CN109490220A - A kind of large link rod fracture damage on-line detecting system and detection method based on long chirped fiber grating - Google Patents
A kind of large link rod fracture damage on-line detecting system and detection method based on long chirped fiber grating Download PDFInfo
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- CN109490220A CN109490220A CN201811317072.3A CN201811317072A CN109490220A CN 109490220 A CN109490220 A CN 109490220A CN 201811317072 A CN201811317072 A CN 201811317072A CN 109490220 A CN109490220 A CN 109490220A
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- fiber grating
- chirped fiber
- long chirped
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- fracture damage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
Abstract
The invention discloses a kind of large link rod fracture damage on-line detecting systems and detection method based on long chirped fiber grating.The detection system includes wideband light source, coupler, long chirped fiber grating, optical fiber, spectrum analyzer and computer.The detection method are as follows: build the large link rod fracture damage on-line detecting system based on long chirped fiber grating, long chirped fiber grating is fitted into link mechanism side along length of connecting rod direction, and it is fixed, it is passed through broadband optical signal in a fiber, reflection optical spectrum is recorded by spectrum analyzer, analysis spectrum feature, extract the reflectivity and central wavelength information in spectral signature, according to long chirped fiber grating V-I transmission matrix mathematical model, the breaking degree and fracture position of link mechanism are calculated.This system has the characteristics that positioning accuracy is high, measurement is accurate, electromagnetism interference, and can be used in the real time on-line monitoring under equipment working condition, and the inline diagnosis for the Reciprocatories mechanical equipment such as connecting rod provides possibility.
Description
Technical field
The present invention relates to fiber grating nondestructive detection system and detection methods, are more particularly to based on long chirped light
The large link rod fracture damage on-line detecting system and detection method of fine grating, for realizing the connecting rod machine on heavy mechanical equipment
The real time on-line monitoring of structure fracture damage.
Background technique
Connecting rod be connect piston and crankshaft critical component, the major function of connecting rod be by the linear reciprocating motion of piston with
The rotary motion of crankshaft is converted, and is played the role of for the operation of many motive power machine equipments vital.Connecting rod exists
In the course of work, motion conditions are complicated, and stress condition is also more complicated, should bear the effect of tensile, compressive, bending transverse stress, yet
Bear the effect of inertia force.The reliability of connecting rod determines the reliability and service life of dynamic power machine, therefore improves connecting rod
The reliability of mechanism be it is very necessary, on the one hand its fatigue strength can be improved by material and design, it is on the other hand right
Degree of impairment can be found timely to reduce by carrying out real-time online monitoring in the fatigue state and fracture damage of link mechanism
Accident rate improves production efficiency.
It is many for the detection method of the fracture damage of mechanical structure, such as microwave, ultrasonic wave, image recognition, X-ray
Deng being ultrasonic flaw detection wherein most commonly used, have the characteristics that device is simple, precision is high, stability is good.But it is super
There is also many disadvantages for sonic detection, for example have difficulties for the damage check of the mechanical structure under working condition, especially
For swing mechanism and reciprocator.On the one hand under actual condition, the stability of complicated electronic detecting device not can guarantee,
On the other hand often in the presence of vibration, it has an impact frequency of ultrasonic wave etc. to influence detection effect in the operating condition.Cause
This traditional ultrasonic examination can not be applied to the on-line checking under working condition.For rotary machine, pass through divided oscillation signal
Analysis, can analyze the degree of impairment of mechanical structure, but for reciprocating machine structure, vibration signal is relative complex, rule
Property is unobvious, cannot still pass through analysis of vibration signal structural damage.Fast-developing Fiber Bragg Grating technology has anti-electricity in recent years
Magnetic disturbance, be easy to micromation, light weight, it is at low cost the advantages that, be big machinery structure flaw detection especially in the operating condition
Flaw detection provide new direction and solution.
Summary of the invention
The present invention is mentioned for the problem of the especially fracture damage on-line checking hardly possible of connecting rod of big machinery reciprocating structure
A kind of large link rod fracture damage on-line detecting system and detection method based on long chirped fiber grating out, for realizing in work
Make the quick and precisely on-line measurement of the fracture damage of state lower link structure.
The present invention achieves the above technical objects by the following technical means.
A kind of large link rod fracture damage on-line detecting system based on long chirped fiber grating, including wideband light source, coupling
Clutch, long chirped fiber grating, optical fiber, spectrum analyzer and computer.The long chirped fiber grating is fitted in connecting rod knot
The surface of structure；The coupler is separately connected wideband light source, spectrum analyzer and long chirped fiber grating；The wideband light source,
Optical fiber connection, the spectrum analyzer and computer are respectively adopted between coupler, long chirped fiber grating and spectrum analyzer
Between for electrical connection.
In above scheme, the long chirped fiber grating is linear chirp optical fiber grating, and length is specific by link mechanism
Depending on, chirp value 9nm, refractive index modulation degree is 1.5 × 10-4。
A kind of large link rod fracture damage online test method based on long chirped fiber grating, includes the following steps:
1) the large link rod fracture damage on-line detecting system based on long chirped fiber grating is built, it is spare；2) it will grow
Chirped fiber grating fits to the side of link mechanism along length of connecting rod direction, and is fixed, and is bonded it completely；3) it opens
Various parts form power switch, are passed through broadband optical signal in a fiber, record reflected light in optical fiber by spectrum analyzer
Frequency spectrum, and it is transferred to computer disposal；4) collected reflected light spectrum signature is analyzed in a computer, extracts reflection
The reflectivity of characteristic spectrum and central wavelength information in light；5) according to long chirped fiber grating V-I transmission matrix mathematical model,
Calculate the breaking degree and fracture position of link mechanism；6) it will test result to be showed in real time on computers.
In above scheme, the V-I transmission matrix mathematical model in the step 5) determines method, includes the following steps:
1) the large link rod fracture damage on-line detecting system based on long chirped fiber grating is built；2) in long chirped light
The load for applying known dimensions in the known location of fine grating, is tested using load position and size as dual factors；3) in frequency
Fiber reflection light is observed in spectrum analysis instrument respectively, analyzes the spectrum signature of reflected light, reflectivity and reflected light including reflected light
Central wavelength information, and recorded；4) test result is analyzed, the V-I transmission matrix mathematics of long chirped fiber grating is established
Model.
Beneficial effects of the present invention:
(1) the large link rod fracture damage online test method of the present invention based on long chirped fiber grating, with long chirp
Fiber grating is as sensing element, and to occurring, the stress wave that fracture equivalent damage moment generates is very sensitive, passes through reflecting spectrum
Analysis can judge the generation of fracture damage, and can judge the position that fracture occurs by mathematics model analysis.
(2) the large link rod fracture damage online test method of the present invention based on long chirped fiber grating, with light
Carrier as information is transmitted, and is not realized on-line real time monitoring by the interference of electromagnetic field under the adverse circumstances such as factory floor
Without interruption.
Detailed description of the invention
Fig. 1 is the large link rod fracture damage on-line detecting system composition block diagram based on long chirped fiber grating.
Fig. 2 is the large link rod fracture damage on-line detecting system structural schematic diagram based on long chirped fiber grating.
Fig. 3 is the large link rod fracture damage online test method flow chart based on long chirped fiber grating.
Fig. 4 is sensor V-I transmission matrix mathematical model Establishing process figure.
Wherein, 1 is link mechanism；2 be long chirped fiber grating.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is described further, but protection scope of the present invention is simultaneously
It is without being limited thereto.
As shown in Figure 1, a kind of large link rod fracture damage on-line detecting system based on long chirped fiber grating, including width
Band light source, coupler, long chirped fiber grating, optical fiber, spectrum analyzer and computer.As shown in Fig. 2, the long chirped light
Fine grating is fitted in the surface of link mechanism；The coupler is separately connected wideband light source, spectrum analyzer and long chirped fiber
Grating；Optical fiber connection is respectively adopted between the wideband light source, coupler, long chirped fiber grating and spectrum analyzer, it is described
It is to be electrically connected between spectrum analyzer and computer.The long chirped fiber grating be linear chirp optical fiber grating, length by
Depending on link mechanism is specific, chirp value 9nm, refractive index modulation degree is 1.5 × 10-4.
As shown in figure 3, a kind of large link rod fracture damage online test method based on long chirped fiber grating, including such as
Lower step: 1) building the large link rod fracture damage on-line detecting system based on long chirped fiber grating, spare；2)
Long chirped fiber grating is fitted to the side of link mechanism along length of connecting rod direction, and is fixed, is bonded it completely；3)
It opens various parts and forms power switch, be passed through broadband optical signal in a fiber, recorded by spectrum analyzer anti-in optical fiber
Optical spectrum is penetrated, and is transferred to computer disposal；4) collected reflected light spectrum signature is analyzed in a computer, is extracted
The reflectivity of characteristic spectrum and central wavelength information in reflected light；5) according to long chirped fiber grating V-I transmission matrix mathematics
Model calculates the breaking degree and fracture position of link mechanism；6) it will test result to be showed in real time on computers.
As shown in figure 4, the V-I transmission matrix mathematical model in the step 5) determines method, include the following steps:
1) the large link rod fracture damage on-line detecting system based on long chirped fiber grating is built；2) in long chirped light
The load for applying known dimensions in the known location of fine grating, is tested using load position and size as dual factors；3) in frequency
Fiber reflection light is observed in spectrum analysis instrument respectively, analyzes the spectrum signature of reflected light, reflectivity and reflected light including reflected light
Central wavelength information, and recorded；4) test result is analyzed, the V-I transmission matrix mathematics of long chirped fiber grating is established
Model.
The above, only one embodiment of the present invention, but the present invention is not limited to above-described embodiments, only
Wanting it, the technical effect of the present invention is achieved by any identical or similar means, should all fall under the scope of the present invention, this
The specific limited range of invention is referring to claim, and without departing from the basic structure of the case in the present invention, the present invention can be with
Make any type of modification.
Claims (4)
1. a kind of large link rod fracture damage on-line detecting system based on long chirped fiber grating, including wideband light source, coupling
Device, long chirped fiber grating, optical fiber, spectrum analyzer and computer, the long chirped fiber grating are fitted in link mechanism
Surface；The coupler is separately connected wideband light source, spectrum analyzer and long chirped fiber grating；The wideband light source, coupling
Optical fiber connection is respectively adopted between device, long chirped fiber grating and spectrum analyzer, between the spectrum analyzer and computer
For electrical connection.
2. the large link rod fracture damage on-line detecting system according to claim 1 based on long chirped fiber grating,
Be characterized in that: the long chirped fiber grating be linear chirp optical fiber grating, length by link mechanism it is specific depending on, chirp value
For 9nm, refractive index modulation degree is 1.5 × 10-4。
3. a kind of large link rod fracture damage online test method based on long chirped fiber grating, which is characterized in that including such as
Lower step:
1) the large link rod fracture damage on-line detecting system based on long chirped fiber grating as described in claim 1 is built,
It is spare；
2) long chirped fiber grating is fitted to the side of link mechanism along length of connecting rod direction, and is fixed, makes it completely
Fitting；
3) various parts are opened and forms power switch, be passed through broadband optical signal in a fiber, pass through spectrum analyzer recording light
Optical spectrum is reflected in fibre, and is transferred to computer disposal；
4) collected reflected light spectrum signature is analyzed in a computer, extracts the reflectivity of characteristic spectrum in reflected light
And central wavelength information；
5) according to long chirped fiber grating V-I transmission matrix mathematical model, the breaking degree and cleavage of link mechanism are calculated
It sets；
6) it will test result to be showed in real time on computers.
4. the large link rod fracture damage online test method according to claim 3 based on long chirped fiber grating,
Be characterized in that: the V-I transmission matrix mathematical model in the step 5) determines method, includes the following steps:
1) the large link rod fracture damage on-line detecting system based on long chirped fiber grating as described in claim 1 is built；
2) load for applying known dimensions in the known location of long chirped fiber grating, using load position and size as dual factors
It is tested；
3) it observes fiber reflection light respectively in spectrum analyzer, analyzes the spectrum signature of reflected light, the reflection including reflected light
The central wavelength information of rate and reflected light, and recorded；
4) test result is analyzed, the V-I transmission matrix mathematical model of long chirped fiber grating is established.
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