B-31 Correlation between the Flight Posture and the Flight Distance in Ski Jumping through High Speed Video Image Analysis

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  • B-31 高速度ビデオカメラの画像解析によるスキージャンプの飛型と飛距離の相関(ウィンタースポーツ)
  • 高速度ビデオカメラの画像解析によるスキージャンプの飛型と飛距離の相関
  • コウソクド ビデオカメラ ノ ガゾウ カイセキ ニ ヨル スキージャンプ ノ ヒガタ ト ヒキョリ ノ ソウカン

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Abstract

Initial 40-m part of a flight of 120-m jumping after take-off was recorded by a fixed high-speed video camera at a frame rate of 250 frames/sec at Hakuba Ski Jumping Stadium in Japan. Aerodynamic forces were derived from the image data analysis of high-speed video image of ski jumping flight. The time variations of the forward leaning angle and the ski angle of attack were also taken from the video image. Based on these time variation data, we defined the time of the transition to the quasi-steady flight, which may be equivalent to the time for the completion of the initial take-off motion. Some correlations were investigated between the jumping distance and those key angles and the initial transition time. It is found these key data are appropriate measures for the jumping skill.

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