Optimization model for hot standby EMU configuration in high-speed railway networks

QU Yunteng; YANG Shirui; YANG Jun; ZHAO Dongsheng; ZHAO Peng

doi:10.11860/j.issn.1673-0291.20240104

Abstract：The configuration of hot standby EMUs in high-speed railway networks directly affects emergency response efficiency and operational costs.To address issues such as coarse management and inadequate risk coverage in existing configuration approaches,this study proposes an optimization method based on comprehensive accident risk coverage across the network.First,considering both the timeliness and cost-effectiveness of emergency response,a multi-objective planning model is con-structed with dual objectives to minimize emergency response time and configuration costs for hot standby EMUs.The model integrates point coverage and arc segment coverage methods to accurately represent the requirements for sequential tasks and inter-section rescue scenarios.It incorporates con-straints related to emergency rescue point demands,response time limits,and full coverage of risk points,enabling effective adaptation to complex railway networks and the uncertainty of sudden inci-dents.Second,the ε-constraint method is used to solve the model,overcoming limitations associated with traditional weighted coefficient methods such as dimension normalization and parameter setting.This approach generates multiple sets of Pareto-optimal solutions,providing flexible options for decision-making.Finally,a case study is conducted on the high-speed railway network managed by a specific railway bureau.The research results indicate that the model produces reasonable configuration schemes aligned with various optimization objectives.As the number of hot standby EMUs increases,the maximum reduction in emergency response time reaches 29.3%,while configuration costs remain effectively controlled.Sensitivity analysis confirm the model's strong adaptability to varying response time constraints and risk point distribution characteristics.This method provides a theoretical basis and practical guidance for the scientific configuration of hot standby EMUs and serves as a reference for enhancing the emergency management system of high-speed railways.