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Short-base sensor for ship structure stress monitoring and using method thereof

A technology of structural stress and sensor, applied in the field of disaster prevention and monitoring of marine ships and stress sensor, can solve the problems of damage and destruction of hull structure, and achieve the effect of good specification, small structure, flexible debugging and maintenance

Pending Publication Date: 2020-04-28
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the face of such a complex and harsh natural environment as the ocean, ships are usually affected and eroded by various loads and factors, resulting in damage and destruction of the hull structure, which in turn leads to various serious accidents

Method used

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  • Short-base sensor for ship structure stress monitoring and using method thereof
  • Short-base sensor for ship structure stress monitoring and using method thereof
  • Short-base sensor for ship structure stress monitoring and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A short-base sensor used for stress monitoring of ship structures comprises: a connecting device, a fixing device, a sealing device and a stress-sensitive element.

[0042] The connecting device is composed of a connecting pipe 3 , an upper protective pipe 5 , a lower protective pipe 6 , and an optical fiber sticking bearing block 7 . There is a connecting tube 3 at both ends, and an optical fiber sticking bearing block 7 is placed in it. The two connecting tubes 3 are connected by a protective tube, and the protective tube is fixedly connected by the upper protective tube 5 and the lower protective tube 6 through screw holes. The connecting parts of the pipes are all sealed with watertight grooves, and rubber sealing rings are inserted into the watertight grooves to ensure the watertightness of the connections.

[0043] The fixing device includes: a sensor fixing block 2 and a fixing screw hole 8 of the pasting block. Wherein the fixing screw holes 8 of the sticking b...

Embodiment 2

[0047] The short-base sensor for ship structure stress monitoring is characterized in that the sensor system includes: a connecting device, a fixing device, a sealing device and a stress sensitive element. The connection device consists of a connecting tube 3, an upper protection tube 5, a lower protection tube 6, and an optical fiber adhesive bearing block 7; the fixing device includes a sensor fixing block 2 and an adhesive block fixing screw hole 8; the sealing device includes an optical fiber waterproof aviation plug connection plate 1, The sealing plate 4, the optical fiber waterproof aviation socket 11 and the aviation insertion fixing hole 12, the connecting part is provided with a sealing port, and a multi-layer sealing ring is provided inside to play a watertight role and prevent the sensor from monitoring the stress due to water ingress.

[0048] Wherein the stress sensitive element is composed of a single fiber grating and a temperature compensation grating. The def...

Embodiment 3

[0050] Methods of use include:

[0051] (1) After the sensor is installed and the top wire of the fiber grating is connected to the demodulator through a waterproof aviation plug, if the hull part of the installation position is subjected to external force, the sensor will also be deformed accordingly, and it will be pasted on the bearing blocks at both ends The fiber between 8 will also be deformed, which will cause the wavelength of the fiber grating to change.

[0052] (2) The stress change of the ship hull is reflected on the demodulator through the change of the fiber grating wavelength, because the deformation of the fiber grating is basically in a linear relationship with the deformation of the fiber grating, so through the compensation algorithm of the demodulator, the stress change of the hull structure and The wavelength change of the fiber grating is also basically linearly proportional.

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Abstract

The invention discloses a short-base sensor for ship structure stress monitoring and a using method of the short-base sensor. The sensor mainly comprises a connecting device, a fixing device, a sealing device and a stress sensitive element. The two ends of an optical fiber are pasted on bearing blocks and are fixed in movable connecting pipes through fixing screw holes, and finally, the stress change of a ship body structure is reflected on a demodulator through the change of the wavelength of a fiber Bragg grating. The sensor is designed for a complex ship body structure of a ship and can beinstalled in a narrow space and part to measure the stress change of the ship body structure. Meanwhile, aiming at the harsh natural environment of the ocean, the sensor is designed to be of an overall watertight structure, an additional watertight shell is not needed, and the sealing performance, reliability and stability of the sensor in the ocean ship transportation process are improved.

Description

technical field [0001] The invention relates to a stress sensor applied to the local strength measurement of a hull, belongs to the technical field of optical fiber grating sensing, and relates to disaster prevention and monitoring of marine vessels. Background technique [0002] Among all kinds of means of transportation, ships have the advantages of large loading capacity and low cost. However, in the face of such a complex and harsh natural environment as the ocean, ships are usually affected and eroded by various loads and factors, resulting in damage and destruction of the hull structure, which in turn leads to various serious accidents. In the ever-changing marine environment, it is unreliable to rely solely on personal judgment of the hull condition, so real-time health monitoring of the hull structure is very necessary. [0003] Because the fiber grating uses wavelength encoding for the measured information, and the wavelength is an absolute parameter, it is not aff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/24
CPCG01L1/242
Inventor 王为刘传奇乔立波杨靖平
Owner TIANJIN NORMAL UNIVERSITY
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