Running resistance - results and analysis of full-scale tests with passenger and freight trains in Sweden

Abstract

This paper presents experimental results of running resistance tests. Running resistance is determined for conventional passenger trains, freight trains, and the X2 high-speed train. The influence of variables such as speed, number of axles, number of coaches, axle load, track type, and train length is studied. The running resistance is expressed in a general form by a second degree polynomial. The three terms in the polynomial are functions of these variables. The magnitude of the first termis speed independent and varies with number of axles, axle load, and type of track. The second term varies with speed and train length. No influence of axle load is distinguished. The third term is related to the air drag and varies with the speed squared and train configuration. It can be divided into two parts. One part is constant and depends upon the front and rear of the train, and another part increases approximately linearly with train length.

Keywords

running resistance resistance coefficient air drag rolling resistance coasting energy method full-scale tests axle load train length

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References

Muhlenberg. Resistance of a freight train to forward motion, vol I. Methodology and evaluation. Mitre Corp., Metrek Division, Report no FRA/ORD-78/04.I, National Technical Information Service, Springfield, 1978.

Davis

W. J.

The tractive resistance of electric locomotives and cars

Gen. Electr. Rev., 1926, 29, 2–24.

Rochard

B. P.

Schmid

A Review of methods to measure and calculate train resistances

Proc. Instn Mech. Engrs, Part F: J. Rail and Rapid Transit, 2000, 214, 185–199.

Hara

Ohkushi

Nishimura

Aerodynamic drag of trains

Q. Rep. RTRI, 1967, 8 (4), 226–229.

Guiheu

Resistance to forward movement of TGV-PSE trainsets: Evaluation of studies and results of measurements

French Railw. Rev., 1983, 1 (1), 13–26.

Peters

J.-L.

Optimising aerodynamics to raise IC performance

Railw. Gaz. Int., 1982, 817–819.

Gawthorpe

R. G.

Train drag reduction from simple design changes

Int. J. Veh. Des., Technological Advances in Vehicle Design Series, SP3, Impact of Aerodynamics Vehicle Design, 1983, 342–353.

Peters

J.-L.

Measurement of the influence of tunnel length on the tunnel drag of the ICE/V train. Aerodynamics and ventilation of vehicle tunnels, 1991, pp. 739–756 (Elsevier Science Publishers Ltd, UK).

Lukaszewicz

Andersson

Running resistance of Swedish passenger trains - measurements, methodology and results (in Swedish), Division of Railway Technology, Department of Vehicle Engineering, KTH, Stockholm, 1992. ISSRN KTH/FPT/AR 65 SE, TRITA-FPT, ISSN 0280–1078.

10.

Lukaszewicz

Running resistance of X2 in higher speed (in Swedish). Technical report, Division of Railway Technology, Department of Vehicle Engineering, KTH, Stockholm, 1993.

11.

Report ERRI C 179/RP 9.

Resume of test methods to determine the aerodynamic drag of a train in the open air, Utrecht, April 1993.

12.

Report ERRI A 168.2/RP 8.

Line tests with a view to reducing the aerodynamic drag of freight vehicles, Utrecht, 1992.

13.

Lukaszewicz

Energy consumption and running time for trains. Division of Railway Technology, Department of Vehicle Engineering, KTH, Stockholm, 2001, TRITA-FKT 2001:25. ISSN 1103–470X, ISRN KTH/FKT/D-01/25-SE.

14.

Lukaszewicz

Running resistance of passenger and freight trains. Methodology and test results. Division of Railway Technology, Department of Vehicle Engineering, KTH, Stockholm, 1995, TRITA-FKT report 1995:16, ISSN 1103–470X.

15.

Track data provided by Swedish National Rail Administration, Banverket.

16.

Changsen

Analysis of rolling element bearings, 1991 (Mechanical Engineering Publications Ltd, Bury St Edmunds and London).

17.

SKF. Product catalogue (in Swedish), SKF Huvudkatalog, 2006.

18.

Scibor-Rylski

A. J.

Road vehicle aerodynamics, 1984 (Pentech Press, London) (ISBN 0–7273-1805–5).

19.

Hammit

Aerodynamic forces on freight trains, vol. I, Report no FRA/ORD-76–295.I, National Technical Information Service, Springfield, 1976.

20.

Andersson

Berg

Railway systems and rail vehicles (in Swedish), Division of Rail Vehicles, Department of Aeronautical and Vehicle Engineering, KTH, Stockholm, 2003.