26S スキージャンプ飛翔における前傾角の最適化

概要

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The objective of this study is to reveal the optimum condition that makes the longest flight distance for the flight phase of ski jumping. In other words, the question is how a jumper should control their posture such as the body-ski angle from time to time to achieve the longest flight distance. In order to do that, we solve the fully optimization problem taking account of the equation of motion on the basis of aerodynamic data. Aerodynamic data are acquired for a wide variety of the angle of attack (0≤α≤50°) and body-ski angle (0≤θ≤40°) with a full size model of a ski jumper mounted in the 3-meter low speed wind tunnel. The body-ski angle is taken as a control parameter for the maximum flight distance. The result is summarized as follows. In order to reach the maximum flight distance, a jumper should satisfy some initial windows. The body-horizontal angle and forward initial angular velocity are around 25° and -25°/s for successful jump, respectively. A jumper should keep their deep body-ski angle, that is about 10°during the whole flight. A jumper should keep the drag small in the 1st half of the free flight and the lift large in the 2nd half. The flight distance is more sensitive for the forward initial angular velocity than the body-horizontal angle.
社団法人日本機械学会の論文
2000-11-08