Abstract
The air spring of bolsterless bogie trucks, which railway vehicles employ widely in recent years, has to distort large when the vehicles pass through sharp curves existing in such lines as subway, and this can deteriorate the durability of air springs. Besides, the bolsterless truck tends to increase the wheel lateral force on sharp curves the radii of which are 100m or less. This paper deals with the application of link-type forced steering mechanism toward bogie trucks with bolster for a counter-measure against the above-mentioned situation. Numerical simulation is carried out by using SIMPACK, which is the MBS including a module specialized for railway systems. As a result, under the condition of lowered longitudinal stiffness in the primary suspension, the bolster truck applied with the link-type steering mechanism shows the potential to suppress the wheel lateral force occurred on the sharp curves. Here, the deteriorated running stability due to the application of the steering mechanism can recover by adding moderate lateral damping in the secondary suspension. In addition, the analyzed wear index shows that the forced steering truck can decrease the flange wear resulting from passing through sharp curves.
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