关键词: 复杂产品, 数字孪生装配, 精准建模, 装配实测数据, 精度预测

Abstract: Aiming at the practical engineering application problems such as the disconnection of assembly model,data and information,the inaccurate accuracy prediction,and lack of effective guidance for field assembly during the assembly of complex products,a model expression and accuracy prediction method of digital twin-based assembly model for complex products were proposed.The overall process of assembly accuracy prediction for complex products based on digital twin was given.The digital twin-based assembly model was divided into digital twin-based assembly object model and digital twin-based assembly process model,and the accurate modeling mechanism of product digital twin-based assembly model was clarified.On this basis,by the update and iteration mechanism of assembly deviation transfer based on measuring data,the product assembly error analysis and assembly accuracy prediction that integrate multi-dimensional error sources were used to be realized.Taking a certain type of satellite structure assembly as example,the corresponding software and hardware system platform of digital twin assembly for complex products was built,and the feasibility of the above method was verified through an example,which provided a feasible new idea and new way for assembly accuracy prediction and assurance for complex products.

Key words: complex products, digital twin-based assembly, accurate modeling, assembly measuring data, accuracy prediction