Design of Digital Twin System for Blade Water Jet Surface Strengthening Process

Water jet surface strengthening is an effective way to improve the fatigue life of aeroengine blades. In view of the fact that the water jet surface strengthening equipment and process system have no ability to monitor, detect, predict and make decisions on the strengthening process, the digital twin technology is introduced into the water jet surface strengthening process. Firstly, according to the principle of water jet strengthening technology, the framework of digital twin system for water jet surface strengthening was defined; Secondly, the design of the digital twin system was completed at the five levels of physical level, model level, data level, application level and data transmission level, which realized the virtual mapping of the strengthening equipment and process in the physical world, as well as the connection and interaction between all levels. The application case showed that the developed digital twin system had the ability to monitor the condition of the strengthening equipment in real time, detect the surface integrity of the strengthened blade, predict the strengthening effect under the specific strengthening process, and provide decision support for the selection and optimization of the strengthening process.