Short bolt axial stress detection method and device based on electromagnetic ultrasonic resonance

By using electromagnetic ultrasonic resonance method, combined with single-wave and dual-wave resonance technology, the problem of low transduction efficiency in axial stress detection of short bolts has been solved, realizing high-precision, non-contact stress detection, which is suitable for complex environments and can quickly identify structural safety hazards.

CN120927181APending Publication Date: 2025-11-11BEIHANG UNIV
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Patent Information

Application Number
CN202511160449.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-19
Publication Date
2025-11-11

AI Technical Summary

Technical Problem

Existing technologies have low transduction efficiency in the detection of axial stress in short bolts, making it difficult to accurately and quickly detect the axial stress of short bolts, especially in high and low temperature environments and on workpieces with poor surface quality.

Method used

An electromagnetic ultrasonic resonance-based method is adopted. By determining the preset period and frequency of the excitation signal, the axial stress of the short bolt is calculated using single-wave and double-wave resonance methods, combined with Fourier transform, empirical mode decomposition and wavelet denoising techniques.

Benefits of technology

It achieves high-precision, non-contact axial stress detection of short bolts, can quickly identify potential structural safety hazards, adapts to various material properties, reduces environmental interference, improves work efficiency, and is suitable for a variety of complex environments.

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Abstract

The invention provides a short bolt axial stress detection method and device based on electromagnetic ultrasonic resonance, and relates to the technical field of industrial fastener stress detection. The method comprises the following steps: determining a preset period and frequency of an excitation signal according to material characteristics of a to-be-measured short bolt, and calibrating resonant frequency and stress to obtain a calibration curve; classifying the lengths of the short bolts to be measured to obtain bolts with known original lengths and in-service bolts with unknown original lengths; based on the determined preset period and frequency, first-order resonant frequency corresponding to the bolt with the known original length is obtained through an electromagnetic ultrasonic transducer and a single-wave resonance method; based on the determined preset period and frequency, first-order resonant frequency corresponding to the in-service bolt with the unknown original length is obtained through an electromagnetic ultrasonic transducer and a double-wave resonance method; and calculating the axial stress of the corresponding short bolt to be measured according to the calibration curve and the first-order resonant frequency. The problems that in the prior art, the energy conversion efficiency is low, and the short bolt detection effect is poor are solved.
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