U.P.B. Sci. Bull., Series D, Vol. 75, Iss. 4, 2013 ISSN 1454-2358 EXPERIMENTAL STUDY ON DETERMINATION OF AERODYNAMIC RESISTANCE TO PROGRESS FOR ELECTRIC LOCOMOTIVE LE 060 EA1 OF 5100 KW Ioan SEBEŞAN 1 , Sorin ARSENE 2 , Corneliu STOICA 3 This paper aims at making a comparative analysis regarding the influence of aerodynamic resistance to progress of electric locomotive LE 060 EA1 of 5100 kW for a range of situations encountered in exploitation. In this paper, experimental results are presented following a geometric modeling at 1:12 scale on a modular layout of the locomotive. Tests were made in the INCAS (National Institute of Research - Development Aerospace “Elie Carafoli”) in the subsonic wind tunnel. Keywords: aerodynamic, electric locomotive, experimental modeling 1. Introduction The resistance to progress growth leads to increasing the necessary traction force. If the tractive force of the locomotive exceeds the limit of adhesion it can produce slippage of axles and there is danger of the stick-slip phenomenon, which has harmful effects on both the performance of locomotive traction as well as the requests from the drive system axles, [1], [2], [3]. General form of resistance to progress of railway vehicles, known as Davis' relationship [3], [4], [5], [6], [7]” 2 v c v b a R t ⋅ + ⋅ + = (1) where: t R – total resistance to progress of the train; a – mechanical resistances at rolling caused by axle loads; v b ⋅ – the resistances at non aerodynamic advancing; 2 v c ⋅ – the resistances at aerodynamic advancing ; v – speed of the vehicle. 1 Prof., Depart Rolling Stock Railway, Transport Faculty, University POLITEHNICA of Bucharest, Romania, e-mail: ioan.sebesan@yahoo.com 2 Assist., Depart Rolling Stock Railway, Transport Faculty, University POLITEHNICA of Bucharest, Romania, România, e-mail: sorinarsene@gmail.com 3 Eng., National Institute of Research - Development Aerospace "Elie Carafoli", România, e-mail: cstoica@incas.ro