Research On 3D Visualization And Monitoring Technology Of Station Interlocking For Digital Twin

With the deep integration development of new generation information technology and traditional industries,the railroad industry is gradually realizing digital and intelligent transformation.Station interlocking equipment is the key equipment to ensure the safety of rail transit traffic,and is also an important asset of station safety management system.However,the existing station interlocking equipment mainly relies on manual access and preventive maintenance of electrical maintenance machines in operation and maintenance monitoring,which has the problems of poor real-time data interaction and low visualization,making it difficult to meet the digital and refined management needs of modern railroad safety production.The digital twin is an important technical means to realize the physical interaction and integration of information.By effectively connecting to the computer interlocking system,the digital twin is established to realize the online monitoring and management of the operation status of station interlocking equipment.Based on the five-dimensional model of the digital twin,this paper proposes the overall architecture of the3 D visualization and monitoring system of station interlocking for the digital twin,and conducts a study on its implementation.The main research contents are as follows:(1)Research on digital twin architecture system: analyze the development status of digital twin technology and station interlocking equipment monitoring,outline the typical features and technical advantages of digital twin,combine the analysis of the demand for digital twin in station interlocking equipment monitoring,propose the overall architecture design of station interlocking 3D visualization monitoring system for digital twin and elaborate on it.(2)Construction of virtual model of interlocking equipment and its lightweighting:Taking the indoor interlocking equipment of a station as the research object,the 3D model of interlocking equipment of the station is constructed with high-fidelity visual effect by using mixed modeling of Revit and Maya.At the same time,we analyzed the Quadic Error Metrics(QEM)algorithm,proposed to add two constraints of Gaussian curvature and the average area of adjacent grids,and added the midpoint segmentation operation to complete the design of QEM optimization method,and then the two algorithms were tested in terms of the number of model points and surfaces,the actual simplification effect,Hausdorff distance,and the running speed of the algorithm.The two algorithms are compared and analyzed in terms of the number of model points,the actual simplification effect,the Hausdorff distance,and the running speed.(3)WebGL-based model rendering,interaction and data mapping: Combined with computer graphics to study the underlying principles of WebGL technology,we completed the reconstruction,rendering and loading of the virtual model of the station interlocking equipment on the Web side;used the Raycaster class to realize the design of interactive functions such as 3D model picking,3D information display,equipment positioning and equipment fault alarm;studied the data integration and mapping methods and conducted an analysis of the system network.The system topology,database and data flow are designed.(4)System implementation and application: The system functions are designed to meet the requirements of 3D visualization and monitoring of station interlocking,and the development and verification of the prototype system are completed.By introducing digital twin technology in the traditional station interlocking equipment monitoring,it helps the digital transformation of railroad operation and maintenance,and provides a reference for the application research of digital twin in the railroad field.