Simulation method for determining traction power of ATN–PRT vehicle
The construction of Personal Rapid Transit (PRT) vehicle made within the framework of Eco-Mobility project has been described in the present paper. Key features of the vehicles were identified – e.g. drive with three-phase linear motor with winding on the vehicle and fixed rotor in the road surface, contactless dynamic vehicle powering. Attention was paid to the difference in dynamic properties compared to rail vehicles, related to the lack of the so-called ‘centering mechanism’. A development of a nominal model for the analysis of vehicle drive properties was presented. Results of simulation studies were presented for a vehicle with running-drive system construction, planned for implementation in the city of Rzeszów (Poland). While discussing the problems of building a PRT system, there was a focus on the issue of determining power and traction of the vehicle. A methodology for determining the power and traction energy consumption of the vehicle was presented for assumed conditions of travel on road segments. Input values for the calculation of power are variables describing the curvature (or bends radii) of paths of movement between stops and the course of the current speed. Output values are total traction power or traction energy (where ‘traction’ refers to the power or mechanical work of drive forces). Three basic elements of traction power were isolated: the power of kinetic energy (for acceleration/delay of vehicle movement) basic (to offset the aerodynamic force of motion resistance at constant speed) and additional losses (to offset additional motion resistance forces operating in turns at constant speed). Due to the lack of vehicle prototypes with assumed structure, it was proposed that these components are determined via simulation. The presented results relate to the calculation of demand for power and energy for the planned test section. The scope of further work was indicated: determining the required traction characteristics of electric drive, selecting the best values for supercapacitor’s capacity in the drive system, determining the technical parameters of substation.
Keyword : ATN–PRT (Automated Transit Network – Personal Rapid Transit), physical model in scale; electromechanical PRT drive dynamics model, computer simulation; traction power, PRT vehicle energy demand
Choromański, W.; Daszczuk, W.; Grabski, W.; Dyduch, J.; Maciejewski, M.; Brach, P. 2013a. Personal rapid transit (PRT) computer network simulation and analysis of flow capacity, in W. H. Leder, W. J. Sproule (Eds.). Automated People Movers and Transit Systems 2013: Half a Century of Automated Transit – Past, Present, and Future, 21–24 April 2013, Phoenix, Arizona, US, 296–312. http://doi.org/10.1061/9780784412862.022
Choromański, W.; Grabarek, I.; Kowara, J.; Kamiński, B. 2013b. Personal rapid transit – computer simulation results and general design principles, in W. H. Leder, W. J. Sproule (Eds.). Automated People Movers and Transit Systems 2013: Half a Century of Automated Transit – Past, Present, and Future, 21–24 April 2013, Phoenix, Arizona, US, 276–295. http://doi.org/10.1061/9780784412862.021
Choromański, W.; Kowara, J. 2013a. Personal rapid transit vehicle with polyurethane wheels – modelling and simulation issues, Archives of Transport 27–28(3–4): 71–79.
Choromański, W.; Kowara, J. 2013b. PRT – modeling and dynamic simulation of track and vehicle, in W. H. Leder, W. J. Sproule (Eds.). Automated People Movers and Transit Systems 2011: From People Movers to Fully Automated Urban Mass Transit, 22–25 May 2011, Paris, France, 294–306. http://doi.org/10.1061/41193(424)28
Daszczuk, W. B.; Choromański, W.; Mieścicki, J.; Grabski, W. 2015. Empty vehicles management as a method for reducing passenger waiting time in personal rapid transit networks, IET Intelligent Transport Systems 9(3): 231–239. http://doi.org/10.1049/iet-its.2013.0084
Eco-Mobilność. 2010. “Eco-Mobility” Project Implemented Under European Union Operation Programme Innovative Economy. Available from Internet: http://www.eco-mobilnosc.pw.edu.pl
Foster+Partners. 2007. Masdar Development. Project. Abu Dhabi, United Arab Emirates. Available from Internet: http://www.fosterandpartners.com/projects/masdar-development
Gustafsson, J.; Kang, J.; Englund, J.; Grimtell, P. 2011. Design Considerations for Capacity in PRT Networks, in W. H. Leder, W. J. Sproule (Eds.). Automated People Movers and Transit Systems 2011: From People Movers to Fully Automated Urban Mass Transit, 22–25 May 2011, Paris, France, 385–394. http://doi.org/10.1061/41193(424)35
Kamiński, B.; Nikoniuk, M.; Drązikowski, Ł. 2013. A concept of propulsion and power supply systems for PRT vehicles, Archives of Transport 27–28(3–4): 81–93.
Kozłowski, M.; Choromański, W.; Kowara, J. 2015a. Analysis of dynamic properties of the PRT vehicle-track system, Bulletin of the Polish Academy of Sciences Technical Sciences: the Journal of Polish Academy of Sciences 63(3): 799–806. http://doi.org/10.1515/bpasts-2015-0091
Kozłowski, M.; Choromański, W.; Kowara, J. 2015b. Parametric sensitivity analysis of ATN–PRT vehicle (automated transit network – personal rapid transit), Journal of Vibroengineering 17(3): 1436–1451.
Kozłowski, M.; Tomczuk, K.; Szczypior, J. 2011. Methodology of determining basic technical parameters of electric-drive car, Przegląd Elektrotechniczny (10): 299–304.
MacDonald, R. 2011. The future of high capacity PRT, in W. H. Leder, W. J. Sproule (Eds.). Automated People Movers and Transit Systems 2011: From People Movers to Fully Automated Urban Mass Transit, 22–25 May 2011, Paris, France, 250–262. http://doi.org/10.1061/41193(424)24
Mieścicki, J.; Daszczuk, W. 2013. Proposed benchmarks for PRT networks simulation, Archives of Transport 27–28(3–4): 123–133.
Podcar City. 2015. Podcar City Conferences: Innovative Mobility in the Era of Automation. Available from Internet: http://podcarcity.org
Posco. 2014. Korea’s First Personal Rapid Transit (PRT), SkyCube. Available from Internet: http://globalblog.posco.com/koreas-first-personal-rapid-transit-prt-skycube
SanJoseCA.gov. 2014. Automated Transit Network (ATN). SanJoseCA.gov – the City of San José’s public website. Available from Internet: http://www.sanjoseca.gov/index.aspx?NID=3706
Sparowitz, L.; Freytag, B.; Viet, T. N. 2013. Quickway – smart traffic for smart cities, in The 38th Conference on Our World in Concrete & Structures (OWICS 2013), 22–23 August 2013, Singapore, 1–12.
Swenson, R. 2011. Solar skyways, mobility in a world beyond oil, in Podcar City: Stockholm, 6–8 September 2011, Stockholm, Sweden, 1–41.
TNO Automotive. 2008. MF-Tyre/MF-Swift 6.1.1: Help Manual. Document Revision: 3-12-2008. Helmond, The Netherlands. 99 p.
Ultra Global. 2015. Ultra Global Ltd. Available from Internet: http://www.ultraglobalprt.com