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A detection method for flange bolt looseness based on electromechanical impedance

A flange bolt, electromechanical impedance technology, applied in the field of non-destructive testing, can solve the problem of time-consuming and labor-intensive monitoring methods

Active Publication Date: 2021-05-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there is a bolt looseness detection method based on electromechanical impedance, it has obvious limitations, such as the need to attach piezoelectric ceramic sheets to each bolt. Such a monitoring method is time-consuming and laborious, so it is necessary to develop a new Flange bolt loose detection method

Method used

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  • A detection method for flange bolt looseness based on electromechanical impedance
  • A detection method for flange bolt looseness based on electromechanical impedance
  • A detection method for flange bolt looseness based on electromechanical impedance

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Embodiment Construction

[0028] The specific embodiment of the present invention will be further described below by taking a certain type of four-bolt transmission shaft connecting flange as an example.

[0029] Step 1, preparation work:

[0030] 11. Evenly install the piezoelectric ceramic sheet on the front of the connecting flange. The installation rule is to install on the flange surface in the middle of every two bolts. The installation method is glued.

[0031] 12. Place the flange evenly on a flat surface.

[0032] 13. Select one of the piezoceramics as the calibration piezoceramic in the next step, and connect the impedance analyzer to the piezoceramic.

[0033] Step 2, find the appropriate detection frequency band of the test piece to be tested:

[0034] 21. Define the two near-field bolts next to the calibrated piezoelectric ceramic sheet as near-field bolts. Tighten the two near-field bolts to 60N·m, and keep the other bolts loose.

[0035] 22. Define the bolts distributed on the left an...

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Abstract

The invention discloses a method for detecting flange bolt looseness based on electromechanical impedance, comprising the following steps: patching and connecting, searching for detection frequency bands, calibrating damage states, obtaining actual damage curves, and data analysis. The present invention utilizes that bolt looseness will cause structural connection rigidity to drop, and the electromechanical impedance value is affected by the structural rigidity of this region, so the loosening state of the bolt is identified by monitoring the change of the impedance value of the piezoelectric sheet. A new detection method for bolt looseness is provided for the inspection and maintenance of flange structures.

Description

technical field [0001] The invention relates to a non-destructive testing method, in particular to a non-destructive testing method based on electromechanical impedance for loosening of flange fastening bolts. Background technique [0002] Bolt connection has the characteristics of reliable connection and repeated use, so it is widely used in the connection of various mechanical structures, especially flange connection. However, during the use of bolts, they will be affected by environmental factors such as lateral vibration and temperature changes, which will cause the bolts to loosen, which will not only make the connection structure fail, but more seriously may cause safety accidents. Therefore, this research field has received the attention of many scholars. [0003] At present, there are mainly the following types of detection technologies for bolt looseness: (1) measurement methods based on vibration signals; (2) measurement methods based on vision; (3) measurement me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00G01R27/02
CPCG01M13/00G01R27/02
Inventor 孙清超王琳涛丁杰城袁博王新煦
Owner DALIAN UNIV OF TECH
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