Paul Wiersma, Marion Linders, Arjen Zoeteman, Willem van Ravenswaay
Rolling Stock Design
International Heavy Haul
Year: February 2015
Location: Perth, Australia
frequency selective stiffness, RCF, track friendliness, wear
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In this paper the results are presented of an investigation into the optimisation of wheelset yaw rotation rigidity in trains, more specifically the wheelset guiding by the radial arm bush. The selected approach modifies the suspension design between the wheelset and bogie frame by introduction of frequency-dependency. This paper addresses the potential of this design change to reduce wear and tear at the wheel-rail interface, thus enhancing the so-called ‘track-friendliness’ of trains.
The evaluated train is of the Dutch EMU double stock type. Assessment of vehicle running behaviour was carried out by means of vehicle-track simulations within the VAMPIRE multibody simulation software. At the wheel-rail interface, the impact of the suspension design modification is quantified in relation to wear and rolling contact fatigue (RCF) damage of the rail, vehicle stability and the passenger ride quality. The research has shown that for the concerned vehicle type, RCF damage and wear can be reduced significantly, thereby increasing expected maintenance intervals and wheel and rail life. Results further demonstrated vehicle stability not to be influenced negatively. A dynamic stiffness limit value has been established for the assessed train type; above this limit value, vehicle stability is ensured. Lifetime calculations of a selected suspension component were carried out based upon a load collective derived from vehicle-track simulations. This showed the expected component lifetime to comply with the operational interval for bogie overhaul.