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Fiber Bragg rating measurement method for deformation of duckbill-type cross arm primary sheets

A grating measurement, duckbill technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as inability to realize real-time online monitoring, complex cross-arm force, and inability to reflect the health status of the cross-arm.

Inactive Publication Date: 2010-08-04
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the force of the cross-arm is very complicated, the stress-strain of the cross-arm is not completely corresponding to the inclination angle, so this technology cannot reflect the health status of the cross-arm, let alone realize real-time online monitoring

Method used

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  • Fiber Bragg rating measurement method for deformation of duckbill-type cross arm primary sheets
  • Fiber Bragg rating measurement method for deformation of duckbill-type cross arm primary sheets
  • Fiber Bragg rating measurement method for deformation of duckbill-type cross arm primary sheets

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Experimental program
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Effect test

Embodiment Construction

[0041] 1. Cross-arm size: choose Q235 steel as the main material of the cross-arm, and the length of the main material of the lower plane is l 1 =1500mm, the length of the main material on the upper plane Cross-arm height h=250mm, cross-arm width b=125mm, cross-sectional area A=375mm 2 , the vertical distance from the hanging point to the hanging point e=500mm

[0042] 2. The material parameters of the cross arm are: Young’s modulus of Q235 steel is E=206GPa

[0043] 3. The technical parameters of the fiber Bragg grating are: central wavelength λ 1 =1547.000nm,λ 2 =1550.000nm,λ 3 =1553.000nm,λ 4 =1556.000nm, effective elastic-optic coefficient p e =0.22

[0044] 4. Attached figure 1 Configure experiment

[0045] 5. Obtain the central wavelength of the fiber Bragg grating with a fiber grating analyzer

[0046] 6. Substituting the known quantity into formula (11), the relationship between the force on the main material of the cross-arm and the shift of the center wave...

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Abstract

The invention belongs to the technical field of electronic measurement and relates to a method for measuring stress-strain of a cross arm of a power tower, in particular to a method for measuring the deformation of duckbill-type cross arm primary sheets. The method of the invention comprises the following steps: attaching the fiber Bragg grating to the primary materials of the cross arm; converting the linear strain of each primary sheet of the cross arm into a wavelength displacement of the fiber Bragg grating; connecting the fiber Bragg grating with a signal processor; and computing the displacement of the central wavelength of the fiber Bragg grating by means of the demodulator of the signal processor. The measurement method of the invention has the advantages of accuracy and reliability and can reflect the complex stress situations of the cross arm and realize real-time on-line monitoring.

Description

technical field [0001] The patent of the present invention specifically relates to a method for measuring stress and strain of a cross-arm of a power tower, in particular a method for measuring the force-deformation of a main material of a duckbill-type cross-arm, which belongs to the technical field of optoelectronic measurement. Background technique [0002] The cross arm is the angle iron fixed horizontally on the top of the iron tower, utility pole, etc. The steel structure is usually made into a plane truss type, fixed on the main tower and the main pole with nails, and a flexible suspender is added to reduce the tension of the cross arm on the wire hanging wire. loads borne. The main function of the cross arm is to install insulators and metal components to support wires and lightning conductors and keep them at a certain safe distance according to regulations. Due to the unfavorable factors of natural disasters such as icing, the stress of the cross-arm will increase...

Claims

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Application Information

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IPC IPC(8): G01B11/16
Inventor 李川于亚红王达达李建发
Owner KUNMING UNIV OF SCI & TECH
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