CN116242426B - Large-span space structure health supervision system and method thereof - Google Patents
Large-span space structure health supervision system and method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000012544 monitoring process Methods 0.000 claims abstract description 91
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 230000005284 excitation Effects 0.000 claims abstract description 34
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000001133 acceleration Effects 0.000 claims description 25
- 238000004458 analytical method Methods 0.000 claims description 23
- 238000010219 correlation analysis Methods 0.000 claims description 18
- 230000007958 sleep Effects 0.000 claims description 15
- 238000007405 data analysis Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 10
- 238000004088 simulation Methods 0.000 claims description 10
- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 230000003750 conditioning effect Effects 0.000 claims 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device
- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a long-span space structure health supervision system and a method thereof, wherein the system comprises a control center, a transmitting/receiving device and a monitoring node; the method comprises the following steps: acquiring a configuration signal to configure a working mode; when the configuration signal is configured into a passive monitoring mode, power is continuously supplied to the sensor through the excitation signal, and data acquired by the sensor are uploaded to a control center or stored in a transmitting/receiving device in real time; when the configuration signal is configured into a passive detection mode, the sensor is powered through the excitation signal at regular time, and data acquired by the sensor are uploaded to a control center or stored in a transmitting/receiving device in real time during the period of being powered; and processing and analyzing the acquired data to obtain the health evaluation of the large-span spatial structure. The sensor does not need to supply power by itself, and the power is supplied by the radio frequency signal of the transmitting end, so that the sensor is easier to package, and the reliability of the sensing node is greatly improved.
Description
Technical Field
The invention relates to the technical field of building health, in particular to a long-span space structure health supervision system and a method thereof.
Background
In the long-term service process of buildings and infrastructure, accurate perception of service states of important components is a primary problem and a necessary step for realizing diagnosis and treatment of the buildings. Particularly, large span space structures such as large span bridges and large crane beams are easy to deform, the disturbance of vibration is large, the detection of the deformation of the large span space structures is very necessary, and the problem of building safety is related. The cost of long-term monitoring is high, the traditional monitoring technology is unstable, the battery is easy to run out, and the monitoring node is easy to fail. On the basis of the development of the traditional structure monitoring and identification technology becoming mature, a new problem is faced in how to carry out health supervision on a large-span space structure in real time, continuously and with high reliability.
Disclosure of Invention
In view of the above, the present invention provides a system and a method for health supervision of a large-span spatial structure, which aims to solve the problem of unstable health monitoring of a large-span spatial structure in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a long-span space structure health supervision system comprises a control center, a transmitting/receiving device and a monitoring node; wherein the monitoring node comprises at least one;
the control center is in wireless connection with the transmitting/receiving device and is used for sending a control command to the transmitting/receiving device, receiving data acquired by the monitoring node, and processing and analyzing the data to obtain the health evaluation of the large-span space structure;
the transmitting/receiving device is in wireless connection with the monitoring node through an RFID (radio frequency identification device), and is used for receiving the control command and the data acquired by the monitoring node, sending a configuration signal and an excitation signal to the monitoring node according to the control command, and sending the data acquired by the monitoring node to the control center;
each monitoring node comprises a configurable antenna module, a power supply control circuit, a sensor, a memory and a power supply module;
the configurable antenna module is in wireless connection with the transmitting/receiving device, and is used for receiving the configuration signal and the excitation signal sent by the transmitting/receiving device and sending the received signals to the power supply control circuit;
the power supply control circuit is connected with the configurable antenna module and is used for acquiring the configuration signal to configure a working mode, wherein the working mode comprises a passive monitoring mode and a passive detection mode; and is also used for acquiring the excitation signal to complete power supply;
in the passive monitoring mode, the transmitting/receiving device continuously transmits the excitation signal, continuously controls power supply to the sensor, and transmits data acquired by the sensor to the control center or stores the data to the transmitting/receiving device through the configurable antenna module in real time;
in the passive detection mode, the transmitting/receiving device sends the excitation signal at fixed time, the sensor is powered by fixed time control, and data acquired by the sensor are sent to the control center or stored in the transmitting/receiving device through the configurable antenna module in real time during the period of power supply;
the sensor at least comprises one sensor, and is respectively connected with the power supply control circuit and used for collecting structural health information data of the position;
the low-power consumption processor is connected with the power supply control circuit and used for controlling the sensor to collect data, and the collected data are sent to the memory for storage.
Preferably, each monitoring node further comprises a memory and a power module, and the working mode further comprises an offline monitoring mode;
the memory is connected with the low-power-consumption processor and is used for storing the data acquired by the sensor in the off-line monitoring mode;
the power supply module is respectively connected with the power supply control circuit, the sensor, the memory and the low-power-consumption processor and is used for supplying power to the power supply control circuit, the sensor, the memory and the low-power-consumption processor in the off-line monitoring mode;
in the off-line monitoring mode, the power module and the memory are activated after the configuration signal is acquired, and the sleep control signal is sent to the transmitting/receiving device after the configuration is successful, and the transmitting/receiving device acquires the sleep control signal to enter a sleep state.
Preferably, the control center comprises a data analysis module;
the data analysis module comprises a data acquisition unit, a natural frequency deviation value calculation unit, a strain deviation value calculation unit, a historical data analysis unit and a correlation analysis unit;
the data acquisition unit is used for acquiring the data acquired by the sensor, and the data returned by each point position isWherein (1)>For acceleration signal +.>Is a strain signal;
the natural frequency deviation value calculating unit is used for calculating the acceleration signalPerforming time-frequency conversion to obtain the front third-order measured natural frequency of the current point location acceleration signal>From the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value of +.>
The strain offset value calculating unit is used for calculating the strain offset value according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value +.>
The historical data analysis unit is used for analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
the correlation analysis unit is used for analyzing the damaged nodeAnd carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
Preferably, the control center comprises a node layout determining module;
the node layout determining module comprises a structure vibration mode simulation unit, a finite element analysis unit and a node position determining unit;
the structure vibration mode simulation unit is used for performing structure vibration mode simulation on the large-span space structure;
the finite element analysis unit is used for carrying out finite element analysis on the large-span space structure, avoiding the intersection point position of the front third-order vibration mode and the original state to pre-determine the layout point position of the monitoring node, and obtaining the front third-order original natural frequency [ f ] of the nth point position through finite element calculation n,1 ，f n,2 ，f n,3 ]。
Preferably, the control center further comprises an acquisition interval setting module;
the acquisition interval setting module is used for acquiring an analysis result of the correlation analysis unit and adjusting the interval of acquisition data of the sensor according to the maintenance requirement of the large-span space structure.
Preferably, the monitoring node further comprises a passive sensing chip and a signal regulating circuit;
the passive sensing chip is respectively connected with the configurable antenna module and the power supply control circuit and is used for receiving and transmitting signals by utilizing an RFID communication protocol, acquiring the configuration signals and the excitation signals, identifying the configuration signals to obtain corresponding working mode configuration commands, transmitting the corresponding working mode configuration commands to the power supply control circuit, demodulating the excitation signals and transmitting the working mode configuration commands and the demodulated excitation signals to the power supply control circuit;
the signal regulating circuits at least comprise one, each signal regulating circuit is connected with one sensor, and each signal regulating circuit is also connected with the low-power-consumption processor and used for controlling the sensors to collect data, and the data collected by the sensors are modulated and then sent to the low-power-consumption processor.
Preferably, the types of the configurable antenna modules include: embedding a shielding type low-frequency high-power antenna, a civil environment low-frequency low-power antenna and an industrial environment high-frequency low-power antenna; the types of the sensor include: strain sensor, speed sensor, acceleration sensor and temperature and humidity sensor.
A method for supervising the health of a large-span space structure comprises the following steps:
s1, a transmitting/receiving device receives a control command and transmits a configuration signal and an excitation signal to each monitoring node according to the control command;
s2, acquiring the configuration signal to configure a working mode;
when the configuration signal is configured into a passive monitoring mode, continuously supplying power to the sensor through the excitation signal, and uploading data acquired by the sensor to a control center or storing the data in a transmitting/receiving device in real time;
when the configuration signal is configured into a passive detection mode, the sensor is powered through the excitation signal at regular time, and data acquired by the sensor are uploaded to a control center or stored in a transmitting/receiving device in real time during the power supply;
s3, processing and analyzing the data acquired by the sensor to obtain the health evaluation of the large-span space structure.
Preferably, in S2, when the configuration signal is configured in the off-line monitoring mode, the power module and the memory are activated, the power module supplies power to the sensor, and sends the sleep control signal to the transmitting/receiving device after the configuration is successful, so as to control the transmitting/receiving device to sleep; and storing the acquired data of the sensor into the memory.
Preferably, the specific content of S3 includes:
s31, acquiring data acquired by the sensor, wherein the data returned by each point position is thatWherein (1)>For acceleration signal +.>Is a strain signal;
s32, for acceleration signalsPerforming time-frequency conversion to obtain the front third-order measured natural frequency of the current point location acceleration signal>From the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value of (2)
S33, according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value +.>
S34, analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
s35, zeta of the damaged node m n And carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
Compared with the prior art, the invention discloses a long-span space structure health supervision system and a method thereof, wherein the invention adopts a passive RFID technology, a sensor is arranged on a monitoring point, a receiving end is arranged to be movable when in a passive detection mode, and is generally arranged on different carriers such as automobiles, so that the mobility of the receiving end is realized, when regular detection is needed, the moving transmitting end moves and then supplies power to the sensor and the like, so as to acquire data acquired by the sensor, and when in the passive detection mode, a transmitting/receiving device continuously supplies power to the sensor and the like, so that the sensor continuously acquires the data, and then the damage analysis is carried out on the data through a control center.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a health supervision system with a large-span space structure provided by the invention;
fig. 2 is a schematic diagram of vibration mode simulation provided in an embodiment of the present invention;
FIG. 3 is a natural frequency waveform diagram according to an embodiment of the present invention;
fig. 4 is a schematic diagram of monitoring node distribution according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a correlation analysis result provided in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a long-span space structure health supervision system, which is shown in figure 1 and comprises a control center, a transmitting/receiving device and a monitoring node; wherein the monitoring node comprises at least one;
the control center is in wireless connection with the transmitting/receiving device and is used for transmitting a control command to the transmitting/receiving device, receiving data acquired by the monitoring node, and processing and analyzing the data to obtain the health evaluation of the large-span space structure;
the transmitting/receiving device is in wireless connection with the monitoring node through the RFID and is used for receiving the control command and the data acquired by the monitoring node, sending a configuration signal and an excitation signal to the monitoring node according to the control command and sending the data acquired by the monitoring node to the control center;
each monitoring node comprises a configurable antenna module, a power supply control circuit, a sensor, a memory and a power supply module;
the configurable antenna module is in wireless connection with the transmitting/receiving device and is used for receiving the configuration signal and the excitation signal sent by the transmitting/receiving device and sending the received signals to the power supply control circuit;
the power supply control circuit is connected with the configurable antenna module and is used for acquiring a configuration signal to configure a working mode, wherein the working mode comprises a passive monitoring mode and a passive detection mode; the power supply device is also used for acquiring an excitation signal to finish power supply;
in the passive monitoring mode, the transmitting/receiving device continuously transmits an excitation signal, continuously controls power supply to the sensor, and transmits data acquired by the sensor to the control center or stores the data in the transmitting/receiving device through the configurable antenna module in real time;
in the passive detection mode, the transmitting/receiving device sends an excitation signal at fixed time, the sensor is powered by fixed time control, and data acquired by the sensor are sent to a control center or stored in the transmitting/receiving device through the configurable antenna module in real time during the period of being powered;
the sensor at least comprises one sensor, and is respectively connected with the power supply control circuit and used for collecting structural health information data of the position;
the low-power consumption processor is connected with the power supply control circuit and used for controlling the sensor to collect data, and the collected data are sent to the memory for storage.
In order to further implement the technical scheme, each monitoring node further comprises a memory and a power module, and the working mode further comprises an off-line monitoring mode;
the memory is connected with the low-power-consumption processor and is used for storing data acquired by the sensor in an off-line monitoring mode;
the power module is respectively connected with the power control circuit, the sensor, the memory and the low-power-consumption processor and is used for supplying power to the power control circuit, the sensor, the memory and the low-power-consumption processor in an off-line monitoring mode;
in the off-line monitoring mode, the power supply module and the memory are activated after the configuration signal is acquired, and the sleep control signal is sent to the transmitting/receiving device after the configuration is successful, and the transmitting/receiving device acquires the sleep control signal to enter the sleep state.
It should be noted that:
the working modes comprise a passive monitoring mode, a passive detection mode and an off-line monitoring mode;
when the deformation data which slowly change in the large-span space structure is required to be acquired, a passive detection module is adopted, and the sensor detection data in a certain time interval are acquired by setting the transmitting/receiving device as a movable device and moving in the large-span space structure at regular time;
when corresponding data which has damage or deformation exceeding a design value in a large-span space structure is required to be acquired, a passive monitoring mode is adopted, at the moment, a transmitting/receiving device can be set as a fixed device, power is continuously supplied to a sensor and the like in the space structure, and the sensor continuously acquires data in real time;
when acceleration signal data such as vibration signals and the like are required to be acquired, an off-line monitoring mode is adopted, a power supply and a memory are connected into a monitoring unit, the transmitting/receiving device enters dormancy, power is supplied through the connected power supply, the acquired data are stored off-line through the memory, the transmitting/receiving device is started manually or in other modes, and the data stored in the memory are uniformly uploaded to the transmitting/receiving device or a control center.
In order to further implement the above technical scheme, the control center comprises a data analysis module;
the data analysis module comprises a data acquisition unit, a natural frequency deviation value calculation unit, a strain deviation value calculation unit, a historical data analysis unit and a correlation analysis unit;
the data acquisition unit is used for acquiring the data acquired by the sensor, and the data returned by each point position isWherein (1)>For acceleration signal +.>Is strainA signal;
a natural frequency deviation value calculating unit for calculating the acceleration signal s m n Performing time-frequency conversion to obtain the front third-order actual measurement natural frequency of the current point location acceleration signalFrom the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value of +.>
Wherein the method comprises the steps ofm≥1。
A strain offset value calculation unit for calculating strain offset value according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value epsilon of (2) m n ；
The historical data analysis unit is used for analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
a correlation analysis unit for the damaged nodeAnd carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
In this embodiment, the specific analysis content of the history data analysis unit includes:absolute value of +.>In the adjacent 5 detection times->All are larger than 50 micro-strain (according to the project standard and the recommended value of the project data, see the concrete structural design Specification, can be adjusted), judging +.>Whether the change value of (c) is always greater than 0. The deformation may cause damage, which affects the natural frequency, increasing the natural frequency, in which case damage occurs to the structure at that point, suggesting maintenance or reinforcement.
Concrete structural design Specification: in general, the ultimate compressive strain ε of concrete u =0.0033 (3300 microstrain), ultimate tensile strain ε t =0.0001 (100 microstrain), peak stress corresponds to compressive strain ε 0 =0.0020 (2000 microstrain).
The specific analysis content of the correlation analysis unit includes: first third order natural frequency variation value of all points of primary detection of occurrence of damageAnd carrying out correlation analysis, analyzing nodes with larger variation correlation, and carrying out overall analysis on the damage of the nodes.
In order to further implement the technical scheme, the control center comprises a node layout determining module;
the node layout determining module comprises a structure vibration mode simulation unit, a finite element analysis unit and a node position determining unit;
the structure vibration mode simulation unit is used for performing structure vibration mode simulation on the large-span space structure;
the finite element analysis unit is used for carrying out finite element analysis on the large-span space structure, as shown in fig. 2, avoiding the intersection point position of the front third-order vibration mode and the original state to pre-determine the layout point position of the monitoring node, wherein the intersection point position of the front third-order vibration mode and the original state is shown in fig. 3, and obtaining the front third-order original natural frequency [ f ] of the nth point position through finite element calculation n,1 ，f n,2 ，f n,3 ]。
In the embodiment, the structure to be tested is provided with 'monitoring nodes', and the number of the nodes is not less than 10 in the structure with the span of more than 100 meters; a structure with a span of 100 meters or less, wherein the number of nodes is not less than 5; if the structure is obviously deformed or additionally loaded, a 'monitoring node' can be added at the corresponding point. As shown in FIG. 4, the unified node simultaneously collects acceleration signals s of the point location n And a strain signal delta n And selecting a passive monitoring mode during normal monitoring, and adding a power module and a storage module to select an off-line monitoring mode at the point where the abnormality occurs.
In order to further implement the technical scheme, the control center further comprises an acquisition interval setting module;
the acquisition interval setting module is used for acquiring an analysis result of the correlation analysis unit and adjusting the interval of acquisition data of the sensor according to the maintenance requirement of the large-span space structure.
In this embodiment, the transmitting/receiving device may be mounted on a vehicle such as a motor vehicle/wall climbing robot/cable robot/unmanned aerial vehicle and powered by a power supply on the vehicle, activate a node when each "monitoring node" is routed, and collect acceleration signals and strain signals of the node. The acquisition frequency, that is, the interval time of the carrier acquired once along all the acquisition nodes is adjusted according to the maintenance requirement of the large-span space structure, and the embodiment suggests that the acquisition frequency of the structure without obvious damage is not lower than 2 weeks/time for daily inspection; the structure acquisition frequency of potential hidden danger and obvious component deformation is found to be not lower than 24 hours/time, and the structure acquisition frequency is used for key observation; the acquisition frequency of the structure which is about to fail or has failed is not lower than 0.5 hour/time, and the structure is used for quasi-real-time monitoring. The carrier returns acceleration signals and strain signals through each node and through an RFID communication protocol, and the acquired data is uploaded to a control center or stored in a transmitting/receiving device.
As shown in fig. 5, 12 monitoring nodes are provided in this embodiment, and through the analysis in step (4), the correlations of the 4 th, 5 th, 6 th and 7 th nodes exceed 0.8, and the point positions are adjacent, it is considered that a structure in the middle of the monitoring node is damaged greatly, and it is recommended to perform key real-time monitoring and maintenance or reinforcement.
In order to further implement the technical scheme, the monitoring node further comprises a passive sensing chip and a signal regulating circuit;
the passive sensing chip is respectively connected with the configurable antenna module and the power supply control circuit and is used for receiving and transmitting signals by utilizing an RFID communication protocol, acquiring configuration signals and excitation signals, identifying the configuration signals to obtain corresponding working mode configuration commands, transmitting the corresponding working mode configuration commands to the power supply control circuit, demodulating the excitation signals, and transmitting the working mode configuration commands and the demodulated excitation signals to the power supply control circuit;
the signal regulating circuits at least comprise one, each signal regulating circuit is connected with one sensor, and each signal regulating circuit is also connected with the low-power-consumption processor and used for controlling the sensors to collect data, and the data collected by the sensors are modulated and then sent to the low-power-consumption processor.
In order to further implement the above technical solution, the types of configurable antenna modules include: embedding a shielding type low-frequency high-power antenna, a civil environment low-frequency low-power antenna and an industrial environment high-frequency low-power antenna; types of sensors include: strain sensor, speed sensor, acceleration sensor and temperature and humidity sensor.
A method for supervising the health of a large-span space structure comprises the following steps:
s1, a transmitting/receiving device receives a control command and sends a configuration signal and an excitation signal to each monitoring node according to the control command;
s2, acquiring a configuration signal to configure a working mode;
when the configuration signal is configured into a passive monitoring mode, power is continuously supplied to the sensor through the excitation signal, and data acquired by the sensor are uploaded to a control center or stored in a transmitting/receiving device in real time;
when the configuration signal is configured into an offline monitoring mode, the power module and the memory are activated, the power module supplies power to the sensor, and after the configuration is successful, the power module sends a dormancy control signal to the transmitting/receiving device to control the dormancy of the transmitting/receiving device; storing the data acquired by the sensor into a memory;
s3, processing and analyzing the data acquired by the sensor to obtain the health evaluation of the large-span space structure.
In order to further implement the above technical solution, in S2, when the configuration signal is configured to be in an offline monitoring mode, the power module and the memory are activated, the power module supplies power to the sensor, and after the configuration is successful, the sleep control signal is sent to the transmitting/receiving device to control the transmitting/receiving device to sleep; and storing the data acquired by the sensor into a memory.
In order to further implement the above technical solution, the specific content of S3 includes:
s31, acquiring data acquired by a sensor, wherein the data returned by each point position isWherein (1)>For acceleration signal +.>Is a strain signal;
s32, for acceleration signal s m n Performing time-frequency conversion to obtain the front third-order actual measurement natural frequency of the current point location acceleration signalFrom the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value of (2)
S33, according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value +.>
S34, analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
s35, zeta of damaged nodes n m And carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The system is characterized by comprising a control center, a transmitting/receiving device and a monitoring node; wherein the monitoring node comprises at least one;
the control center is in wireless connection with the transmitting/receiving device and is used for sending a control command to the transmitting/receiving device, receiving data acquired by the monitoring node, and processing and analyzing the data to obtain the health evaluation of the large-span space structure;
the transmitting/receiving device is in wireless connection with the monitoring node through an RFID (radio frequency identification device), and is used for receiving the control command and the data acquired by the monitoring node, sending a configuration signal and an excitation signal to the monitoring node according to the control command, and sending the data acquired by the monitoring node to the control center;
each monitoring node comprises a configurable antenna module, a power supply control circuit, a sensor and a low-power-consumption microprocessor;
the configurable antenna module is in wireless connection with the transmitting/receiving device, and is used for receiving the configuration signal and the excitation signal sent by the transmitting/receiving device and sending the received signals to the power supply control circuit;
the power supply control circuit is connected with the configurable antenna module and is used for acquiring the configuration signal to configure a working mode, wherein the working mode comprises a passive monitoring mode and a passive detection mode; and is also used for acquiring the excitation signal to complete power supply;
in the passive monitoring mode, the transmitting/receiving device continuously transmits the excitation signal, continuously controls power supply to the sensor, and transmits data acquired by the sensor to the control center or stores the data to the transmitting/receiving device through the configurable antenna module in real time;
in the passive detection mode, the transmitting/receiving device sends the excitation signal at fixed time, the sensor is powered by fixed time control, and data acquired by the sensor are sent to the control center or stored in the transmitting/receiving device through the configurable antenna module in real time during the period of power supply;
the sensor at least comprises one sensor, and is respectively connected with the power supply control circuit and used for collecting structural health information data of the position;
the low-power consumption microprocessor is connected with the power supply control circuit and is used for controlling the sensor to acquire data, acquiring the acquired data and then sending the acquired data to the memory for storage;
the control center comprises a data analysis module;
the data analysis module comprises a data acquisition unit, a natural frequency deviation value calculation unit, a strain deviation value calculation unit, a historical data analysis unit and a correlation analysis unit;
the data acquisition unit is used for acquiring the data acquired by the sensor, and the data returned by each point position isWherein (1)>For acceleration signal +.>Is a strain signal;
the natural frequency deviation value calculating unit is used for calculating the acceleration signalPerforming time-frequency conversion to obtain the front third-order measured natural frequency of the current point location acceleration signal>From the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value of +.>
The strain offset value calculating unit is used for calculating the strain offset value according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value of (2)
The historical data analysis unit is used for analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
the correlation analysis unit is used for analyzing the damaged nodeAnd carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
2. The long-span spatial structure health supervision system according to claim 1, wherein each of the monitoring nodes further comprises a memory and a power module, and the operation mode further comprises an offline monitoring mode;
the memory is connected with the low-power-consumption microprocessor and is used for storing the data acquired by the sensor in the off-line monitoring mode;
the power supply module is respectively connected with the power supply control circuit, the sensor, the memory and the low-power-consumption microprocessor and is used for supplying power to the power supply control circuit, the sensor, the memory and the low-power-consumption microprocessor in the off-line monitoring mode;
in the off-line monitoring mode, the power module and the memory are activated after the configuration signal is acquired, and after the configuration is successful, the sleep control signal is sent to the transmitting/receiving device, and the transmitting/receiving device acquires the sleep control signal and enters a sleep state.
3. The long-span spatial structure health supervision system according to claim 1, wherein the control center comprises a node arrangement determination module;
the node layout determining module comprises a structure vibration mode simulation unit, a finite element analysis unit and a node position determining unit;
the structure vibration mode simulation unit is used for performing structure vibration mode simulation on the large-span space structure;
the finite element analysis unit is used for carrying out finite element analysis on the large-span space structure, avoiding the intersection point position of the front third-order vibration mode and the original state to pre-determine the layout point position of the monitoring node, and obtaining the front third-order original natural frequency [ f ] of the nth point position through finite element calculation n,1 ，f n,2 ，f n,3 ]。
4. The long-span spatial structure health supervision system according to claim 1, wherein the control center further comprises an acquisition interval setting module;
the acquisition interval setting module is used for acquiring an analysis result of the correlation analysis unit and adjusting the interval of acquisition data of the sensor according to the maintenance requirement of the large-span space structure.
5. The long-span spatial structure health supervision system according to claim 1, wherein the monitoring node further comprises a passive sensing chip and a signal conditioning circuit;
the passive sensing chip is respectively connected with the configurable antenna module and the power supply control circuit and is used for receiving and transmitting signals by utilizing an RFID communication protocol, acquiring the configuration signals and the excitation signals, identifying the configuration signals to obtain corresponding working mode configuration commands, transmitting the corresponding working mode configuration commands to the power supply control circuit, demodulating the excitation signals and transmitting the working mode configuration commands and the demodulated excitation signals to the power supply control circuit;
the signal regulating circuits at least comprise one, each signal regulating circuit is connected with one sensor, and each signal regulating circuit is also connected with the low-power-consumption microprocessor and used for controlling the sensors to collect data, and the data collected by the sensors are modulated and then sent to the low-power-consumption microprocessor.
6. The long span spatial structured health supervision system according to claim 1, wherein the types of the configurable antenna modules comprise: embedding a shielding type low-frequency high-power antenna, a civil environment low-frequency low-power antenna and an industrial environment high-frequency low-power antenna; the types of the sensor include: strain sensor, speed sensor, acceleration sensor and temperature and humidity sensor.
7. The method for supervising the health of the large-span space structure is characterized by comprising the following steps of:
s1, a transmitting/receiving device receives a control command and transmits a configuration signal and an excitation signal to each monitoring node according to the control command;
s2, acquiring the configuration signal to configure a working mode;
when the configuration signal is configured into a passive monitoring mode, continuously supplying power to the sensor through the excitation signal, and uploading data acquired by the sensor to a control center or storing the data in a transmitting/receiving device in real time;
when the configuration signal is configured into a passive detection mode, the sensor is powered through the excitation signal at regular time, and data acquired by the sensor are uploaded to a control center or stored in a transmitting/receiving device in real time during the power supply;
s3, processing and analyzing the data acquired by the sensor to obtain the health evaluation of the large-span space structure; the specific content of S3 comprises:
s31, acquiring data acquired by the sensor, wherein the data returned by each point position is thatWherein (1)>For acceleration signal +.>Is a strain signal;
s32, for acceleration signalsPerforming time-frequency conversion to obtain the front third-order actual measurement natural frequency of the current point location acceleration signalFrom the 1 st detection, calculate the natural frequency [ f ] of the first third order n,1 ，f n,2 ，f n,3 ]Deviation value xi of (2) m n ；
S33, according to the strain signalCalculating a strain offset value to initiate a strain signal +.>As a reference point, from the 1 st detection, the strain value ε in each detection is calculated m And the initial strain signal->Offset value +.>
S34, analyzing the historical strain offset value of the single point position of the nth monitoring node to obtain a damaged node;
s35, for the damaged nodeAnd carrying out correlation analysis, and carrying out overall damage analysis on nodes with the change correlation larger than a preset threshold value.
8. The method according to claim 7, wherein in S2, when the configuration signal is configured in an off-line monitoring mode, a power module and a memory are activated, the power module supplies power to the sensor, and after the configuration is successful, a sleep control signal is sent to the transmitting/receiving device to control the transmitting/receiving device to sleep; and storing the acquired data of the sensor into the memory.
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