CN110967106A - Gear vibration mode detection system and detection method - Google Patents
Gear vibration mode detection system and detection method Download PDFInfo
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- CN110967106A CN110967106A CN201911219752.6A CN201911219752A CN110967106A CN 110967106 A CN110967106 A CN 110967106A CN 201911219752 A CN201911219752 A CN 201911219752A CN 110967106 A CN110967106 A CN 110967106A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H9/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means
- G01H9/004—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means using fibre optic sensors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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Abstract
The invention provides a gear vibration mode detection system and a detection method based on fiber bragg grating strain detection. The invention uses the fiber grating strain sensor to measure the surface strain change of the gear plate under the working state, converts the strain change into the fiber grating central wavelength change, and then realizes the strain signal detection by the photoelectric conversion and the signal processing of the optical signal. The invention is mainly used for detecting the vibration mode of the gear disc, has the advantages of high sensitivity, high response speed, wide response frequency band, long transmission distance, strong anti-electromagnetic interference capability, high measurement precision, low hardware cost, high operation speed and the like, and can effectively and accurately detect the modal vibration mode of the gear disc.
Description
Technical Field
The invention belongs to the technical field of fiber bragg grating detection, and particularly relates to a gear vibration mode detection system and method based on fiber bragg grating strain detection.
Background
The fiber grating sensor is a special fiber sensor, and not only has the advantages of a common fiber sensor, but also has a plurality of other characteristics. It is a wavelength modulation type sensor that acquires physical information to be measured by detecting a change value of the center wavelength of light. Therefore, the influence of the bending loss of the optical fiber on the light intensity does not need to be worried about, and the flexible lapping of the optical path is not influenced. Compared with the traditional electric sensor, the fiber grating sensor has the advantages of good chemical property, corrosion resistance and electromagnetic interference resistance. Therefore, the fiber grating sensing technology is widely applied to the fields of bridge and road structure health monitoring, biomedicine, aerospace vehicles, ships, weapons, geological disaster prediction and the like.
At present, the gear vibration mode detection technology mainly takes a piezoelectric ceramic acceleration sensor or a sound pressure sensor as a main part. Although the piezoelectric ceramic acceleration sensor has higher sensitivity and precision, the piezoelectric ceramic acceleration sensor does not resist electromagnetic interference. The piezoelectric ceramic acceleration sensor and the transmission line thereof have overlarge additional mass for a light gear disc, and have great influence on the natural frequency of the gear disc and the vibration mode of a heavy root mode of the gear disc, while the sound pressure sensor is anti-electromagnetic interference and does not have the influence on the additional mass of the gear disc due to non-contact measurement, but has strict requirement on environmental noise, so that experimental mode analysis is often performed under laboratory conditions, and operation mode analysis cannot be performed at present under a complicated working environment of an industrial field. The optical fiber has the advantages of strong electromagnetic interference resistance, light weight, small volume, corrosion resistance, low loss and the like, so that the optical fiber can normally work in severe environment
Disclosure of Invention
Technical problem to be solved
The invention provides a gear vibration mode detection system and method based on fiber bragg grating strain detection, and aims to solve the technical problem of accurately detecting the gear vibration mode.
(II) technical scheme
In order to solve the technical problem, the invention provides a gear vibration mode detection system based on fiber bragg grating strain detection, which comprises an ASE broadband light source, a fiber circulator, a fiber bragg grating strain sensor, a photoelectric detection unit and an electric processing unit; wherein the content of the first and second substances,
the ASE broadband light source is connected with the A end of the optical fiber circulator, and the B end of the optical fiber circulator is connected with the fiber bragg grating strain sensor; the C end of the optical fiber circulator is connected with a photoelectric detection unit, the photoelectric detection unit is connected with an electric processing unit, and the electric processing unit is connected with an upper computer;
the photoelectric detection unit comprises a collimating lens, a dispersion unit, a condensing lens and a detection unit; the electric processing unit comprises a control circuit, a DSP circuit and a memory; wherein the content of the first and second substances,
light emitted by the ASE broadband light source is input from the end A of the optical fiber circulator, then enters the fiber bragg grating strain sensor from the end B of the optical fiber circulator, and light reflected from the fiber bragg grating strain sensor is input from the end B of the optical fiber circulator; the light output from the C end of the optical fiber circulator is collimated by the collimating lens and irradiates on the dispersion unit, the light with multiple wavelengths generates diffraction dispersion, the light with different wavelengths is separated by the dispersion unit and forms diffraction bands, the diffraction bands are focused by the condensing lens and irradiate on different positions of the detection unit, the optical signals with different wavelengths are detected by the detection unit and converted into electric signals, and the electric signals containing the spectrum information are transmitted to the DSP circuit through the control circuit to be processed and stored in the memory; and reading the data in the memory by the upper computer.
Further, the dispersion unit employs a holographic phase grating.
Furthermore, the detection unit adopts an indium gallium arsenide detection array.
Furthermore, the bandwidth of the ASE broadband light source is 1525-1565m, the output light power is 0-10mw, and the spectral flatness is less than or equal to 1.5 dB.
Further, the wavelength range of the optical fiber circulator is 1525-1610nm, and the connector is FC/APC.
In addition, the invention also provides a gear vibration mode detection method based on fiber bragg grating strain detection, and the detection system is adopted, and the detection method comprises the following steps: dividing the surface of a gear wheel of a gear to be detected into a plurality of detection points; adhering a plurality of fiber bragg grating strain sensors to the surface of a gear plate; and supporting the gear, knocking the surface of the gear disc, and acquiring data once by knocking, so as to obtain the gear vibration mode.
Further, the surface of the gear disc of the gear to be detected is equally divided along the radial direction, and equally divided along the circumferential direction, so that a plurality of detection points are obtained.
Further, a plurality of fiber grating strain sensors are welded into a string.
Further, before the fiber bragg grating strain sensor is adhered, the surface of the gear disc is polished by abrasive paper and is wiped clean by alcohol cotton.
Furthermore, a force hammer is used for knocking the surface of the gear disc, and a metal head is selected as the hammer head.
(III) advantageous effects
The invention provides a gear vibration mode detection system and a detection method based on fiber bragg grating strain detection. The invention uses the fiber grating strain sensor to measure the surface strain change of the gear plate under the working state, converts the strain change into the fiber grating central wavelength change, and then realizes the strain signal detection by the photoelectric conversion and the signal processing of the optical signal. The invention is mainly used for detecting the vibration mode of the gear disc, has the advantages of high sensitivity, high response speed, wide response frequency band, long transmission distance, strong anti-electromagnetic interference capability, high measurement precision, low hardware cost, high operation speed and the like, and can effectively and accurately detect the modal vibration mode of the gear disc.
Drawings
Fig. 1 is a schematic diagram of a gear vibration pattern detection system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
The present embodiment provides a fiber grating strain detection-based gear vibration mode detection system, which is composed of an ASE broadband light source 1, an optical fiber circulator 2, a fiber grating strain sensor 3, a photoelectric detection unit, and an electrical processing unit 8, as shown in fig. 1. The ASE broadband light source 1 is connected with the end A of the optical fiber circulator 2, and the end B of the optical fiber circulator 2 is connected with the optical fiber grating strain sensor 3; the C end of the optical fiber circulator 2 is connected with a photoelectric detection unit, the photoelectric detection unit is connected with an electric processing unit 8, and the electric processing unit 8 is connected with an upper computer.
In the present embodiment, the photodetection unit includes the collimator lens 4, the dispersion unit 5, the condenser lens 6, and the detection unit 7, and the electrical processing unit 8 includes the control circuit 9, the DSP circuit 10, and the memory 11. Light emitted by the ASE broadband light source 1 is input from the end A of the optical fiber circulator 2, then enters the fiber grating strain sensor 3 from the end B of the optical fiber circulator 2, and light reflected from the fiber grating strain sensor 3 is input from the end B of the optical fiber circulator 2; light output from the C end of the optical fiber circulator 2 is collimated by a collimating lens 4 and is irradiated on a dispersion unit 5 adopting a holographic phase grating, light with multiple wavelengths generates diffraction dispersion, light with different wavelengths is separated by the holographic phase grating and forms diffraction bands, the diffraction bands are finally focused by a condensing lens 6 and are irradiated on different positions of a detection unit 7 adopting an indium gallium arsenide (InGaAs) detection array, optical signals with different wavelengths are detected by the detection unit 7 and are converted into electric signals, and the electric signals containing spectral information are transmitted to a DSP circuit 10 through a control circuit 9 to be processed and stored in a memory 11. The upper computer can read the original data in the memory 11 and process the data through a serial port (RS-2232 or USB) or a parallel port.
In this embodiment, the bandwidth of the ASE broadband light source 1 is 1525-1565m, the output optical power is 0-10mw, and the spectral flatness is less than or equal to 1.5 dB. The wavelength range of the optical fiber circulator 2 is 1525-1610nm, and the joint is FC/APC.
The method for detecting the vibration mode of the gear by adopting the detection system of the embodiment specifically comprises the following steps: dividing the surface of a gear wheel of a gear to be measured into 3 equal parts along the radial direction, and dividing the gear wheel into 8 equal parts along the circumferential direction to obtain 24 detection points; welding 24 fiber grating strain sensors 3 into a string, polishing the surface of a gear disc by using 500-mesh abrasive paper before the fiber grating strain sensors 3 are adhered, then wiping the surface by using alcohol cotton, and adhering the fiber grating strain sensors 3 to the surface of the gear disc along the tangential direction by using 502 glue; a steel column is used for supporting a gear, a force hammer strikes the surface of a gear disc, and data are collected once when the force hammer strikes one point each time. In order to excite higher frequency, the hammer head is a metal head.
Compared with the prior art, the invention has the advantages that: the piezoelectric ceramic acceleration sensor is used for detecting signals, so that the anti-electromagnetic interference capability is poor, and the quality of the piezoelectric ceramic acceleration sensor greatly affects a gear disc; the sound pressure sensor is used for detecting signals, so that the requirement on a noise environment is strict; the invention adopts the fiber grating sensor, can accurately measure the vibration mode and the heavy root mode of the gear plate, and has higher response speed and higher demodulation precision.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A gear vibration mode detection system based on fiber bragg grating strain detection is characterized by comprising an ASE broadband light source, a fiber circulator, a fiber bragg grating strain sensor, a photoelectric detection unit and an electric processing unit; wherein the content of the first and second substances,
the ASE broadband light source is connected with the end A of the optical fiber circulator, and the end B of the optical fiber circulator is connected with the fiber bragg grating strain sensor; the C end of the optical fiber circulator is connected with the photoelectric detection unit, the photoelectric detection unit is connected with the electric processing unit, and the electric processing unit is connected with an upper computer;
the photoelectric detection unit comprises a collimating lens, a dispersion unit, a condensing lens and a detection unit; the electric processing unit comprises a control circuit, a DSP circuit and a memory; wherein the content of the first and second substances,
light emitted by the ASE broadband light source is input from the A end of the optical fiber circulator and then enters the fiber bragg grating strain sensor from the B end of the optical fiber circulator, and light reflected from the fiber bragg grating strain sensor is input from the B end of the optical fiber circulator; the light output from the C end of the optical fiber circulator is collimated by the collimating lens and irradiates the dispersion unit, the light with multiple wavelengths generates diffraction dispersion, the light with different wavelengths is separated by the dispersion unit and forms diffraction bands, the diffraction bands are focused by the condensing lens and irradiate different positions of the detection unit, optical signals with different wavelengths are detected by the detection unit and converted into electric signals, and the electric signals containing spectral information are transmitted to the DSP circuit through the control circuit to be processed and stored in the memory; and reading the data in the memory by the upper computer.
2. The detection system of claim 1, wherein the dispersive unit employs a holographic volume phase grating.
3. The detection system of claim 1, wherein the detection unit employs an ingaas detection array.
4. The detection system as claimed in claim 1, wherein the ASE broadband light source has a bandwidth of 1525-.
5. The detection system of claim 1, wherein the fiber optic circulator has a wavelength range of 1525 and 1610nm and the connector is FC/APC.
6. A gear vibration mode detection method based on fiber bragg grating strain detection is characterized in that the detection system is adopted, and the detection method comprises the following steps: dividing the surface of a gear wheel of a gear to be detected into a plurality of detection points; adhering a plurality of fiber bragg grating strain sensors to the surface of a gear plate; and supporting the gear, knocking the surface of the gear disc, and acquiring data once by knocking, so as to obtain the gear vibration mode.
7. The gear vibration mode detection method according to claim 6, wherein the surface of the gear disk of the gear to be measured is equally divided in the radial direction and equally divided in the circumferential direction to obtain a plurality of detection points.
8. The gear mode detection method of claim 6, wherein a plurality of fiber grating strain sensors are fused into a string.
9. The method for detecting the vibration mode of the gear according to claim 6, wherein the surface of the gear disc is polished by sand paper and cleaned by alcohol cotton before the fiber bragg grating strain sensor is attached.
10. The method for detecting the vibration mode of the gear according to claim 6, wherein a force hammer is used for knocking the surface of the gear disc, and a metal head is used as the hammer head.
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| CN201911219752.6A CN110967106A (en) | 2019-12-03 | 2019-12-03 | Gear vibration mode detection system and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112378343A (en) * | 2020-11-12 | 2021-02-19 | 新疆大学 | System and method for dynamically detecting multipath strain of planetary gear box of wind driven generator |
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| CN104101380A (en) * | 2014-07-02 | 2014-10-15 | 西安交通大学 | Method for measuring stress and strain of gear root of fixed center gear of planetary gear train |
| CN106225910A (en) * | 2016-08-23 | 2016-12-14 | 武汉理工大学 | Runner vibration measurement method based on fiber grating and device |
| CN107402112A (en) * | 2017-08-25 | 2017-11-28 | 北京航空航天大学 | A kind of operational modal analysis system and method based on optical fiber sensing network |
| CN211317502U (en) * | 2019-12-03 | 2020-08-21 | 北京北方车辆集团有限公司 | Gear vibration mode detecting system |
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- 2019-12-03 CN CN201911219752.6A patent/CN110967106A/en active Pending
Patent Citations (6)
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| JP2011149828A (en) * | 2010-01-22 | 2011-08-04 | National Institute Of Advanced Industrial Science & Technology | Vibration detection system, device using the system, and vibration detection method |
| US20130008253A1 (en) * | 2010-03-18 | 2013-01-10 | National Institute Of Advanced Industrial Science And Technology | Fbg vibration detection system, apparatus and vibration detection method using the system |
| CN104101380A (en) * | 2014-07-02 | 2014-10-15 | 西安交通大学 | Method for measuring stress and strain of gear root of fixed center gear of planetary gear train |
| CN106225910A (en) * | 2016-08-23 | 2016-12-14 | 武汉理工大学 | Runner vibration measurement method based on fiber grating and device |
| CN107402112A (en) * | 2017-08-25 | 2017-11-28 | 北京航空航天大学 | A kind of operational modal analysis system and method based on optical fiber sensing network |
| CN211317502U (en) * | 2019-12-03 | 2020-08-21 | 北京北方车辆集团有限公司 | Gear vibration mode detecting system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112378343A (en) * | 2020-11-12 | 2021-02-19 | 新疆大学 | System and method for dynamically detecting multipath strain of planetary gear box of wind driven generator |
| CN112378343B (en) * | 2020-11-12 | 2022-06-07 | 新疆大学 | System and method for dynamically detecting multipath strain of planetary gear box of wind driven generator |
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