Calibration method for detecting pressure of bolted connection joint surfaces based on FBG sensors

A calibration method and sensor technology, which are applied in the measurement of fluid pressure, the measurement of fluid pressure by optical methods, and the measurement of force by measuring the change of optical properties of materials when they are stressed, which can solve the problems of cumbersome and difficult control of the calibration process.

Active Publication Date: 2019-01-11
DALIAN UNIV OF TECH
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Problems solved by technology

It solves the problem that the calibration process is cumbersome and difficult to control in the case of simultaneous detection of multi-point surface pressure at the joint surface or the comple

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  • Calibration method for detecting pressure of bolted connection joint surfaces based on FBG sensors
  • Calibration method for detecting pressure of bolted connection joint surfaces based on FBG sensors
  • Calibration method for detecting pressure of bolted connection joint surfaces based on FBG sensors

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[0031] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples. The described specific examples are only for explaining the present invention, and are not intended to limit the present invention.

[0032] The calibration principle of the present invention is as attached figure 1 As shown, based on the characteristics of fiber gratings and the principle of FBG sensors, the FBG sensor is embedded in the connected part: a reasonable embedding groove is opened on the surface of the connected part, and it is embedded in the connected part according to the fiber grating packaging process. It is used to measure the strain value at the joint surface of the connection; at the same time, it is combined with a thin-film pressure sensor and placed between the connected parts to measure the pressure value at the joint surface of the bolt connection. The two sensors feed back in real time u...

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Abstract

The invention belongs to the technical field of pressure detection of the joint surfaces of connected parts, and discloses a calibration method for detecting the pressure of the bolted connection joint surfaces based on FBG sensors. On the basis of using the method for detecting the pressure of the bolted fastening joint surfaces based on the FBG sensors, the set of complete calibration method isdesigned by combining with specific experimental parameters, and the calibration method comprises design of the equivalent annular connected parts, FBG sensor burying grooves in the connected parts and the whole calibration process. The problems that the calibration process is cumbersome and difficult to control under the conditions that the surface pressure at multiple points of the joint surfaces is detected simultaneously or the situation of the joint surfaces is complex are solved; and the calibration process is simpler, the calibration efficiency is greatly improved, and thus the method for detecting the pressure of the joint surfaces is applied more widely.

Description

technical field [0001] The invention belongs to the technical field of joint surface pressure detection of connectors, in particular to a calibration method for detecting the surface pressure of a bolt joint joint based on an FBG sensor. Background technique [0002] In the assembly of major engineering equipment parts and high-precision parts, bolted connections are often used, but it has been difficult to accurately control the bolt pretightening force and the pressure of the connection joint surface, the pressure control on the joint surface is inaccurate, and the pressure on the joint surface after installation Uneven distribution will seriously affect the stiffness of the connection and the overall performance of the equipment. In the assembly of major equipment, such as high-pressure and low-pressure turbine shafts in aero-engines, high-pressure compressor discs and drums, there are a large number of bolt connections, and the connections must be precisely controlled. T...

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Application Information

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IPC IPC(8): G01L1/24G01L11/02
CPCG01L1/246G01L11/025
Inventor 孙清超李小冬孟亮国袁博
Owner DALIAN UNIV OF TECH
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