CN110332463A - Pipeline structure damage monitoring system based on wireless sensor network - Google Patents
Pipeline structure damage monitoring system based on wireless sensor network Download PDFInfo
- Publication number
- CN110332463A CN110332463A CN201910517499.6A CN201910517499A CN110332463A CN 110332463 A CN110332463 A CN 110332463A CN 201910517499 A CN201910517499 A CN 201910517499A CN 110332463 A CN110332463 A CN 110332463A
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- Prior art keywords
- damage
- signal
- sensor network
- wireless sensor
- module
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/043—Analysing solids in the interior, e.g. by shear waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/044—Internal reflections (echoes), e.g. on walls or defects
Abstract
The pipeline structure damage monitoring system based on wireless sensor network that the invention discloses a kind of.The system includes piezoelectric-array, several damage monitoring nodes, wireless sensor network base station and lesion assessment unit, the piezoelectric-array is arranged in pipeline external surface, pumping signal for issuing in response to damage monitoring node generates high frequency ultrasound guided wave signals, and the piezoelectric-array is used to receive simultaneously meets the reflected echo-signal of pipe damage；The damage monitoring node is for acquiring echo-signal and being sent to wireless sensor network base station after amplifying to it；The lesion assessment unit is used to carry out damage diagnosis according to the received echo-signal in wireless sensor network base station, and pipe damage position is positioned and is imaged.The damage information that the present invention uploads node diagnoses, and pipeline configuration health status can be timely feedbacked during current check, provides accurate damage information to service engineer, prevents the generation of safety accident.
Description
Technical field
The invention belongs to structure for health diagnosis technology, specially a kind of pipeline configuration damage based on wireless sensor network
Monitoring system.
Background technique
Pipeline configuration used in the engineering project more and more frequently, most of pipeline configuration with service life increasing
Add, unavoidably will receive the influence such as impact, gas-liquid burn into material aging, lead to the leakage of pipe inside configuration shipped material.
Therefore, pipeline architecture is broken to the severely afflicated area occurred for safety accident.Especially during oil gas, liquid transporting, pipe
Road be typically subjected to huge load and impact, easily occur it is paroxysmal crumble, bring serious security risk and be difficult to estimate
The property loss of amount.
Currently, most of utilities pipeline maintenance personnel is by tapping the abnormal sound or wired structural health prison that pipeline generates
Measurement equipment judges that the damage of tubular structure only passes through experience however, often very long and ambient enviroment is sufficiently complex for pipeline configuration
Judgement can have very big subjective factor so as to cause the inaccuracy of judgement.When there is abnormal sound, illustrate that pipeline has gone out
It now damages, pipeline, which remains in operation, has existed very big security risk, and artificial maintenance does not have real-time for pipeline monitoring；
On the other hand, in practical applications, cable architecture monitoring system generally requires to be laid with a large amount of cables, causes system maintenance and update
Costly, the problems such as mobility is poor, difficult wiring.This traditional detection mode causes greatly for maintenance personnel
It is inconvenient.Meanwhile pipeline is generally hollow structure, internal injury can not be judged by intuitive manner.
Summary of the invention
The pipeline structure damage monitoring system based on wireless sensor network that the purpose of the present invention is to provide a kind of, to
The problems such as wiring is troublesome, complicated for operation, real-time is poor when solving now to detect pipeline safety.
Realize the technical solution of the object of the invention are as follows: a kind of pipe damage monitoring system based on wireless sensor network,
It is set including piezoelectric-array, several damage monitoring nodes, wireless sensor network base station and lesion assessment unit, the piezoelectric-array
It sets the pumping signal in pipeline external surface, for issuing in response to damage monitoring node and generates high frequency ultrasound guided wave signals, it is described
Piezoelectric-array is used to receive simultaneously meets the reflected echo-signal of pipe damage；The damage monitoring node is for acquiring echo
Signal is simultaneously sent to wireless sensor network base station after amplifying to it；The lesion assessment unit is used for according to wireless sensing
The received echo-signal of device network base station carries out damage diagnosis, and pipe damage position is positioned and is imaged.
Preferably, the piezoelectric-array is piezoelectric patches group, and one group of piezoelectric patches group includes 2 at a distance of the same specification circle for 30cm
Shape piezoelectric patches, the piezoelectric patches group is along pipeline radial direction with 20cm apart from spaced set.
Preferably, the quantity of the piezoelectric patches group is 6 groups or more.
Preferably, the damage monitoring node includes fpga core processing module, pumping signal generation module, data high-speed
Module occurs for acquisition module, adjustable signal amplification module, wireless transport module and power supply module, the pumping signal for producing
Raw pumping signal, the data high-speed acquisition module are converted for acquiring the received reflection echo signal of piezoelectric-array
For digital signal；The adjustable signal amplification module is for amplifying pumping signal, digital signal, the wireless transmission mould
Block is used to distribute the IP address of damage monitoring node and sends amplified digital signal.
Preferably, the pumping signal that the damage monitoring node generates is that frequency thickness product is 0.52MHzmm, center frequency
Rate is 260kHz, the sinusoidal modulation signal that wave crest number is 5, specifically:
I (t)=[H (t)-H (t-N/fc)]×(1-cos(2πfct/N))sin 2πfct
F in formulacFor the centre frequency of pumping signal, H (t) is Heaviside function, and N is the wave crest of sin modulated signal
Number.
Preferably, wireless sensor network base station is CC2630 wireless module.
Preferably, the lesion assessment unit is made of computer monitoring terminal.
Compared with prior art, the present invention its remarkable advantage are as follows: (1) present invention is led to using wireless sensor network
Node can be placed in any position in monitoring region according to actual needs, expand pipeline structure damage monitoring range, solution by letter
The difficult problem of wired mode of having determined wiring；(2) present invention damages on the communication infrastructure of wireless sensor network in conjunction with supersonic guide-wave
The characteristic of wound monitoring realizes the timely monitoring of pipe damage.It is very quick to all kinds of damages when supersonic guide-wave is propagated in structure
Sense, encounters defect damage and has portion of ultrasonic sound wave and reflect, and damage node acquisition compares various reflected waves after uploading
Shape can effectively detect pipe damage；(3) present invention has very strong flexibility, substantially reduces monitoring cost and difficulty,
The defect for effectively compensating for manual maintenance Yu traditional structure health monitoring, can be widely applied for the damage monitoring of pipeline configuration.
Meanwhile monitoring system integrally also has many advantages, such as that small in size, low-power consumption, damage monitoring are real-time, communication distance is remote.
Detailed description of the invention
Fig. 1 is schematic diagram of the invention.
Fig. 2 is the piezoelectric-array excitation and response signal figure that damage monitoring node of the present invention generates.
Fig. 3 is network frame schematic diagram of the invention.
Fig. 4 is work flow diagram of the invention.
Specific embodiment
As shown in Figure 1, a kind of pipeline structure damage monitoring system based on wireless sensor network, comprising: piezoelectric-array,
Several damage monitoring nodes, wireless sensor network base station and lesion assessment unit.The damage monitoring node includes FPGA core
Heart processing module, pumping signal occur module, data high-speed acquisition module, adjustable signal amplification module, wireless transport module with
And power supply module, damage monitoring node by pumping signal occur module generate pumping signal act on piezoelectric-array, make its
Inner wall of the pipe generates high frequency ultrasound guided wave, and high frequency ultrasound guided wave encounters defect of pipeline, and a part of high frequency ultrasound guided wave will occur anti-
It is emitted back towards bullet, piezoelectric-array is used to receive simultaneously meets the reflected echo-signal of pipe damage, and the data of damage monitoring node are high
Fast acquisition module acquires echo-signal in real time, and is amplified by adjustable signal amplification module to it.Damage monitoring
Since node be uploaded to wireless sensor network base station for complete signal acquiring the moment, through wireless transport module, and base station turns
Data are sent out to the terminal in lesion assessment unit, carry out breakdown diagnosis and diagnosis.
Piezoelectric-array is made of multiple groups piezoelectric patches in the present invention, comprising 2 same specification circle pressures at a distance of 30cm in every group
Electric piece, piezoelectric patches group quantity are 6 groups or more, are equally spaced along pipeline radial direction with 20cm distance.Since positive and negative piezoelectricity is imitated
It answers, so that piezoelectric patches not only can be used as supersonic guide-wave generating unit but also be used as damage reflection echo sensing unit, multiple piezoelectric patches
It cooperates, bigger scanning scope can be obtained.Different group damage signals in monitoring region are extracted to be conducive to improve damage
The accuracy of positioning increases considerably the sensitivity of monitoring system.
Pumping signal occur module generate pumping signal as shown in Fig. 2, in pipeline configuration ultrasonic guided wave signals need through
The reflection for crossing damaged structure could be captured.It, can be lossy when ultrasonic guided wave signals are propagated in the duct with the increase of distance.
If excessive signal, which is lost, to be flooded by ambient noise, the loss of damage information may cause.The unresolved above problem, the present invention
In the pumping signal of damage monitoring node select frequency thickness product for 0.52MHzmm, wave crest number is 5, ultrasonic exciting letter
Number centre frequency is the sinusoidal modulation signal of 260kHz, as follows:
I (t)=[H (t)-H (t-N/fc)]×(1-cos(2πfct/N))sin 2πfct
In formula, fcFor the centre frequency of pumping signal, H (t) is Heaviside step function, and N is sin modulated signal
Wave crest number.
Damage monitoring node includes fpga core processing module in the present invention, module occurs for pumping signal, data high-speed is adopted
Collect module, adjustable signal amplification module, wireless transport module and power supply module.Module occurs for pumping signal by excitation waveform
After digital signal is converted into analog signal output, power amplification is carried out by adjustable signal amplification module and is loaded into piezoelectric-array
On, reflection echo signal carries out 65MHz acquisition by data high-speed acquisition module after the amplification of adjustable signal amplification module, together
When, it filters out noise jamming and converts digital signal for damage signal and be sent to wireless transport module.Wireless transport module is real-time
The message teams to be sent such as whether in network have the carrier wave of identical frequency, and when congestion occurs in network if monitoring, data can enter
Column.When the present channel free time, reflection echo data are sequentially sent one by one.Wireless transport module is based on IEEE802.15.4
Network protocol, it is a kind of low-consumption wireless transmission mode, and by its wireless transmission, damage data will reach wireless sensor
Network base station.The control of fpga core processing module responsible node workflow.Power supply module is responsible for providing 3.3V to each module
Stabilized power supply.
Since the signal amplitude of pumping signal generation module generation is smaller, energy is weaker, the ultrasound that can not generate standard is led
Wave, the piezoelectric signal that reflection echo generates also are difficult collected end capture.So using adjustable signal in damage monitoring node
Amplification module can increase pumping signal and received signal power (maximum can be to 40 times of amplification), to expand by piezoelectric-array
The supersonic guide-wave of generation spread scope in pipeline configuration, so that reflection echo identification is stronger.
Wireless sensor network base station is mainly made of CC2630 wireless module in the present invention, its built-in ARM core -32
CPU can collect the data of damage monitoring node upload one by one, be transmitted to lesion assessment unit, while can obtain under terminal
The order reached is once communicated to node.
Lesion assessment unit is mainly made of computer monitoring terminal in the present invention.Computer monitoring terminal connection is wireless to be passed
Sensor network base station and breakdown diagnosis and diagnosis can be carried out to damage echo that system is collected into.Analysis processing function is mainly wrapped
Include the functions such as filtering, the envelope processing of waveform.Damage diagnosis mainly includes the functions such as damage waveform extracting, damage reason location imaging,
By the waveform windowed function acquired in time domain intercept, by relative distance be imaged method to pipeline internal injury carry out positioning with
Imaging, convenient for the intuitive safe condition of solution structure.
As shown in figure 3, network structure of the invention is by several damage monitoring nodes and group of base stations in each monitoring region
At damage monitoring node is responsible for the generation of pumping signal and the acquisition of monitoring data and transmission, it is whole network monitoring of structures
Basis；Base station is responsible for collecting the data that damage monitoring node uploads, and is transmitted to lesion assessment unit by serial mode, it is
The hinge of subnetwork communication plays the important function formed a connecting link to entire wireless sensor network layer of structure；Lesion assessment
Unit is responsible for the analysis and diagnosis of reflection echo signal, it is the terminal of network communication.
Workflow of the invention pastes piezoelectric patches as shown in figure 4, after invention software operation in the way of array
At the outer diameter load position of monitoring pipeline.Hereafter, starting monitoring system carries out structure damage monitoring to pipeline.
Receiving platform of the lesion assessment unit as damage reflection echo data is collected each from wireless sensor network base station
The data of a damage monitoring node, and carry the operation of monitoring software.Damage monitoring node receives under monitoring software from base station
The instruction reached carries out networking.After the completion of networking, damage monitoring node generates pumping signal, and pumping signal is as shown in Figure 2.Signal into
Enter adjustable signal amplification module, realizes the amplification of faint charge signal.Amplified pumping signal acts on defeated on piezoelectric-array
Ultrasonic guided wave signals out.
After piezoelectric-array receives reflection echo, electric signal is exported, is amplified by adjustable signal amplification module, data high-speed is adopted
Collection module is filtered and acquires to amplified signal.The transmit queue of wireless transport module is then gone through, and is opened
Begin to search for wireless sensor network base station.When the wireless sensor network BTS channel free time, acquisition data are uploaded.Wireless sensing
Device network base station is responsible for the data of collector node, and is sent to lesion assessment unit one by one by serial mode.Lesion assessment list
Member realizes Data Analysis Services, damage diagnosis and display function.
The present invention utilizes the characteristics of remote wireless sensor network strong real-time, communication distance, low-power consumption, in conjunction with supersonic guide-wave
The characteristic of damage monitoring realizes the damage monitoring to pipeline configuration and diagnosis.Under complex environment, the present invention can be according to reality
Border detection requirement is placed in any position of pipeline, and easy-to-use and monitoring result is accurate.Cooperate damage imaging technology to section
The damage information that point uploads is diagnosed, can effective maintenance engineering structural health, prevent dangerous generation.
Claims (7)
1. a kind of pipe damage based on wireless sensor network monitors system, which is characterized in that including piezoelectric-array, several damages
Hurt monitoring node, wireless sensor network base station and lesion assessment unit, the piezoelectric-array is arranged in pipeline external surface, is used for
High frequency ultrasound guided wave signals are generated in response to the pumping signal that damage monitoring node issues, the piezoelectric-array is used to receive simultaneously
Meet the reflected echo-signal of pipe damage；The damage monitoring node is for after acquiring echo-signal and amplifying to it
It is sent to wireless sensor network base station；The lesion assessment unit is used for according to the received echo in wireless sensor network base station
Signal carries out damage diagnosis, and pipe damage position is positioned and is imaged.
2. the pipe damage according to claim 1 based on wireless sensor network monitors system, which is characterized in that described
Piezoelectric-array is piezoelectric patches group, and one group of piezoelectric patches group includes 2 at a distance of the same specification circular piezoelectric piece for being 30cm, the piezoelectric patches
Group is along pipeline radial direction with 20cm apart from spaced set.
3. the pipe damage according to claim 2 based on wireless sensor network monitors system, which is characterized in that described
The quantity of piezoelectric patches group is 6 groups or more.
4. the pipe damage according to claim 1 based on wireless sensor network monitors system, which is characterized in that described
Damage monitoring node includes fpga core processing module, module occurs for pumping signal, data high-speed acquisition module, adjustable signal are put
Big module, wireless transport module and power supply module, the pumping signal occurs module and is used to generate pumping signal, described adjustable
Signal amplification module is for amplifying pumping signal, digital signal, and the data high-speed acquisition module is for acquiring amplification
Digital signal afterwards, and it is converted into digital signal；The wireless transport module is with being used to distribute the IP of damage monitoring node
Location simultaneously sends amplified digital signal.
5. according to claim 1 or 4 any pipe damages based on wireless sensor network monitor system, feature exists
It is frequency thickness product in, the pumping signal that the damage monitoring node generates is 0.52MHzmm, centre frequency 260kHz,
The sinusoidal modulation signal that wave crest number is 5, specifically:
I (t)=[H (t)-H (t-N/fc)]×(1-cos(2πfct/N))sin2πfct
F in formulacFor the centre frequency of pumping signal, H (t) is Heaviside function, and N is the wave crest number of sin modulated signal.
6. the pipe damage according to claim 1 based on wireless sensor network monitors system, which is characterized in that wireless
Sensor network base station is CC2630 wireless module.
7. the pipe damage according to claim 1 based on wireless sensor network monitors system, which is characterized in that described
Lesion assessment unit is made of computer monitoring terminal.
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| CN201910517499.6A CN110332463A (en) | 2019-06-14 | 2019-06-14 | Pipeline structure damage monitoring system based on wireless sensor network |
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Cited By (2)
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| CN112660417A (en) * | 2020-12-25 | 2021-04-16 | 湖南航天机电设备与特种材料研究所 | Structural damage diagnosis method and system for aircraft structural component |
| CN114263856A (en) * | 2021-12-27 | 2022-04-01 | 中国石油大学(北京) | Corrosion monitoring system and method based on two-dimensional flexible area array piezoelectric ultrasound |
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Application publication date: 20191015 |