system are remotely connected by wire or wireless.
The beneficial effects of the utility model reside in that: the device is suitable for various monitoring medium conditions of tunnels and various artifacts in the tunnels; the method has excellent environmental adaptability and wavelength and temperature mutual compensation; the data acquisition network can adapt to various networking modes; the system has extensibility and compatibility, can be expanded by detecting data requirements, can monitor interval tunnel equipment and structural engineering on line in real time, and can analyze structural health trend by utilizing big data; the intelligent bus station is an important component of intelligent station construction.
Drawings
Fig. 1 is a schematic structural diagram of a signal capturing system and a tunnel health detection system provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the two-dimensional fiber grating vibration pickup device provided by the embodiment of the present invention, which is disposed on the fan and the bearing platform structure;
fig. 3 is a schematic structural diagram of a cantilever beam in a tunable two-dimensional fiber grating vibration pickup according to an embodiment of the present invention;
fig. 4 is a schematic view of the structure of the cantilever beam of fig. 3.
The labels in the figure are: the vibration sensing device comprises a shell 1, a connecting groove 101, a connecting boss 102, a second bolt connecting hole 103, a vibration area 2, a cantilever beam 201, a slot 202, a packaging groove 203, a fiber grating 3, a shell connecting area 4, a first bolt connecting hole 401, a mass block connecting column 5, a mass block 6, a fan 7, a bearing platform 8 and a coordinatable two-dimensional fiber grating vibration pickup 9.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1
Referring to fig. 1 to 4, an embodiment of the present invention partially discloses a signal capturing system, including: the fiber grating sensor comprises a fiber grating sensor individual or a distributed array formed by the fiber grating sensor individual and a fiber grating demodulator, wherein the fiber grating demodulator is connected with the fiber grating sensor or the array formed by the fiber grating sensor through a signal transmission fiber optic cable; the fiber grating sensor or the distributed array senses the environment parameters of the tunnel and/or the state parameters of the artifacts arranged in the tunnel, and transmits the sensing signals to the fiber grating demodulator through the signal transmission fiber optic cable.
Therefore, the device is mainly used in the field of rail transit, is mainly applied to tunnels of subways and light rails and is arranged in the tunnels and on artifacts in the tunnels based on use requirements, and the artifacts in the tunnels comprise buildings, structures and electromechanical equipment. The environmental parameters and the state parameters are respectively determined based on safety monitoring requirements, and can be combined according to actual use requirements, and specifically comprise temperature and humidity parameters, strain (displacement) parameters, vibration acceleration parameters, amplitude parameters and the like. The parameters can be acquired through corresponding fiber bragg grating sensors. In practice, vibration parameters of an artificial object are generally acquired, namely, a fiber bragg grating vibration sensor is arranged on the artificial object, and temperature and humidity parameters, strain (displacement) parameters and the like are acquired for a tunnel.
The signal capturing system has strong anti-interference capability and long service life in transmission by adopting optical signals, is simple to arrange on site and suitable for long-term remote signal transmission, directly transmits all acquired data to a station or control center equipment through a signal transmission optical fiber cable, does not need to arrange control equipment on site, and does not need to provide a special power supply for the fiber bragg grating sensor; the acquisition and transmission process is not influenced by complex electromagnetic environment in the tunnel.
In this embodiment, the fiber grating sensor is one or more of a fiber grating tension sensor, a fiber grating temperature sensor, a fiber grating displacement sensor, a fiber grating gap sensor, and a fiber grating vibration sensor, and the environmental parameter and/or the state parameter corresponds to a tension parameter, a temperature parameter, a displacement parameter, a gap parameter, and a vibration state parameter.
Therefore, the fiber bragg grating sensor with high use frequency and the corresponding acquired parameters are disclosed, and a user can select and combine the fiber bragg grating sensor conveniently.
In this embodiment, the fiber grating sensor is a coordinatable two-dimensional fiber grating vibration pickup 9, the coordinatable two-dimensional fiber grating vibration pickup is arranged on a fan 7 arranged in the tunnel and a bearing platform structure 8 on which the fan is mounted, and the coordinatable two-dimensional fiber grating vibration pickup 9 senses vibration parameters of the fan 7 and the bearing platform structure 8 on which the fan is mounted; can coordinate two dimension fiber grating vibration pickup includes the casing, is provided with the cantilever beam of two unidimensional vibrations and uniform strength in the casing, and the vibration direction mutually perpendicular of the cantilever beam of two unidimensional vibrations all is provided with fiber grating on the cantilever beam of two unidimensional vibrations, causes fiber grating's strain when the cantilever beam is forced to vibrate, leads to fiber grating's reverberation center wavelength to change.
Thus, the vibration pick-up is adjusted when in use, so that the natural frequency of the cantilever beam is the same as that of the object to be measured, and the sensitivity of the vibration pick-up is improved by generating resonance with the object to be measured. Cantilever beam surface mounting fiber grating, the testee vibrates and drives the cantilever beam and produce forced vibration, cantilever beam forced vibration back, carry out the tension and compression of band-spectrum characteristic to fiber grating respectively, and then drive fiber grating's central wavelength and change, use time as the coordinate to demodulate into the data packet with fiber grating wavelength through fiber grating demodulator, send server software and carry out data analysis, through the frequency spectrum characteristic of reading fiber grating central wavelength change, just can know by monitoring department's structure forced vibration intensity, data such as intensity, through software algorithm, reflect the state of monitoring the object, accomplish the monitoring to the testee. The two cantilever beams can receive vibration waves in two directions simultaneously, have the function of demodulating the waves generated by the measured object according to two dimensions, monitor the parameter information of the vibration waves in the two dimensions respectively and then coordinate. The vibration of the measured object is monitored in two dimensions at the same time.
The vibration pickup has two-dimensional vibration sensitivity and tunability, can reduce the cost of a monitoring system and reduce the using quantity of the vibration pickup, transmits data through the fiber bragg grating, and has excellent electromagnetic environment adaptability. The device can also be embedded into a concrete soil structure for adapting to the monitoring of the concrete structure or arranged on a steel structure to complete the monitoring of the steel structure; of course, the device can also be applied to the field of vibration environment monitoring.
In the embodiment, the two cantilever beams are respectively arranged on two flat plates which are vertical to each other, the end parts of the two flat plates are connected and fixed with each other, any flat plate consists of a vibration area and a shell connecting area which is arranged on one side of the vibration area, which is far away from the other flat plate, and the shell connecting area is fixedly connected with a shell; the vibration areas of the two flat plates are connected with each other, a slit is arranged on each vibration area and arranged along the outline direction of the vibration area, the vibratable parts formed by the slits on the vibration areas in a separated mode form a cantilever beam, and each vibration area is triangular or trapezoidal.
Thus, it is disclosed how two cantilever beams can be arranged with equal strength through the structure and forced vibration of two dimensions can be realized. The structure and the material of the two cantilever beams are completely the same. The two cantilever arms can be arranged in an L shape or a straight shape in space. The two flat plates are connected and fixed, so that the two cantilever beams can be simultaneously forced to vibrate, and the two cantilever beams are simultaneously excited by the same seismic source. The structure can better ensure that the forced vibration in the single dimension direction is realized, and the vibration in the vertical vibration direction is well limited.
In this embodiment, a mass 6 is provided on the end of the cantilever beam 201.
Thus, the natural frequency of the cantilever beam is tuned by the mass 6. The mass block 6 is connected and fixed with a mass block connecting column 5 arranged at the end part of the cantilever beam 201. The mass blocks with different specifications are replaced to monitor the measured objects with different natural frequencies.
In this embodiment, the fiber grating sensor or distributed array is connected in a plurality of branch optical paths, each branch optical path is connected with the main optical cable through a cable closure, and the main optical cable connects each branch optical cable to the fiber grating demodulator.
Therefore, a plurality of fiber grating sensors are conveniently arranged to form an array, and different types of fiber grating sensors are conveniently arranged to construct collecting paths with different parameters.
In this embodiment, the fiber grating demodulator demodulates the laser reflected from the fiber grating sensor, and obtains a wavelength signal of the reflected laser.
Thus, signal transmission using light can effectively resist battery interference.
A tunnel health detection system comprises the signal capture system; the signal processing system is connected with the signal capturing system; and the signal processing system analyzes the safety state of the tunnel and/or the artificial object arranged in the tunnel based on the acquired environment parameters of the tunnel and/or the state parameters of the artificial object arranged in the tunnel.
Therefore, there are various methods for determining the installation state based on the collected environmental parameters and the state parameters, which are generally compared with a preset threshold, and if the collected environmental parameters and the environmental parameters are greater than the preset threshold, it is determined that the dangerous state is a safe state, otherwise. Or ranking all tunnel detection data on the whole intersection line according to detection values, calibrating parameters which are ranked earlier according to a fixed proportion to be in a state to be detected, and calibrating the rest to be in an installation state.
In this embodiment, when the state parameter is a vibration state parameter, a characteristic spectrum of vibration of the artifact is obtained based on the vibration state parameter, and the vibration spectrum is trended to obtain a current state of the artifact and a remaining safe life.
Therefore, the characteristic frequency spectrum of the fan vibration is obtained by utilizing the sensitivity of the two-dimensional fiber grating vibration pickup to the fan vibration frequency, and the structure safety condition is obtained by performing trend analysis and data processing on the frequency spectrum characteristic information. The trend analysis establishes a structure safety evolution model by collecting a large amount of sample data, and the model is used as a comparison standard. And inputting the currently detected characteristic frequency spectrum correspondingly, and calculating according to the evolution model based on the currently detected data to obtain the current state of the fan and the residual service life.
In this embodiment, the signal capturing system and the signal processing system are connected remotely by wire or wirelessly.
Therefore, the separation of data acquisition and data processing is realized, the actual adaptive requirements are matched, and the detection networking is realized.
Claims (8)
1. A signal capture system, comprising:
the fiber grating sensor comprises a fiber grating sensor individual or a distributed array formed by the fiber grating sensor individual and a fiber grating demodulator, wherein the fiber grating demodulator is connected with the fiber grating sensor or the array formed by the fiber grating sensor through a signal transmission fiber optic cable;
the fiber grating sensor or the distributed array senses the environment parameters of the tunnel and/or the state parameters of the artifacts arranged in the tunnel, and transmits the sensing signals to the fiber grating demodulator through the signal transmission fiber optic cable.
2. The signal capturing system of claim 1, wherein the fiber grating sensor is one or more of a fiber grating strain sensor, a fiber grating temperature sensor, a fiber grating displacement sensor, a fiber grating gap sensor, and a fiber grating vibration sensor, and the environmental parameter and/or the status parameter corresponds to a strain parameter, a temperature parameter, a displacement parameter, a gap parameter, and a vibration status parameter.
3. The signal capturing system as claimed in claim 1 or 2, wherein the fiber grating sensor is a tunable two-dimensional fiber grating sensor, the tunable two-dimensional fiber grating sensor is disposed on a fan disposed in the tunnel and a bearing platform structure on which the fan is mounted, the tunable two-dimensional fiber grating sensor includes a housing, two cantilever beams vibrating in one dimension and having equal strength are disposed in the housing, vibration directions of the two cantilever beams vibrating in one dimension are perpendicular to each other, and a fiber grating is disposed on each of the two cantilever beams vibrating in one dimension, and when the cantilever beams are forced to vibrate, strain of the fiber grating is caused, which causes a change in a central wavelength of reflected light of the fiber grating.
4. The signal capturing system of claim 3, wherein the two cantilevers are respectively disposed on two plates perpendicular to each other, ends of the two plates are connected and fixed to each other, and each plate is composed of a vibration region and a housing connecting region disposed on a side of the vibration region away from the other plate, and the housing connecting region is fixedly connected to the housing; the vibration areas of the two flat plates are connected with each other, a slit is arranged on each vibration area, the slit is arranged along the outline direction of the vibration areas, the vibratable parts formed by dividing the slit on each vibration area form the cantilever beam, and each vibration area is triangular or trapezoidal.
5. The signal capture system of claim 1, wherein the fiber grating sensor or the distributed array is connected in a plurality of branch optical paths, each branch optical path connected to a main cable by a cable closure, each branch cable connected by the main cable to a fiber grating demodulator.
6. The signal capture system of claim 1, wherein the fiber grating demodulator demodulates the laser light reflected from the fiber grating sensor and derives a wavelength signal of the reflected laser light.
7. A tunnel health detection system comprising a signal capture system according to any one of claims 1-6; the signal processing system is connected with the signal capturing system; the signal processing system analyzes the tunnel and/or the safety state of the artificial object arranged in the tunnel based on the acquired environment parameters of the tunnel and/or the state parameters of the artificial object arranged in the tunnel.
8. The tunnel health detection system of claim 7, wherein the signal capture system is remotely connected to the signal processing system by wired or wireless means.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120110956.2U CN214372614U (en) | 2021-01-15 | 2021-01-15 | Signal capturing system and tunnel health detection system |
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| CN202120110956.2U CN214372614U (en) | 2021-01-15 | 2021-01-15 | Signal capturing system and tunnel health detection system |
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| CN214372614U true CN214372614U (en) | 2021-10-08 |
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Address after: 100078 501, 503, 5th floor, building 15, fangchengyuan 1st District, Fengtai District, Beijing Patentee after: CRRC Intelligent Transportation Engineering Technology Co.,Ltd. Address before: 100078 501, 503, 5th floor, building 15, fangchengyuan 1st District, Fengtai District, Beijing Patentee before: CRRC CONSTRUCTION ENGINEERING Co.,Ltd. |