Digital twin driven high precision reconstruction method for full-field deformation of structure

To address the issue that traditional direct and indirect deformation monitoring methods are difficult to meet the requirements of high-precision real-time deformation monitoring of structures, a digital twin-driven high-precision reconstruction method for full-field deformation of structure is proposed. Firstly, a multi-directional digital twin strain field is constructed by integrating simulation and measured strain data, which reduces the influence of load deviation and other factors on the simulation reliability, and ensures the strain accuracy of the deformation reconstruction. Secondly, a modal coordinate solving and deformation reconstruction method considering multi-directional strain is proposed. By incorporating multi-directional strain in the modal coordinate solving process, this method solves the problem of insufficient stability of the reconstruction results when single-directional strain is used, and improves the stability of the full-field deformation reconstruction of the structure. Finally, based on the proposed method, the experimental validation is carried out with the wing structure, and the results are compared with the simulation and the deformation reconstruction results of the traditional modal superposition method. The result shows that the proposed method has a higher advantage of 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 0.8%, and the absolute error is less than 0.09 mm, which is 7% and 12% lower than that of the traditional modal method and the simulation method, respectively. At the same time, the average relative error of the proposed method for deformation reconstruction at multiple measurement points is 1.2%, which is 5.7% and 9.3% lower than that of the traditional modal method and simulation analysis method, respectively. Moreover, when the number of strain gauges is small, the deformation reconstruction accuracy of the proposed method is improved by more than one order of magnitude compared with the traditional modal superposition method, which indicates that the proposed method has higher deformation reconstruction accuracy and stability.