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ID 18286
file
title alternative
Biomechanical study on the postural control of ski-jumping : Focused on the second half of the flight phase
creator
Mizusaki, Kazuyoshi
subject
スキージャンプ
姿勢制御
3次元画像解析
風洞実験
Ski-jumping
Postural control
3-D motion analysis
Wind tunnel experiment
NDC
Sports and physical training
abstract
The goal of the flight phase in ski jumping is to get the best posture to maximize the flight distance. We focused on the second half of flight for discussing the relationship between the kinematical data from the field study and the aerodynamic data from the wind tunnel experiment. The two jumpers were selected, F.K. and A.S. in FIS Grand Prix (2000/8/26, Hakuba). Using the pan & tilt video system for 3-D motion analysis (PEAK Co.Ltd.), we filmed the posture in the second half of flight (from 64% flight to landing). The variables of attack angle (α), shank-ski angle (θ), trunk-thigh angle (σ) and ski-ski angle (λ) were measured. A full size ski-jumper model was mounted in the 3m low speed wind tunnel with the wind speed of 20 or 25 m/s. The lift, the drag and the pitching moment were measured. In this study, differences of motion in the same V jumping techniques were demonstrated between the two jumpers. The both jumpers changed the flight position 0.6s before landing. The average angles from the flight position to 0.6s before landing were shown as follows: F.K.; α=35.3°, θ=28.1°, σ=14.0°, λ=26.0°. A.S.; α=34.3°, θ=27.6°, σ=16.9°, λ=21.0°. From these results, σ was set as 14.0° and θ was set as 28.1°. When λ was 38.0°, the polar curve reached to the maximum. When increasing λ, the pitching moment decreased. Therefore it was reported that the best ski-ski angle was 38°. The more opened ski-ski angle should be recommended to these two jumpers for getting the better flight, still the nose down pitching moment will effect negatively to jumpers.
journal title
Bulletin of the Graduate School of Education, Hiroshima University. Part. II, Arts and science education
issue
Issue 53
start page
343
end page
351
date of issued
2005-03-28
publisher
広島大学大学院教育学研究科
国立情報学研究所
issn
1346-5546
ncid
SelfDOI
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Education
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