Web-Based Digital Twin
simulation data management ( SDM ) is needed . The digital twin makes its data and functions available to external entities via interfaces and accesses their resources . These entities include , for example , other digital twins , assets , and humans .
Fig . 5 shows the structure of the digital twin . In the following , we would like to discuss the individual aspects . As a web-based application , the digital twin must ensure access to resources via HTTP-interface . All information and functions provided must be able to be called , changed , saved or controlled in this way . The web server makes it possible to provide resources , for example , by means of web pages via HTTP .
Clients Web Client
External Data Database
Cloud
OPC UA Client
External Simulation
Simulation in the Cloud
Asset OPC UA Client Machine
HTTP OPC UA
Fig . 5 : Web-based digital twin .
SDM DT SDM DT 1
SDM DT n
The web server stores the data of the web server itself , as well as of the digital twin , in databases . This can be , for example , user login data , data from product development or the operating data of the asset . If the size of the data load exceeds the available memory , additional external databases are used . The web server has access to the asset ' s data and presents the information by means of web pages . Simple texts , images , graphics or videos can be integrated directly .
The visualization of special file formats such as CAD ( Computer Aided Design ) models is enabled by libraries of the JavaScript scripting language , which although does not support all file formats like most native ones . Neutral or standardized file formats , such as STEP ( STandard for the Exchange of Product model data ), IGES ( Initial Graphics Exchange Specification ), STL ( Standard Triangulation Language ) or VRML ( Virtual Reality Modeling Language ) differ in their information content . While STEP transfer most of the information from a native format , STL as a 3D format
- 8 - March 2021