Vol. 2, 2017

Original research papers

Other topics

THE OPTIMISING FORCE BALANCE EXERCISED IN THE WHEEL – PROFILE CONTACT FORCE DURING THE CURVED PATH. AN EXPERIMENTAL APPROACH OF USING CURVILINEAR PROFILES

Koci Doraci, Alfred Hasanaj

Pages: 300-303

DOI: 10.21175/RadProc.2017.60

This paper’s objective is to contribute to the optimization of the problem of guiding forces during the movement of a railway vehicle. The paper proposes an innovative solution as compared to classical authors’ suggestions, which are limited to a small number of alternatives. The methodology follows an experimental approach. A two-stage experiment is performed where experimental conditions are modeled after profiles designed following a curved path with a radius of 500 m (by definition classified as tight curve). Standard profiles were used in the first experimental stage used, while curvilinear profiles were exploited the second experimental stage. After the experiment was conducted, data concerning (1) displacement (2) moments of force and (3) guiding forces of wheel-rail contact were analyzed and compared for both stages: both standard profiles and curvilinear profiles. After considering the experimental results, the major conclusions of the paper are: (1) in the case of curvilinear profiles, small movements of the vehicle lead to a change in the size of the wheel displacement smaller than the corresponding change in standard profiles; (2) moments of force are greater in the case of standard profiles compared to curvilinear ones; and (3) curvilinear profiles enable movement without many contact points with the wheel, friction forces exert their action in longitudinal direction, thus causing a smaller value of guiding forces.
  1. Railway applications – Testing and Simulation for the acceptance of running characteristics of railway vehicles – Running Behaviour and stationary tests, EN 14363, Oct. 15, 2015.
    Retrieved from: https://shop.austrian-standards.at/Preview.action;jsessionid=85F8BFFD9F79497A3EC8CC846B181177?preview=&dokkey=583227&selectedLocale=en
    Retrieved on: Dec. 15, 2016
  2. Testing and approval of railway vehicles from the point of view of their dynamic behavior – Safety – Track fatigue – Ride quality, 3rd ed., International Union of Railways, Paris, France, 2005.
    Retrieved from: http://xa.yimg.com/kq/groups/22520649/1117459065/name/uic
    Retrieved on: Dec. 15, 2016
  3. S. Kalay, R. P. Reiff, R. Smith, M. Scholl, “Control of Wheel/Rail friction,” National Research Council, Washington (DC), USA, Rep, 71b, 2002.
    Retrieved from: http://onlinepubs.trb.org/onlinepubs/tcrp/tcrp_rpt_71b.pdf
    Retrieved on: Dec. 15, 2016
  4. P. Dupont, “Testing the dynamic behavior of vehicles: Normalisation of test conditions by use of multi linear regressions,” in Proc. WCRR 2011, Lille, France, 2011.
    Retrieved from: http://www.railway-research.org/IMG/pdf/g8_dupont_patrick.pdf
    Retrieved on: Dec. 15, 2016
  5. J. Wang, S. Chen, X. Li, Y. Wu, “Optimal rail profile design for a curved segment of a heavy haul railway using a response surface approach,” Proc. Inst. Mech. Eng. Part F: J. Rail and Rapid Transit, vol. 230, no. 6, pp. 1496 – 1508, Aug. 2016.
    DOI: 10.1177/0954409715602513
  6. W. Zhai, J. Gao, P. Liu, K. Wang, “Reducing rail side wear on heavy-haul railway curves based on wheel-rail dynamic interaction,” Int. J. Vehicle Mech. Mobility, vol. 52, no. suppl. 1, pp. 440 – 454, May 2014.
    DOI: 10.1080/00423114.2014.906633
  7. L. J. Wilson, “Performance measurements of rail curve lubricants,” Ph.D. dissertation, School of Engineering Systems Queensland University of Technology, QUT, Brisbane, Australia, 2006.
    Retrieved from: https://eprints.qut.edu.au/16344/1/Lance_Wilson_Thesis.pdf
    Retrieved on: Dec. 15, 2016
  8. S. Fukagai, T. Ban et al., “Development of Friction Moderating Systems to Improve Wheel/Rail Interface in Sharp Curves,” in Proc. WCRR 2008, Seoul, Korea, 2008.
    Retrieved from: http://uic.org/cdrom/2008/11_wcrr2008/pdf/S.2.2.4.2.pdf
    Retrieved on: Dec. 15, 2016