1P2-N02 小惑星探査ローバー用の環境温度駆動バイメタル座屈アクチュエータの特性評価(宇宙ロボット)

抄録

Asteroid probe Hayabusa 2 developed by JAXA will carry an asteroid exploration rover. The rover with hopping mechanism is developed by the consortium of universities. In our research project, we have proposed a basic model of buckling-type bimetal actuator driven by environmental temperature change on the asteroid surface. In this work, novel practical model of the buckling actuator using a small aluminum movable mass, in which a bimetal thin plate is attached for snap buckling motion, was fabricated. The bimetal actuator was successfully driven at about 65℃ and 49℃ in heating and cooling cycles, respectively. The actuator with a test mass hopped to a height of 25 mm by the buckling motion under 1G gravity condition, suggesting that the rover can hop to 1.6 m height at the asteroid surface. Deformation behavior of the bimetal actuator was evaluated in detail. It was plastically deformed at high temperature under clamping condition with large elastic deflection. However, there was no plastic affect at 80℃ under small elastic clamping condition.