Συντάχθηκε 06-12-2013 14:15
από Agapi Mavraki
Email συντάκτη: amavraki<στο>tuc.gr
Ενημερώθηκε:
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Ιδιότητα: ΕΤΕΠ ΜΠΔ.
Presentation of PhD Thesis
Mehdi Keyvan-Ekbatani
PhD Candidate
οf School of Production Engineering & Management (Μ.Π.Δ)
Title: Real-Time Urban Traffic Control under Saturated Conditions
Presentation: Common Meeting Room of Μ.Π.Δ (Aithousa Synedriaseon)
Date: Monday 16 December 2013 at 17:30
Committee members:
•Markos Papageorgiou, Professor, Μ.Π.Δ, TU Crete, Supervisor
•Ioannis Papamichail, Assistant Professor, Μ.Π.Δ, TU Crete
•Georgios Stavroulakis, Professor, Μ.Π.Δ, TU Crete
•Matthew Karlaftis, Associate Professor, Dep. of Civil Eng., National Technical Un. Athens
•Nikolas Geroliminis, Assistant Professor, Dep. of Civil Eng., EPFL
•Ioannis Nikolos, Assistant Professor, Μ.Π.Δ, TU Crete
•Argiris Delis, Associate Professor, Μ.Π.Δ, TU Crete
ABSTARCT
In recent decades, mitigating the traffic congestion in urban road networks has been a crucial issue for both the research and the practical operations, which calls for the development and implementation of improved traffic signal control methods and techniques. In particular, the development of efficient and practicable real-time signal control strategies under saturated traffic conditions is a major challenge.
A practical tool, frequently employed against over-saturation of significant or sensitive links, arterials or urban network parts, is gating. The idea is to hold traffic back (via prolonged red phases at traffic signals) upstream of the links to be protected from over-saturation, whereby the level or duration of gating may depend on real-time measurements from the protected links. The method is usually employed in an ad hoc way (based on engineering judgment and manual fine-tuning) regarding the specific gating policy and quantitative details, which may lead to insufficient or unnecessarily strong gating actions.
In this thesis, the recently developed notion of network fundamental diagram (NFD) for urban networks is exploited to improve mobility in saturated traffic conditions via application of gating measures, based on an appropriate simple feedback control structure. Different gating control strategies have been proposed and tested on realistic simulation scenarios of two urban networks (i.e. Chania, Greece and San Francisco, USA) successfully. The results show that the total delay in the network decreases significantly and the mean speed increases accordingly.
