Abstract
The sliding direction dependence of finger stick-slip significantly affects tactile perception. In this study, a balance model and a viscoelastic model were established to quantitatively describe the mechanism of this direction dependence. Parameters affecting the occurrence of stick-slip were analyzed, including the damping ratio ζ, tangential stiffness k, and the difference between static and sliding force ΔFf, etc. During experiments, the structure of phalanges caused larger ΔFf in distal direction than in proximal. This effect, together with the smaller k, caused the stronger stick-slip phenomena, which agreed well with the models. These findings could enhance the understanding of principles and mechanism of finger stick-slip and might provide guidance in better describing and modeling the tactile perception.
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