Simulation of human body motion under the condition of weightlessness

Astronauts´ patterns of work under the condition of weightlessness and their adaptability thereto are important topics of space research in the field of manned space flight technology. In space, astronauts experience weightlessness, which is a very different condition from that experienced on the earth´s surface, and space flight tasks are performed at nearly 0 G. In this report, we describe the application of MATLAB Simulink and SimMechanics to the simulation and calculation of motion in weightlessness. The simulation results and the theoretical analysis are compared to prove that the centroid of the whole human body remains unchanged in the free motion state in space. This model can be applied to various computations of human motion under the condition of weightlessness. It can generate reference data for research into fields such as human space flight and space medicine. Furthermore, with certain modifications, it can be used to simulate and calculate human motion under normal as well as excessive gravity.