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• W4292092484 abstract "• The dynamic model of bolt loosening of industrial robot joint is established. • The electromechanical coupling between motor current and bolt loosening is revealed. • SST clearly reflects the current transient variations caused by bolt loosening. • The extracted time-frequency ridge features diagnose bolt loosening accurately. Since loosening of the bolt connection reduce the stability and working accuracy of industrial robot joint, developing and applying new detection methods to provide effective and reliable diagnosis is still a challenging task. In this study, a detection method for bolt loosening of industrial robot joint based on electromechanical modeling and motor current signature analysis (MCSA) is proposed. Firstly, a dynamics model is established based on the electromechanical coupling characteristics of the robot joint servo system, and the bolt loosening factor in the model is equivalent to the variations of support stiffness. The vibration performance of the system due to bolt loosening is analyzed, and the dynamical equations show the coupling relationship between the motor current and bolt loosening. Then according to the traits of motor current variation, this study proposes to utilize the time–frequency features of the motor current to detect loosening. The energy concentrated time–frequency representation (TFR) is obtained by the synchrosqueezing transform (SST) method, and then time–frequency ridges are extracted. The features of the time–frequency ridges are adopted as indicators of the bolt loosening. The support vector machine (SVM) classifier is utilized to identify the loosening of bolts. The simulated motor current signal analysis shows that the SST can highlight the current transients caused by bolt loosening. The bolt loosening experiment is conducted on the single-degree-of-freedom servo joint test bench, and the results prove the effectiveness of the proposed method." @default.
• W4292092484 created "2022-08-17" @default.
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• W4292092484 date "2023-02-01" @default.
• W4292092484 modified "2023-09-29" @default.
• W4292092484 title "Electromechanical coupling modeling and motor current signature analysis of bolt loosening of industrial robot joint" @default.
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• W4292092484 doi "https://doi.org/10.1016/j.ymssp.2022.109681" @default.
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