Abstract:Aiming at the difficulty of achieving the expected accuracy when measuring the stress of high-strength short bolts by the ultrasonic conventional attenuation method, a method based on ultrasonic scattering attenuation theory and wavelet multiscale decomposition is proposed to measure the stress of bolts. Firstly, a theoretical model of the relationship between ultrasonic attenuation coefficient and stress is derived based on Rayleigh scattering of cubic crystal system materials. Secondly, the wavelet transform is used to obtain the attenuation coefficients of each scale and define the weighted ultrasonic multiscale attenuation coefficients, combine the particle swarm optimization algorithm and gray correlation analysis to determine the optimal scale combination of the attenuation coefficients and their normalized weight coefficients, and establish the ultrasonic multiscale attenuation measurement model of axial stress. Then, using the constructed bolt axial stress ultrasonic measurement system, the axial stress measurement of common bolts was performed, and the feasibility of the method was demonstrated. Finally, the axial stress measurements of high-strength short bolts by the multi-scale attenuation method were compared with transition time method and the traditional attenuation method, and it is verified that the ultrasonic multiscale attenuation method is more suitable for the axial stress measurements of high-strength short bolts.
余鑫,陈平,胡义亮,付统,李长泽 . 基于超声多尺度衰减的螺栓轴向应力评价[J]. 振动与冲击, 2024, 43(2): 226-233.
YU Xin,CHEN Ping,HU Yiliang,FU Tong,LI Changze. Evaluation of the axial stress in bolts based on the ultrasonic multi-scale attenuation method. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(2): 226-233.
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