Aiming at the problems of difficult quality inspection and control and serious accumulation of assembly errors in the manufacturing process of civil aircraft parts

the research on deviation transmission in aircraft assembly process is carried out. Firstly

the assembly process of certain type of hatch is analyzed. Based on the MBD model

the modeling idea of digital twin model—“point cloud data reconstruction theoretical model + multi-stage derivative information mounting such as manufacturing

assembly and debugging” is proposed. The key construction technology of digital twin model for assembly process is given

and the digital twin model of a part of hatch is established. Secondly

based on the assembly characteristics of digital twin model

the Jacobian spinor model is modified through the variation relationship of key features of parts

and a deviation transfer calculation method based on digital twin is proposed. Finally

taking two parts of a mechanism assembly of the hatch as an example

the assembly deviation of the component is simulated and calculated by 3DCS software. Compared with the theoretical calculation and simulation results

the results show that the deviation transfer calculation method mentioned is effective and reliable.