MIT1_258JS10_lec25

MIT1_258JS10_lec25 - Real-Time Control Strategies for Rail...

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Real-Time Control Strategies for Rail Transit Outline: Problem Description and Motivation odel Formulation Formulation Model Model Application and Results Implementation Issues Conclusions Nigel Wilson 1.258J/11.541J/ESD.226J 1 Spring 2010, Lecture 25B
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e u ba a se ce ead o Problem Context High frequency cy urban rail service (e g ays que (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 ispatch capability dispatch capability Nigel Wilson 1.258J/11.541J/ESD.226J Spring 2010, Lecture 25B 2
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- - - 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 onger rm disruptions reater than 30 minute blockages Longer term disruptions greater than 30 minute blockages Control Strategies: ingle single ack reverse direction operations track reverse direction operations replacement bus service around blockage Nigel Wilson 1.258J/11.541J/ESD.226J Spring 2010, Lecture 25B 3
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Disruption Response Strategies hort rn Terminal A Terminal B X short-turn option 1 short-turn option 2 Express train Blockage Held trains fter clearance after clearance KEY Train Station Nigel Wilson 1.258J/11.541J/ESD.226J Spring 2010, Lecture 25B 4
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- 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 eadways) headways) Key Characteristics: Instability of even headways Passenger sensitivity to long waiting time and crowding Cost insensitivity to different strategies Possible Strategies: Holding hort rning Short turning Expressing Nigel Wilson 1.258J/11.541J/ESD.226J Spring 2010, Lecture 25B 5
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Example of Transit Control Strategies Blockage Vehicle Stop T1' T3 T2 T1 T4 S2 S1 passengers/min 4 passengers/min 0 passengers/min 20 passengers/min
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This note was uploaded on 12/06/2011 for the course ESD 11.380j taught by Professor Fredsalvucci during the Fall '02 term at MIT.

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MIT1_258JS10_lec25 - Real-Time Control Strategies for Rail...

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