Theoretical and experimental investigation of performance characteristics and design aspects of cross-spring pivots

Gonçalves Junior, Luis Antonio; Theska, René GND; Lepikson, Herman A.; Ribeiro Junior, Armando Sá; Linß, Sebastian GND; Gräser, Philipp

Cross-spring pivots have been widely employed over the last decades in a broad variety of precision engineering applications due to the high motion repeatability achieved thanks to the absence of stick slip and clearance. In this paper, the non-linear effect of the anticlastic curvature of the leaf-springs is considered for the accurate analytical modeling of the elasto-kinematic behavior of cross-spring pivots. Finite element analyses (FEA), based on a non-linear thin-shell model, are carried out in order to compare them with the analytical results for the main performance parameters of this type of device, i.e. center-shift, rotational stiffness and stress in the leaf-springs. Furthermore, an experimental setup is built to assess the applicability limits of both models. Finally, remarkable performance aspects of cross-spring pivots are discussed aiming for design improvements.

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Theoretical and experimental investigation of performance characteristics and design aspects of cross-spring pivots, 2020. . International journal of solids and structures 185/186, 2020, 240–256. https://doi.org/10.1016/j.ijsolstr.2019.08.023
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