Assembly tolerance analysis for spacecraft cabin considering non-ideal surface

Due to manufacturing and assembly errors, the assembly accuracy of the spacecraft cabin is inevitably affected. To minimize these errors and improve operational performance, we apply a comprehensive assembly accuracy analysis method that accounts for non-ideal surfaces. First, a 3D model of the cabin’s non-ideal surfaces is developed using skin model shapes and small displacement torsor theory to represent form and positional errors, respectively. However, previous studies have often overlooked the impact of form errors. Next, an improved deviation propagation model is introduced to analyze the assembly of multi-segment cabins while considering surface imperfections. Finally, a simulation study is conducted using a cabin simulation component as the research object. The results confirm the method’s effectiveness in predicting the assembly accuracy of cabins with non-ideal surfaces.