B31 実飛行中のジャンプスキーの振動計測(スキー)

概要

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The purposes of this study were to develop the system for measuring the flexural vibration of a jump ski in actual ski flight and to measure and analyze the vibration using this system. To measure the flexural vibration of a jump ski in flight, two accelerometers were installed a ski. One was installed into the top of a ski, another was the tail of a ski. By means of accelerometers, vibrations of a ski were detected in actual ski flight. They were recorded to a data recorder and transferred to a computer, furthermore, transformed into the power spectrum by means of FFT. In experiment, an amplifier and a data recorder were inserted into a backpack wearing in a jump suit of a subject. The vibrations were analyzed in the following phases ; approach, take off, flight and landing. In approach, the natural vibration frequencies of a ski were not detected. The natural vibration frequencies were, however, detected immediately after take off. In flight, however, the natural frequencies were disappeared. Furthermore, in landing, the low frequency components between 40 and 70 [Hz] on the top of the ski were detected, because a jumper landed from the tail of ski. In addition, over 9800 [m/sec^2] of the acceleration amplitude at the top of a ski was detected.
2006-11-08