Abstract: Digital twin is a hot point nowadays,and has received great attention from both academia and industry.The first problem faced by users when utilizing digital twin is how to realize the modeling of a digital twin.However,model is a core part in any digital twin as well as its industrial application.Unfortunately,there is no criterion for digital twin modelling until now,and it lacks theoretical support for accurate modeling when studying and utilizing digital twin.For addressing this problem,the modelling criterion of digital twin was put forward.Then a theoretical system for digital twin modelling was established from six aspects,including model construction,model assembly,model fusion,model verification,model validation and model management.The proposed criterion and theory for digital twin modelling were applied in the construction of Digital Twin Shop-floor (DTS).Furthermore,three key technologies in DTS,including modeling of shop-floor elements,modeling of data-driven dynamic production process and modeling of production system simulation were studied in detail.These works were expected to provide theoretical references for the construction and application of digital twin in different industrial fields,especially in shop-floor.

Key words: digital twin, smart manufacturing, digital twin shop-floor, modelling, modelling criterion, theoretical system

摘要： 数字孪生作为实现数字化转型和促进智能化升级的重要使能途径,一直备受各行各业关注,已从理论研究走向了实际应用阶段。数字孪生是以多维虚拟模型和融合数据双驱动,通过虚实闭环交互,来实现监控、仿真、预测、优化等实际功能服务和应用需求,其中数字孪生模型构建是实现数字孪生落地应用的前提。针对如何构建数字孪生模型问题,首先提出了数字孪生模型“四化四可八用”构建准则。基于所提出的构建准则,从“建—组—融—验—校—管”6个方面探索建立了一套数字孪生模型构建理论体系。并基于所提出的数字孪生模型构建准则和理论体系,结合笔者团队承担的国家重点研发计划项目“基于数字孪生的智能生产过程精确建模理论与方法”,以数字孪生车间为例,从车间要素实体建模、生产过程动态建模、生产系统仿真建模3个方面对数字孪生车间模型构建理论与技术开展了研究和实践。相关工作期望能为数字孪生构建和进一步落地应用提供理论参考。

关键词: 数字孪生, 智能制造, 数字孪生车间, 建模, 构建准则, 理论体系