CN108318248B - Optical fiber vibration sensing-based bearing state online monitoring system - Google Patents
Optical fiber vibration sensing-based bearing state online monitoring system Download PDFInfo
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- CN108318248B CN108318248B CN201710032443.2A CN201710032443A CN108318248B CN 108318248 B CN108318248 B CN 108318248B CN 201710032443 A CN201710032443 A CN 201710032443A CN 108318248 B CN108318248 B CN 108318248B
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Abstract
The invention provides a bearing state online monitoring system and method based on optical fiber vibration sensing. The laser generating device is used for emitting pulse laser to the circulator, the optical scanning device is used for inputting the pulse laser from the circulator to the vibration sensing optical cables in a time division mode, each vibration sensing optical cable in the vibration sensing optical cables is used for sensing vibration of one or more bearings, scattered light signals with bearing vibration information and transmitted from the vibration sensing optical cables are input to the photoelectric detector through the optical scanning device and the circulator, the photoelectric detector converts the scattered light signals into electric signals and transmits the electric signals to the signal collecting and processing module, and the signal collecting and processing module is used for processing the electric signals and determining the working state of the bearings according to the electric signals. A plurality of vibration sensing optical cables are formed in a parallel relationship. The length of each vibration sensing optical cable can be shortened, the sensitivity of the monitoring system is improved, and the cost of the monitoring system is reduced.
Description
Technical Field
The invention belongs to the technical field of on-line monitoring of bearing states, and particularly relates to an intelligent on-line monitoring system of a bearing state based on optical fiber vibration sensing, which can realize state monitoring of a large number of bearings at low cost.
Background
The bearing state online monitoring system based on temperature sensing can detect abnormal conditions by monitoring the change of the working temperature of the bearing, because when the bearing fails, the abrasion of the bearing is accelerated rapidly, and the working temperature is increased correspondingly.
The bearing state online monitoring system based on the vibration sensing can detect abnormal conditions and effectively judge failure types due to the amplitude-frequency characteristics of vibration signals detected by vibration sensors such as an accelerometer and the like. And comparing the characteristic vector extracted from the vibration signal with a failure mode database to realize the mode identification of the bearing failure type.
Fiber optic sensing technology provides a new vibration detection solution. Under the action of the rayleigh effect, the laser light transmitted in the optical fiber generates backward scattered light due to the random fluctuation of the spatial distribution of atoms or molecules inside the optical fiber. When vibration exists in the environment, the vibration can cause the optical fiber to generate stress strain, and the backward transmission scattered light signal is changed correspondingly. Therefore, the whole optical fiber can transmit laser and can be used as a vibration sensor. This advantage of fiber optic sensing technology makes it well suited for monitoring multiple bearings simultaneously.
In the existing technical scheme based on temperature sensing, each bearing needs at least one temperature sensing unit comprising a sensing part, a power supply part and a communication part, and the number of the system monitoring bearings is limited by the signal processing capacity of a circuit. Multiple sets of on-line monitoring systems are required if multiple bearings are to be monitored, which is costly and resource-wasting. In addition, the technical solution based on temperature sensing cannot judge the specific failure type.
The existing vibration sensing technical scheme based on the accelerometer also has the problem that each bearing needs at least one set of vibration sensing unit and the monitoring quantity of the bearings is limited by the signal processing capability of a circuit.
Although the optical fiber vibration sensing technology can solve the problem of resource waste in the sensing technical scheme based on the temperature sensing and the accelerometer in a mode of monitoring a plurality of bearings through one optical fiber, the cost is still high. It will be readily appreciated that a greater number of monitoring bearings means a longer vibration sensing fibre. Since the intensity of the rayleigh scattered light signal is positively correlated with the power of the laser, a long vibration sensing fiber requires a high-power laser. Meanwhile, the laser is also lost during the transmission of the optical fiber. The current solution of increasing the detection distance by using powerful lasers and optical power amplifiers increases the system cost considerably.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a low-cost on-line monitoring system and method for the bearing state based on optical fiber vibration sensing, which can monitor the states of a plurality of bearings simultaneously, based on the recognition that most of the reasons for bearing failure are mainly fatigue failure, and therefore the updating speed requirement of the monitoring data by the bearing state monitoring system is not high.
The present invention may employ, but is not limited to, the following schemes.
An on-line monitoring system for the bearing state based on optical fiber vibration sensing comprises a laser generator, a circulator, an optical scanner, multiple vibration sensing optical cables, a photoelectric detector, and a signal acquisition and processing module,
the laser generating device is used for emitting pulse laser,
the pulse laser generated by the laser generating device enters the optical scanning device through the circulator,
the optical scanning device is used for inputting the pulse laser to the plurality of vibration sensing optical cables in a time division manner,
each vibration sensing optical cable of the vibration sensing optical cables is used for sensing the vibration of one or more bearings, scattered light signals with bearing vibration information transmitted from the vibration sensing optical cables enter the photoelectric detector through the optical scanning device and the circulator,
the photoelectric detector is used for converting the scattered light signals into electric signals and transmitting the electric signals to the signal acquisition and processing module,
the signal acquisition and processing module is used for processing the electric signal transmitted from the photoelectric detector and determining the working state of the bearing according to the electric signal.
Preferably, the laser generating device includes a laser and a pulse modulator, and laser light generated by the laser is modulated by the pulse modulator and then enters the optical scanning device through the circulator.
Preferably, the ends of the vibration sensing optical cables far away from the optical scanning device are connected with attenuators, and the attenuators are used for attenuating the pulse laser light transmitted in the vibration sensing optical cables. Thus, the laser light transmitted to the end of the vibration sensing optical cable is prevented from reflecting backward (toward the optical scanning device), and the detection accuracy of the scattered light signal is improved.
Preferably, the monitoring system further comprises a bearing fault mode database, and the signal acquisition and processing module compares the electric signal obtained by the signal acquisition and processing module with data in the bearing fault mode database to determine the working state and/or the failure type of the bearing.
Preferably, the optical scanning device includes a reflecting mirror to which the pulse laser light from the circulator is incident, a motor that moves the reflecting mirror to reflect the pulse laser light to a selected laser coupler among the plurality of laser couplers, and a plurality of laser couplers that are respectively connected to the plurality of vibration sensing optical cables to cause the pulse laser light to be incident into a corresponding vibration sensing optical cable.
Preferably, the optical scanning device includes two parallel mirrors and a fixing plate, the two parallel mirrors are mounted to the fixing plate, the fixing plate is mounted to the spindle of the motor, end surfaces of the two parallel mirrors are not on the same plane, and a center of symmetry of the two parallel mirrors is on the spindle axis of the motor.
Preferably, the vibration sensing optical cable comprises a sensing part with a suspended fiber core and a solid transmission part, the transmission part and the sensing part are alternately arranged in the length direction of the vibration sensing optical cable, the sensing part is used for being mounted on the bearing to sense the vibration of the bearing, and the transmission part is used for transmitting the pulse laser and the scattered light.
Preferably, the sensing portion of the vibration sensing cable is wound in a circumferential groove of a flange of an end cap at the shaft end, the transmission portion of the vibration sensing cable is fixed, and the flange of the end cap of the bearing abuts against an outer ring of the bearing to receive vibration of the bearing.
Preferably, the portion of the monitoring system outside the vibration sensing cable is placed in an intermediate position with respect to the plurality of bearings to be monitored.
A bearing state online monitoring method based on optical fiber vibration sensing comprises the following steps:
emitting pulse laser;
inputting the pulsed laser light into a plurality of vibration sensing cables in a time division manner, wherein each vibration sensing cable is connected to one or more bearings to sense vibration of the bearings;
and converting the scattered light signals with the bearing vibration information transmitted from the vibration sensing optical cables into electric signals, processing the electric signals, and determining the working state of the bearing according to the electric signals.
The monitoring method may be implemented using the monitoring system according to the invention.
In the system and the method for monitoring the state of the bearing on line based on the optical fiber vibration sensing, the optical scanning device is used for inputting the pulse laser from the laser generating device to a plurality of vibration sensing optical cables in a time division manner. Thus, a plurality of vibration sensing optical cables are formed in a parallel relationship. The length of each vibration sensing cable can be shortened without reducing the number of bearings that can be monitored in total. Therefore, the power of the laser light transmitted in the vibration sensing optical cable can be reduced or better sensitivity can be obtained under the condition of lower laser power. In the present application, since the length of each vibration sensing optical cable is shortened, a low power laser can be used and/or an optical power amplifier can be omitted, and thus the cost of the monitoring system can be reduced.
Drawings
Fig. 1 is a schematic structural diagram of a bearing state online monitoring system based on optical fiber vibration sensing according to an embodiment of the invention.
Fig. 2 is a schematic structural view of an optical scanning device in the monitoring system of fig. 1.
Fig. 3 is an operation schematic diagram of the optical scanning apparatus of fig. 2.
FIG. 4 is an axial cross-sectional schematic view of a vibration sensing cable in the monitoring system of FIG. 1.
FIG. 5 is a schematic view of one manner of mounting the vibration sensing cable to the bearing in the monitoring system of FIG. 1.
List of reference numerals
1 laser, 2 pulse modulator, 3 circulator, 4 optical scanning device, 5 vibration sensing optical cable, 6 bearing, 7 attenuator, 8 photoelectric detector, 9 signal acquisition and processing module, 10 power module, 401A, 401B, 401A ', 401B ' reflector, 402 fixing plate, 403 motor, 404A, 404B, 404C laser coupler, 101 incident laser, 102 ' emergent laser, 405 symmetrical center, 501 transmission part, 502 sensing part, 503 fiber core, 504 protective sleeve, 505 cladding, 601 end cover, 602 circular ring plate, 603 flange, 604 circumferential groove
Detailed Description
Referring to fig. 1, an on-line bearing state monitoring system based on optical fiber vibration sensing (hereinafter, also referred to simply as "monitoring system") according to an embodiment of the present invention includes a laser 1, a pulse modulator 2, a circulator 3, an optical scanning device 4, a vibration sensing optical cable 5, an attenuator 7, a photodetector 8, a signal acquisition and processing module 9, and a power supply module 10.
After laser generated by the laser 1 is modulated into pulse laser by the pulse modulator 2, the pulse laser enters one vibration sensing optical cable 5 of the plurality of (n) vibration sensing optical cables 5 through the circulator 3 and the optical scanning device 4 to detect vibration of the plurality of (m) bearings 6 under the working condition. Vibration of the bearing 6 causes a change in the stress of the optical fibre in the vibration sensing cable 5, causing a corresponding change in the rayleigh scattered light signal. The rayleigh scattered light signal with bearing vibration information passes through the optical scanning device 4 and the circulator 3 backwards (i.e. in the direction opposite to the laser advancing direction), is received by the photodetector 8, is converted into an electric signal, and is processed by the signal acquisition and processing module 9. The forward laser light finally enters the attenuator 7 to be attenuated.
Since each bearing 6 detected by the same vibration sensing optical cable 5 is at a different distance from the photodetector 8, the vibration signal of each bearing can be distinguished by the time at which the signal is received. In the signal collecting and processing module 9, the rayleigh scattering electrical signal is processed and then compared with a bearing failure database, so as to determine the working state of the bearing 6. The optical scanning device 4 is controlled to connect the circulator 3 and the vibration sensing optical cables 5 of different branches, thereby achieving condition monitoring of a large number of bearings.
The signal acquisition and processing module 9 may comprise an AD converter and a microprocessor. The signal acquisition and processing module 9 may be connected to the pulse modulator 2 to control the modulation mode of the pulse modulator 2. Although the laser 1 and the pulse modulator 2 in the present application may be replaced by one laser emitting pulsed laser light, in the combination of the laser 1 and the pulse modulator 2 of the present invention, the laser 1 emitting continuous light and thus being cheaper may be used, and the pulse modulator 2 may generate pulsed laser light of different modulation modes by the control of the pulse modulator 2 by the signal acquisition and processing module 9. It should be understood that the laser 1 and the pulse modulator 2 in the present application may also be collectively referred to as a laser generating device for emitting pulsed laser light. The circulator 3 serves for transmitting the pulsed laser light from the pulse modulator 2 to the optical scanning device 4 and for transmitting scattered light signals from the optical scanning device 4 to the photodetector 8. Circulators are known as non-reciprocal devices having several ends. In the present application, the circulator 3 has at least three ends. For example, the pulse laser light from the pulse modulator 2 enters the circulator 3 from the end 1, and is output from the end 2 to the optical scanning device 4; the scattered light signal from the optical scanning device 4 enters the circulator 3 from the end 2 and is output to the photodetector 8 from the end 3.
The signal collecting and processing module 9 is further connected to the optical scanning device 4 to control the optical scanning device 4 to communicate the circulator 3 with the vibration sensing optical cables 5 of different branches, and the signal collecting and processing module 9 may also control a holding time of the optical scanning device 4 to communicate the circulator 3 with one of the vibration sensing optical cables 5, i.e. to monitor a duration of time during which the one of the vibration sensing optical cables 5 is connected to the bearing 6. The holding time or duration may be determined according to the number of bearings 6 to which the vibration sensing optical cable 5 is connected and/or the length of the vibration sensing optical cable 5.
The power module 10 supplies power to the components requiring power, such as the laser 1, the pulse modulator 2, the optical scanning device 4, the photodetector 8, and the signal acquisition and processing module 9.
A plurality of (n) vibration sensing optical cables 5 are connected in parallel to the optical scanning device 4, and an attenuator 7 is connected to the end (front end in the laser advancing direction) of each vibration sensing optical cable 5. The attenuator 7 may attenuate the advancing laser light, thereby preventing or reducing the noise that the reflected laser light forms as scattered light signals.
Each vibration sensing cable 5 may be connected to a plurality m of bearings. Thus, the monitoring system of the present invention can monitor the condition of m × n bearings. Of course, the number of bearings 6 connected (monitored) to each vibration sensing cable 5 may also be different.
As shown in fig. 2, the optical scanning device 4 includes two plane mirrors 401A and 401B, a fixed plate 402, a motor 403, and a plurality of (n or more) laser couplers 404A, 404B, 404C, and … …. The reflection surfaces of the two plane mirrors 401A and 401B are arranged in parallel with each other so as to face each other. The reflection surfaces of the two plane mirrors 401A and 401B are opposed to each other. The end faces of the two plane mirrors 401A and 401B are not on the same plane. Two plane mirrors 401A and 401B are mounted on a fixed plate 402 with their centers of symmetry coinciding with the center of the fixed plate 402. The fixed plate 402 is mounted on the spindle of a motor 403, and the axis of the spindle of the motor 403 coincides with the axis of the fixed plate and passes through the centers of symmetry of the two plane mirrors 401A and 401B. The laser couplers 404A, 404B, 404C, … … are connected to a vibration sensing optical cable 5, respectively.
Fig. 3 shows the operation principle of the optical scanning device 4, and the laser light (incident laser light 101) from the circulator 3 is incident in a fixed direction, and the sum of the outgoing laser light 102 reflected by the two plane mirrors 401A and 401B is parallel to the incident laser light 101 and enters the laser coupler 404A and the vibration sensing optical cable 5 connected thereto. When the motor 403 drives the plane mirrors 401A and 401B to rotate around their centers of symmetry 405, i.e., the plane mirrors are rotated from the positions 401A and 401B shown by the solid lines to the positions 401A ' and 401B ' shown by the broken lines, the outgoing laser light 102 ' is shifted in parallel from the outgoing laser light 102 before rotation and enters the laser coupler 404B and the vibration sensing optical cable 5 connected thereto. A plurality of couplers 404A, 404B, 404C, … … arranged in a plane perpendicular to the exiting laser light couple the laser light in free space into the vibration sensing cable 5.
The optical scanning device 4 is in the form of one-path input and multi-path parallel output, and the number of output paths can range from 4 to 64. The optical scanning device 4 is configured to time-divisionally input the incident laser light 101 from the circulator 3 to the plurality of vibration sensing optical cables 5. The optical scanning device 4 may be configured to cyclically input the incident laser light 101 from the circulator 3 to the plurality of vibration sensing optical cables 5 (the plurality of laser couplers 404A, 404B, 404C, … …) in sequence. The optical scanning device 4 can also selectively input the incident laser light 101 from the circulator 3 to a specific vibration sensing optical cable 5 according to the control of the signal acquisition and processing module 9.
It should be understood that the above-mentioned "the incident laser light 101 is input to the plurality of vibration sensing optical cables 5 in time division" merely means that laser light is input to only one vibration sensing optical cable 5 at the same time, and laser light may be input to different vibration sensing optical cables 5 at different times. This does not mean that the laser light must be input to all the vibration sensing optical cables 5 sequentially or cyclically, nor that the times of inputting the laser light to the plurality of vibration sensing optical cables 5 must be equal to each other. At a certain point or period of time, laser light may not be input to any vibration sensing optical cable 5. The operation of the optical scanning device 4 can be suitably controlled by the signal acquisition and processing module 9.
The configuration of the optical scanning device of the present invention is not limited to the above configuration. The number of mirrors may also be one or more. The number of motors may also be one or more. The motor may rotate or move one or more of the mirrors, and the motor may also rotate or move some of the mirrors. The motor may also move multiple laser couplers simultaneously or move a selected one of the laser couplers to a position to receive incident laser light. Also, the two mirrors do not have to be arranged in parallel.
As shown in fig. 4, the vibration sensing optical cable 5 is divided into two different structural parts according to different functions, the transmission part 501 is a solid structure in which a fiber core (also called a bare fiber) 503 is surrounded by a protective sheath 504 and a cladding 505, and the sensing part 502 is a hollow structure, that is, the fiber core 503 is suspended in the protective sheath 504, and the cladding 505 is not provided between the protective sheath 504 and the fiber core 503.
The transmission sections 501 and the sensing sections 502 are alternately arranged in the length direction of the vibration sensing optical cable 5. The sensing portion 502 is for mounting to a bearing to sense vibration of the bearing. The transmitting portion 501 serves to transmit laser light and backward traveling scattered light. The sensing portion 502 is more suitable for sensing vibrations than the transmitting portion 501. Of course, laser light and scattered light can also be transmitted in the sensing section 502.
It should be understood that mounting of sensing portion 502 to the bearing encompasses mounting of sensing portion 502 to either the inner race or the outer race of the bearing, but this is not readily achievable in many cases. Thus, the mounting of the sensing portion 502 to the bearing also encompasses the mounting of the sensing portion 502 to other components that contact the bearing to receive vibrations of the bearing (e.g., the end caps of the bearing mentioned below).
As shown in fig. 5, the vibration sensing cable 5 may be mounted to an end cap 601 of the bearing 6. The end cover 601 includes an annular plate 602 and a flange 603 projecting from the inner periphery of the annular plate 602 toward one side in the axial direction. The flange 603 is provided with a circumferential groove 604. The sensing portion 502 of the vibration sensing cable 5 is freely wound in a circumferential groove 604 in a flange 603 of the end cap 601. The non-vibration-sensing transmission portion 501 of the vibration-sensing optical cable 5 is fixed.
When the end cap 601 is mounted to the bearing 6, the flange 603 abuts against the outer race of the bearing 6 to receive the vibrations of the bearing. The annular plate 602 may be received in a bearing seat.
The on-line monitoring system for the bearing state based on the optical fiber vibration sensing of the invention is characterized in that a host machine except the vibration sensing optical cable 5 is placed in the approximate middle or central position of a plurality of bearings to be monitored, so that the number of the bearings to be monitored is increased.
The on-line bearing state monitoring system based on optical fiber vibration sensing can further comprise a bearing failure mode database (such as a voiceprint database). In this way, the signal acquisition and processing module 9 can compare the obtained scattered light signals with the data in the bearing failure mode database to determine the working state and/or failure type of the bearing. Thus, the monitoring system of the present invention may be referred to as an "intelligent" bearing condition on-line monitoring system.
In the optical fiber vibration sensing-based bearing state online monitoring system, the invention provides a technical scheme for improving the number of monitoring bearings by improving the sensitivity of the optical fiber vibration monitoring device and reducing energy loss through a specially designed vibration sensing optical cable, an installation method thereof, a layout mode of functional devices and an optical scanning device so as to realize online monitoring of a plurality of bearings by one set of system. The technical scheme can greatly reduce the system cost and improve the feasibility of realizing large-scale application of the bearing on-line monitoring system on equipment such as high-speed trains, wind turbine generators, a plurality of machine tools and the like.
The invention also provides an optical fiber vibration sensing-based bearing state online monitoring method based on the monitoring system.
It should be understood that the above embodiments are only exemplary and are not intended to limit the present invention. Various modifications and alterations of the above-described embodiments may be made by those skilled in the art in light of the teachings of the present invention without departing from the scope thereof.
Claims (8)
1. An on-line monitoring system for the bearing state based on optical fiber vibration sensing comprises a laser generator, a circulator, an optical scanner, multiple vibration sensing optical cables, a photoelectric detector, and a signal acquisition and processing module,
the laser generating device is used for emitting pulse laser,
the pulse laser generated by the laser generating device enters the optical scanning device through the circulator,
the optical scanning device is used for inputting the pulse laser to the plurality of vibration sensing optical cables in a time division manner,
each vibration sensing optical cable of the vibration sensing optical cables is used for sensing the vibration of one or more bearings, scattered light signals with bearing vibration information transmitted from the vibration sensing optical cables enter the photoelectric detector through the optical scanning device and the circulator,
the photoelectric detector is used for converting the scattered light signals into electric signals and transmitting the electric signals to the signal acquisition and processing module,
the signal acquisition and processing module is used for processing the electric signal transmitted from the photoelectric detector and determining the working state of the bearing according to the electric signal,
the vibration sensing optical cable comprises a sensing part and a transmission part, wherein the transmission part is a solid structure of which a fiber core is wrapped by a protective sleeve and a cladding, the sensing part is a hollow structure of which the fiber core is suspended in the protective sleeve, the transmission part and the sensing part are alternately arranged in the length direction of the vibration sensing optical cable,
the sensing part is used for being mounted on a bearing to sense vibration of the bearing, and the transmitting part is used for transmitting the pulse laser and the scattered light.
2. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 1,
the laser generating device comprises a laser and a pulse modulator,
the laser generated by the laser is modulated by the pulse modulator and then enters the optical scanning device through the circulator.
3. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 1,
the tail ends of the vibration sensing optical cables, which are far away from the optical scanning device, are connected with attenuators, and the attenuators are used for attenuating the pulse laser transmitted in the vibration sensing optical cables.
4. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 1,
the monitoring system further comprises a bearing fault mode database, and the signal acquisition and processing module compares the electric signals obtained by the signal acquisition and processing module with data in the bearing fault mode database to determine the working state and/or failure type of the bearing.
5. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 1,
the optical scanning device comprises a reflector, a motor and a plurality of laser couplers,
the pulse laser from the circulator is incident to the reflecting mirror, the motor moves the reflecting mirror to reflect the pulse laser to a selected laser coupler in the plurality of laser couplers, and the plurality of laser couplers are respectively connected with the plurality of vibration sensing optical cables, so that the pulse laser is incident to the corresponding vibration sensing optical cable.
6. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 5,
the optical scanning device comprises two parallel reflectors and a fixing plate, wherein the two parallel reflectors are arranged on the fixing plate, the fixing plate is arranged on a main shaft of the motor, the end faces of the two parallel reflectors are not on the same plane, and the symmetrical centers of the two parallel reflectors are arranged on the main shaft axis of the motor.
7. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to claim 1,
the sensing portion of the vibration sensing cable is wound in a circumferential groove of a flange of an end cap at the shaft end, the transmission portion of the vibration sensing cable is fixed,
the flange of the end cap of the bearing abuts against the outer ring of the bearing to receive the vibration of the bearing.
8. The on-line bearing condition monitoring system based on optical fiber vibration sensing according to any one of claims 1 to 7,
the portion of the monitoring system outside of the vibration sensing cable is placed in an intermediate position with respect to the plurality of bearings to be monitored.
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| CN201710032443.2A CN108318248B (en) | 2017-01-16 | 2017-01-16 | Optical fiber vibration sensing-based bearing state online monitoring system |
| PCT/CN2018/072604 WO2018130217A1 (en) | 2017-01-16 | 2018-01-15 | Bearing status online monitoring system and method based on optical fiber vibration sensing |
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| CN201710032443.2A CN108318248B (en) | 2017-01-16 | 2017-01-16 | Optical fiber vibration sensing-based bearing state online monitoring system |
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| CN110867195B (en) * | 2019-11-20 | 2023-12-12 | 四川赛康智能科技股份有限公司 | Online defect monitoring method for electric main equipment based on voiceprint and vibration |
| CN112459972A (en) * | 2020-12-01 | 2021-03-09 | 新疆大学 | Wind driven generator main bearing state monitoring device and monitoring method thereof |
| CN113654788B (en) * | 2021-09-18 | 2023-09-08 | 西华师范大学 | Optical fiber sensing system for online monitoring of rotating shaft state |
| CN114199289A (en) * | 2021-10-29 | 2022-03-18 | 国网天津市电力公司 | System and method for monitoring high-voltage equipment on-line sensor in transformer substation |
| CN115882937B (en) * | 2022-11-30 | 2024-01-09 | 江苏亮点光电研究有限公司 | Optical time domain reflection-based optical fiber laser state online monitoring light path and method |
| CN116398379B (en) * | 2023-04-18 | 2024-05-14 | 中国长江三峡集团有限公司 | Wind turbine generator blade state monitoring device and method based on distributed optical fiber sensing |
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| CN105122025A (en) * | 2012-12-14 | 2015-12-02 | Skf公司 | Fibre sensor assembly |
| CN104198030A (en) * | 2014-08-29 | 2014-12-10 | 中国石油天然气股份有限公司 | Multi-channel vibration detection method based on coherent Rayleigh scattering and detection system thereof |
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| CN104567958A (en) * | 2015-01-05 | 2015-04-29 | 华中科技大学 | Distributed micro-structure sensor network based on time division and wavelength division multiplexing and using method thereof |
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| CN108318248A (en) | 2018-07-24 |
| WO2018130217A1 (en) | 2018-07-19 |
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