Fiber-bragg-grating-based resonant train bearing damage detection sensor

A fiber grating and bearing damage technology is applied in the field of generalized resonance demodulation technology and optical fiber sensing technology.

Active Publication Date: 2018-10-02
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also many applications for fiber grating bearing detection. The fiber grating is directly connected to the mass block, and the fiber grating is strained by the up and down vibration of the vibrator. The sensor can perform temperature self-compensation and has high measurement sensitivity and resolution. However, the fiber Gratings are poorly protected and easily damaged

Method used

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  • Fiber-bragg-grating-based resonant train bearing damage detection sensor
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  • Fiber-bragg-grating-based resonant train bearing damage detection sensor

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specific Embodiment approach 1

[0023] Specific implementation mode one: combine Figure 1 to Figure 5 Describe this embodiment, the fiber grating-based resonant train bearing damage detection sensor described in this embodiment includes a fiber grating 1, a mass block 3, a variant 4, a bolt 5, a protective shell 6, a mounting base 7 and a fiber grating temperature sensor 8;

[0024] The protective shell 6 is a cavity structure with the top end closed and the bottom end open;

[0025] The opening end of the installation base 7 and the protective shell 6 is connected by threads; the center of the installation base 7 is provided with a vertical installation through hole;

[0026] The mass block 3 and the cis-variant 4 are simultaneously arranged inside the cavity structure of the protective shell 6, and the mass block 3 is located on the top of the cis-variant 4;

[0027] The bolt 5 is provided with an axial center through hole, and the bolt 5 passes through the mass block 3 and the variant body 4 from top t...

specific Embodiment approach 2

[0039] Embodiment 2: This embodiment is to further limit the fiber grating-based resonant train bearing damage detection sensor described in Embodiment 1. In this embodiment, an optical fiber protection part 2 is also included;

[0040]The top end of the protective shell 6 is provided with a threading hole with an internal thread, and the optical fiber protection part 2 and the protective shell 6 are connected to the threading hole by threads, and the fiber grating 1 extends out of the protective shell 6 from the central through hole of the optical fiber protection part 2 of the exterior.

[0041] In this embodiment, the fiber protection member 2 is used to fix the protruding part of the fiber Bragg grating 1 to prevent the fiber Bragg grating 1 from being damaged.

specific Embodiment approach 3

[0042] Specific embodiment three: this embodiment further limits the fiber grating-based resonant train bearing damage detection sensor described in specific embodiment one. In this embodiment, the end of the bolt 5 is installed through the screw thread and the mounting base 7 through-hole connection.

[0043] In this embodiment, the connection method is simple and reliable through screw connection.

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Abstract

The invention relates to the fields of the generalized resonance demodulation technique and the optical fiber sensing technoology, provides a fiber-bragg-grating-based resonant train bearing damage detection sensor so that a problem that key parameters like the real-time temperature, vibration frequency, and accelerated speed of the train bearing need to be analyzed in the early warning online monitoring application for train bearing damages can be solved. On the basis of impact excitation generated by early-stage damages of a bearing structure, a mechanical structure formed by a mass block, acompliant body and a bolt generate resonance, the peak wavelength of a solidified fiber sensing unit in the compliant body is in direct proportion to a system resonance amplitude, a maximum amplitudevalue is reached at a resonance frequency, so that resonance amplification detection is realized for a micro impact signal. Besides, a bearing temperature sensor is integrated into the sensor; and early-stage early warning monitoring of the damage of a train bearing is realized by fusion analysis of the temperature, vibration and impact resonance information. The sensor is suitable for online early warning monitoring of damages of various bearing type mechanical structures.

Description

technical field [0001] The invention relates to a generalized resonance demodulation technology and an optical fiber sensing technology. Background technique [0002] With the rapid development of China's railways, safety is the prerequisite for the rapid development of railways, and early detection of bearing damage is the top priority. The early detection of bearing faults is different from the fixed machinery detection in the laboratory, and the harsh environment of the railway places higher requirements on the sensors. The early fault damage of the bearing is a weak periodic signal, which is difficult to monitor with general vibration sensors. [0003] Fiber Bragg grating (FBG) has been paid more and more attention because of its high sensitivity, light weight, small size, low cost, anti-electromagnetic interference, anti-corrosion and other characteristics. Utilizing the excellent characteristics of fiber Bragg gratings for absolute encoding of wavelengths, accurate m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00G01K11/32G01D21/02
CPCG01D21/02G01H9/004G01K11/32
Inventor 吕国辉姜亚丽赵居上王朝钲姜旭
Owner HEILONGJIANG UNIV
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