Abstract:This paper presents the development of a modular tool for the prediction of train braking performance. Particular attention is devoted to the accurate prediction of stopping distances, considering different loading and operating conditions, necessary to verify safety requirements prescribed by the European Technical Specifications for Interoperability of High Speed Trains (TSI-HS) and the corresponding EN regulations. Results are verified by considering, as a benchmark, the AnsaldoBreda EMU V250: a European tr… Show more
“…Braking deceleration take count of known limitations in terms of exploited wheel-rail adhesion that are defined by international standards concerning brake design. 28 Desired braking performance is then distributed between electric and pneumatic brake plants, maximizing the quote of regenerative braking to further recover energy and increase autonomy.Figure 3.(a) calculation of speed profile on a line section, b) calculated speed profiles for Firenze-Siena line.…”
Diesel multiple units (DMU) offer an affordable alternative to electric trains on lines in which infrastructural and maintenance costs of electrification are not justified. A further improvement of sustainability involves the abandonment of internal combustion engines in favour of an electric power train sustained by an on-board storage system. In this work, the authors propose a model to perform a rapid simulation of hybrid storage systems based on hydrogen fuel cells,a technology that should be complementary with respect to battery-operated trains. The proposed tool is applied, as a benchmark test case, to a modular passenger train devoted to regional service. Obtained results clearly demonstrate the capabilities of proposed tools and give useful indications for a feasible optimization and integration of fuel cells for railway applications.
“…Braking deceleration take count of known limitations in terms of exploited wheel-rail adhesion that are defined by international standards concerning brake design. 28 Desired braking performance is then distributed between electric and pneumatic brake plants, maximizing the quote of regenerative braking to further recover energy and increase autonomy.Figure 3.(a) calculation of speed profile on a line section, b) calculated speed profiles for Firenze-Siena line.…”
Diesel multiple units (DMU) offer an affordable alternative to electric trains on lines in which infrastructural and maintenance costs of electrification are not justified. A further improvement of sustainability involves the abandonment of internal combustion engines in favour of an electric power train sustained by an on-board storage system. In this work, the authors propose a model to perform a rapid simulation of hybrid storage systems based on hydrogen fuel cells,a technology that should be complementary with respect to battery-operated trains. The proposed tool is applied, as a benchmark test case, to a modular passenger train devoted to regional service. Obtained results clearly demonstrate the capabilities of proposed tools and give useful indications for a feasible optimization and integration of fuel cells for railway applications.
“…Subsystems have been modelled by lumped components connected to each other, as described in [11, 12]. Similar approaches can be found also in [13, 14]. The model, firstly developed to simulate conventional tramways, was validated also by experimental measurements effectively performed on existing tramways [15, 16].…”
Section: Comparison Between Conventional and Permanent Magnet (Pms)mentioning
An automated people mover (APM) is a system used in urban/suburban areas to transport passengers point to point with a high frequency and a reliable service. Although conventional wheel-on-rail/route systems are commonly used in APMs, the application of the magnetic levitation (MAGLEV) technology in this field sounds promising. Since this technology replaces the wheels by electromagnetic systems, there is no contact between the levitating vehicle and the guideway. This implies zero wear, reduced maintenance and virtually no noise and vibrations. Efficiency, lightweight and cheapness represent expected additional benefits. The aim of thisstudy is to show, through a theoretical analysis based on a real APM and on a simulated automated MAGLEV people mover (AMPM), how the low-speed MAGLEV applications can compete with conventional wheel/ rail technology. The levitation and guiding forces in a permanent magnets-based AMPM have been obtained by using an FEM code. Then, a simulation tool, based on Modelica language, has been developed to perform a comparison between a conventional APM and an AMPM, in terms of power and energy requirements engaged in urban routes. Finally, a brief preliminary estimation of costs for the major AMPM subsystems has been presented.
“…Subsystems have been modelled by lumped components connected to each other, as described in [23], [24]. Similar approaches are also found in literature [25], [26]. The model, firstly developed to simulate conventional tramways, has been modified to take into account the main features of the MUTS described in the previous paragraphs.…”
Section: Comparison Between Conventional and Maglev Urban Transpormentioning
The American version of Maglev (AMLEV) was developed in the USA since 1992. It is based on the interaction between a system of permanent magnets (PMs) installed on the vehicle, and steel cores positioned along the guideway. By using an analytical model, the inventor demonstrated that the system was able to produce levitating and stabilizing forces, allowing to safely reach a speed up to 150 m/s. In the present paper, the AMLEV technology is firstly simulated by using a FEM model; then its possible application in a low speed urban transportation system is verified. Finally, a comparison in terms of energy consumption and braking energy recovery efficiency is performed
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