The state of aircraft flexible tooling is affected by temperature

workpiece state

assembly process and other factors

and is often in a time-varying state. Its twin model has large dynamic information and is complex to build. A modeling method of digital twin geometric model based on finite state machine is proposed in this paper. The dynamic mapping of physical tooling in digital space is realized by means of real-time data acquisition and preprocessing

definition of state and its transfer mechanism

and parameterized geometric entity modeling

which lays a foundation for virtual simulation based on digital twin model. Taking the wing and fuselage docking platform as the object

digital twin geometric models of the wing adjustment mechanisms are established to verify the effectiveness of the method.