A three-piece bogie acts as a support for the freight train car bodies so that they can run on straight and curved tracks. It also absorbs the vibrational energy generated by the track. The three main parts of a traditional three-piece bogie are two side frames and a bolster. The side frames run parallel to the rails and are connected to each other by the bolster, which runs perpendicular to the rail. The side frames are connected to the axles, which are directly connected to the wheels that run on the track through the primary suspension. The primary suspension includes the bearing adapter and pedestal roof. The secondary suspension, which includes the friction wedge and load coils, connects and provides damping on each end of the bolster at its intersection with the side frame. Moreover, the friction wedge aids in warp resistance of the bogie. Because of the wedge's non-linear frictional characteristics and load sensitive behaviour, accurately capturing its dynamics in a computational model proves difficult. Previous work focused on better capturing the dynamics of the friction wedge modelled as a 3 dimensional rigid body. The current study extends to a half-truck model treated as an application of multibody dynamics with unilateral contact to model the friction wedge interactions with the bolster and the side frame. The half-truck model is a 3 dimensional, dynamic, stand-alone model comprised of the four rigid bodies. It allows each wedge four degrees of freedom. The bolster and the side frame have only a vertical translation degree of freedom. The geometry of these bodies can be adjusted for various simulation scenarios.
Three-piece half-truck multibody dynamics models for freight train suspensions
2008
11 Seiten, 23 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
JRC2008-63055 Three-Piece Half-Truck Multibody Dynamics Models for Freight Train Suspensions
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