Experimental Method of Measuring Load Distribution under Edging Ski Plate

Kitazawa, Shunji; Kazama, Takeshi; Shimada, Takahisa; Omura, Takeo; Kobayashi, Mitsuyuki

doi:10.5997/sposun.11.63

Cited by 3 publications

(2 citation statements)

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“…Ski elasticity is measured more formally by tests defined in ISO standards [3]. The relationship between ski deflection and contact pressure was investigated by Sakata and Tagawa [6], Kitazawa et al [4] and Casolo and Lorenzi [1]. But in those studies, the skis were bent on non-snow surfaces such as rubber.…”

Section: Introductionmentioning

confidence: 99%

Ski deflection measurement during skiing and estimation of ski direction and edge angle

et al. 2008

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A new sensor for detecting ski bending and torsional deflection during an actual ski turn on the snow has been developed. It consisted of bending and torsion sensors connected by light rigid beams. This structure was fixed to the upper surface of a ski and passed through a tunnel in the central binding plate. The bending and torsion sensors were strain cells, designed to reject strain orthogonal to the desired measurement direction. The calibration factor for each sensor was determined in a jig, then the calibration of the overall sensor assembly was checked by static bending experiments and a free vibration test. A data logger recorded the strain signals synchronously with other data such as the components of the earth's magnetic field measured by a sensor on the ski. The data set allowed reconstruction in software of the instantaneous shape, direction and edge angle of the ski. The purpose of this paper is mainly to introduce the equipment used and methods developed. Tests of the sensor performance are described. Results from a ski run on snow are presented to show how the various types of data can be combined. A skilled ski athlete performed long turns with the ski at about 60 km/h on a groomed snow surface at Shiga Kogen in Japan. The experiment on snow showed that the deformation of the ski was predominantly bending; torsional deflection, although measurable, had only a small effect on the shape of the running edge. The ski edge adopted a symmetrical circular bent shape with an unexpectedly small radius when on the outside, but was unconstrained, lightly loaded and nearly straight when on the inside.

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Section: Introductionmentioning

confidence: 99%

Ski deflection measurement during skiing and estimation of ski direction and edge angle

et al. 2008

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“…Concerning ski deflection, the relationship between ski deflection and contact pressure was investigated by Sakata and Tagawa [1] on a rubber surface and by Kitazawa et al [2] and by Casolo and Lorenzi [3] on snow. Federolf [4] pressed a ski in the inclined direction into snow using a mechanical jig and measured the deformed shape under static conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of flexural stiffness distribution of a ski on the ski–snow contact pressure in a carved turn

et al. 2021

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The design of the flexural stiffness distribution of a ski is one of the important factors in its development. On the other hand, the ski-snow contact pressure during a turn is thought to be an important factor in a skier's feeling. However, the relationship between the flexural stiffness distribution and ski-snow contact pressure has not been made clear. The purpose of this study was to understand how flexural stiffness distribution affects the contacting pressure, applying load, and ski-snow contacting condition through measurement on these items. The measurement system consisted of a ski deflection sensor beam with bending sensors, pressure sensors installed near the ski edge, and four points of load cells connected between the binding plate and the ski. Measurements were performed on the different flexural stiffness distributions of Skis A and B on hard snow and soft snow surfaces. The peak of the flexural stiffness of Ski A was on the boot center, and Ski B was stiffer with a peak under the heel of the boot. An increase in the flexural stiffness under the heel of the boot for Ski B caused less deflection in the rear part of the ski, and the applied force from the binding plate shifted forward. By fitting the ski deflection on the snow groove, so the rear section of the ski after the pressure peak fitted on the sliding surface of the snow groove, the compression zone increased and the sliding zone was reduced in Ski B. The pressure peak in Ski A was under the boot center, whereas, for Ski B it was behind the boot center. These results show that changes in flexural stiffness distribution alter ski deflection and ski-snow contact pressure.

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Investigation on the ski-snow interaction in a carved turn based on the actual measurement

Yoneyama

Kitade

Osada³

2010

Procedia Engineering

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Experimental Method of Measuring Load Distribution under Edging Ski Plate

Cited by 3 publications

References 0 publications

Ski deflection measurement during skiing and estimation of ski direction and edge angle

Ski deflection measurement during skiing and estimation of ski direction and edge angle

Effect of flexural stiffness distribution of a ski on the ski–snow contact pressure in a carved turn

Investigation on the ski-snow interaction in a carved turn based on the actual measurement

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