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Cable stress measuring device based on fiber grating sensing technology

A fiber grating and stress measurement technology, applied in the direction of measuring devices, tension measurement, force measurement, etc., can solve the problems of large measurement results, uncertain relationship between cable force, inconvenient installation, etc., and achieve good electrical insulation performance, small transmission loss, The effect of easy disassembly and assembly

Inactive Publication Date: 2015-11-11
KUNSHAN CONSTRUCT ENG QUALITY TESTING CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The frequency method has many shortcomings. When using this method to test the cable force, we usually define the two ends of the cable as hinged supports or fixed supports. However, in the case of multi-point elastic support boundaries, The relationship between the magnitude of the cable force and the frequency is uncertain
At the same time, there are still some difficulties in picking and determining the self-vibration frequency of the cable.
[0004] The oil pressure gauge reading method is only suitable for measuring the active cable force of the structure during the construction process, and cannot measure the cable force that has been stretched or the internal force of the cable that passively generates tension.
[0005] In the pressure sensor method, the load sensor is generally used, which also has many shortcomings. The volume and mass of the load sensor are large, which leads to inconvenient installation; when measuring the stress data of the cable body, it is difficult to repair the damaged load sensor; at the same time, the load sensor The price is very high and the maintenance cost is also high, so it is difficult to be widely used in engineering
[0006] The disadvantage of the three-point measurement method for measuring the cable force is that the cable is assumed to be "completely flexible" during the measurement process, but in practice, this also needs to consider the bending resistance of the cable interface, otherwise the measurement result will be too large , leading to inaccurate measurements

Method used

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  • Cable stress measuring device based on fiber grating sensing technology
  • Cable stress measuring device based on fiber grating sensing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] refer to figure 1 and figure 2 As shown, a cable body stress measurement device based on fiber grating sensing technology includes a positioning base plate 1, and two clamping parts 2 are arranged symmetrically on the surface of the positioning base plate. Clamping block 22 and upper pressing block 23, both ends of the lower clamping block are provided with threaded through holes 24 that run through the surface and bottom of the lower clamping block, the positioning base plate is locked with the threaded through hole by the first screw 11, and the lower clamping block There is a first arc-shaped groove 211 in the middle of the surface, and a second arc-shaped groove 221 symmetrical to the first arc-shaped groove 211 is arranged in the middle of the bottom of the upper clamping block. The first arc-shaped groove matches the second arc-shaped groove. The groove clamps the cable body, and the two ends of the upper clamping block are locked with the threaded through hole ...

Embodiment 2

[0034] The difference between embodiment two and embodiment one is that the fiber grating sensor is a bidirectional strain fiber grating sensor, and the strain measurement range of the fiber grating sensor is -2000με—+3000με. After using the bidirectional strain fiber grating sensor, the cable structure that has been in operation can be Whether the cable force is increased (expressed as positive strain) or decreased (expressed as negative strain) under the action of external factors, the data can be transmitted to the data through the bidirectional strain fiber grating sensor In the collector, it can be used in a wide range.

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Abstract

The invention discloses a cable stress measuring device based on the fiber grating sensing technology. The device comprises a positioning base plate, two clamping portions are symmetrically arranged at the surface of the positioning base plate, each clamping portion comprises a lower clamping block, an upper clamping block and an upper pressing block which are successively stacked, the two ends of the lower clamping block are respectively provided with threaded through holes which penetrate the surface and bottom of the low clamping block, the positioning base plate is locked to the threaded through holes via first screws, the middle of the surface of the lower clamping block is provided with a first arched groove, the middle of the upper clamping block is provided with a second arched groove which is symmetrical with the first arched groove, the first arched groove cooperates with the second arched groove to clamp a cable, the two clamping portions are respectively arranged at the two ends of a fiber grating sensor in a clamping manner, the upper pressing block fixes the end portions of the fiber grating sensor at the surface of the upper pressing block via third screws, and the fiber grating sensor is connected with a data collector. The cable stress measuring device has the advantages of being convenient to install, resistant to electromagnetism, low in weight, high in electric insulation performance, resistant to corrosion, low in transmission loss and the like.

Description

technical field [0001] The invention relates to the field of detection devices, in particular to a cable body stress measurement device based on fiber grating sensing technology. Background technique [0002] At present, the commonly used cable force measurement methods in engineering include: vibration frequency method, oil pressure gauge reading method, pressure sensor method and three-point bending method. [0003] The frequency method has many shortcomings. When using this method to test the cable force, we usually define the two ends of the cable as hinged supports or fixed supports. However, in the case of multi-point elastic support boundaries, The relationship between the magnitude of the cable force and the frequency is uncertain. At the same time, there are still some difficulties in picking up and determining the self-vibration frequency of the cable. [0004] The oil pressure gauge reading method is only suitable for measuring the active cable force of the stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/25G01L5/04
Inventor 顾盛杨振吴玉龙蔡俊华
Owner KUNSHAN CONSTRUCT ENG QUALITY TESTING CENT
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