Abstract: An algorithm based on taking into account the torque ratio is proposed for simulating the extravehicular activity. The algorithm, which integrates inverse kinematics, inverse dynamics and human ergonomics information, avoids the collision between the human position and strength produced only using the dynamics or kinematics. It enhances the accuracy and reasonability of simulation. The simulation result can provide some guidelines for the design of extravehicular activity and ground training of astronauts.

Key words: extravehicular activity, simulation, optimization, torque ratio, astronaut