关键词: 数字孪生, 变形反演, 模态叠加, 数据融合, 机翼结构

Abstract: Aiming at the traditional direct and indirect deformation monitoring methods that are difficult to meet the problem of high-precision real-time deformation monitoring of structures, a digital twin-driven method for high-precision reconstruction method of full-field deformation of structures is proposed. Firstly, a multi-directional digital twin strain field is constructed by integrating the simulation and measured strain data, which reduces the impact of load deviation and other factors on the reliability of simulation and ensures the strain accuracy of deformation reconstruction; secondly, a multi-objective optimization-based modal coordinate solving and deformation reconstruction method is proposed, which uses the multi-directional strains of the structure to participate in modal coordinate solving, and solves the problem of insufficient stability of the deformation reconstruction results when single-directional strains are used, and improves the robustness of the full-field deformation reconstruction of the structure. Finally, based on the proposed method, the experimental validation is carried out using the wing structure as an object, and the results are compared with the simulation and the deformation reconstruction results of the traditional modal method, and the results show that the proposed method has a higher advantage of deformation reconstruction accuracy in the place of large deformation. The relative error between the reconstruction results of the proposed method and the measured deformation is less than 0.5%, and the absolute error is less than 0.06 mm, which is 8% and 13% lower than that of the traditional modal method and the simulation method, respectively. Meanwhile, the average relative error of deformation reconstruction of the proposed method for multiple measurement points is 0.8%, which is 6.1% and 9.6% lower than that of the traditional modal method and the simulation analysis method, respectively, indicating that the proposed method has a high accuracy of deformation reconstruction.

Key words: Digital twin, Deformation reconstruction, Modal superposition, Data fusion, Wing structure