Experiments on snow resistance forces for a simulation of a turning ski
| Project/Area Number |
08650303
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Dynamics/Control
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| Research Institution | Niigata College of Technology |
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Principal Investigator |
TADA Noritaka Niigata College of Technology, Associate professor, 生産システム工学科, 助教授 (10236531)
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| Co-Investigator(Kenkyū-buntansha) |
HIRANO Yoichi Chuo Univ., Dept.of Industrial and Systems Engineering, Prof., 理工学部, 教授 (40013669)
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| Project Period (FY) |
1996 – 1997
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| Project Status |
Completed (Fiscal Year 1997)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Sport engineering / Ski / Cutting / Ice / Cutting force / Snow resistance force / 切削抵抗 / 雪面抵抗 |
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| Research Abstract |
While downhill snow skiing, alpine skiers enjoy using their skis to make turning motions that are mainly induced by skidding. Such turning motion when skidding is made possible by centripetal forces acting on the ski and skier dynamic motion systems ; being resistance forces which arise due to the skier placing the ski's longitudinal axis at an angle inclined away from the velocity vector and simultaneously edging the ski into the snow. In soft snow, an "edged" ski produces a snow impacting force ; whereas in hard snow, a cutting force is produced. Here, we experimentally investigate a cutting resistance force in the following way. An ice specimen is moved by a motor across a cutting tool simulating a ski. The plate-like cutting tool is attached to a rigid base, with the cutting force being measured by a tool dynamometer. An edging abgle and attack angle of 30ﾟ, 45ﾟ, and 90ﾟare respectively considered, being set when attaching the cutting tool to the apparatus. The following conclusions are obtained based on ice cutting force experiments.
1)Ice cutting forces are larger for deeper cutting depths.
2)The longitudinal component of cutting force does not depend on the attack angle of the ski.
3)Vertical and transverse components increase as the attack angle decreases.
4)The transverse component can be obtained when the attack angle is less than 90ﾟ.
5)Cutting forces are larger for smaller edging angles.
6)Empiriical cutting force equations are obtained by multiple regression analysis.
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Report
(3 results)
Research Products
(5 results)
