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Flange bolt looseness detection method 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: 2020-07-14
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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  • Flange bolt looseness detection method based on electromechanical impedance
  • Flange bolt looseness detection method based on electromechanical impedance
  • Flange bolt looseness detection method 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 rest of the bolts loose.

[0035] 22. Define the bolts distributed on the l...

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Abstract

The invention discloses a flange bolt looseness detection method based on electromechanical impedance. The flange bolt looseness detection method comprises the following steps of patch mounting and connection, detection frequency band searching, damage state calibration, actual damage curve acquisition and data analysis. The bolt looseness state is identified by monitoring the change of the impedance value of the piezoelectric patch due to the facts that the bolt looseness can cause reduction of the structural connection rigidity and the electromechanical impedance value is influenced by the structural rigidity of the area. A novel bolt looseness detection method is provided for the maintenance work of the flange structure.

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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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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