Health management method of crack propagation structures based on digital twin

CHANG Qi, CHEN Lele, ZHAO Heng, XIE Fangqin, GAO Heming

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 253-260.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (9) : 253-260.

Health management method of crack propagation structures based on digital twin

  • CHANG Qi,  CHEN Lele, ZHAO Heng, XIE Fangqin, GAO Heming
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Abstract

Fatigue cracks are one of the common damages of metal structures. A method of constructing a digital twin model to manage the health of crack propagation structures is proposed. In the process of establishing the digital twin model, the finite element model of the crack structure is first established, and the crack propagation model is established by combining the Paris formula; Secondly, based on the Dynamic Bayesian Network, the law of crack state evolution with time is represented; Finally, the particle filter algorithm is used as the inference algorithm of the model, so as to complete the description of the crack propagation behavior in digital space. The crack state is monitored online in real time through the strain sensor, which drives the dynamic update of the twin model to achieve a more accurate prediction of the crack propagation state and remaining useful life. The effectiveness and practicability of this method in structural health management of crack propagation are verified by experiments.

Key words

digital twin / fatigue crack propagation / health management / Dynamic Bayesian Network / particle filter algorithm

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CHANG Qi, CHEN Lele, ZHAO Heng, XIE Fangqin, GAO Heming. Health management method of crack propagation structures based on digital twin[J]. Journal of Vibration and Shock, 2023, 42(9): 253-260

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