Study on Vibration Control by Parametric Excitation for Sampling in Lunar Cave

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  • 月面洞窟内のサンプル採取を目指したパラメータ励振による振動制御に関する研究

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<p>Lunar cave is appropriate to making the moon base because the cave has high tightness, constant temperature, and safety from meteorite and radiation. The sampling in lunar cave is necessary to understand inside so there are many approaches studied. However, there is few studies about the approach method of sampling from the ceiling of vertical hole. This paper presents a sample acquisition method from the ceiling of vertical hole. The master unit throw the handset from the outside of the vertical hole, control the handset vibration by just pulling the wire, and get the sample by colliding the handset with the ceiling. We validated to control the handset with parametric excitation theory from the experiment. As a result, the average error rate of the maximum deflection angle was 30.9%, and the average error rate of the time to reach the maximum deflection angle was 1.88%. We concluded that the winding timing of the wire is mostly consistent with the theoretical value.</p>

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