Measuring Method of Transient Transient Transverse Friction Coefficient of Rolling Contact Point Based on Fiber Bragg Grating
A technology of optical fiber grating and rolling contact, which is applied in the direction of measuring devices, instruments, and mechanical devices, 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: 2019-07-23
WUHAN UNIV OF TECH
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to provide an optical fiber based Measuring method and device for transient lateral friction coefficient of rolling contact point of grating
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[0031] 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.
[0032] 1. Experimental principle
[0033] Fiber grating sensor is a new type of fiber sensor made by using the sensitivity of Bragg wavelength to temperature and strain. According to the fiber coupled mode theory, when broadband light is transmitted in a fiber grating, mode coupling will occur, and the light that meets the Bragg condition is reflected. The central reflection wavelength of the fiber Bragg grating (FBG) is:
[0034] λ B = 2n eff ·Λ (1)
[0035] Where n eff Is the effective refractive index of the guided mode, and Λ is the grating period.
[0036] When the wavelength satisfies the Br...
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The invention discloses a measurement method of a transient transverse friction coefficient of a rolling contact point based on optical fiber gratings. The measurement method comprises the following steps of symmetrically pasting the optical fiber gratings with different central wavelengths on the two sides of a big wheel, sequentially marking the optical fiber gratings, adjusting a certain normal force generated by the big wheel and a small wheel at the rolling contact point, forming a certain attack angle between the big wheel and the small wheel to allow the big wheel to generate a certain transverse force at the rolling contact point, controlling the rotating speed of the big wheel, transmitting a strain signal generated by the big wheel to the optical fiber gratings when the big wheel rotates, transmitting a built-in light source of a demodulator to the optical fiber gratings via an optical fiber grating rotary connector, allowing the optical fiber gratings to generate strain signals, demodulating the strain signals of the optical fiber gratings with the demodulator, transmitting demodulated signals to an industrial personnel computer, allowing the industrial personnel computer to acquire and analyze the demodulated signals, and calculating transient positive pressure and friction of the big wheel at the rolling contact point according to wavelength shift of the optical fiber gratings.
Description
Technical field [0001] The invention relates to the field of optical fiber grating sensing, in particular to a method and device for measuring the transient lateral friction coefficient of rolling contact points based on optical fiber grating. Background technique [0002] Fiber grating sensing technology is developed on the basis of fiber grating sensing technology. The basic principle of fiber grating sensing system is to connect multiple gratings (each with a different center wavelength) in series on a fiber, which is emitted by a broadband light source. The light wave passes through all gratings through the splitter, and the reflected light is coupled into the fiber grating demodulator through another interface of the splitter. The wavelength of the reflected light and its change are measured by the fiber grating demodulator, and the demodulation can be obtained. The data, after data analysis and processing, can obtain the corresponding changes in the environment of each fibe...
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IPC IPC(8): G01N19/02G01D21/02
CPCG01D21/02G01N19/02
Inventor 刘晓刚谭跃刚
Owner WUHAN UNIV OF TECH