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Open AccessArticle

Development of a New Embedded Dynamometer for the Measurement of Forces and Torques at the Ski-Binding Interface

1
Sport Science Institute, University of Lausanne, CH-1015 Lausanne, Switzerland
2
Ecole Polytechnique Fédérale de Lausanne (EPFL), School of Engineering (STI), Mechanical Engineering Section, Station No. 9, CH-1015 Lausanne, Switzerland
3
University of Applied Sciences and Arts Western Switzerland (HES-SO), HEIG-VD, CH-1401 Yverdon-les-Bains, Switzerland
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(19), 4324; https://doi.org/10.3390/s19194324
Received: 12 August 2019 / Revised: 1 October 2019 / Accepted: 3 October 2019 / Published: 7 October 2019
(This article belongs to the Special Issue Sensors for Biomechanics Application)
In alpine skiing, understanding the interaction between skiers and snow is of primary importance for both injury prevention as well as performance analysis. Risk of injuries is directly linked to constraints undergone by the skier. A force platform placed as an interface between the ski and the skier should allow a better understanding of these constraints to be obtained to thereby develop a more reliable release system of binding. It should also provide useful information to allow for better physical condition training of athletes and non-professional skiers to reduce the risk of injury. Force and torque measurements also allow for a better understanding of the skiers’ technique (i.e., load evolution during turns, force distribution between left and right leg…). Therefore, the aim of this project was to develop a new embedded force platform that could be placed between the ski boot and the binding. First, the physical specifications of the dynamometer are listed as well as the measurement scope. Then, several iterations were performed on parametric 3D modeling and finite element analysis to obtain an optimal design. Two platforms were then machined and equipped with strain gauges. Finally, the calibration was performed on a dedicated test bench. The accuracy of the system was between 1.3 and 12.8% of the applied load. These results show a very good linearity of the system, which indicate a great outcome of the design. Field tests also highlighted the ease of use and reliability. This new dynamometer will allow skiers to wear their own equipment while measuring force and torque in real skiing conditions. View Full-Text
Keywords: alpine skiing; force platform; giant slalom; elite athletes; field testing alpine skiing; force platform; giant slalom; elite athletes; field testing
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MDPI and ACS Style

Meyer, F.; Prenleloup, A.; Schorderet, A. Development of a New Embedded Dynamometer for the Measurement of Forces and Torques at the Ski-Binding Interface. Sensors 2019, 19, 4324.

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