Abstract: The coordination and balance of astronauts′ motions during missions in space are different from those in the ground environment due to the microgravity environment. The characteristics of astronauts′ movement in microgravity environment were studied, the dynamics of astronaut attitude adjustment strategy was analyzed, and the human performance in the process of movement was evaluated. Specifically, in the absence of external force/moment actuation, the human body must rely on the limbs to achieve the active control of torso posture according to a certain coordinated motion strategy. On the other hand, in order to analyze the motion strategies, the dynamics principles of human wholebody movement process need to be studied. Firstly, the dynamics model of human multirigid body system was established based on NewtonEuler method, and secondly ,the closedloop control system based on MBDyn software and computational moment method was established, which can simulate and calculate the complex motion process of human body. Finally, using the above theory and system, the feasibility of the human body relying on the limbs to actively adjust the posture according to a certain motion strategy was verified, and the dynamics of each joint was obtained, which provides some theoretical support for the design of astronauts′ motion in the future mission.

Key words: astronauts, human dynamics model, posture adjustment strategy;performance analysis；multibody dynamics simulation