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Health Assessment and Fault Detection System for an Industrial Robot Using the Rotary Encoder Signal

Author

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  • Riyadh Nazar Ali Algburi

    (Engineering Research Center of Advanced Driving Energy-saving Technology, Ministry of Education, Chengdu 610036, China
    Mechatronics Department, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610036, China)

  • Hongli Gao

    (Engineering Research Center of Advanced Driving Energy-saving Technology, Ministry of Education, Chengdu 610036, China
    Mechatronics Department, School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610036, China)

Abstract

In an industrial robot, rotary encoders have been extensively used for dynamic control and positioning. This study shows that the encoder signal, after appropriate processing, can also be efficiently utilized for the health observation of energy performance of industrial robots system. Singular spectrum analysis (SSA) and Hilbert transform (HT) is proposed in this work, for detecting weak position oscillations to estimate the instantaneous amplitudes (IA) and the instantaneous frequencies (IF) of an industrial robot based on the encoder signal. Compared with empirical mode decomposition (EMD) and HT, the singular spectrum analysis and Hilbert transform (SSAHT) outperforms empirical mode decomposition Hilbert transform (EMDHT) in terms of ability and precision to determine source noise, and it can accurately catch the weak oscillations without signal deformation in both position and speed introduced via mechanical flaws. Combined with SSA, the IA and IF of both oscillations and residual are extracted by HT. They are obtained from the robot arm movement. These features play an important role in improving the performance detecting weak oscillations and the residual, essential information to evaluate the health conditions and fault detection to serve the energy performance for the industrial robot. The efficiency of the proposed system has been verified both numerical simulation and experimental data. The outcomes prove that the proposed SSAHT can detect flaw indications and additionally, it can also identify faulty components. Thus, the study presents a promising tool for the health monitoring of an industrial robot instead of the vibration-based monitoring scheme.

Suggested Citation

  • Riyadh Nazar Ali Algburi & Hongli Gao, 2019. "Health Assessment and Fault Detection System for an Industrial Robot Using the Rotary Encoder Signal," Energies, MDPI, vol. 12(14), pages 1-25, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2816-:d:250569
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    References listed on IDEAS

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    Cited by:

    1. Prashant Kumar & Salman Khalid & Heung Soo Kim, 2023. "Prognostics and Health Management of Rotating Machinery of Industrial Robot with Deep Learning Applications—A Review," Mathematics, MDPI, vol. 11(13), pages 1-37, July.

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