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Mixed reality-based digital twin implementation approach for flexible manufacturing system design


 Digital twin (DT) technology is essentially the equivalent mapping of the physical world in the digital space, and is therefore also considered to be a central technology to realize cyber-physical systems (CPS). Traditional DT implementations suffer from data diversity and lack of efficient visual human-machine interface while mixed reality (MR) technology provides a new possibility due to its powerful immersion and interactivity. In this paper, we propose an MR-based DT implementation approach for the flexible manufacturing system (FMS) design. Discrete event simulation model and mixed reality scene are applied to enable multiple users to collaboratively evaluate and optimize design schemes in a dynamic simulation way and an immersive and interactive environment respectively. In this approach, an improved particle swarm optimization algorithm is used to solve the facility layout problem which is one of the core problems of FMS design. Furthermore, the DT created in the design stage, which is a virtual representation of the physical FMS, can be extended to the whole FMS lifecycle, including the manufacturing and service stages. A case study of application on a real FMS is presented to illustrate the advantage of this approach.