森 治

第31回アストロダイナミクスシンポジウム (2021年7月26-27日. オンライン開催)資料番号: SA6000167060レポート番号: ASTRO-2021-C008 The 31th Workshop on JAXA Astrodynamics and Flight Mechanics 2021 (July 26-27, 2021. Online Meeting)

第31回アストロダイナミクスシンポジウム (2021年7月26-27日. オンライン開催)資料番号: SA6000167074レポート番号: ASTRO-2021-C022 The 31th Workshop on JAXA Astrodynamics and Flight Mechanics 2021 (July 26-27, 2021. Online Meeting)

第31回アストロダイナミクスシンポジウム (2021年7月26-27日. オンライン開催)資料番号: SA6000167049レポート番号: ASTRO-2021-B023 The 31th Workshop on JAXA Astrodynamics and Flight Mechanics 2021 (July 26-27, 2021. Online Meeting)

This study experimentally investigated the cause and the scattering mechanism of the phenomenon in which a celestial surface object scattered by a thruster injection has a spacecraft direction component. The phenomenon was first observed by Hayabusa2 touchdown. One of the mechanisms by which objects on the surface of the asteroid are scattered toward the spacecraft is the making crater by the thruster injection. We investigated the trends in the direction and amount of scattering of surface objects by injecting thrusters into a sandbox created in a vacuum chamber.

© 2021, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved. A novel approach for shape control of membrane structures is presented. The shape control is accomplished by exciting a spinning membrane. The membrane forms a shape consisting of several vibration modes, depending on the input frequency, and the wave surface stands still when its frequency is synchronized with the spin; that is, the wave propagation and the spin cancel each other, resulting in a static wave surface in the inertial frame. This paper describes the general theory of the static wave-based shape control. The mathematical model of membrane vibration, classification of control input, and the control system for exciting a static wave are summarized. The proposed method is demonstrated through a ground experiment. A 1 m large polyimide film is rotated and is vibrated in a vacuum chamber, and the output shape is measured using a real-time depth sensor. The nonlinear dynamics of membrane deformation under both the ground and space environments is simulated using a numerical method, showing the validity and effectiveness of the shape control method.