CN113624374B - Bridge inhaul cable group cable force synchronous monitoring system and method based on microwave full-field sensing - Google Patents
Bridge inhaul cable group cable force synchronous monitoring system and method based on microwave full-field sensing Download PDFInfo
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- CN113624374B CN113624374B CN202110905734.4A CN202110905734A CN113624374B CN 113624374 B CN113624374 B CN 113624374B CN 202110905734 A CN202110905734 A CN 202110905734A CN 113624374 B CN113624374 B CN 113624374B
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- 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
- G01L1/25—Measuring force or stress, in general using wave or particle radiation, e.g. X-rays, microwaves, neutrons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
Abstract
A bridge inhaul cable group cable force synchronous monitoring system and method based on microwave full-field sensing are disclosed, wherein the beam direction of the front end of a microwave radar is aligned to a bridge inhaul cable to be detected, a transmitting antenna is controlled to repeatedly transmit linear frequency modulation continuous wave microwave radar signals, a plurality of receiving antennas receive reflection signals of a plurality of inhaul cables to be detected, and multichannel intermediate frequency baseband signals are obtained through frequency mixing; and then realizing multi-point positioning and vibration response synchronous measurement of a plurality of guys according to the multi-channel intermediate frequency baseband signals based on the distance-angle joint dimension, and realizing on-line synchronous monitoring and early warning of guy groups. The invention locates and distinguishes the multi-measuring points on the plurality of guys of the bridge through the distance-angle joint dimension, synchronously extracts the multi-measuring point vibration response information of the guy group and synchronously, accurately and quickly measures the guy force of the guy group on line.
Description
Technical Field
The invention relates to a technology in the field of civil engineering testing, in particular to a system and a method for synchronously monitoring group cable force of a bridge inhaul cable based on microwave whole-field sensing.
Background
The existing robot-assisted bridge cable force detection technology detects the surface and the inside of a cable through climbing the cable along the cable, but the industrial robot is heavy, the intelligent degree is not high, the equipment cost is high, and the measurement is time-consuming. In addition, based on the mathematical relationship between the cable force and the natural frequency of the stay cable, the method for monitoring the cable force of the bridge stay cable represented by an acceleration sensor and based on optical fiber sensing can realize on-line monitoring through a vibration frequency measurement method, but only can realize single-point testing of a certain position of a certain stay cable, and when a plurality of stay cables or a certain stay cable are subjected to multi-point testing, a plurality of acceleration sensors or optical fiber grating vibration sensor groups are required to be arranged to realize distributed measurement of the cable force of the stay cable.
The non-contact measurement mainly comprises a video-based stay cable vibration monitoring method, but the method is easily influenced by environmental factors such as light and the like, the measurement precision is low, and the frequency response bandwidth is limited; the existing cable force monitoring method based on the microwave radar is limited by transmission bandwidth, the distance resolution is low, the problems of static clutter interference, adjacent multi-component coupling and same-distance unit component aliasing interference are prominent, and high-precision deformation and vibration measurement cannot be realized. Particularly, in the actual stay cable force test of engineering, because the stay cable is long, a plurality of stay cables are often positioned in the same or adjacent distance units and are difficult to distinguish, and multi-stay-cable vibration coupling of adjacent distance units and multi-stay-cable vibration aliasing interference of the same distance units are easily generated in the radar beam radiation range, so that the vibration measurement precision of the stay cable is obviously reduced, and even the stay cable fails.
Disclosure of Invention
The invention provides a bridge inhaul cable group cable force synchronous monitoring system and method based on microwave full-field sensing, aiming at the defects and difficulties in the prior art, the multi-measuring points on a plurality of inhaul cables of a bridge are positioned and distinguished through a distance-angle combined dimension, the multi-measuring point vibration response information of an inhaul cable group is synchronously extracted, the cable force of the inhaul cable group is accurately measured, and the bridge inhaul cable force synchronous monitoring system and method have wide application prospect and engineering application value in bridge inhaul cable force monitoring.
The invention is realized by the following technical scheme:
the invention relates to a bridge inhaul cable group cable force synchronous monitoring system based on microwave full-field sensing, which comprises: a microwave radar front end, a processor module and a display and storage module for transmitting and receiving chirp continuous wave microwave signals, wherein: the processor module comprises: the system comprises a signal acquisition submodule for synchronously acquiring multi-channel baseband signals output by the front end of a microwave radar, a signal processing submodule for processing the multi-channel baseband signals and synchronously extracting vibration displacement time sequences of a plurality of guy cables of a guy cable group, and a characteristic analysis submodule for performing characteristic analysis on the vibration displacement time sequence signals of the plurality of guy cables, calculating cable force of the plurality of guy cables and evaluating abnormal cable force and damage risks of the guy cables, and a display and storage module for displaying information comprising a distribution heat map of all-field measuring points of the plurality of guy cables, a vibration response measuring result of the plurality of guy cables and the cable force of the plurality of guy cables and storing a measuring result and an early warning analysis result of the guy cable group multi-guy cable force.
The microwave radar front end comprises: at least one transmitting antenna, a plurality of receiving antennas and a source of chirped continuous wave microwave signals, a power divider, a power amplifier, a low noise amplifier, a mixer and a low pass filter assembly, wherein: the receiving antennas are distributed in an equally spaced linear array.
The invention relates to a bridge inhaul cable group cable force synchronous monitoring method based on microwave full-field sensing, which aims the wave beam direction of the front end of a microwave radar at a bridge inhaul cable to be detected, controls a transmitting antenna to repeatedly transmit linear frequency modulation continuous wave microwave radar signals, receives the reflected signals of a plurality of inhaul cables to be detected by a plurality of receiving antennas, and obtains a multi-channel intermediate frequency baseband signal through frequency mixing; and then realizing multi-point positioning and effective point selection of a plurality of guys according to the multi-channel intermediate frequency baseband signal based on the distance-angle joint dimension, and extracting the vibration response of each measuring point to realize on-line synchronous monitoring and early warning of the guy group cable force.
The distance-angle image information of the inhaul cable comprises: accurate positioning information of distance dimension and angle dimension.
The distance-angle image information of the inhaul cable is obtained through the following method: taking a multichannel intermediate frequency baseband signal H received in a certain sweep frequency period, arranging the multichannel intermediate frequency baseband signals according to columns to form a matrix signal H, and performing fast Fourier transform on the signal H according to the columns to obtain range profile information H of the inhaul cable group f Then to H f Performing fast Fourier transform according to rows to obtain a distance-angle image matrix H of the inhaul cable group ff 。
The positioning refers to: for matrix H ff Obtaining a distance-angle combined dimension heat map of the reflected energy of the guy rope group by taking the complex amplitude, realizing the positioning and identification of the full-field measuring points of the guy rope group according to the peak value search and the actual spatial distribution of the guy rope group, selecting the effective measuring points of the guy rope to be measured according to the signal intensity and the clutter interference intensity, and obtaining a matrix H corresponding to each measuring point ff The index position of (2).
The vibration response information of each inhaul cable is extracted in the following mode:
step 1, extracting an interference phase evolution time sequence of each measuring point, which specifically comprises the following steps:
step 2, calculating the vibration displacement time sequence of each inhaul cable, specifically:
wherein x (q, iT) is the displacement time sequence estimated value of the ith emission period of the qth guy cable measuring point, lambda c Is the wavelength corresponding to the center frequency of the carrier wave of the linear frequency modulation continuous wave,
is composed of
Average value of (a).
The online synchronous monitoring and early warning of the inhaul cable group specifically comprises:
step i) calculating the cable force F of each cable q And (Q is 1, 2 and … Q), wherein Q is the total number of the cables to be tested. Extracting the first-order natural frequency f of vibration from the displacement time sequence x (q, iT) of each stay cable measuring point by performing spectrum analysis q And the mathematical relationship between the cable force of the stay cable and the first-order natural frequency of the stay cable is obtainedTo cable force
Wherein: rho is the linear density of the cable, L q The length of the q-th inhaul cable is defined;
step ii) judging whether the cable force measurement value of the inhaul cable exceeds a set safety threshold value, and if the cable force measurement value of the inhaul cable exceeds the set safety threshold value, giving an alarm and reminding; and analyzing the difference of the cable force of each cable in the cable group, combining the actual spatial distribution and the bearing characteristics, and judging that the cable has a damage risk when the difference of the cable force of the cable and the cable force of the adjacent cable exceeds a threshold value.
Technical effects
The invention integrally solves the problems that a plurality of guys are difficult to position and the measurement points are mixed in a guy cable force measurement technology based on the microwave radar, and the test reliability and the usability are poor; the problem of in the cable force measurement, be difficult to overcome many cable measurement station couplings and aliasing clutter interference, the cable force measurement accuracy that leads to is poor is solved.
Compared with the prior art, the method realizes the full-field positioning and identification of the plurality of guy cable multi-measuring points of the guy cable group through the distance-angle joint dimension, can effectively distinguish the measuring point positions of the guy cable group, and improves the reliability and the usability of the test; the interference problems of adjacent distance unit coupling and same distance unit aliasing of a plurality of stay cable measuring points are solved through full-field vibration measurement, accurate vibration information extraction of the plurality of stay cable measuring points of the stay cable group is realized, accurate synchronous online measurement of the cable force of the stay cable group is realized, all-weather online monitoring in all days is realized, and the test and the operation are simple and convenient and the cost is low.
Drawings
FIG. 1 is a schematic diagram of synchronous monitoring of bridge cable group cable force based on microwave full-field sensing according to the present invention;
FIG. 2 is a flow chart of the online synchronous monitoring method for the group cable force of the bridge inhaul cable based on microwave full-field sensing;
FIG. 3 is a schematic diagram of the instantaneous frequency of the transmitting signal and the receiving signal of the microwave radar according to the present invention;
FIG. 4 is a block diagram of a bridge inhaul cable group cable force synchronous monitoring system based on microwave full-field sensing;
FIG. 5 is a schematic diagram of a front end structure of a microwave radar according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1 and fig. 2, this embodiment relates to a bridge guy cable group cable force synchronous monitoring method based on microwave whole field sensing, which includes the following steps:
step 1, the front end of a microwave radar is aligned to a bridge cable to be detected, and a linear frequency modulation continuous wave microwave signal is repeatedly transmitted through a transmitting antenna. As shown in fig. 3, the schematic diagram shows that three transmitting antennas transmit time-shared, three receiving antennas receive microwave radar signals simultaneously, and the signal transmission period is T f The sweep period is T, the bandwidth is B, and the received signal is the time delay of the transmitted signal.
Step 2, a plurality of receiving antennas at the front end of the radar receive reflected signals of a plurality of stay cables to be tested, the received signals and local oscillator signals are subjected to frequency mixing operation to obtain multi-channel intermediate frequency baseband signals, the multi-channel intermediate frequency baseband signals are synchronously acquired by a signal acquisition submodule of the processor module, and the multi-channel intermediate frequency baseband signals received in a certain frequency sweeping period are recorded as H ═ S [, where 1 ，S 2 ，…S M ]Where M is the number of virtual channels of the received signal, where the baseband signal S of channel M m Is [ s (0, m), s (1, m), … s (N-1, m)] T And N is the number of baseband signal samples of each channel.
Step 3, processing the intermediate frequency baseband signal through a signal processing submodule of the processor module to acquire distance-angle image information of a plurality of inhaul cables, so that the plurality of inhaul cables can be accurately positioned and distinguished in a distance-angle joint dimension, and the method specifically comprises the following steps: performing two-dimensional fast Fourier transform on an intermediate frequency baseband signal matrix H with a certain scanning period, firstly performing fast Fourier transform on the matrix H according to columns to obtain distance image information of the inhaul cable, and recording the matrix H f Then to matrix H f Fast Fourier transform is carried out according to rows to obtain a distance-angle image matrix H of the inhaul cable group ff . For matrix H ff Obtaining a distance-angle joint dimension heat map of the reflected energy of the guy cable group by taking the complex amplitude, and realizing the purpose according to the peak value search and the actual spatial distribution of the guy cable groupAnd positioning and identifying the cable group full-field measuring points. In order to further improve the measurement precision and reliability, effective measuring points of the guy cable to be measured are selected according to the signal intensity and the clutter interference intensity, measuring points with stronger signal intensity and less adjacent clutter interference in guy cable multi-measuring points are preferably selected, and a matrix H corresponding to each measuring point is obtained ff The index position of (2).
Step 4, extracting vibration displacement time domain information of each inhaul cable, which specifically comprises the following steps:
step 4.1, extracting an interference phase evolution time sequence of each measuring point, wherein the extraction method comprises the following steps:
according to the interference phase modulation principle of cable vibration on multi-channel baseband signals and the phase difference of specific relations among multiple channels, namely d sin theta/lambda, d is the interval of multiple receiving antennas, lambda is the carrier wavelength, theta is the incident angle of a target or a measuring point, the interference phase evolution caused by the vibration of the whole field measuring point is obtained through derivation and analysis and can be shifted from the distance dimension to the angle dimension and is kept unchanged. Therefore, in order to inhibit the influence of coupling interference of adjacent components and aliasing interference of components in units at the same distance and obtain a high-precision vibration information extraction result, the evolution estimation of the interference phase of the full-field measuring point of the distance-angle joint dimension is adopted, and the estimation method comprises the following steps:
wherein:
the estimated value of the interference phase of the ith emission period of the qth stay cable measuring point, T is the repeated emission period of the linear frequency modulation signal, arg [ ·]For taking complex phase operations, s i (. h) is the ith transmit period multi-channel IF baseband signal matrix, N z Discrete points M of fast Fourier transform of the multi-channel intermediate frequency baseband signal H in the step 3 according to columns z For H in step 3 f Discrete number of points, k, for fast Fourier transform by line q And p q Respectively indexing the distance dimension and the angle dimension of the qth stay cable measuring point;
step 4.2, calculating vibration of each inhaul cableThe dynamic displacement time sequence specifically comprises the following steps:
wherein: x (q, iT) is the displacement time sequence estimated value of the ith emission period of the qth guy cable measuring point, lambda c Is the wavelength corresponding to the center frequency of the carrier wave of the linear frequency modulation continuous wave,
is composed of
Average value of (a).
And 5, carrying out on-line synchronous monitoring and early warning on the inhaul cable group through the characteristic analysis submodule.
Step 5.1, calculating the cable force F of each cable q (Q is 1, 2, … Q), wherein Q is the total number of the cables to be tested. Extracting the first-order natural frequency f of vibration from the displacement time sequence x (q, iT) of each stay cable measuring point by performing spectrum analysis q And obtaining the cable force according to the mathematical relation between the cable force of the stay cable and the first-order natural frequency of the stay cable
Wherein: rho is the linear density of the cable, L q The length of the qth inhaul cable is shown;
step 5.2, judging whether the cable force measurement value of the inhaul cable exceeds a set safety threshold value, and if the cable force measurement value of the inhaul cable exceeds the set safety threshold value, giving an alarm and reminding; and analyzing the difference of the cable force of each cable in the cable group, combining the actual spatial distribution and the bearing characteristics, and judging that the cable has a damage risk when the difference of the cable force of the cable and the cable force of the adjacent cable exceeds a threshold value. In the practical engineering, the cable force of the cable group can be monitored online for a long time, the time-frequency analysis is carried out on the vibration displacement time sequence x (q, iT) of the cable, and the change rule of the cable force of the cable along with the time is obtained by using a time-frequency peak ridge line extraction method, so that the performance and the damage risk of the cable are judged.
As shown in fig. 4, the present embodiment relates to a bridge cable group cable force synchronous monitoring system based on microwave full field sensing, including: microwave radar front end, processor module and demonstration and save the module, wherein: the microwave radar front-end module is connected with the processor module and transmits multi-channel baseband signals; the processor module is connected with the display and storage module and transmits information including distance-angle joint dimension positioning information of stay cable group measuring points, a cable force measuring result and a characteristic analysis result.
The processor module comprises: signal acquisition submodule, signal processing submodule and characteristic analysis submodule, wherein: in order to utilize the transmission phase difference information among multiple channels, the signal acquisition submodule synchronously acquires a multi-channel baseband signal output by the front end of the microwave radar; the signal processing submodule processes the multichannel baseband signals and synchronously extracts the vibration displacement time sequence of the guy cable group multi-guy cables; and the characteristic analysis submodule performs characteristic analysis on the vibration displacement time sequence signals of the multiple guys, calculates the cable force of the multiple guys, and evaluates the abnormal cable force and damage risks of the guys.
As shown in fig. 5, the microwave radar front end includes: the device comprises a linear frequency modulation continuous wave microwave signal source, a power divider, a power amplifier, a low noise amplifier, a mixer, a low pass filter, at least one transmitting antenna and a plurality of receiving antennas which are distributed in a linear equal-interval array. The number of the power divider and the power amplifier is the same as that of the transmitting antennas, and the number of the low noise amplifier is the same as that of the receiving antennas.
The distance between the receiving antennas is less than or equal to half of the carrier wavelength of the transmitted microwave signals. When the number of the transmitting antennas is multiple, the spatial layout is carried out according to the time-sharing transmitting multiplexing principle, equivalent virtual receiving channels which are multiplied are generated, and the number of the equivalent virtual receiving channels is equal to the product of the number of the transmitting antennas and the number of the receiving antennas.
The linear frequency modulation continuous wave microwave signal source is connected with the power divider to transmit a linear frequency modulation carrier signal, one end of the power divider is connected with the power amplifier, and the other end of the power divider is connected with the frequency mixer and transmits a local oscillation signal; the power amplifier is connected with the transmitting antenna and transmits amplified linear frequency modulation carrier signals, the receiving antenna is connected with the low noise amplifier, the low noise amplifier is connected with the frequency mixer and transmits amplified receiving signals, and the output end of the frequency mixer is connected with the low pass filter and generates intermediate frequency baseband signals.
The signal of the linear frequency modulation continuous wave microwave signal source is divided into two paths through the power divider, one path is connected with the transmitting antenna through the power amplifier and is transmitted by the transmitting antenna, and the other path and the amplified receiving signal generate a mixing signal through a mixer.
The receiving antenna receives microwave signals reflected by the inhaul cable and transmits the microwave signals to the frequency mixer through the low-noise amplifier; the mixer mixes the microwave signal transmitted by the low noise amplifier with the other path of microwave local oscillation signal after passing through the power divider, and outputs a multi-channel baseband signal after being processed by the low pass filter.
Compared with the prior art, the method realizes reliable positioning and distinguishing of the whole inhaul cable group, solves the problem of clutter interference suppression, and obtains accurate synchronous measurement of multi-inhaul cable vibration response and cable force test.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The utility model provides a bridge cable crowd cable power synchronous monitoring system based on full perception of microwave which characterized in that includes: a microwave radar front end, a processor module and a display and storage module for transmitting and receiving chirp continuous wave microwave signals, wherein: the microwave radar front end comprises at least one transmitting antenna and a plurality of receiving antennas and outputs multi-channel baseband signals; the processor module comprises a signal acquisition submodule, a signal processing submodule and a characteristic analysis submodule, wherein: the signal acquisition submodule is used for synchronously acquiring multi-channel baseband signals output by the front end of the microwave radar; the signal processing submodule is used for processing the baseband signals to obtain distance-angle image information of the plurality of inhaul cables, so that the plurality of inhaul cables can be accurately positioned and distinguished in a distance-angle combined dimension, and a vibration displacement time sequence of the plurality of inhaul cables of the inhaul cable group is synchronously extracted; the characteristic analysis submodule is used for carrying out characteristic analysis on the vibration displacement time sequence signals of the multi-stay cable, calculating the cable force of the multi-stay cable and evaluating the abnormal cable force and damage risks of the multi-stay cable; the display and storage module displays information including a multi-stay-cable full-field measuring point distribution heat map, a multi-stay-cable vibration response measuring result and multi-stay-cable force and is used for storing a measuring result and an early warning analysis result of the multi-stay-cable force of the stay cable group.
2. The bridge inhaul cable group cable force synchronous monitoring system according to claim 1, wherein the microwave radar front end further comprises a chirp continuous wave microwave signal source, a power divider, a power amplifier, a low noise amplifier, a mixer and a low pass filter component, wherein: the receiving antennas are distributed in an equally spaced linear array;
the distance between the receiving antennas is less than or equal to half of the carrier wavelength of the transmitted microwave signals; when a plurality of transmitting antennas are provided, the spatial layout is carried out according to the time-sharing transmitting multiplexing principle, and the multiplied equivalent virtual receiving channels are generated.
3. The bridge inhaul cable group cable force synchronous monitoring system according to claim 2, wherein the chirp continuous wave microwave signal source is connected with the power divider to transmit chirp carrier signals, one end of the power divider is connected with the power amplifier, and the other end of the power divider is connected with the mixer and transmits local oscillator signals; the power amplifier is connected with the transmitting antenna and transmits the amplified linear frequency modulation carrier signal, the receiving antenna is connected with the low-noise amplifier, the low-noise amplifier is connected with the frequency mixer and transmits the amplified receiving signal, and the output end of the frequency mixer is connected with the low-pass filter and generates an intermediate frequency baseband signal; the signal of the linear frequency modulation continuous wave microwave signal source is divided into two paths through a power divider, one path is connected with a transmitting antenna through a power amplifier and is transmitted by the transmitting antenna, and the other path and an amplified receiving signal generate a mixing signal through a mixer; the receiving antenna receives microwave signals reflected by the inhaul cable group and transmits the microwave signals to the frequency mixer through the low-noise amplifier; the mixer mixes the microwave signal transmitted by the low noise amplifier with the other path of microwave local oscillation signal after passing through the power divider, and outputs a multichannel baseband signal after being processed by the low pass filter.
4. A microwave full-field sensing bridge cable group cable force synchronous monitoring method based on the system of any claim is characterized in that the wave beam direction of the front end of a microwave radar is aligned to a bridge cable to be detected, a transmitting antenna is controlled to repeatedly transmit linear frequency modulation continuous wave microwave radar signals, a plurality of receiving antennas receive reflection signals of the plurality of cables to be detected, and multichannel intermediate frequency baseband signals are obtained through frequency mixing; and then realizing multi-point positioning and effective point selection of a plurality of guys according to the multi-channel intermediate frequency baseband signal based on the distance-angle joint dimension, and extracting the vibration response of each measuring point to realize on-line synchronous monitoring and early warning of the guy group cable force.
5. The microwave full-field sensing bridge dragline group cable force synchronous monitoring method according to claim 4, wherein the distance-angle image information of the draglines comprises: full field positioning information of a distance dimension and an angle dimension;
the distance-angle image information of the inhaul cable is obtained through the following method: taking a multichannel intermediate frequency baseband signal H received in a certain sweep frequency period, and obtaining a distance-angle image matrix H of the inhaul cable group through two-dimensional Fourier transform of a distance dimension and an angle dimension formed by multiple channels ff ；
The positioning refers to: for matrix H ff Obtaining a distance-angle combined dimension heat map of the reflected energy of the guy rope group by taking the complex amplitude, realizing the positioning and identification of the full-field measuring points of the guy rope group according to the peak value search and the actual spatial distribution of the guy rope group, selecting the effective measuring points of the guy rope to be measured according to the signal intensity and the clutter interference intensity, and obtaining a matrix H corresponding to each measuring point ff The index position of (2).
6. The microwave full-field sensing bridge dragline group cable force synchronous monitoring method as claimed in claim 4, wherein the vibration response information of each measuring point is extracted in the following way:
step 1, extracting an interference phase evolution time sequence of each measuring point, which specifically comprises the following steps:
step 2, calculating the vibration displacement time sequence of each inhaul cable, specifically:
wherein x (q, iT) is the displacement time sequence estimated value of the ith emission period of the qth guy cable measuring point, lambda c Is the wavelength corresponding to the center frequency of the carrier wave of the linear frequency modulation continuous wave,
is composed of
Average value of (a).
7. The microwave full-field-sensing bridge dragline group cable force synchronous monitoring method according to claim 4, wherein the on-line synchronous monitoring and early warning of the dragline group specifically comprises the following steps:
step i) calculating the cable force F of each cable q (Q ═ 1, 2, … Q), wherein Q is the total number of cables tested; extracting the first-order natural frequency f of the vibration from the displacement time sequence x (q, iT) of each guy cable measuring point by performing spectrum analysis q And obtaining the cable force according to the mathematical relation between the cable force of the stay cable and the first-order natural frequency of the stay cable
Wherein: rho is the linear density of the cable, L q The length of the qth inhaul cable is shown;
step ii) judging whether the cable force measurement value of the inhaul cable exceeds a set safety threshold value, and sending out an alarm and a prompt when the cable force measurement value exceeds the threshold value; and analyzing the difference of the cable force of each cable in the cable group, combining the actual spatial distribution and the bearing characteristics, and judging that the cable has a damage risk when the difference of the cable force of the cable and the cable force of the adjacent cable exceeds a threshold value.
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Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2778931B2 (en) * | 1995-06-30 | 1998-07-23 | 防衛庁技術研究本部長 | Radar / target wave simulator |
| JP5312503B2 (en) * | 2011-03-16 | 2013-10-09 | 三菱電機株式会社 | Radar equipment |
| CZ2013714A3 (en) * | 2013-09-18 | 2015-04-29 | České Vysoké Učení Technické V Praze, Fakulta Elektrotechnická | Microwave system with expanded ability to detect, identify and localize moving targets |
| CN108801660B (en) * | 2017-04-27 | 2020-06-19 | 南京理工大学 | Laboratory detection device and method for emergency braking performance of high-speed train |
| CN107271095A (en) * | 2017-07-24 | 2017-10-20 | 湖南镭氪信息科技有限公司 | A kind of Suo Li remote sensing survey methods based on microwave interference |
| US11079289B2 (en) * | 2017-08-18 | 2021-08-03 | Google Llc | Radar-based force sensing |
| US11086315B2 (en) * | 2017-10-26 | 2021-08-10 | 2KR Systems, LLC | Building rooftop intelligence gathering, decision-support and snow load removal system for protecting buildings from excessive snow load conditions, and automated methods for carrying out the same |
| CN109269704A (en) * | 2018-10-18 | 2019-01-25 | 中铁大桥局集团有限公司 | Cable force measurement system and method, the construction monitoring system and method for cable-stayed bridge |
| CN110031837B (en) * | 2019-03-20 | 2022-10-04 | 东南大学 | Bridge inhaul cable group cable force synchronous monitoring method and system based on microwave radar |
| CN110646771A (en) * | 2019-10-12 | 2020-01-03 | 镇江盛益系统科技有限公司 | Rapid multi-transmitting multi-receiving array correction system and method |
| CN111044197B (en) * | 2019-10-25 | 2021-06-11 | 东南大学 | Non-contact cable force test system based on unmanned aerial vehicle platform |
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2020
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