《lecture8运输车辆调度》.pdf

Transit Vehicle Scheduling: Problem Description Outline • Problem Characteristics • Service Planning Hierarchy (revisited) • Vehicle Scheduling 11/24/03 1.224J/ESD.204J 1 Problem Characteristics • Consolidated Operations (vs. Direct Operations) • Passengers (vs freight) being moved • Urban vs. intercity (short vs. long trip lengths) • Relatively high service frequency (several trips per hour vs one trip per day) • High temporal variation in demand within day • Feasible speeds vary by time of day if vehicles affected by traffic congestion • Operations/service plan is stable over a period of months • Different type of competition • May be a public agency or a private company • Crew costs are significant fraction of total costs • Routes have many nodes 11/24/03 1.224J/ESD.204J 2 Temporal Variation in Vehicle Requirements and Vehicle Blocks Vehicles 900 in service 600 300 0 6:00 9:00 12:00 15:00 17:00 21:00 Time of day 11/24/03 1.224J/ESD.204J 3 Service Planning Hierarchy Input Function Output Demand characteristics Network and Set of routes Infrastructure Route Design Resources Policies (e.g. coverage) Demand characteristics Service Frequency Resources Frequency Setting by route, day, and Policies (e.g. headways time period and pass loads)