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An Ultrasonic Guided Wave Monitoring Method for Bolt Pretightening Torque Based on Improved Time Reversal Method

A technology of bolt pretightening force and time reversal, which is applied in force/torque/work measuring instruments, measuring torque/torsion force during tightening, measuring devices, etc. It can solve problems such as difficult to compare signal phase changes, and improve detection accuracy , the effect of large monitoring range

Active Publication Date: 2019-06-21
西北工业大学太仓三角研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional time reversal method is difficult to compare the phase changes of the signals because the timereversed reemitting signal (the timereversed reemitting signal) is different each time it is monitored.

Method used

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  • An Ultrasonic Guided Wave Monitoring Method for Bolt Pretightening Torque Based on Improved Time Reversal Method
  • An Ultrasonic Guided Wave Monitoring Method for Bolt Pretightening Torque Based on Improved Time Reversal Method
  • An Ultrasonic Guided Wave Monitoring Method for Bolt Pretightening Torque Based on Improved Time Reversal Method

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Embodiment Construction

[0034] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0035] Such as figure 2 As shown, the method consists of two parts:

[0036] Step 1: Create a reference database offline:

[0037] Step 1.1: Use 3MDP460 industrial adhesive to paste two pieces of PZT components on the connection structure, which are respectively used as actuators and sensors. See the location image 3; The size of PZT is 10mm×8mm×1mm, the model is P5H, and the manufacturer is Baoding Hongsheng Acoustic Electronic Equipment Co., Ltd. The two PZT elements are located on both sides of the bolt to be tested, respectively, 134mm and 30mm away from the center of the bolt, and the principal deformation directions of the center of the bolt and the two PZT elements are collinear. The 3MDP460 industrial adhesive layer is thin and uniform, the thickness of the adhesive layer is 0.04-0.06mm, and it is cured at a temperature of 50°C to 60°C for two hours....

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Abstract

The invention relates to a bolt pre-tension torque ultrasonic guided-wave monitoring method based on an improved time reversal method. The method improves a time reversal method, adopts a unique standard time reversed reemitting signal in the monitoring process, makes comparison of signal phases possible and improves monitoring range and accuracy of the bolt pre-tension torque.

Description

technical field [0001] The invention relates to structural health monitoring technology, in particular to a method for monitoring bolt pretightening torque based on ultrasonic guided waves. Background technique [0002] Bolted connections are widespread in the fields of mechanical, civil, energy and aerospace engineering. In order to ensure the safe service of engineering structures, it is an important prerequisite to ensure that the bolts are in normal working condition at all times. However, the external mechanical environment such as vibration and impact, as well as the stress relaxation of bolts during long-term service, may lead to a decrease in bolt preload torque and loose connections, seriously threatening structural safety. At present, the detection of bolt pretightening torque in engineering can be realized by traditional nondestructive testing technology, such as ultrasonic body wave method. However, non-destructive testing technology requires large-scale equipm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/24
CPCG01L5/246
Inventor 徐超吴冠男杜飞
Owner 西北工业大学太仓三角研究院