Experimental measurement of the ski boot stiffness in sagittal and frontal planes

Stefano Rossi, Paolo Cappa, Fabrizio Patanè

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In the present paper a novel device and a post-processing procedure are proposed to evaluate the mechanical behavior of a ski boot stiffness. The originality of the methodology consists in the following elements: (1) the stiffness is evaluated not only in plantar/dorsi flexion direction, but also in inversion/eversion one; (2) the loads are applied automatically and along programmable paths; and (3) the stiffness is calculated as the full jacobian of the applied moments. The testing apparatus is a XY Cartesian robot equipped with two linear potentiometers, a 6-axes load cell and a cardanic/prismatic joint for resembling the behavior of the knee complex. The experiments consisted of a cyclic horizontal displacement applied to the knee, with a period of 1 s in variable directions, and the measurement of the consequent boot reaction force. The chosen directions of load were straight lines passing through the neutral position of the boot; the lines changed their angle in respect to the ski when three displacement cycles were completed. The range of variation of flexion and inversion angles were 7° and 5°, respectively. The device showed a high level of repeatability, in comparison with the level of accuracy typical for the biomechanical evaluations, that permitted estimation of the stiffness of the tested boot as a 3rd order polynomial. The results achieved could be useful for the estimation of the reaction forces corresponding to ankle joint angles measurable during the skiing.

Original languageEnglish
Title of host publicationASME International Mechanical Engineering Congress and Exposition, Proceedings
Pages183-186
Number of pages4
Volume2
DOIs
Publication statusPublished - 2009
Event2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008 - Boston, MA, United States
Duration: Oct 31 2008Nov 6 2008

Other

Other2008 ASME International Mechanical Engineering Congress and Exposition, IMECE 2008
CountryUnited States
CityBoston, MA
Period10/31/0811/6/08

ASJC Scopus subject areas

  • Mechanical Engineering

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  • Cite this

    Rossi, S., Cappa, P., & Patanè, F. (2009). Experimental measurement of the ski boot stiffness in sagittal and frontal planes. In ASME International Mechanical Engineering Congress and Exposition, Proceedings (Vol. 2, pp. 183-186) https://doi.org/10.1115/IMECE2008-68774