Abstract: To solve the difficulties in the integration and interaction of information space and physical space caused by factors such as multi-discipline,multi-physical quantity,multi-scale and dynamic time-varying in the manufacturing process,a digital twin high-fidelity modeling method was proposed by taking the spinning forming process of aerospace thin-walled parts as the object.The spinning digital twin high-fidelity model was described and defined from three levels of geometry,mechanism and data.Based on the constructed digital twin model,the knowledge acquisition process of spinning processing was studied.The data mapping and comparison process of the spinning process was studied.In addition,to evaluate the validity of the built model,a fidelity evaluation method of the digital twin model was proposed.A case verification showed that the proposed digital twin high-fidelity modeling method was effective and the constructed model could be evaluated.

Key words: digital twin, high-fidelity modeling, aerospace thin-walled parts, spinning forming, virtual-physical fusion, model evaluation

摘要： 为解决制造过程中多学科、多物理量、多尺度、动态时变等因素带来的虚实融合困难问题,以航天薄壁件旋压成型加工过程为对象,提出一种数字孪生高保真建模方法。该方法分别从几何、机理和数据3个层次描述和定义模型,并基于构建的模型研究了旋压加工过程知识获取和数据虚实映射过程。为评估所建模型的有效性,给出了一种数字孪生模型的保真度评估方法。通过案例验证了所提数字孪生高保真建模方法的有效性和模型的可评估性。

关键词: 数字孪生, 高保真建模, 航天薄壁件, 旋压成型, 虚实映射, 模型评估