Center for Frontier Astronautics


Advanced Intelligence Research Center: Intelligent Satellite Systems Research
Development and demonstration of multi-modal simulation technology for digitalization of
pacecraft design and autonomy

This focuses on the development and demonstration of multi-modal simulation technology for autonomous spacecraft Multi-modal simulation technology such as structure, multibody dynamics, heat transfer, orbit, electric power, propulsion system, etc. is necessary for realizing autonomy, but it is still a challenge to develop a “real time” state estimation model (reduced order model, ROM) for multi-modal system. The goal of this study is to develop reduced order model for multi-modal simulation technology and demonstrate in small satellites. Activities for the development of simulation tools have already been conducted in Nakasuka Lab. for NSPO satellite, and JAXA/R&D/3U(JEDI) MCD team. First step in this topic is to share those activities with each other to understand current status of satellite simulation tools. In this study, thermal simulation is selected here for the study of ROM. Due to the stiffness of the heat conduction equations, there is a need for ROM. High-fidelity thermal simulation for spacecraft is available using ISV, and JAXA’s in-house program, so available assets are in place for ROM development. Simulation of electric power is a candidate as a multi-modal system.
It is considered that quantification of uncertainty and computational accuracy and speed is an important item for ROM, if it is utilized for the autonomous techniques, such as health management. Therefore, it is necessary to study the technique to quantitatively evaluate the uncertainty of data-driven ROM, model-based ROM, and those hybrid ROM.
This study also links to the multi-modal simulation technology for the digitalization of satellite design Digitalization of satellite design is a necessary technology to enhance international competitiveness. Study on digitalization is becoming active in JAXA. Depending on the design life cycle (conceptual design, detailed design), fidelity and computational cost required for the simulation differ. We should determine which phase of design life cycle will be focused on.
・ For the development of ROM reproducing the features of the multimodal system, the
   novel methodology integrating domain-driven and data-driven approaches is studied.
・ For the development of the autonomous spacecraft in JAXA, the ROM with affordable
   precision and computational cost is developed.
・ Building a digital twin representing actual conditions associated with a physical pacecraft
・ Uncertainty quantification study