Load monitoring of bolted spherical joint connection based on wavelet packet energy analysis

Abstract

Abstract: Aiming at the problem that the bolts, sleeves and other components will be damaged by the force change in the connection area during the installation and use of the bolt ball joint, and the joint failure will occur thereby, piezoelectric (PZT) ceramic sensor are used, based on wavelet packet energy analysis method to study the force monitoring of the bolt ball joint connection area. A scaled grid model composed of bolted ball nodes is designed and made. By applying different torques to the sleeves in the connection area of the bolt ball node, the connection area is in a different tightness state, and different connection areas are constructed. Two PZTs are sticked on the center bolt ball and the rod end close to the bolt ball, respectively, as an exciter and receiver. The wavelet packet analysis is performed on the received stress waves under different torques, and the corresponding stress wave energy is obtained. By calculating the risk index RMSD, the monitoring of the force on the connection area of the bolt ball joint is realized. The test results verify the effectiveness, anti-noise and anti-interference of the wavelet packet energy analysis method, and finally proved the feasibility of monitoring the force state of the bolted ball joint connection area based on the wavelet packet energy method.

Key words: bolted spherical joint connection area, load monitoring, piezoelectric sensor, wavelet packet energy analysis

CLC Number:

TU391

XU Jing, GOU Kang-kang, LIU Ke, ZHANG Chun-wei. Load monitoring of bolted spherical joint connection based on wavelet packet energy analysis[J]. Journal of Lanzhou University of Technology, 2022, 48(1): 134-142.

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