Influence Of A Platform Screen Door Fault Caused By Piston Wind In Multi-train Mode

With the rapid development of society,the urban travel population has grown rapidly.In order to meet the travel needs of passengers,the speed and density of urban rail transit trains are increasing,the piston wind effect in subway tunnels is also significantly enhanced,and the frequency of platform screen door failures caused by excessive piston wind is increasing.Therefore,it has important practical significance to study the failure of the platform screen door caused by the excessive piston wind pressure in the multi-train mode.First,the formation mechanism of the tunnel piston wind is analyzed,and the theoretical calculation formula of the tunnel piston wind is derived;At the same time,a tunnel piston wind simulation model based on multi-train mode is proposed by analyzing the failure of the platform screen door of Metro Line 1 in a certain city.After that,2D and 3D simulation methods were used to numerically simulate the flow field in the tunnel,and the correlation between the simulation and the actual measurement was calculated based on the field measured data and the Pearson correlation coefficient to verify the accuracy and reliability of the simulation.Then,the influence of piston wind on the platform screen door failure under different working conditions is analyzed by simulation,and the correlation degree between different working conditions and standard working conditions is calculated by using the grey correlation analysis method.Then,the cause of the failure of the platform screen door opening and closing was determined by analyzing the mechanical structure of the platform screen door;Through the force analysis of the open and closed state of the platform screen door,the corresponding formula for calculating the driving force of the platform screen door is derived;Then,the finite element model of the sliding door of the platform screen door was established,and the friction force of the sliding door was obtained through finite element simulation,and the experimental verification of the influence of the piston wind on the failure of the platform screen door was completed.Finally,the platform screen door fault identification and motor output force prediction model is proposed based on FOA-GRNN,which realizes the automatic identification of the wind pressure failure of the platform screen door in the multi-train mode.The model provides theoretical and technical support for fault identification and intelligent operation and maintenance of rail transit screen door systems.