Visualized Representation Method Of Equipment Failureure In Subway Station Based On Sand Table

The station equipment monitoring system is one of the important means for the safety management of the subway station equipment.Limited by the size of the display screen,the traditional station equipment monitoring system can not directly monitor the station's overall situation,but can only monitor a specific area.In order to solve this problem,this paper puts forward the station equipment monitoring system combining physical sand table and virtual station scene.The system is characterized by the ability to conduct global monitoring of station equipment through physical sand table.When the equipment failures,the location of the fault device can be quickly located.At the same time,the virtual scene,as a supplementary display,can present the visual equipment failureure information to the user,and make up the deficiency of the physical sand table in the details.How to realize information interconnection between sand table and virtual scene,and how to control the change of virtual station scene by controlling the walkthrough avatar in the sand table is the key to the realization of this system.Therefore,this article will study from the design and production of physical sandboxes,the tracking and positioning of the walkthrough avatar,and the interaction between the physical sandbox and the virtual station scene.Specific research contents include:(1)The production method of physical sand table was studied.The production of physical sand table includes: Based on the 3D virtual scene of the subway station as raw data,and the physical sand table model of the subway station is made with the technology of sand table design and 3D printing.The fault simulation module of station equipment is designed.After in-depth analysis of the two dimensional walkthrough position and 3d walkthrough position,the concept of walkthrough avatar was proposed and a walkthrough avatar was designed.Through the design of walkthrough avatar,the correlation between physical sand table and virtual scene in walkthrough is established.(2)Study on the tracking and positioning method of walkthrough avatar.The specific idea is: First,use the automatic white balance algorithm for preprocessing.Secondly,the application of the Camshift tracking algorithm is improved from two perspectives based on the H-S two-dimensional histogram backprojection and the addition of directional scale estimation,thereby improving the robustness of the target tracking.Then,the target is subjected to color recognition-based contour detection in the tracking window,and the target contour centroid is calculated as a result of the tracking.Finally,based on the perspective transformation method,the location of the walkthrough avatar on the plane of the sand table is achieved,and the positioning accuracy is corrected.(3)Research on interactive method of linkage walkthrough between physical sand table and virtual scene.First,a pitch angle control module was designed to simulate the pitch angle of a roving avatar.Then,combined with the positioning information,pitch angle and the design of the walkthrough avatar itself,it completely describes the mathematical model of the walkthrough substitute's walkthrough pose in the sand table;analyzes the mapping relationship between the virtual reality scene and finally realizes the interactive walkthrough interaction,thus virtual The advantages of visualization in walkthrough technology are reflected in the walkthrough of physical sand tables.Finally,the communication design of the fault simulation module is completed,and the synchronous response of the fault information of the equipment in the virtual scene is realized.(4)The development of station equipment monitoring system combined with physical sand table and virtual station scenarios.By running examples,the accuracy and validity of tracking and positioning of walkthrough avatar on the sandbox are verified.Through the simple fault simulation of subway equipment,it verifies the feasibility that the interaction mode of entity sandbox and virtual station scenario linkage walkthrough is applied to the visual monitoring of equipment faults.