CN104677408B - Device and method for testing fatigue life of optical fiber grating sensors - Google Patents
Device and method for testing fatigue life of optical fiber grating sensors Download PDFInfo
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- CN104677408B CN104677408B CN201510104482.XA CN201510104482A CN104677408B CN 104677408 B CN104677408 B CN 104677408B CN 201510104482 A CN201510104482 A CN 201510104482A CN 104677408 B CN104677408 B CN 104677408B
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- fiber
- grating sensor
- optic grating
- eccentric disc
- cantilever beam
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Abstract
The invention relates to a device and method for testing the fatigue life of optical fiber grating sensors, and belongs to the technical field of sensor tests. A stand column 11 is perpendicularly connected with a base 1; a speed regulator 2 is connected with a motor 3; the motor 3 is fixed to the upper surface of the base 1; the motor 3 is coaxially connected with an eccentric disc 5 through a rotating shaft 4; one end of a connecting-rod connector 6 is fixedly connected with the eccentric disc 5 through a shaft 14; the other end of the connecting-rod connector 6 is fixedly connected with one end of a connecting rod 7; the other end of the connecting rod 7 is connected with the lower end of a spherical connector 8; the upper end of the spherical connector 8 is connected with one end of a cantilever beam 9; the other end of the cantilever beam 9 is fixed at the upper part of the stand column 11; the output terminal of an optical fiber grating sensor 10 is connected with the input terminal of an optical fiber grating demodulator 12; the output terminal of the optical fiber grating demodulator 12 is connected with the input terminal of a data processing module 13. The device disclosed by the invention is simple in structure, convenient to operate, easy to manufacture, and high in testing precision.
Description
Technical field
The present invention relates to a kind of fiber-optic grating sensor fatigue life test device and method, category sensor testing techniques neck
Domain.
Background technology
At present, fiber-optic grating sensor has progressively started to be applied to the army and the people such as Aero-Space, bridge tunnel, wind-power electricity generation
Field carries out monitoring structural health conditions work.But in the monitoring of these heavy construction structures, the fatigue life of sensor is carried
Go out high requirement, i.e. sensor to reach and the structure same longevity.It is generally at present to adopt to the method for testing in sensor fatigue life-span
With fatigue machine, and fatigue machine is expensive;The test specimen for being adopted is generally standard specimen, can install sensor position
Put and limited amount, it is therefore desirable to a kind of fiber-optic grating sensor fatigue experimental device simple, efficiently, inexpensive.
The content of the invention
The invention aims to the cost that the test device for having solved fiber-optic grating sensor fatigue life is present
High, the low problem of efficiency, proposes a kind of fiber-optic grating sensor fatigue life test device and method.
The purpose of the present invention is achieved through the following technical solutions.
A kind of fiber-optic grating sensor fatigue life test device of the present invention, it is characterised in that:Which includes:Base (1),
Speed regulator (2), motor (3), rotary shaft (4), eccentric disc (5), connecting-bar connector (6), connecting rod (7), ball adapter
(8), cantilever beam (9), fiber-optic grating sensor (10), column (11), fiber Bragg grating (FBG) demodulator (12), data processing module (13)
With axle (14).
Base (1) is a level table;Column (11) is vertical with base (1), and is fixedly connected with base (1), base (1)
The supporting construction of the fiber-optic grating sensor fatigue life test device is constituted with column (11).
Speed regulator (2) is connected with the input of motor (3);Motor (3) is fixed on the upper surface of base (1);Motor (3) with
Eccentric disc (5) is fixedly connected by rotary shaft (4), and motor (3), rotary shaft (4) and eccentric disc (5) are coaxial;Axle
(14) through eccentric disc (5), and it is fixedly connected with eccentric disc (5);The axis of axle (14) is put down with the axis of eccentric disc (5)
OK;One end of connecting-bar connector (6) is fixedly connected with axle (14), the other end of connecting-bar connector (6) and one end of connecting rod (7)
It is fixedly connected;The other end of connecting rod (7) is connected with the lower end of ball adapter (8);The upper end of ball adapter (8) and cantilever
One end connection of beam (9);The other end of cantilever beam (9) is fixed on the top of column (11);Fiber-optic grating sensor (10) is fixed
On cantilever beam (9);When axle (14) and eccentric disc (5) the center of circle with it is high when, cantilever beam (9) is horizontal;Optical fiber light
The outfan of gate sensor (10) is connected with the input of fiber Bragg grating (FBG) demodulator (12);The output of fiber Bragg grating (FBG) demodulator (12)
End is connected with the input of data processing module (13).
The effect of the speed regulator (2) is the rotating speed of controlled motor (3).
The effect of the fiber-optic grating sensor (10) is that fiber-optic grating sensor (10) institute is in place in collection cantilever beam (9)
The strain variation amount put.
The function of the fiber Bragg grating (FBG) demodulator (12) is the strain variation amount solution for perceiving fiber-optic grating sensor (10)
It is adjusted to the centre wavelength data of fiber-optic grating sensor (10).
The function of the data processing module (13) is:1. sentenced using the centre wavelength data of fiber-optic grating sensor (10)
Whether disconnected fiber-optic grating sensor (10) is in normal operating conditions.2. the centre wavelength number of storing fiber optic grating sensor (10)
According to.
The axis of the cantilever beam (9) is with the axis of motor (3) on same perpendicular.
The center of circle of the eccentric disc (5) is less with the distance of the central shaft of axle (14), the strain produced to cantilever beam (9)
It is less;The center of circle of eccentric disc (5) is bigger with the distance of the central shaft of axle (14), and the strain produced to cantilever beam (9) is bigger.
Fiber-optic grating sensor (10) fatigue life is tested using the fiber-optic grating sensor fatigue life test device
Concrete operation step be:
Step 1:Whether detection fiber grating sensor (10) signal is normal;If normal, continue the operation of step 2.
Step 2:According to test demand, the distance of the center of circle of eccentric disc (5) and the central shaft of axle (14) is determined.
Step 3:The output of speed regulator (2) is placed in (0,0.5] revolutions per second state, open motor (3) switch.
Step 4:Determine test frequency (being represented with symbol f) and Fatigue Test Time (being represented with symbol T), adjust speed regulator
(2) output frequency is test frequency f, starts fatigue test.
Step 5:Under the control of speed regulator (2), motor (3) is rotated axle (4) and eccentric disc (5) does coaxial rotation
Turn;Cantilever beam (9) is connected with eccentric disc (5) by ball adapter (8), connecting rod (7), connecting-bar connector (6) and axle (14)
Connect, therefore the rotation of eccentric disc (5) drives cantilever beam (9) to do cycle movement;Fiber-optic grating sensor (10) in real time will prison
Survey data is activation and give fiber Bragg grating (FBG) demodulator (12).
The Monitoring Data is the strain variation amount of fiber-optic grating sensor (10) position on cantilever beam (9).
Step 6:Monitoring Data is demodulated into fiber Bragg grating (FBG) demodulator (12) center of fiber-optic grating sensor (10) in real time
Wavelength data, and export and give data processing module (13).
Step 7:Whether data processing module (13) judges current optical fiber grating sensor (10) in normal operating conditions.Such as
Fruit current optical fiber grating sensor (10) is in normal operating conditions, the then operation of repeat step 5 to step 7, until it reaches tired
Labor test period T, terminates test;Now think that fiber-optic grating sensor (10) reaches life expectancy.If current optical fiber grating
Sensor (10) then judges which is not up to life expectancy, terminates test in abnormal operation.
Beneficial effect
Compared with the prior art fiber-optic grating sensor fatigue life test device proposed by the present invention and method relatively have
Following advantage:
(1) apparatus structure is simple, with low cost, greatly reduces the expense of fiber-optic grating sensor fatigue test;
(2) cantilever beam can install multiple sensors in autonomous Design, and a cantilever beam simultaneously, improve fatigue test
Efficiency.
Description of the drawings
Fig. 1 is the structural representation of fiber-optic grating sensor fatigue life test device in the specific embodiment of the invention;
Fig. 2 is the card schematic diagram of eccentric disc (5) in the specific embodiment of the invention;
Wherein, 1- bases, 2- speed regulators, 3- motors, 4- rotary shafts, 5- eccentric discs, 6- connecting-bar connectors, 7- connections
Bar, 8- ball adapters, 9- cantilever beams, 10- fiber-optic grating sensors, 11- columns, 12- fiber Bragg grating (FBG) demodulators, 13- data
Processing module, 14- axles, the first connecting holes of 15-, the second connecting holes of 16-, the 3rd connecting holes of 17-, the 4th connecting holes of 18-.
Specific embodiment
Described in detail below is done to the present invention with reference to the accompanying drawings and examples.
Fiber-optic grating sensor fatigue life test device in the present embodiment, its structure is as shown in figure 1, which includes:Bottom
Seat 1, speed regulator 2, motor 3, rotary shaft 4, eccentric disc 5, connecting-bar connector 6, connecting rod 7, ball adapter 8, cantilever beam 9,
Fiber-optic grating sensor 10, column 11, fiber Bragg grating (FBG) demodulator 12, data processing module 13 and axle 14.
Base 1 is a level table;Column 11 is vertical with base 1, and is fixedly connected with base 1,11 structure of base 1 and column
Into the supporting construction of the fiber-optic grating sensor fatigue life test device.
Speed regulator 2 is connected with the input of motor 3;Motor 3 is fixed on the upper surface of base 1;Motor 3 and eccentric disc 5
It is fixedly connected by rotary shaft 4, and motor 3, rotary shaft 4 and eccentric disc 5 is coaxial;Axle 14 pass through eccentric disc 5, and with
Eccentric disc 5 is fixedly connected;The axis of axle 14 and the diameter parallel of eccentric disc 5;One end of connecting-bar connector 6 is fixed with axle 14
Connection, the other end of connecting-bar connector 6 are fixedly connected with one end of connecting rod 7;The other end of connecting rod 7 and ball adapter 8
Lower end connection;The upper end of ball adapter 8 is connected with one end of cantilever beam 9;The other end of cantilever beam 9 is fixed on column 11
Top;Fiber-optic grating sensor 10 is fixed on cantilever beam 9;When axle 14 and the center of circle of eccentric disc 5 with it is high when, at cantilever beam 9
In horizontal level;The outfan of fiber-optic grating sensor 10 is connected with the input of fiber Bragg grating (FBG) demodulator 12;Fiber grating solution
The outfan of instrument 12 is adjusted to be connected with the input of data processing module 13.
The effect of speed regulator 2 is the rotating speed of controlled motor 3, its model:GAO TAI S120-12.The model of motor 3
For:11SGN, power 120W, rotating speed 1800RPM.The length of rotary shaft 4 is 5cm, a diameter of 6mm.Eccentric disc 5 it is a diameter of
120mm, on eccentric disc 5, arranges the first connecting hole 15, the second connecting hole 16,17 and of the 3rd connecting hole by center to edge
4th connecting hole 18.The center of the first connecting hole 15, the second connecting hole 16, the 3rd connecting hole 17 and the 4th connecting hole 18 and disk
Away from respectively 20mm, 30mm, 40mm, 50mm.The axis of cantilever beam 9 is with the axis of motor 3 on same perpendicular;Cantilever
Beam 9 is the beam of uniform strength, and length is 600mm, and thickness is 4mm, and material is duralumin, hard alumin ium alloy LY12.The effect of fiber-optic grating sensor 10
It is the strain variation amount for gathering 10 position of fiber-optic grating sensor on cantilever beam 9.Its model:FSSR5025.Optical fiber light
The function of grid (FBG) demodulator 12 is that the strain variation amount for perceiving fiber-optic grating sensor 10 is demodulated into fiber-optic grating sensor 10
Centre wavelength data, its model FI220M.The function of data processing module 13 is:1. using in fiber-optic grating sensor 10
Cardiac wave long number is it is judged that whether fiber-optic grating sensor 10 is in normal operating conditions.2. the center of storing fiber optic grating sensor 10
Wavelength data.
10 fatigue life of fiber-optic grating sensor is tested using the fiber-optic grating sensor fatigue life test device
Concrete operation step is:
Step 1:Whether 10 signal of detection fiber grating sensor is normal;If normal, continue the operation of step 2.
Step 2:As test requirements document is strained, value is larger, therefore axle 14 is through the 4th connecting hole 18 of eccentric disc 5, connects
Rod connector 6 is connected with eccentric disc 5 by axle 14, and the strain value of generation is 2000 μ ε.
Step 3:The output of speed regulator 2 is placed in into 0.5 revolutions per second of state, motor 3 is opened and is switched.
Step 4:Determine test frequency f and Fatigue Test Time T, the output frequency for adjusting speed regulator 2 is test frequency f,
Start fatigue test.
Step 5:Under the control of speed regulator 2, motor 3 is rotated axle 4 and eccentric disc 5 does coaxial rotating;Cantilever beam 9
It is connected with eccentric disc 5 by ball adapter 8, connecting rod 7, connecting-bar connector 6 and axle 14, therefore the rotation of eccentric disc 5
Cantilever beam 9 is driven to do cycle movement;Monitoring Data is sent to fiber Bragg grating (FBG) demodulator 12 by fiber-optic grating sensor 10 in real time.
The Monitoring Data is the strain variation amount of 10 position of fiber-optic grating sensor on cantilever beam 9.
Step 6:Monitoring Data is demodulated into fiber Bragg grating (FBG) demodulator 12 centre wavelength of fiber-optic grating sensor 10 in real time
Data, and export to data processing module 13.
Step 7:Whether data processing module 13 judges current optical fiber grating sensor 10 in normal operating conditions.If worked as
Front fiber-optic grating sensor 10 is in normal operating conditions, the then operation of repeat step 5 to step 7, until it reaches fatigue test
Time T, terminates test;Now think that fiber-optic grating sensor 10 reaches life expectancy.If current optical fiber grating sensor 10
In abnormal operation, then judge which is not up to life expectancy, terminate test.
Claims (1)
1. a kind of fiber-optic grating sensor fatigue life test device, it is characterised in that:Which includes:Base (1), speed regulator (2),
Motor (3), rotary shaft (4), eccentric disc (5), connecting-bar connector (6), connecting rod (7), ball adapter (8), cantilever beam
(9), fiber-optic grating sensor (10), column (11), fiber Bragg grating (FBG) demodulator (12), data processing module (13) and axle (14);
Base (1) is a level table;Column (11) is vertical with base (1), and is fixedly connected with base (1), base (1) and vertical
Post (11) constitutes the supporting construction of the fiber-optic grating sensor fatigue life test device;
Speed regulator (2) is connected with the input of motor (3);Motor (3) is fixed on the upper surface of base (1);Motor (3) and bias
Disk (5) is fixedly connected by rotary shaft (4), and motor (3), rotary shaft (4) and eccentric disc (5) are coaxial;Axle (14)
Through eccentric disc (5), and it is fixedly connected with eccentric disc (5);The axis of axle (14) and the diameter parallel of eccentric disc (5);
One end of connecting-bar connector (6) is fixedly connected with axle (14), and the other end of connecting-bar connector (6) is solid with one end of connecting rod (7)
It is fixed to connect;The other end of connecting rod (7) is connected with the lower end of ball adapter (8);The upper end of ball adapter (8) and cantilever beam
(9) one end connection;The other end of cantilever beam (9) is fixed on the top of column (11);Fiber-optic grating sensor (10) is fixed on
On cantilever beam (9);The outfan of fiber-optic grating sensor (10) is connected with the input of fiber Bragg grating (FBG) demodulator (12);Optical fiber light
The outfan of grid (FBG) demodulator (12) is connected with the input of data processing module (13);When the axle (14) and eccentric disc (5)
The center of circle with it is high when, cantilever beam (9) is horizontal;
The effect of the speed regulator (2) is the rotating speed of controlled motor (3);
The effect of the fiber-optic grating sensor (10) is fiber-optic grating sensor (10) position in collection cantilever beam (9)
Strain variation amount;
The function of the fiber Bragg grating (FBG) demodulator (12) is to be demodulated into the strain variation amount that fiber-optic grating sensor (10) is perceived
The centre wavelength data of fiber-optic grating sensor (10);
The function of the data processing module (13) is:1. light is judged using the centre wavelength data of fiber-optic grating sensor (10)
Whether fiber grating sensor (10) is in normal operating conditions;2. centre wavelength data of storing fiber optic grating sensor (10);
The axis of the cantilever beam (9) is with the axis of motor (3) on same perpendicular;
The center of circle of the eccentric disc (5) is less with the distance of the central shaft of axle (14), and the strain that cantilever beam (9) is produced is got over
It is little;The center of circle of eccentric disc (5) is bigger with the distance of the central shaft of axle (14), and the strain produced to cantilever beam (9) is bigger;
Using described fiber-optic grating sensor fatigue life test device test fiber-optic grating sensor (10) fatigue life
Concrete operation step is:
Step 1:Whether detection fiber grating sensor (10) signal is normal;If normal, continue the operation of step 2;
Step 2:According to test demand, the distance of the center of circle of eccentric disc (5) and the central shaft of axle (14) is determined;
Step 3:The output of speed regulator (2) is placed in (0,0.5] revolutions per second state, open motor (3) switch;
Step 4:Determine test frequency f and Fatigue Test Time T, the output frequency for adjusting speed regulator (2) is test frequency f, is opened
Beginning fatigue test;
Step 5:Under the control of speed regulator (2), motor (3) is rotated axle (4) and eccentric disc (5) does coaxial rotating;It is outstanding
Arm beam (9) is connected with eccentric disc (5) by ball adapter (8), connecting rod (7), connecting-bar connector (6) and axle (14), because
The rotation of this eccentric disc (5) drives cantilever beam (9) to do cycle movement;Fiber-optic grating sensor (10) is in real time by Monitoring Data
It is sent to fiber Bragg grating (FBG) demodulator (12);
The Monitoring Data is the strain variation amount of fiber-optic grating sensor (10) position on cantilever beam (9);
Step 6:Monitoring Data is demodulated into fiber Bragg grating (FBG) demodulator (12) centre wavelength of fiber-optic grating sensor (10) in real time
Data, and export and give data processing module (13);
Step 7:Whether data processing module (13) judges current optical fiber grating sensor (10) in normal operating conditions;If worked as
Front fiber-optic grating sensor (10) is in normal operating conditions, the then operation of repeat step 5 to step 7, until it reaches fatigue examination
Time T is tested, terminates test;Now think that fiber-optic grating sensor (10) reaches life expectancy;If current optical fiber grating sensing
Device (10) then judges which is not up to life expectancy, terminates test in abnormal operation.
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