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Fiber Bragg grating measuring method of deflection of travelling crane

A technology of grating measurement and optical fiber, which is applied in the direction of measuring device, elastic test, machine/structural component test, etc. It can solve the problems of wasting manpower, wrong observation results, time-consuming and labor-intensive measurement, etc.

Inactive Publication Date: 2010-03-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the level gauge method is a fixed-point measurement of the deflection, and the deflection cannot be monitored during the driving operation.
Moreover, the level method measurement is not only time-consuming and labor-intensive, but also a waste of manpower, and sometimes the observation result may be wrong due to the visual error of the observer.

Method used

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  • Fiber Bragg grating measuring method of deflection of travelling crane
  • Fiber Bragg grating measuring method of deflection of travelling crane
  • Fiber Bragg grating measuring method of deflection of travelling crane

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Embodiment Construction

[0035] The following embodiment is the example that the inventor adopts the optical fiber Bragg grating to measure the deflection of the vehicle in the laboratory, and is the example carried out by the inventor in the laboratory, and its experimental parameters are:

[0036] 1. Dimensions of the main beam of the vehicle: choose 10# I-beam with a length of 1m as the main beam of the vehicle, the span l=1000mm, the waist height (h) is 100mm, the leg width (t) is 68mm, and the waist thickness (d) is 4.5mm ;

[0037] 2. The main beam of the train, the material parameters are: the Young’s modulus of 45# steel is E=200GPa;

[0038] 3. The technical parameters of the fiber Bragg grating are: central wavelength λ B =1550.000nm, effective elastic-optic coefficient p e =0.22;

[0039] 4. Attached figure 1 For the configuration experiment, 5 measuring points are respectively set at 1 / 6, 2 / 6, 3 / 6, 4 / 6, and 5 / 6 from the left end of the main beam (2);

[0040] 5. Use a fiber grating an...

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Abstract

The invention provides a fiber Bragg grating (FBG) measuring method for deflection of a travelling crane, which comprises the following steps: taking the left end of a girder of the travelling crane as a starting point, arranging five measuring points respectively at the position one sixth, two sixths, three sixths, four sixths and five sixths away from the left end of a girder (2); arranging fiber Bragg gratings 5 respectively below each measuring point of the girder, utilizing fiber for connecting the fiber Bragg gratings 5 of all measuring points in series; and connecting the fiber Bragg gratings 5 optically with a signal processing device through input-output fiber 6. The measurement of the deflection of the travelling crane is converted to the measurement of central wave length displacement of the fiber Bragg grating, so that the real-time online monitoring is conducted on the girder of the travelling crane. The method can replace the current commonly used leveling instrument method for measurement, realize real-time measurement on the travelling crane, save time and effort, save manpower, and also can avoid visual error caused by human visual observation.

Description

Technical field [0001] The invention relates to a technique for measuring the deflection of a vehicle, in particular to an optical fiber Bragg grating measurement technique for the deflection of a vehicle, which belongs to the technical field of optoelectronic measurement. Background technique [0002] Crane is a commonly used hoisting equipment in industrial production. During the crane operation, when the load of the main girder of the crane is too large, the deflection of the main girder exceeds the standard (for single-girder bridge cranes, the allowable downward deflection refers to the elastic downward force generated when the crane is fully loaded. scratch F 允许 ≤ L x / 800,L x When the main girder span), the main girder body is damaged, and even cause the trolley to derail, leading to accidents. Therefore, it is necessary to monitor the deflection of the main girder during the use of the crane. The driving deflection measurement method is a measurement technology t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00G01B11/02
Inventor 李川黄代民
Owner KUNMING UNIV OF SCI & TECH
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