Assembly analysis of aero-engine mating interface based on digital twin

With the improvement of machining accuracy and quality stability of aero-engine parts，assembly accuracy has gradually become the critical factor affecting product accuracy. To predict the influence of form and position devia⁃ tion of mating surfaces on the product final assembly deviation，assembly error analysis methods based on mathemati⁃ cal models have been developed. However，these methods are constrained by modeling limitations，leading to a sim⁃ plified approximation of the geometric and physical information for the mating interfaces. While the convenience of computational analysis is enhanced，the accurate representation of surface morphology deviations is hindered，thereby，resulting in the inability to precisely analyze their influence on the assembly process. Especially for precision mechanical products，such as aero-engine，small deviations could have an important impact on product quality and stability under large load conditions. Therefore，an assembly deviation analysis method based on digital twin is pro⁃ posed. This solution leverages the digital twin technology as the framework，utilizes the skin model shapes as the modeling method of the mating surface，and combines the data-driven multi-factor simulation model to realize the com⁃ prehensive analysis of influence of the assembly mating surface deviation on the assembly accuracy. A set of engine assembly interface test work pieces are performed，and the effectiveness of the proposed digital twin method is verified by comparing the experiment with simulation results. © 2024 Chinese Society of Astronautics. All rights reserved.