Abstract:

In order to prevent safety accidents caused by fatigue failure of mining drilling rigs due to overload, a safety condition monitoring technology of drilling rigs based on digital twins was studied. First, the overall framework of the digital twins-based monitoring system for safe operation conditions of drilling rigs was proposed, and then a real-time analysis method of drilling rig stress conditions based on a proxy model was studied. The finite element method was used to obtain stress distribution and amplitude data sets of the rig overturning frame, which were used for training and testing the proxy model. The results show that the maximum difference between the large-scale stress value calculated by the finite element method and the predicted value by the proxy model does not exceed 5×10^-6 MPa. The absolute variance of the difference between the predicted values and the calculated values at all nodes is about 2×10^-6 MPa. This shows that the proposed proxy model can be used instead of the finite element method to analyze the real-time stress of the rig overturning frame.

Key words: digital twins, mining drilling rig, condition monitoring, proxy model, stress condition