On Dynamic Risk Analysis And Evaluation Method Of Escalator In Rail Transit Hub

Escalators have a key position in the facilities of the hub because of their ability to transport passengers quickly and easily,and to efficiently dissipate passenger traffic.While the escalator brings convenience to everyone’s life,the safety of the escalator’s operation also attracts people’s attention.Due to the high frequency of use,the escalator frequently fails,and the maintenance method still mainly adopts "fault repair".In addition,Some fault risks do not occur suddenly,but are caused by the accumulation of multiple fault factors over a long period of time.These faults are often difficult to identify by human in the early stage.In this regard,the traditional method is to reduce the failure rate of escalators through high-frequency maintenance and maintenance,but this will lead to increased maintenance and maintenance costs.Aiming at this problem,this thesis studies the dynamic risk analysis and evaluation method of escalator,which is of great significance for identifying and blocking potential risks,reducing escalator failure rate and reducing maintenance costs.Firstly,failure mode and effect analysis(FMEA)method is used to analyze and evaluate the static risk of escalators in transportation hubs,through the risk analysis and evaluation of the escalator as a whole,the failure risk of the escalator is obtained.Secondly,aiming at the weak link of escalator failure risk obtained in static risk analysis,this thesis proposes a research method based on the combination of feature quantity and risk chain.The voltage imbalance is selected as the feature quantity.And the escalator failure risk propagation chain caused by voltage imbalance is established.So the relationship between the failure rate of the escalator and the change of the characteristic quantity could be obtained.This thesis uses Anylogic software to simulate the risk consequences of passenger flow and obtain the dynamic risk consequences of escalators.Finally,the transportation hub of Chongqing North Station is selected as the analysis case in this thesis,the analysis results show that the risk consequences caused by the escalator faults in different locations in the transportation hub are quite different.Therefore,for escalators with different risk levels.Different thresholds could be set to be early warning signals and different maintenance strategies could be adopted,which will provide effective theoretical support for risk control of escalator electrical faults in transportation hubs.Through the dynamic risk analysis of the escalator of the transportation hub,the risk of the escalator can be reduced by monitoring the risk source that causes the escalator failure,and the escalator risk escalation chain can be analyzed through the analysis of the failure mechanism risk propagation chain of the escalator electrical fault.The maintenance strategy is changed from fault repair to predictive repair,and prevention in advance can save a lot of manpower and material resources and reduce maintenance costs.