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Device and method for measuring transient sliding friction coefficient based on fiber grating

A technology of sliding friction coefficient and optical fiber grating, which is applied in the direction of measuring devices, mechanical devices, instruments, etc., can solve the problems of inability to achieve accurate measurement, inability to distinguish the change of Bragg wavelength, etc., and achieve the effect of solving cross-sensitivity problems

Active Publication Date: 2017-01-25
WUHAN UNIV OF TECH
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a dual-wavelength fiber Bragg grating matrix based Measuring device and method for transient sliding friction coefficient based on optical fiber grating algorithm

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  • Device and method for measuring transient sliding friction coefficient based on fiber grating
  • Device and method for measuring transient sliding friction coefficient based on fiber grating
  • Device and method for measuring transient sliding friction coefficient based on fiber grating

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Embodiment Construction

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0041] The present invention draws on the double grating method and adopts the symmetrical arrangement of two fiber gratings on the front and back of the element to eliminate the influence of temperature. When the temperature rises, their temperature rises at the same time. When the element is stressed, the grating is in front and back. , So a grating is stretched, the center wavelength increases, and a grating is compressed center wavelength decreases.

[0042] Δλ B =K T ·ΔT+K ε ·Δε (1-3)

[0043] Using formula 1-3, the two fiber gratings pasted in the same temperature environment are affected b...

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Abstract

The invention provides a device and a method for measuring a transient sliding friction coefficient based on fiber gratings. The device comprises a small wheel assembling mechanism, a large wheel assembling mechanism, a demodulator and an industrial personal computer; fiber gratings are respectively and symmetrically arranged on front and back surfaces of two supports on the two sides of a small wheel and front and rear sides of a steering wheel; an incidence angle regulator is further installed on a supporting plate; a central plane of a large wheel of the large wheel assembling mechanism and a central plate of the small wheel are on the plane, and wheel sides are tangent; a light source built in the demodulator is transmitted to each of the fiber gratings through a rotary connector, contact points between the large wheel and the small wheel produce a friction force with the rotation of the large wheel, the friction force is transmitted to each of the fiber gratings and the fiber gratings generate strain signals; the demodulator demodulates the strain signals of the fiber gratings and sends demodulated signals to the industrial personal computer; the industrial personal computer receives the demodulator signals, performs acquisition and analysis, calculates transient positive pressure and friction force of the small wheel according to the wavelength shift of the fiber gratings, and calculates a transient transverse friction coefficient at the contact points through a corresponding formula.

Description

Technical field [0001] The invention relates to the field of optical fiber grating sensing, in particular to a measuring device and method for transient sliding friction coefficient based on optical fiber grating sensing technology. Background technique [0002] Fiber grating (FBG) is formed by changing the refractive index of the fiber core region to produce small periodic modulation, and the refractive index change is usually between 10-5 and 10-3 [0003] The calculation formula for the center wavelength of FBG is as 1-1: [0004] λ B = 2n eff ·Λ (1-1) [0005] In formula 1-1, n eff Is the refractive index of FBG. Λ is the grating pitch. The coupled mode theory shows that FBG only reflects light that meets the conditions. Differentiate it to get: [0006] Δλ B = 2n eff ·ΔΛ+2·Δn eff ·Λ (1-2) [0007] From 1-2, when n eff Or when Λ changes, the center wavelength will change. When the environment of the grating changes, n eff Or Λ will change accordingly. By detecting the change of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/02
CPCG01N19/02
Inventor 刘晓刚
Owner WUHAN UNIV OF TECH
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