Research Term: FY2000 - 2002 Research Fields: Space Utilization Technology Development Research Categories: Phase IB Research Research Theme: Study on Elements of Hybrid Actuator System for Vibration Isolation and Steering Control

Summary Objectives/Significance Many experiments and observations in space have been conducted with satellites. Dynamic disturbances to mission payload were individually studied and controlled suitably. The Japanese Experiment Module Exposed Facility (JEM-EF) attached to the International Space Station (ISS) is strongly expected as a field for performing various space experiments and observations by utilizing space environment characteristics, such as micro-gravity and opened wide Field Of View (FOV). However, the ISS/JEM-EF has many internal disturbance sources, i.e., moving parts or crew activities, and a large tilt of the attitude. These severely affect to conduct experiment. The purpose of the study is elemental technologies to provide the quieter environment in the JEM-EF similar to previous satellites. As results of our study, these technologies will contribute to establish the system that provides vibration isolation and steering functions simultaneously and provide more effective observation/experiment conditions to the JEM-EF payloads. Methods It will be required that the system can satisfy many of various requirements from the JEM-EF experimental users and demonstrate the specified performance under the unique JEM-EF environment conditions. We have carried out elemental technologies study, as follows: z We examined the preliminary mission requirements of the system by means of studying previous and/or planning satellites missions. Using these results, we estimate the system design target. z The system must provide vibration and steering controls in low-frequency domain, and passive vibration isolation in high-frequency domain. In order to obtain dynamic