Research And Development Of 3D Visualization System Of Digital Factory

With the proposal of concepts such as industry 4,industrial Internet and Chinese manufacturing 2025,digitalization has become the inevitable trend of future manufacturing.An effective integration of 3D visualization of factory and real-time operation system,which breaks down information isolation throughout comprehensive digitalization process and enhances efficiency of information sharing,would effectively accelerate not only the process automation and intelligentalization of factory management but also the upgrading of the manufacturing industry in China.The system aims to provide users with timely and real display of navigation and surveillance by integrating 3D design information with real-time data.The following key techniques were studied to present immersive and fluent scene navigation and real-time operation monitoring functions:(1)3D visualization solution for factory operation and management.The web-based system was developed on Unity3 D,which served as the front-end development platform.The back-end framework was based on the integration of Spring,SpringMVC and MyBatis.The system provided an plug-in-free WebGL entry from browser which enables viewing 3D model of factory and querying real-time data.(2)Model simplification and optimization of scene rendering of a large-scale factory.Model reuse was achieved by heterogeneous data conversion of original design model of factory.A simplification scheme of large-scale factory model was proposed,including simplification through deleting detailed features,simplification based on primitives and merging coaxial models of the same type.Level of details(LOD)was applied to optimize scene rendering by dynamically rendering models of different LOD based on real-time distance between viewpoint and model.This approach effectively reduces number of triangular patches to be rendered and thus enhances scene fluency.(3)An approach to increase speed of loading a large-scale scene system.The volume of scene files is reduced by =separating the model and other resources from the scene files,and thus shortening time of the loading of the system scene along with the caching mechanism.The combination of asynchronical loading of models and LOD ensures the fluency of scene refreshment and presented models in the scene by gradually increasing model fineness.(4)An assembly planning optimization based on ant colony algorithm.The assembly model was proposed based on the geometric feasibility constraints,with high stability and low cost for redirection as optimization objectives.The ant colony algorithm helps find the optimal solution of assemble sequence.The above approaches were applied in the 3D visualization system of a factory,which enables 3D navigation,device monitorging,warning,initiative safety,surveillance,virtual assembly and managing sensors.The feasibility and effectiveness of the proposed scheme were verified through an application in power plant.The scheme can be widely used in factory operation monitoring,management and training.