Active Primary Spring for the Next Generation Train
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In this paper the design of an active primary spring for a single-wheel single running-gear railroad carriage is
discussed. The setup is based on a leaf-spring design, which is implemented as fibre-composite part, combined
with piezo-ceramic stack-actuators, enabling to dynamically influence the contact between wheel and rail. The
motivation of the design as active component is discussed and the process of dimensioning of the leaf-spring is
introduced. Final dimensions and active properties of the primary springs are given and discussed. An approach
to a control scheme for first tests is presented as well as results from first dynamic tests with a downscaled
prototype.
The paper closes with the outlook on tests and simulations which elucidate the integration into the concept of
the mechatronic running gear.