Research On Typical Disasters And Emergency Drills For Water Transmission Projects Based On Virtual Reality

The water conveyance project has a long route and complex geological environment along the line,and the safe operation of the project is threatened by various dangerous situations.Carrying out typical disaster simulation and emergency drill training can improve the ability of safety inspectors to identify dangerous situations and handle emergencies.Virtual reality technology can truly restore the real danger scene without being constrained by geographical space and time.In a virtual environment,patrol inspectors can conduct targeted rescue training on possible dangerous situations during the safe operation of water transmission projects.This thesis mainly focuses on two aspects of virtual simulation of typical water disasters in water conveyance projects and emergency plan deduction simulation.Visualize the characteristics of typical water disaster scenarios through graphical technology,compile corresponding virtual rescue processes according to emergency plan guidelines,and train participants to make timely and correct judgments.This article takes two typical disaster and emergency plan processes in water transmission projects as examples to conduct research around the need for realism and immersion in virtual drill training.The main work is as follows:(1)Using the position-based dynamics method for fluid and emergency material simulation: the fluid model constructed using the SPH method has a computational process that needs to be optimised and has poor real-time interactivity.Real-time fluids are simulated using a position-based fluid modelling approach,which solves the fluid model and builds fluid effects by constraining fluid density,vorticity and viscosity.The priori modelling of the rescue materials that may be used in the current mainstream virtual training system leads to a poor immersion of trainees in the virtual exercise and prevents the training of the rescue material building process.In this regard,a method of modelling emergency materials based on the idea of position-based dynamics is proposed,in which the material characteristics of several commonly used emergency materials are analysed and the constraints are combined to solve the instantiation equations.Based on the HTC Vive Cosmos virtual reality device,the interaction between the trainees and the emergency materials is realised,making the virtual training effect more realistic and enhancing the immersion.(2)A turbid fluid rendering method based on scattering is proposed: Most current fluid rendering methods are insensitive to the color representation of the fluid,and generally do not consider the scattering phenomenon of turbid fluid.However,in the emergency rescue process,the color of the fluid is sometimes one of the important conditions for identifying the risk level,and the accuracy of the color affects the final training effect.In this regard,adaptive mesh method and mesh free method are proposed for rendering turbid fluid to accurately simulate fluid color and enhance visual realism.(3)Design an emergency rescue rehearsal process based on a serious game concept: By analyzing the emergency plan process for typical dangerous situations,incorporate the characteristics of the dangerous situation,the plan process,and emergency knowledge into the rehearsal script,instead of directly instructing virtual training participants to operate,use pre and post related events to compose the training content;Guide participants to actively consider emergency rescue measures through virtual role behavior;Design and implement emergency training scenarios for piping hazards and aqueduct flooding to verify the reliability of the guidance method.