System Operations Studies for Automated Guideway Transit Systems: Quantitative Analysis of Alternative AGT Operational Control Strategies

摘要

The objectives of the Systems Operation Studies (SOS) for automated guideway transit (AGT) systems are to develop models for the analysis of system operations, to evaluate performance and cost, and to establish guidelines for the design and operation of ACT systems. This report documents analyses of the performance, cost, and operating characteristics of the functions of vehicle control, headway protection, longitudinal control, merge strategy, and dispatch strategy. Several options were defined for each control function and evaluated both analytically and through experiments of vehicle motion on link, merge, and intersection guideway elements at the subsystem level. Several specific control strategy combinations were also evaluated at the system level through AGT system simulations. The performance effect of vehicle entrainment both at stations and on the guideway was also evaluated at the system level. Alternative strategies/combinations were compared and guidelines were stated for choosing between control alternatives. The minimum operational headway analysis showed that the vehicle control and headway protection combination consisting of continuous moving block headway protection and fixed block vehicle follower vehicle control offers no advantage over the simpler combination using fixed blocks for both functions. In all cases, point follower control was found to require longer headway separation than vehicle follower control because of the focusing distance phenomenon during line speed changes.