Abstract
The harmonic reducer is an essential kinetic transmission component in the industrial robots. It is easy to be fatigued and resulted in physical malfunction after a long period of operation. Therefore, an accurate in-situ fault diagnosis for the harmonic reducers in an industrial robot is especially important. This paper proposes a fault diagnosis method based on deep learning for the harmonic reducer of industrial robots via consecutive time-domain vibration signals. Considering the sampling signals from industrial robots are long, narrow, and channel-independent, this method combined a 1-dimensional convolutional neural network with matrix kernels (1-D MCNN) adaptive model. By adjusting the size of the convolution kernels, it can concentrate on the contextual feature extraction of consecutive time-domain data while retaining the ability to process the multi-channel fusion data. The proposed method is examined on a physical industrial robot platform, which has achieved a prediction accuracy of 99%. Its performance is appeared to be superior in comparison to the traditional 2-dimensional CNN, deep sparse automatic encoding network (DSAE), multilayer perceptual network (MLP), and support vector machine (SVM).
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This work was supported by the Basic and Applied Basic Research Fund of Guangdong Province (Grant No. 2020B1515120010).
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Zhou, X., Zhou, H., He, Y. et al. Harmonic reducer in-situ fault diagnosis for industrial robots based on deep learning. Sci. China Technol. Sci. 65, 2116–2126 (2022). https://doi.org/10.1007/s11431-022-2129-9
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DOI: https://doi.org/10.1007/s11431-022-2129-9