CN106679859A - bolt stress monitoring system and monitoring method - Google Patents
bolt stress monitoring system and monitoring method Download PDFInfo
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- CN106679859A CN106679859A CN201611271174.7A CN201611271174A CN106679859A CN 106679859 A CN106679859 A CN 106679859A CN 201611271174 A CN201611271174 A CN 201611271174A CN 106679859 A CN106679859 A CN 106679859A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000012545 processing Methods 0.000 claims abstract description 11
- 239000000835 fiber Substances 0.000 claims description 81
- 230000000712 assembly Effects 0.000 claims description 24
- 238000000429 assembly Methods 0.000 claims description 24
- 239000013307 optical fiber Substances 0.000 claims description 18
- 230000035945 sensitivity Effects 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 230000035882 stress Effects 0.000 description 13
- 208000037656 Respiratory Sounds Diseases 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
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- 230000007797 corrosion Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
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Classifications
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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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Abstract
The invention discloses a bolt stress monitoring system and a monitoring method, and relates to the field of data monitoring. This bolt atress monitoring system includes: the strain sensor assembly and the temperature sensor are arranged on the bolt; the testing unit is respectively connected with the strain sensor assembly and the temperature sensor, the strain sensor assembly is used for collecting strain parameters of the bolt, and the temperature sensor is used for collecting the environment temperature of the bolt; and the processing unit corrects the strain error caused by the temperature change based on the ambient temperature to obtain an actual strain parameter of the bolt. The invention can improve the monitoring precision of the bolt stress.
Description
Technical field
The present invention relates to data monitoring field, more particularly to a kind of bolt strained monitoring system and monitoring method.
Background technology
Bolt is a kind of connector for being applied to machinery, is usually used in connecting two parts with through hole.Bolt exists
There is indispensable status, in some big machinery devices, many structural members among daily life and commercial production manufacture
It is required to use bolt connection.
The working environment of some of which machinery is often complicated and severe, and these are operated under harsh environments
Bolt in machinery should bear alternate load, and environmental corrosion stress is born again, be particularly useful for connecting the spiral shell of big part
Bolt can produce fatigue under the repeat function of alternate load and environmental stress, or even crackle occur, and the lasting extension of crackle can be led
Bolt is caused the situation of fracture occur, so as to bring serious security risk to bolted part and whole machinery.It is existing
In the stage, the stress parameters of bolt can be acquired, but the temperature change of the working environment when the machinery for applying bolt
When larger, the stress parameters for collecting have relatively large deviation, reduce the precision to bolt strained monitoring.
The content of the invention
Embodiments provide a kind of bolt strained monitoring system and monitoring method, it is possible to increase to bolt strained
The precision of monitoring.
In a first aspect, a kind of bolt strained monitoring system is embodiments provided, including：It is arranged on answering on bolt
Become sensor cluster and temperature sensor；Test cell, is connected respectively with strain sensor assemblies and temperature sensor, and utilizing should
Become the strain parameter that sensor cluster gathers bolt, and the ambient temperature of bolt is gathered using temperature sensor；Processing unit,
Based on ambient temperature to being corrected by strain error caused by temperature change, to obtain the actual strain parameter of bolt.
In some embodiments of first aspect, strain sensor assemblies include fiber Bragg grating strain sensor, optical fiber light
Grid strain transducer is arranged on the surface of bolt along the central axial direction of the stud of bolt；Test cell includes light source and light
Detector, light source and photodetector connect respectively the test lead of fiber Bragg grating strain sensor, and light source to fiber grating strain is passed
The test lead of sensor provides input light wave, the output light-wave of the reflection of photodetector reception optical fiber grating strain transducer.
In some embodiments of first aspect, strain sensor assemblies include four optical fiber with different reflection wavelengths
Grating strain transducer, four fiber Bragg grating strain sensors are spaced 90 degree of settings, four optical fiber light along the circumference of bolt
Grid strain transducer is sequentially connected in series；Photodetector receives the output light-wave of four fiber Bragg grating strain sensor reflections, based on defeated
Go out the circumferential strain parameter of the screw rod of the wavelength change detection bolt of light wave.
In some embodiments of first aspect, above-mentioned bolt strained monitoring system also includes：Temperature sensor is optical fiber
Grating temperature sensor；Fiber-optical grating temperature sensor is connected in series with fiber Bragg grating strain sensor, and photodetector is also received
The output light-wave of fiber-optical grating temperature sensor；Processing unit becomes according to the wavelength of the output light-wave of fiber-optical grating temperature sensor
Change and the sensitivity coefficient of fiber-optical grating temperature sensor, obtain real-time variation of ambient temperature during working bolt.
In some embodiments of first aspect, real-time variation of ambient temperature of the processing unit also based on bolt is utilized
Be provided with the bolt of fiber Bragg grating strain sensor when being not affected by straining with it is strained when fiber Bragg grating strain sensor
The temperature system of the wavelength change of output light-wave, the sensitivity of fiber Bragg grating strain sensor and fiber Bragg grating strain sensor
Number, is calculated the actual strain of bolt；The elastic modelling quantity of the material of actual strain and bolt always according to bolt, obtains bolt
The actual stress born.
Second aspect, a kind of bolt strained monitoring method, including：Distinguished using strain sensor assemblies and temperature sensor
The strain parameter of collection bolt and the ambient temperature of bolt；Ambient temperature based on bolt by strain caused by temperature change to being missed
Difference is corrected, to obtain the actual strain parameter of bolt.
In some embodiments of second aspect, strain sensor assemblies include fiber Bragg grating strain sensor, and method is also
Including：Input light wave is provided to the test lead of fiber Bragg grating strain sensor；The output light of reception optical fiber grating strain transducer
Ripple.
In some embodiments of second aspect, strain sensor assemblies include four optical fiber with different reflection wavelengths
Grating strain transducer, four fiber Bragg grating strain sensors are spaced 90 degree of settings, four optical fiber light along the circumference of bolt
Grid strain transducer is sequentially connected in series；Method also includes：Receive the output light-wave of four fiber Bragg grating strain sensor reflections；It is based on
The circumferential strain parameter of the screw rod of the wavelength change detection bolt of output light-wave.
In some embodiments of second aspect, temperature sensor is fiber-optical grating temperature sensor；Method also includes：Connect
Receive the output light-wave of fiber-optical grating temperature sensor reflection；According to the wavelength change of the output light-wave of fiber-optical grating temperature sensor
And the sensitivity coefficient of fiber-optical grating temperature sensor, obtain real-time variation of ambient temperature during working bolt.
In some embodiments of second aspect, the ambient temperature based on bolt is to by strain error caused by temperature change
It is corrected, the step of with the actual strain parameter for obtaining bolt, including：Based on the real-time variation of ambient temperature of bolt, profit
Be provided with the bolt of fiber Bragg grating strain sensor when strain is not affected by with it is strained when fiber Bragg grating strain sensor
The wavelength change of output light-wave, the sensitivity of fiber Bragg grating strain sensor and fiber Bragg grating strain sensor temperature system
Number, is calculated the actual strain of bolt；According to the elastic modelling quantity of the material of the actual strain and bolt of bolt, obtain bolt and hold
The actual stress received.
Bolt strained monitoring system provided in an embodiment of the present invention and monitoring method, using strain sensor assemblies and temperature
The strain parameter of sensor decibel collection bolt and the ambient temperature of bolt, based on ambient temperature to being answered by caused by temperature change
Become error to be corrected, so as to obtaining the accurate actual strain parameter of bolt such that it is able to more accurately monitoring bolt
Stressing conditions, improve the precision to bolt strained monitoring.
Description of the drawings
From below in conjunction with the accompanying drawings to the present invention specific embodiment description in may be better understood the present invention wherein,
Same or analogous reference represents same or analogous feature.
Fig. 1 is the structural representation of the bolt strained monitoring system in one embodiment of the invention；
Fig. 2 is schematic view of the mounting position of the fiber Bragg grating strain sensor on bolt；
Fig. 3 is the structural representation of the bolt strained monitoring system in an example of the embodiment of the present invention；
Fig. 4 is the schematic cross-section that four fiber Bragg grating strain sensors are arranged on bolt；
Fig. 5 is the flow chart of the bolt strained monitoring method in one embodiment of the invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, it is proposed that many details, to provide complete understanding of the present invention.But, to those skilled in the art
It will be apparent that the present invention can be implemented in the case of some details in not needing these details.Below to implementing
The description of example is just for the sake of by illustrating that the example of the present invention is better understood to provide to the present invention.The present invention is never limited
In any concrete configuration and algorithm set forth below, but cover under the premise of without departing from the spirit of the present invention element,
Any modification, replacement and the improvement of part and algorithm.In the the accompanying drawings and the following description, known structure and skill is not shown
Art, to avoid that unnecessary obscuring is caused to the present invention.
In embodiments of the present invention, load-bearing monitor can be carried out to any bolt in machinery or building,
Bolt in such as to being arranged on bridge, the bolt being arranged in wind-driven generator carry out load-bearing monitor etc., and here is not limited.
Fig. 1 is the structural representation of the bolt strained monitoring system in one embodiment of the invention, as shown in figure 1, bolt is received
Power monitoring system includes the strain sensor assemblies 10 being arranged on bolt and temperature sensor 11, test cell 12 and processes single
Unit 13.Wherein, test cell 12 is connected respectively with strain sensor assemblies 10 and temperature sensor 11, using strain transducer group
Part 10 gathers the strain parameter of bolt, and gathers the ambient temperature of bolt using temperature sensor 11.Processing unit 13 is based on
Ambient temperature to being corrected by strain error caused by temperature change, to obtain the actual strain parameter of bolt.Specifically, should
Variable element can be strain, or stress, here is not limited.The stress of bolt can be supervised using strain parameter
Survey.In an example of the embodiment of the present invention, strain sensor assemblies can be arranged on the screw rod of bolt, it is also possible to arranged
On the hole wall of the installing hole of bolt.When bolt is in running order, that is, when being mounted state, can be joined by the strain of bolt
Number gets the parameters such as corresponding pretightning force, moment of flexure.Can also use these parameters to carry out load-bearing monitor to bolt.
Temperature change can cause the strain parameter obtained using strain sensor assemblies direct measurement to produce strain error, because
This is corrected according to strain error caused by temperature change, can obtain the accurate actual strain parameter of bolt, so as to
The stressing conditions of enough more accurately monitoring bolts, improve the precision to bolt strained monitoring.
In an example of above-described embodiment, what strain sensor assemblies 10 were connected in series including one or more
Fiber Bragg grating strain sensor 101, Fig. 2 is schematic view of the mounting position of the fiber Bragg grating strain sensor on bolt, such as Fig. 2 institutes
Show, fiber Bragg grating strain sensor 101 is arranged on the surface of bolt along the central axial direction of the stud of bolt.In order that
The data of the collection of fiber Bragg grating strain sensor 101 can more accurately, and fiber Bragg grating strain sensor 101 may be disposed at spiral shell
Do not have on bolt on threaded position.
Corresponding, test cell 12 includes light source 121 and photodetector 122.Fig. 3 is an example of the embodiment of the present invention
In bolt strained monitoring system structural representation, as shown in figure 3, light source 121 and photodetector 122 connect respectively optical fiber light
The test lead of grid strain transducer 101, light source 121 to the test lead of fiber Bragg grating strain sensor 101 provides input light wave, light
The output light-wave of the reflection of the reception optical fiber grating strain transducer 101 of detector 122.According to fiber Bragg grating strain sensor 101
Input light wave and fiber Bragg grating strain sensor 101 reflection output light-wave, fiber Bragg grating strain sensor can be obtained
101 stress parameters for sensing.Can be so that during design bolt, accurate according to bolt receives force parameter to bolt
Design is optimized.
In another example of the embodiment of the present invention, strain sensor assemblies 10 include thering is the four of different reflection wavelengths
Individual fiber Bragg grating strain sensor 101, four fiber Bragg grating strain sensors 101 are spaced 90 degree and set along the circumference of bolt
Put, four fiber Bragg grating strain sensors 101 are sequentially connected in series.Fig. 4 is arranged on bolt for four fiber Bragg grating strain sensors 101
On schematic cross-section, as shown in figure 4, four fiber-optic grating sensors 101 are circumferentially uniformly distributed on the periphery wall of bolt,
The position of two adjacent fiber Bragg grating strain sensors 101 differs 90 °, such as can be by four fiber Bragg grating strain sensors
101 are separately positioned at 0 °, 90 °, 180 ° and 270 °.Wherein, photodetector 122 receives four fiber Bragg grating strain sensors
The output light-wave of 101 reflections, the wavelength change based on output light-wave detects the circumferential strain parameter of the screw rod of bolt.
Temperature sensor in above-described embodiment includes but is not limited to fiber-optical grating temperature sensor, thermistor temp and passes
Sensor, sheet type temperature sensor etc..Illustrate so that temperature sensor is as fiber-optic grating sensor as an example below.Optical fiber
Grating temperature sensor is connected in series with fiber Bragg grating strain sensor, and photodetector 122 can be with reception optical fiber grating temperature
The output light-wave of sensor.Wavelength change and optical fiber of the processing unit 13 according to the output light-wave of fiber-optical grating temperature sensor
The sensitivity coefficient of grating temperature sensor, obtains real-time variation of ambient temperature during working bolt.In one example,
Real-time variation of ambient temperature during formula (1) can be reached to calculate working bolt using table below：
Δ T=(λT1-λT0)/CT (1)
Wherein, Δ T is real-time variation of ambient temperature, λ during working boltT1For a certain moment optical fiber grating temperature biography
The wavelength of the output light-wave of sensor, λT0For the wavelength of the output light-wave of another moment fiber-optical grating temperature sensor, CTFor optical fiber
The sensitivity coefficient of grating temperature sensor.During load-bearing monitor is carried out to bolt, it is also desirable to the environment temperature of monitoring bolt
Degree, so as to using the temperature change of the ambient temperature of bolt, to be corrected to strain parameter.Can be by λT0Regard as at room temperature
Bolt fiber-optical grating temperature sensor output light-wave wavelength.
Processing unit 13 is also based on the real-time variation of ambient temperature of bolt, is passed using fiber grating strain is provided with
The bolt of sensor 101 be not affected by strain when with it is strained when fiber Bragg grating strain sensor 101 output light-wave wavelength
The temperature coefficient of change, the sensitivity of fiber Bragg grating strain sensor 101 and fiber Bragg grating strain sensor 101, calculates
To the actual strain of bolt.Processing unit 13 can be according to the elastic modelling quantity of the actual strain of bolt and the material of bolt, obtaining
Obtain the actual stress that bolt bears.In one example, it is possible to use following formula calculates the actual strain and spiral shell of bolt
The actual stress that bolt bears：
Δ ε=(Δ λ-Δ T × CS)×FS (2)
Δ λ=λs1-λs0 (3)
λs0=λ0-(T0-T)×CS (4)
σ=Δ ε × E (5)
Wherein, Δ ε for bolt actual strain, Δ λ be bolt be not affected by strain when with it is strained when fiber grating
The output light-wave of strain transducer wavelength change (i.e. bolt be not affected by strain when with it is strained when fiber grating strain pass
The wavelength difference of the output light-wave of sensor), Δ T is real-time variation of ambient temperature, C during working boltSShould for fiber grating
Become sensor temperature coefficient, unit can for DEG C/pm, FSFor the sensitivity coefficient of fiber Bragg grating strain sensor, unit can be μ
ε/pm, λs1For the wavelength of bolt output light-wave of fiber Bragg grating strain sensor when strained, λs0Strain is not affected by for bolt
When fiber Bragg grating strain sensor output light-wave wavelength, λ0Fiber Bragg grating strain sensor when being not affected by straining for bolt
The initial wavelength of output light-wave, T0It is and λ0The ambient temperature of corresponding bolt, T is room temperature, and E is the springform of the material of bolt
Amount.
One embodiment of the invention additionally provides a kind of bolt strained monitoring method, and Fig. 5 is the spiral shell in one embodiment of the invention
The flow chart of bolt load-bearing monitor method, as shown in figure 5, the method comprising the steps of 201 and step 202.
In step 201, the strain parameter and spiral shell of bolt are gathered respectively using strain sensor assemblies and temperature sensor
The ambient temperature of bolt.
In step 202., the ambient temperature based on bolt is by strain error caused by temperature change to being corrected, to obtain
Obtain the actual strain parameter of bolt.
It is corrected according to strain error caused by temperature change, the accurate actual strain parameter of bolt can be obtained,
So as to the stressing conditions of more accurately monitoring bolt, the precision to bolt strained monitoring is improve.
In one example, strain sensor assemblies include fiber Bragg grating strain sensor, and said method can also include
Step 203 and step 204.
In step 203, input light wave is provided to the test lead of fiber Bragg grating strain sensor.
In step 204, the output light-wave of reception optical fiber grating strain transducer.
In another example, strain sensor assemblies include that there are four fiber grating strains of different reflection wavelengths to pass
Sensor, then said method can also be including step 205 and step 206.
In step 205, the output light-wave of four fiber Bragg grating strain sensor reflections is received.
In step 206, the wavelength change based on output light-wave detects the circumferential strain parameter of the screw rod of bolt.
When temperature sensor is fiber-optical grating temperature sensor, can be obtained by following steps 207 and step 208
Real-time variation of ambient temperature during working bolt：
In step 207, the output light-wave of reception optical fiber grating temperature sensor reflection.
In a step 208, according to the wavelength change and fiber grating temperature of the output light-wave of fiber-optical grating temperature sensor
The sensitivity coefficient of degree sensor, obtains real-time variation of ambient temperature during working bolt.
When strain sensor assemblies include fiber Bragg grating strain sensor, for ambient temperature pair in above-mentioned steps 202
The content for having strain error caused by temperature change to be corrected is specific as follows：Based on the real-time variation of ambient temperature of bolt,
Using be provided with the bolt of fiber Bragg grating strain sensor when strain is not affected by with it is strained when fiber grating strain sensor
The temperature of the wavelength change of the output light-wave of device, the sensitivity of fiber Bragg grating strain sensor and fiber Bragg grating strain sensor
Coefficient, is calculated the actual strain of bolt；According to the elastic modelling quantity of the material of the actual strain and bolt of bolt, bolt is obtained
The actual stress born.
In another embodiment, can be so that according to the stress of bolt, the pretension of bolt can also be calculated
Power and moment of flexure etc. receive force parameter.Obtain pretightning force and moment of flexure of bolt etc. to receive after force parameter, can be according to the pretension of bolt
Power and moment of flexure, judge whether bolt occurs accident with default pretightning force threshold range and moment of flexure threshold range, or
Whether accident will occur.
In an alternative embodiment of the invention, by taking the bolt in wind-driven generator as an example, when wind-driven generator is still not at work
When making state, can be with the pretightning force of monitoring bolt.Bolt strained monitoring system can also include pretightning force judging unit and first
Alarm unit.Pretightning force judging unit may determine that whether the pretightning force of bolt falls into default pretightning force threshold range.When sentencing
When the pretightning force for determining bolt does not fall within default pretightning force threshold range, the first alarm unit can send alarm.
Wherein, the pretightning force of bolt refers to, before bolt is subject to service load, in order to strengthen the reliability of connection and tight
Close property, bolt is being twisted to prevent from being subject to gap or Relative sliding occur between the connector of load rear bolt connection in advance
During plus power.Pretightning force is too small to be caused to produce loosening between bolted connector, and pretightning force is excessive to be also resulted in
The failure of connection.Therefore need whether the pretightning force of monitoring bolt falls in default pretightning force threshold range.Default pretightning force
Threshold range is the normal range of pretightning force, empirically or experimentally result can be obtained.
Alarm can be audio alarm, or image alarm, the type of alarm is not limited here.Attendant
After alarm is got, corresponding measure can be taken, so as to also not cracking in bolt or avoiding risk accidents before rupturing.
In still another embodiment of the process, by taking the bolt in wind-driven generator as an example, when wind-driven generator is in work shape
During state, can be with the moment of flexure of monitoring bolt.Bolt strained monitoring system also includes moment of flexure judging unit and the second alarm unit.Moment of flexure
Judging unit may determine that whether the moment of flexure of bolt falls into default moment of flexure threshold range.When judge bolt moment of flexure do not fall within it is pre-
If pretightning force threshold range when, the second alarm unit can send alarm.
It should be noted that the first alarm unit in the second alarm unit and above-described embodiment in the embodiment of the present invention
An alarm unit, or two alarm units being respectively provided with can be integrated into.
Wherein, the moment of flexure of bolt refers to a kind of moment of resistance on the bolt section of stress.When moment of flexure is excessive, bolt may
Generation crackle or fracture.Therefore need whether the moment of flexure of monitoring bolt falls in default moment of flexure threshold range.Default moment of flexure
Threshold range is the normal range of moment of flexure, empirically or experimentally result can be obtained.
Wherein, alarm can be audio alarm, or image alarm, the type of alarm is not limited here.Dimension
Shield personnel can take corresponding measure after alarm is got, so as to also not cracking in bolt or avoiding wind before rupturing
Dangerous accident.It should be noted that the moment of flexure of bolt do not fall within the alarm sent in default moment of flexure threshold range can be with bolt
Pretightning force not fall within the alarm that sends in default pretightning force threshold range different, it is also possible to it is identical.
Functional unit shown in structures described above block diagram can be implemented as hardware, software, firmware or they
Combination.When realizing in hardware, its may, for example, be electronic circuit, special IC (ASIC), appropriate firmware, insert
Part, function card etc..When being realized with software mode, the element of the present invention is used to perform program or the generation of required task
Code section.Program or code segment can be stored in machine readable media, or are being passed by the data signal carried in carrier wave
Defeated medium or communication links send." machine readable media " can include can store or transmission information any medium.
Additionally, the feature, structure or characteristic described by the above can in any suitable manner combine at one or
In more embodiments.In the following description, there is provided many details are so as to providing the abundant reason to embodiments of the invention
Solution.It will be appreciated, however, by one skilled in the art that technical scheme can be put into practice without in the specific detail
It is one or more, or can be using other methods, constituent element, material etc..In other cases, it is not shown in detail or describes public affairs
Know structure, material or operation to avoid obscuring the major technique intention of the present invention.
Claims (10)
1. a kind of bolt strained monitoring system, it is characterised in that include：
The strain sensor assemblies being arranged on the bolt and temperature sensor；
Test cell, is connected respectively with the strain sensor assemblies and the temperature sensor, using the strain transducer
Component gathers the strain parameter of the bolt, and gathers the ambient temperature of the bolt using the temperature sensor；
Processing unit, based on the ambient temperature to being corrected by strain error caused by temperature change, to obtain the spiral shell
The actual strain parameter of bolt.
2. the system as claimed in claim 1, it is characterised in that the strain sensor assemblies include fiber grating strain sensor
Device, the fiber Bragg grating strain sensor is arranged on the surface of the bolt along the central axial direction of the stud of the bolt
On；
The test cell includes light source and photodetector, and the light source and the photodetector connect respectively the fiber grating
The test lead of strain transducer, the light source to the test lead of the fiber Bragg grating strain sensor provides input light wave, described
Photodetector receives the output light-wave of the reflection of the fiber Bragg grating strain sensor.
3. system as claimed in claim 2, it is characterised in that the strain sensor assemblies include thering is different reflection wavelengths
Four fiber Bragg grating strain sensors, four fiber Bragg grating strain sensors along the bolt circumference be spaced 90
Degree is arranged, and four fiber Bragg grating strain sensors are sequentially connected in series；
The photodetector receives the output light-wave of four fiber Bragg grating strain sensors reflection, based on the output light-wave
Wavelength change detect the bolt screw rod circumferential strain parameter.
4. system as claimed in claim 2, it is characterised in that the temperature sensor is fiber-optical grating temperature sensor；
The fiber-optical grating temperature sensor is connected in series with the fiber Bragg grating strain sensor, and the photodetector is also received
The output light-wave of the fiber-optical grating temperature sensor；
Wavelength change and the optical fiber light of the processing unit according to the output light-wave of the fiber-optical grating temperature sensor
The sensitivity coefficient of grid temperature sensor, obtains real-time variation of ambient temperature during the working bolt.
5. the system as any one of claim 2-4, it is characterised in that the processing unit is also based on the bolt
Real-time variation of ambient temperature, using be provided with the bolt of fiber Bragg grating strain sensor when strain is not affected by with it is strained
The wavelength change of the output light-wave of Shi Suoshu fiber Bragg grating strain sensors, the fiber Bragg grating strain sensor sensitivity with
And the temperature coefficient of the fiber Bragg grating strain sensor, it is calculated the actual strain of the bolt；
The elastic modelling quantity of the material of actual strain and the bolt always according to the bolt, obtains the reality that the bolt bears
Stress.
6. a kind of bolt strained monitoring method, it is characterised in that include：
Gather the strain parameter of the bolt and the environment of the bolt respectively using strain sensor assemblies and temperature sensor
Temperature；
Ambient temperature based on the bolt to being corrected by strain error caused by temperature change, to obtain the bolt
Actual strain parameter.
7. method as claimed in claim 6, it is characterised in that the strain sensor assemblies include fiber grating strain sensor
Device, methods described also includes：
Input light wave is provided to the test lead of the fiber Bragg grating strain sensor；
Receive the output light-wave of the fiber Bragg grating strain sensor.
8. method as claimed in claim 7, it is characterised in that strain sensor assemblies include thering is the four of different reflection wavelengths
Individual fiber Bragg grating strain sensor, four fiber Bragg grating strain sensors are spaced 90 degree and set along the circumference of the bolt
Put, four fiber Bragg grating strain sensors are sequentially connected in series；
Methods described also includes：
Receive the output light-wave of four fiber Bragg grating strain sensors reflection；
Wavelength change based on the output light-wave detects the circumferential strain parameter of the screw rod of the bolt.
9. method as claimed in claim 7, it is characterised in that the temperature sensor is fiber-optical grating temperature sensor；
Methods described also includes：
Receive the output light-wave of the fiber-optical grating temperature sensor reflection；
According to the wavelength change and the fiber-optical grating temperature sensor of the output light-wave of the fiber-optical grating temperature sensor
Sensitivity coefficient, obtain during the working bolt variation of ambient temperature in real time.
10. method as claimed in any one of claims 7-9, it is characterised in that the ambient temperature based on the bolt to by
Strain error is corrected caused by temperature change, the step of with the actual strain parameter for obtaining the bolt, including：
Based on the real-time variation of ambient temperature of the bolt, do not received using the bolt for being provided with fiber Bragg grating strain sensor
When strain with it is strained when the fiber Bragg grating strain sensor the wavelength change of output light-wave, the fiber grating should
Become the sensitivity of sensor and the temperature coefficient of the fiber Bragg grating strain sensor, the reality for being calculated the bolt should
Become；
According to the elastic modelling quantity of the material of the actual strain and the bolt of the bolt, the reality that the acquisition bolt bears should
Power.
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|---|---|---|---|
| CN201611271174.7A CN106679859A (en) | 2016-12-30 | 2016-12-30 | bolt stress monitoring system and monitoring method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611271174.7A CN106679859A (en) | 2016-12-30 | 2016-12-30 | bolt stress monitoring system and monitoring method |
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| CN109186822A (en) * | 2018-08-02 | 2019-01-11 | 大连理工大学 | A kind of bolt fastening faying face face pressure detection method based on FBG sensor |
| CN109186823A (en) * | 2018-08-02 | 2019-01-11 | 大连理工大学 | The scaling method in conjunction with face face pressure is bolted based on FBG sensor detection |
| WO2019153138A1 (en) * | 2018-02-07 | 2019-08-15 | 大连理工大学 | Real-time high-precision bolt preload detection method and system employing piezoelectric ultrasonic chip |
| CN110345019A (en) * | 2019-08-06 | 2019-10-18 | 浙江未来技术研究院(嘉兴) | A kind of detection method and system of blade of wind-driven generator fastening bolt health status |
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| CN110987076A (en) * | 2019-12-18 | 2020-04-10 | 上海交通大学 | Real-time monitoring method for temperature and pretightening force based on composite bolt |
| CN111059123A (en) * | 2019-11-13 | 2020-04-24 | 南昌大学 | Bolt structure capable of measuring pressure and intensity of pressure in real time |
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| WO2019153138A1 (en) * | 2018-02-07 | 2019-08-15 | 大连理工大学 | Real-time high-precision bolt preload detection method and system employing piezoelectric ultrasonic chip |
| US11131579B2 (en) | 2018-02-07 | 2021-09-28 | Dalian University Of Technology | Piezoelectric patch-based real-time and high-precision bolt preload detection method and system |
| CN108590984A (en) * | 2018-04-04 | 2018-09-28 | 浙江运达风电股份有限公司 | A kind of wind generator set blade Payload Monitoring And Control method and device |
| CN108590984B (en) * | 2018-04-04 | 2020-05-26 | 浙江运达风电股份有限公司 | Method and device for monitoring blade load of wind generating set |
| CN109186822A (en) * | 2018-08-02 | 2019-01-11 | 大连理工大学 | A kind of bolt fastening faying face face pressure detection method based on FBG sensor |
| CN109186823A (en) * | 2018-08-02 | 2019-01-11 | 大连理工大学 | The scaling method in conjunction with face face pressure is bolted based on FBG sensor detection |
| CN110345019A (en) * | 2019-08-06 | 2019-10-18 | 浙江未来技术研究院(嘉兴) | A kind of detection method and system of blade of wind-driven generator fastening bolt health status |
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| CN110660197A (en) * | 2019-09-16 | 2020-01-07 | 国网新源水电有限公司富春江水力发电厂 | Real-time alarm method and system for working condition of water turbine top cover bolt |
| CN110660197B (en) * | 2019-09-16 | 2021-07-16 | 国网新源水电有限公司富春江水力发电厂 | Real-time alarm method and system for working condition of water turbine top cover bolt |
| CN111059123A (en) * | 2019-11-13 | 2020-04-24 | 南昌大学 | Bolt structure capable of measuring pressure and intensity of pressure in real time |
| CN110987076A (en) * | 2019-12-18 | 2020-04-10 | 上海交通大学 | Real-time monitoring method for temperature and pretightening force based on composite bolt |
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