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Real-time high-precision detection method and system for bolt pre-tightening force based on piezoelectric ultrasonic wafer

A bolt pretightening force, piezoelectric ultrasonic technology, applied in force/torque/work measuring instruments, force sensors related to bearings, measuring torque/torsion force during tightening, etc., can solve problems such as high cost and achieve low cost , Eliminate errors and improve repeatability

Active Publication Date: 2018-08-10
DALIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of existing pretightening force detection methods and overcoming the errors and high costs brought by ultrasonic probes, the present invention provides a real-time high-precision detection method and system for bolt pretightening force based on piezoelectric ultrasonic chips

Method used

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  • Real-time high-precision detection method and system for bolt pre-tightening force based on piezoelectric ultrasonic wafer
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  • Real-time high-precision detection method and system for bolt pre-tightening force based on piezoelectric ultrasonic wafer

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0035] A method for real-time and high-precision detection of bolt pretightening force based on piezoelectric ultrasonic chips, the steps are as follows:

[0036] 1. Preload test model based on single-wave flight time difference

[0037] By detecting the time-of-flight difference (the time difference between the first wave of the first reflected wave and the first wave of the second reflected wave), the service condition of the preload is characterized.

[0038] In the case of plane waves in homogeneous and isotropic materials, the velocity of the longitudinal wave is in the same direction as the applied stress and can be expressed in their first-order approximation as

[0039] V L =V 0 (1+A L σ)

[0040] Among them, V L is the propagation velocity of the longitudinal wave under the stress state, V 0...

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Abstract

The invention discloses a real-time high-precision detection method and system for a bolt pre-tightening force based on a piezoelectric ultrasonic wafer. The piezoelectric ultrasonic chip is used as an ultrasonic excitation source to be attached to a bolt head, and a high-precision fitting relationship between an ultrasonic flight time difference and the bolt pre-tightening force is established byusing the change law of an ultrasonic single-wave time difference with the stress value; and real-time detection of the bolt pre-tightening force is achieved by using the mathematical relationship. Compared with the prior method using the ultrasonic probe, the method provided by the invention eliminates the error caused by the uncertainty of the thickness of the coupling agent, and further improves the measurement accuracy by using the single-wave time difference. Low-error-rate measurement of the bolt pre-tightening force is achieved at low cost and without influencing the structural performance.

Description

technical field [0001] The invention belongs to the technical field of pretightening force detection, in particular to a real-time and high-precision detection method and system for bolt pretightening force based on a piezoelectric ultrasonic chip. Background technique [0002] As a commonly used connecting piece, bolts are widely used in engineering. The axial preload exerted on it has a great influence on its performance and life. Too small a pre-tightening force will cause unreliable connection, vibration relaxation, leakage, structural slippage and other phenomena during work, which will affect the normal operation of the machine; too large a pre-tightening force will increase the structural size of the bolts, resulting in It is easy to break under the action, thereby weakening the bearing capacity of the node, and may induce structural instability in severe cases. Stress measurement inside the bolt can prevent accidents, ensure uniform stress on the bolt, and optimize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24G01L5/00
CPCG01L5/0042G01L5/246
Inventor 孙清超袁博孙伟丁杰城
Owner DALIAN UNIV OF TECH
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