lec12 - Real-Time Control Strategies for Rail Transit...

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12/08/03 1.224J/ESD.204J 1 Real-Time Control Strategies for Rail Transit Outline: Problem Description and Motivation Model Formulation Model Application and Results Implementation Issues Conclusions
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12/08/03 1.224J/ESD.204J 2 Problem Context High frequency urban rail service (e.g. headways of 2-10 minutes) passengers arrive randomly service regularity is a key goal E(WT) = E(H) [1 + cov(H) 2 ] 2 Branching route structure Central real-time train location information and dispatch capability
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12/08/03 1.224J/ESD.204J 3 Three Levels of Control Problems Routine disturbances - several minutes’ deviation from schedule Control Strategies: speed adjustment dwell time adjustment (selective holding) terminal recovery Short-term disruptions : 5-30 minute blockages on the line Longer-term disruptions - greater than 30 minute blockages Control Strategies: single-track reverse direction operations replacement bus service around blockage
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12/08/03 1.224J/ESD.204J 4 Blockage Held trains Train Station KEY Terminal A Terminal B X Express train after clearance short-turn option 1 short-turn option 2 Disruption Response Strategies
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12/08/03 1.224J/ESD.204J 5 Problem Description Overall Objective: -- Develop a real-time decision support system to determine control strategies to recover from disruptions Specific Objective: -- Minimize passenger waiting times (implies maintaining even headways) Key Characteristics: -- Instability of even headways -- Passenger sensitivity to long waiting time and crowding -- Cost insensitivity to different strategies Possible Strategies: -- Holding -- Short-turning -- Expressing
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12/08/03 1.224J/ESD.204J 6 Example of Transit Control Strategies Vehicle Stop T1Õ T3 T2 S2
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lec12 - Real-Time Control Strategies for Rail Transit...

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