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Bearing state online monitoring system and method based on optical fiber vibration sensing

A monitoring system, optical fiber vibration technology, applied in the direction of mechanical bearing testing, etc., can solve the problems of increasing system cost, laser loss, etc., to achieve good sensitivity, reduce power, and reduce costs

Active Publication Date: 2018-07-24
SCHAEFFLER TECH AG & CO KG
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AI Technical Summary

Problems solved by technology

At the same time, the laser will also lose in the process of optical fiber transmission.
The current solution to increase the detection distance by using high-power lasers and optical power amplifiers greatly increases the system cost

Method used

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  • Bearing state online monitoring system and method based on optical fiber vibration sensing
  • Bearing state online monitoring system and method based on optical fiber vibration sensing
  • Bearing state online monitoring system and method based on optical fiber vibration sensing

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Embodiment Construction

[0038] refer to figure 1 , an on-line monitoring system for bearing status based on optical fiber vibration sensing (hereinafter, sometimes simply referred to 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 , attenuator 7 , photodetector 8 , signal acquisition and processing module 9 and power module 10 .

[0039] After the laser light produced by the laser 1 is modulated into pulsed laser light by the pulse modulator 2, it enters a vibration sensing optical cable 5 among a plurality of (n) vibration sensing optical cables 5 through a circulator 3 and an optical scanning device 4 to detect multiple ( m) the vibration of the bearing 6 under working conditions. The vibration of the bearing 6 will cause the stress of the optical fiber in the vibration sensing optical cable 5 to change, thereby causing the corresponding change of t...

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Abstract

The invention provides a bearing state online monitoring system and method based on optical fiber vibration sensing. A laser generating device is used for emitting pulse laser to a circulator. An optical scanning device is used for inputting the pulse laser coming from the circulator to multiple vibration sensing optical cables in a time division manner. Each of the vibration sensing optical cables is used for sensing the vibration of one or more bearings. Scattered optical signals which are transmitted from the vibration sensing optical cables and carry bearing vibration information are inputto a photoelectric detector via the optical scanning device and the circulator. The photoelectric detector converts the scattered optical signals into electrical signals, and transmits the electricalsignals to a signal collecting and processing module. The signal collecting and processing module is used for processing the electrical signals and determining the working states of the bearings according to the electrical signals. The vibration sensing optical cables are connected in parallel. The length of each vibration sensing optical cable can be shortened, the sensitivity of the monitoringsystem can be improved, and the cost of the monitoring system can be lowered.

Description

technical field [0001] The invention belongs to the technical field of on-line monitoring of bearing status, in particular to a system and method for on-line monitoring of intelligent bearing status based on optical fiber vibration sensing. The system and method can realize the status monitoring of a large number of bearings at low cost. Background technique [0002] The online monitoring system of bearing status based on temperature sensing can detect abnormal conditions by monitoring the change of bearing operating temperature, because when the bearing fails, its wear and tear will accelerate rapidly, and the operating temperature will increase accordingly. [0003] Thanks to the amplitude-frequency characteristics of vibration signals detected by vibration sensors such as accelerometers, the online monitoring system of bearing status based on vibration sensing can not only detect abnormal conditions but also effectively determine the type of failure. By comparing the feat...

Claims

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Application Information

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IPC IPC(8): G01M13/04
CPCG01M13/04
Inventor 关冉
Owner SCHAEFFLER TECH AG & CO KG
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