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Estrada M.,Polytechnic University of Catalonia | Mension J.,Transports Metropolitans de Barcelona TMB | Aymami J.M.,University of Barcelona | Torres L.,University of Barcelona
Transportation Research Part C: Emerging Technologies | Year: 2016

This paper proposes a new dynamic bus control strategy aimed at reducing the negative effects of time-headway variations on route performance, based on real-time bus tracking data at stops. In routes with high demand, any delay of a single vehicle ends up causing an unstable motion of buses and producing the bus bunching phenomena. This strategy controls the cruising speed of buses and considers the extension of the green phase of traffic lights at intersections, when a bus is significantly delayed. The performance of this strategy will be compared to the current static operation technique based on the provision of slack times at holding points. An operational model is presented in order to estimate the effects of each controlling strategy, taking into account the vehicle capacity constraint. Control strategies are assessed in terms of passenger total travel time, operating cost as well as on the coefficient of headway variation. The effects of controlling strategies are tested in an idealized bus route under different operational settings and in the bus route of highest demand in Barcelona by simulation. The results show that the proposed dynamic controlling strategy reduces total system cost (user and agency) by 15–40% as well as the coefficient of headway variation 53–78% regarding the uncontrolled case, providing a bus performance similar to the expected when time disturbance is not presented. © 2016

Fuertes A.,University of Barcelona | Casals M.,University of Barcelona | Gangolells M.,University of Barcelona | Puigdollers O.,Transports Metropolitans de Barcelona TMB
eWork and eBusiness in Architecture, Engineering and Construction - Proceedings of the European Conference on Product and Process Modelling 2012, ECPPM 2012 | Year: 2012

Usually accounting for the biggest infrastructure facilities in a city, underground transportation systems consume huge amount of energy, besides their contribution to the reduction of carbon emissions. It is required for both driving the trains and operating stations and tunnel equipment. In particular, one third of the energy consumed by the railway system is required for operating the subsystems of metro stations, such as ventilation, vertical transportation and lighting. Despite the potential improvement of energy efficiency, only a few approaches concerning the relation between the operation of underground stations and their energy consumption are currently available. This paper is aimed at presenting an innovative methodological and technological framework, based on energy metering and sensor-actuator networks, to support the optimal energetic control and operation of underground railway stations and the midterm energy efficiency planning.With the implementation of the proactive energy control system developed within the SEAM4US European project, a 5 per cent saving in non-traction electricity consumption is expected in one year, which is equivalent to the electricity consumed in a year in more than 1000 households. © 2012 Taylor & Francis Group.

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