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A Micro Manufacturing Unit (MMU) used in this research is a digital twin research environment to study how to construct a digital twin and what kind of information is needed to describe the realistic behavior of the digital model of a micro manufacturing unit. Physical twin, a digital twin and the model must be equal. In this study, the MMU is modelled with commercial 3D-modelling software and restrictions and realistic movement were added to model. This study shows the main characteristics and the restriction needed to describe MMU model, which is used later on as an element of overall a digital twin. Overall, digital twin consists of a machine, material, method, measurement and modeling fields like a physical world describes it.
Lohtander et al. (2018) studied this question.